Watching the Skies » NWS Statement

Preliminary rainfall totals from 9/18/11

Sean Toner — Mon, 19 Sep 2011 22:12:04 +0000

Here are some preliminary rainfall totals from the afternoon and evening storms we had Sunday 9/18/11. Nowhere near enough to break or even dent the drought, but still it is a good start. First, I attached radar estimated rainfall.

Radar estimated precipitation for all of north Texas.

Zoomed inview for the immediate D/FW Metroplex.

Location                              rainfall /inches/
==============================
=========================
cvlt2    Centerville                          3.25
avat2    Avalon #2 larc                       2.79
csat2    Corsicana                            2.40
llmt2    lake Limestone Marin                 2.38

Dckt2    Dallas alert 307                     2.33
mypt2    Maypearl                             2.18
dwct2    Dallas alert 205                     2.13
act      Waco ASOS                            2.13

Aqlt2    Aquilla                              2.06
waxt2    Waxahachie                           2.00
rcet2    Rice                                 2.00
ddct2    Dallas alert 485                     1.92

Subt2    Sulphur Bluff                        1.89
dwht2    desert water coop#2                  1.88
aqut2    Aquilla 1sse                         1.87
crs      Corsicana ASOS                       1.81

Ddkt2    Dallas alert 171                     1.77
dbjt2    Dallas alert 175                     1.74
dwht2    desert water coop#2                  1.71
ddjt2    Dallas alert 165                     1.69

Ddmt2    Dallas alert 504                     1.66
gect2    Goldthwaite                          1.61
grst2    Groesbeck                            1.58
pwg      McGregor municpal ap                 1.55

Dddt2    Dallas alert 635                     1.54
dadt2    Dallas alert 255                     1.50
dabt2    Dallas alert 415                     1.50
mbkt2    Mabank 4sw                           1.47

Mrlt2    Marlin 3ne                           1.45
rprt2    Round Prairie RAWS                   1.41
dcrt2    Dallas alert 613                     1.41
tki      McKinney ASOS                        1.36

Llst2    lake Limestone                       1.36
dalt2    Dallas                               1.36
ddit2    Dallas alert 129                     1.33
mckt2    McKinney                             1.29

Dayt2    Dallas alert 305                     1.26
alat2    Aquilla lake                         1.26
kaft2    Kaufman                              1.23
ddlt2    Dallas alert 377                     1.23

Dbgt2    Dallas alert 623                     1.22
damt2    Dallas alert 453                     1.22
gelt2    Greenville RAWS                      1.18
cwft2    Crawford                             1.17

Chit2    Cedar Hill 4ne                       1.17
bvwt2    Blue Ridge                           1.17
aqat2    Aquilla creek blw da                 1.16
actt2    Waco Lake                            1.16

Dcxt2    Dallas alert 413                     1.14
dbst2    Dallas alert 253                     1.14
mcgt2    McGregor                             1.13
fest2    Freestone 5sw                        1.10

Dcet2    Dallas alert 308                     1.10
daqt2    Dallas alert 451                     1.10
hibt2    Highbank                             1.09
vmat2    Valley Mills                         1.06

Dbdt2    Dallas alert 523                     1.06
east2    easterly                             1.04
bdwt2    Bardwell Lake                        1.03
lhb      Hearne Airport                       1.00

Dajt2    Dallas alert 185                     0.99
tddt2    Trinidad                             0.96
stet2    Streetman                            0.96
cnlt2    Crandall                             0.96

Lolt2    Long Lake                            0.92
scst2    Commerce                             0.89
dazt2    Dallas alert 553                     0.87
dakt2    Dallas alert 671                     0.87

Wlpt2    Wills Point                          0.86
lwwt2    Lake Waxahachie                      0.84
lvnt2    lake Lavon                           0.84
daot2    Dallas alert 455                     0.83

Daft2    Dallas alert 529                     0.82
dbit2    Dallas alert 195                     0.79
cdht2    Cedar Hill S.P. RAWS                 0.78
trl      Terrell ASOS                         0.76

Sclt2    jim Chapman Lake (co                 0.75
mlot2    Midlothian #2                        0.73
ctnt2    Clifton                              0.72
ddht2    Dallas alert 115                     0.67

Dbbt2    Dallas alert 677                     0.63
dbat2    Dallas alert 505                     0.63
dawt2    Navarro Mills Lake                   0.62
gvlt2    Greenville kgvl                      0.61

Bumt2    Blum                                 0.61
rsrt2    Rosser                               0.60
rhat2    Athens RAWS                          0.59
psnt2    Palestine crn                        0.59

Aplt2    Palestine RAWS                       0.59
lvtt2    Celeste                              0.58
dcpt2    Dallas alert 15                      0.55
prpt2    Prosper                              0.54

Copt2    Cooper                               0.54
hngt2    Honey Grove                          0.47
gky      Arlington ASOS                       0.46
jplt2    Lake Joe pool                        0.45

Dcnt2    Dallas alert 647                     0.44
rbd      Dallas Red Bird ASOS                 0.41
dbkt2    Dallas alert 689                     0.40
dczt2    Dallas alert 777                     0.39

Hqz      Mesquite Metro airpo                 0.38
gait2    Gainesville 1n                       0.37
gnvt2    Greenville                           0.36
bbdt2    Brandon                              0.35

Gtbt2    Grand Prairie alert                  0.31
lrit2    Little River                         0.30
bnmt2    Bonham 3nne                          0.30
mlet2    Malone                               0.29

Gpbt2    Grand Prairie alert                  0.28
psn      Palestine Municipal                  0.27
megt2    McGregor RAWS                        0.27
lmot2    Lometa                               0.27

Dwrt2    White Rock creek at                  0.27
dsbt2    deleon                               0.27
prx      Paris AWOS                           0.25
mlet2    Malone                               0.25

Gvt      Greenville Airport                   0.25

All time highest minimum temp set at D/FW Airport

Sean Toner — Tue, 26 Jul 2011 21:27:30 +0000

Assuming the ambient air temperature does not fall below 86 degrees by 1am tonight, then we will have set the ALL TIME highest minimum temperature at Dallas/Fort Worth airport today.

The incredible heat wave is expected to continue for at least the next week, with even hotter temperatures possible next Tuesday! Afternoon high temps are expected to increase as our dominant high pressure ridge intensifies across the region next week.

A small tropical system may move into the southwest Gulf of Mexico/Bay of Campeche by this weekend, but rain chances across the immediate metroplex aren’t likely to be affected.

The record statement from the National Weather Service is below:

...Record highest minimum temperature set at Dallas/Fort Worth...
...All time highest minimum temperature set at Dallas/Fort Worth...

The low temperature this morning at Dallas Fort Worth Airport was
86 degrees. This breaks the record highest minimum for July
26 of 84 degrees set in 1925 and 1954. 

The low temperature of 86 degrees also breaks the all time record
highest minimum.  The previous record was 85 degrees set on
September 1 1939 and yesterday...July 25 2011.

This data is preliminary until after 1 am tonight.

Tornado outbreak expected Tuesday 5/24/11

Sean Toner — Mon, 23 May 2011 23:25:34 +0000

The Storm Prediction Center in Norman, OK is forecasting a large tornado outbreak on Tuesday across much of Kansas, Oklahoma, and north Texas, including the DFW Metroplex. Very favorable conditions are coming into place for Tuesday afternoon to create a ‘classic plains tornadic outbreak’ as the SPC has mentioned.
EDIT: The SPC has upgraded areas of Oklahoma and Kansas to a High risk of severe weather, primary risk being long lived tornadoes.
EDIT 2: The SPC has enlargened and shifted the high risk areas further south to include parts of north central Texas . The entire DFW Metroplex is now included in the Moderate risk area, with the northern Metroplex included in the High risk!

5/24/11 Tornado Risk

5/24/11 Wind Risk

5/24/11 Hail Risk

All the main ingredients required for a tornadic outbreak are in place. Forecast CAPE values between 4000-5000 J/KG, bulk shearing of 70-80kts, low level shearing of 30kts with high level helicity values, enough frontogenic forcing along the dryline and a trough of low pressure to back it all up. CINH/cap values will be weakened enough by afternoon heating to allow isolated to scattered supercell development along and east of the dryline.

A CLASSIC PLAINS TORNADIC OUTBREAK APPEARS TO BE EVOLVING
ACROSS THE CNTRL/SRN PLAINS...ESPECIALLY FOR KANSAS AND OKLAHOMA.

FORECAST SOUNDINGS ACROSS THE WARM SECTOR EXHIBIT CLASSIC
TORNADIC SUPERCELL STRUCTURES WITH STRONG LOW LEVEL HELICITY
ACROSS KS/OK WITH DEEP LAYER SHEAR ON THE ORDER OF 50-60KT.

Right now the main question is, how far south along the dryline will these storms develop? If the developing low pressure system tracks just a bit further south than currently forecast, this would shift the highest risk area southward into north Texas.

Current forecasts for our area show areas north of I-20 to be in the highest risk for supercells and tornadic activity. Most of north Texas is under some type of risk area however, so everyone in the metroplex and surrounding areas needs to keep a close eye to Tuesday’s weather.

Now on most days you will see me outline the fact that the tornado risk is minimal or non-existent. It is my hope that by trying to minimize the times I highlight a tornado risk, that the truly high risk tornado days become much more meaningful and apparent.

In that light, I also want to point out that with the current forecast, much of Oklahoma and Kansas along the I-35 corridor will be in an extremely hazardous area for tornado potential. North Texas and by extension the DFW Metroplex, will miss much of the tornadic activity. This doesn’t mean we wont get any. All it takes is just one well placed tornado to make the news. But in plain black and white terms, expect tornadoes in north Texas on Tuesday.

Now the tornado risk for Tuesday will seem to be overshadowing the high wind and hail risk, but when strictly talking about probabilities, large hail will be the biggest concern for Tuesday. As with any severe thunderstorms a high wind risk will also be possible, but less likely than hail this time.

I will do my best to update my site with relevant weather data, but check the National Weather Service websites for the most up to date info.

National Weather Service – Fort Worth, TX
Storm Prediction Center

West Dallas tornado rated eF-2, six other tornadoes around north Texas

Sean Toner — Thu, 09 Sep 2010 22:59:39 +0000

Tornado damage consistent with an eF-2 tornado was found in West Dallas during a storm survey conducted by the National Weather Service today. The tornado’s path was one half mile in length, causing significant damage to numerous structures in that area. A preliminary track map shows it crossing the Trinity River and its levees, which should debunk any myths people may of had about tornadoes and river crossings… (source: http://www.srh.noaa.gov/fwd/?n=prelimtrackmap) I have included a tornado damage summary provided by the National Weather Service below.

Six other tornadoes were documented around the area, including another which caused moderate damage in southeast Dallas county, to the city of Seagoville. Below is radar snaps of the storm as it looked while producing the tornado in West Dallas. The storm is not overly impressive, when compared to supercells during our spring time severe weather season, but still displays the traditional hook echo and velocity couplet associated with tornadic supercells.

A similar feature is observed with the northeast Ellis/southeast Dallas counties tornado. A noteworthy hook echo and velocity couplet are observed by radar.

Thankfully the next 7 days don’t appear to show any significant tornado threats. Forecast models show marginal chances of thunderstorms Friday night, but I wouldn’t bet on it. Additionally a weak front may move through the area Saturday, then lay stationary across the Metroplex Sunday into Monday. This front has the potential to kick off organized severe development along and to the south of the front, but coverage of storms may be limited. Regardless I would consider storms a possibility Saturday and Sunday. Straight line winds and hail would be possible with stronger storms over the weekend, but the tornado threat will be minimal as environmental wind shearing will be very low. Temps the next 7 days will remain above normal and with high dew points due to the obvious abundance of moisture, our heat indexes will be around 100 to 105.

It would seem summer has not quite left us yet.

Tornado damage survey report by the NWS:

…PRELIMINARY DAMAGE REPORT…

A TOTAL OF SIX TORNADOES OCCURRED ON WEDNESDAY SEPTEMBER 8TH. FOUR
TORNADOES WERE RATED EF0 ON THE ENHANCED FUJITA SCALE. ONE TORNADO
WAS RATED EF1…AND ONE TORNADO WAS PRELIMINARILY RATED EF2. ONLY
TWO MINOR INJURIES HAVE BEEN REPORTED FROM ALL OF THESE STORMS.

THE EF2 TORNADO DAMAGE WAS LOCATED IN THE CITY OF DALLAS NEAR THE
INTERSECTION OF MOCKINGBIRD LANE AND IRVING BOULEVARD. THIS
TORNADO CAUSED MINOR ROOF DAMAGE TO SEVERAL BUILDINGS AND CAUSED
MORE EXTENSIVE DAMAGE TO A WAREHOUSE. AN EXTERIOR NON LOAD BEARING
WALL COLLAPSED…LEADING TO A PARTIAL COLLAPSE OF THE ROOF. THIS
DAMAGE WAS RATED EF2 ON THE ENHANCED FUJITA SCALE WITH WIND SPEEDS
OF APPROXIMATELY 115 MPH. THE LAST TIME THE CITY OF DALLAS HAD A
TORNADO RATED AT F2/EF2 OR HIGHER WAS F2 TORNADO DAMAGE ON APRIL
11 1974. THE LANCASTER TORNADO OF APRIL 25 1994 PRODUCED F4 DAMAGE
IN THE CITY OF LANCASTER BEFORE DISSIPATING WITHIN THE CITY LIMITS
OF DALLAS.

THE EF1 TORNADO DAMAGE WAS LOCATED IN THE CITY OF SEAGOVILLE JUST
EAST OF HIGHWAY 175. AT LEAST THREE APARTMENT BUILDINGS SUFFERED
SIGNIFICANT ROOF DAMAGE. WIND SPEEDS IN THIS TORNADO ARE ESTIMATED
TO BE NEAR 90 MPH.

THE REMAINING TORNADO DAMAGE WAS GIVEN A PRELIMINARY RATING OF
EF0. THESE TORNADOES OCCURRED NEAR LINDSAY IN COOKE COUNTY…NEAR
FERRIS IN ELLIS COUNTY…IN HEATH IN ROCKWALL COUNTY…AND NEAR
BLOSSOM IN LAMAR COUNTY.

THE ENHANCED FUJITA SCALE RATES TORNADO DAMAGE.

ENHANCED FUJITA SCALE APPROXIMATE WIND SPEED RANGE

EF0 65-85 MPH
EF1 86-110 MPH
EF2 111-135 MPH
EF3 136-165 MPH
EF4 166-200 MPH
EF5 200 MPH OR GREATER

Tropical Storm Hermine & it’s effects

Sean Toner — Thu, 09 Sep 2010 02:08:59 +0000

Tropical Storm Hermine, a remarkably impactful storm for the DFW Metroplex which sits 550 miles north of the storm’s initial landfall. The storm has brought severe flooding to a 300 mile stretch of central and north Texas, along the I-35 corridor. The worst flood effects are being felt in San Antonio through Austin. Flash flooding has even occurred in the Metroplex, the most notable being numerous homes and trailers flooded in the cities of Lewisville, Arlington, and Fort Worth. The heavy rains brought over 12 inches of rain near Austin as of 8am today (9/8/10) and 4 to 6 inches of rain in the Metroplex. (source: CoCoRaHS) My CoCoRaHS gauge captured 4.01 inches of rain in the 24hr period from 8am 9/7/10 to 8am 9/8/10. Another several inches have been observed since that time, with even more rain on the way. Below is radar estimated total rainfall from the FWS dopplar radar. An even more accurate and complete picture region wide view is available from the National Weather Service at http://www.srh.noaa.gov/ridge2/RFC_Precip/.

As if the flooding rainfalls weren’t enough, Hermine brought the risk of tornadoes to the region with several damage reports in Dallas, Highland Park, Seagoville, Ferris and Trumbull. Tornadoes embedded within the outer rain bands of tropical systems aren’t uncommon to coastal regions in the Gulf, but it is fairly unusual to get those type of tornadic storms this far away from the Gulf. Tornadoes in this type of environment tend to develop without warning and are difficult to detect with current radar technology, but are very brief and usually weak. The Dallas Morning News reported ripped up roofs in Cockrell Hill, Oak Cliff, West Dallas, and the Love Field areas. (source: Dallas Morning News) A Tornado Warning was also issued for a storm 4 miles south of Hebron at 5:37pm. The warned area included Frisco, Plano, and The Colony. The storm showed rotation on radar, and storm spotters observed a rotating wall cloud within the storm. Thankfully no tornado damage has been reported with this storm. Its center of circulation traveled north along the Denton/Collin county line, passing over Highway 121 and Plano Parkway, then dissipating. I got the pleasure of evacuating to our work’s ‘shelter’ area which amasses to little more than an open hallway, without access to my computer with accurate radar data.

A Tornado Watch still remains in effect for the entire DFW Metroplex, southeastern Oklahoma and western Arkansas until 1am. Another rain band is approaching from the west, with an approximate ETA of around 11pm to midnight tonight to Frisco/Plano/The Colony. Rain chances will continue Thursday, however nowhere near the levels observed the past two days. Hot and humid conditions should be expected the remainder of the week and weekend as the sun comes out and starts evaporating the abundance of water on the ground.

Lastly ill end with a quote from the local weather forecast office regarding the heavy rains the last two days…

DFW AND WACO HAVE BOTH SET CALENDAR-DAY PRECIPITATION RECORDS TODAY (SEPT 8). FOR BOTH SITES…THE 24-HR TOTALS (SEPT 7-8) WILL RANK AMONG THE TOP 10 ALL-TIME. PRECISE NUMBERS WILL BE AVAILABLE THURSDAY MORNING.

AT THE PRESENT TIME…THIS MONTH WILL RANK AS THE 4TH WETTEST SEPTEMBER ON RECORD FOR BOTH DALLAS/FORT WORTH AND WACO.

Half an inch shy of snowiest winter for DFW!

Sean Toner — Mon, 29 Mar 2010 03:38:19 +0000

One of the snowiest winters in D/FW history has finally ended, with official totals reaching 17.1 inches. Some areas even received 25 inches of snowfall this year!

A table of the top 10 snowiest winters, provided by the National Weather Service. This season ranked number 2, just half an inch behind breaking the record.

D/FW Snowiest Seasons

   1   17.6   1977-78
   2   17.1   2009-10*
   3   15.3   1963-64
   4   13.5   1923-24
   5   10.4   1976-77
   6    9.5   1909-10
   7    9.2   1916-17
   8    8.8   1947-48
   9    8.1   1937-38
  10    7.3   1965-66
        7.3   1941-42

The cause is undoubtedly related to El Nino, which has an indirect effect on allowing more Gulf moisture to make its way into the southern plains. This also causes the southern branch of the jet stream to bring pacific storm systems over the southern plains with greater frequency.

The National Weather Service wrote up a great summary of the numerous snowfall events this season, and can be found here

http://www.srh.noaa.gov/fwd/?n=wintersnow09-10

Snowfall totals for our late March snowstorm

Sean Toner — Sun, 21 Mar 2010 19:37:40 +0000

This unseasonably late snowfall further increased the 2009-2010 snowfall totals for our area, bringing us within 1/2 an inch of the all-time snowiest winter on record! Additionally the last time this much snow fell this late in the season was March 29 1937! Preliminary snowfall totals listed graphically below.

As you can see, the heaviest snow was concentrated within Collin County including a report in Frisco of 6 inches, and 8 inches reported in Allen. DFW Airport officially documented 1.3 inches of snowfall total from this event. The statement from the NWS included below.

The snow will not remain very long, as temperatures will quickly recover to the 60s on Monday and 70s by Tuesday. The next storm system will begin to affect the region on Wednesday evening, with thunderstorms likely. A shot of cooler air will follow as this system passes, but nowhere near this level of winter weather we just received.

...Spring snow for dfw...

Dfw Airport recorded 1.2 inches of snow on March 20th. This breaks
the previous daily record for March 20th of 0.4 inches set in 1970.
An additional 0.1 of an inch officially fell on March 21st and the 

event total is 1.3 inches. 

The additional 1.3 inches brings the 2009-2010 winter total to 17.1
inches. This ranks second of all time and came 0.5 inches shy of
tying the all-time record of 17.6 inches set in 1977-1978. 

This snow event was unseasonably late in the year. The last time an
inch or more fell at dfw later than March 20th was when 2 inches
fell on March 29th in 1937.

--------------------------------------------------------------------

Dallas/Fort Worth - snowiest seasons

   1   17.6   1977-78
   2   17.1   2009-10*
   3   15.3   1963-64
   4   13.5   1923-24
   5   10.4   1976-77
   6    9.5   1909-10
   7    9.2   1916-17

   8    8.8   1947-48
   9    8.1   1937-38
  10    7.3   1965-66
        7.3   1941-42
--------------------------------------------------------------------

DFW Snow Update: Snowiest day Dallas’ history!

Sean Toner — Fri, 12 Feb 2010 01:20:49 +0000

The latest from the National Weather Service, snowfall today now shatters the previous record at DFW Airport. A whopping 7.9 inches 11.2 inches of snow has fallen today 2/11/10, surpassing the previous single calendar day record of 7.8 inches set on 1/15/1964 and 1/14/1917. The real kicker, snowfall is set to continue for a few more hours! This makes February 11th the snowiest calendar day, and snowiest 24 hour period in the history of DFW Airport. This winter season is now the 4th 3rd snowiest winter on record at 11.1 14.4 inches total. Details below…

...Snow event one for the record books...

At 7 PM...dfw Airport had recorded 7.9 inches of snow today. This
breaks the previous daily record for February 11 of 1.4 inches set
in 1988. This also breaks the previous 24-hour record for
February...7.5 inches on February 17, 1978 and February 25, 1924.

This is the greatest calendar-day snowfall total on record for
Dallas/Fort Worth. The previous record was 7.8 inches on January 15,
1964 and January 14, 1917.

This brings the seasonal snowfall total to 11.1 inches...which is
the 4th highest seasonal total on record for Dallas/Fort Worth. This
is the snowiest winter in 32 seasons (since 1977-1978).

--------------------------------------------------------------------

Dallas/Fort Worth - snowiest seasons

   1   17.6   1977-78
   2   15.3   1963-64
   3   13.5   1923-24
   4   11.1   2009-10*
   5   10.4   1976-77
   6    9.5   1909-10
   7    9.2   1916-17
   8    8.8   1947-48
   9    8.1   1937-38
  10    7.3   1965-66
        7.3   1941-42

--------------------------------------------------------------------

Dallas/Fort Worth - most snow in February

   1   13.5   1978
   2    7.9   2010*
   3    7.5   1924

--------------------------------------------------------------------

Dallas/Fort Worth - greatest 24-hour snowfall totals

   1   12.1   January 15-16, 1964
   2    8.2   January 14-15, 1917
   3    7.9   February 11, 2010*
   4    7.5   February 17, 1978
        7.5   February 25, 1924
   6    6.0   March 13, 1924
   7    5.5   December 9, 1898
   8    5.0   November 22, 1937
        5.0   January 5, 1910
  10    4.7   November 13, 1976

--------------------------------------------------------------------

Severe hail size increased to 1 inch for SVR t-storm warnings

Sean Toner — Wed, 09 Dec 2009 07:09:43 +0000

The National Weather Service has officially adjusted the severe weather criteria for reporting hail… Previously, hail of 0.75 inches or larger was considered severe and would prompt a severe thunderstorm warning. Now to assist with reducing the amount of severe thunderstorm warnings and more accurately advise of severe weather, severe hail size is now increased to 1.0 inches. The change takes effect on January 5, 2010 for all regions in the USA.

To: subscribers: NWS partners…users and employees

Subject: National change in minimum hail size criterion
for issuing Severe Thunderstorm Warning /svr/
and severe weather statement /svs/ products
effective January 5 2010

Effective Tuesday January 5 2010 at 0001 coordinated Universal time
/UTC/…all NWS weather forecast offices /wfos/ will operationally
change the minimum hail size criterion used to issue Severe
Thunderstorm Warning /svr/ and severe weather statement /svs/
products from 3/4 inch /penny/ diameter or larger hail to 1 inch
/quarter/ diameter or larger hail.

No change is being made to the svr and svs product wind criterion
of wind gusts equal to or in excess of 50 knots /58 mph/.

A public information statement /pns/ soliciting comments regarding
this change was issued September 23 2009 /use lowercase/:

http://www.Weather.Gov/os/notification/pns09_1_inch_hail.Txt

NWS received 63 comments in response to the pns…54 of which /86
percent/ supported this change. A web Page will be created to
address all comments since some comments indicated a need for
additional outreach. This web Page will be available by December 15
2009 and will be publicized via another pns.

NWS reviewed all comments before deciding to change minimum hail
size criterion for svr and svs products.

Central and western region wfos currently issue svr and svs
products experimentally using the 1 inch /quarter/ diameter or
larger hail size criterion /use lower case/:

http://www.NWS.NOAA.Gov/om/notification/scn09-19hail_change.Txt

and

http://www.NWS.NOAA.Gov/om/notification/scn09-36wr_hail_exp.Txt

These wfos will continue to issue 1 inch /quarter/ hail size
criterion products experimentally through January 4 2010. All NWS
wfos will adopt the new criterion operationally on January 5 2010.

For further information regarding this change please contact:

John T ferree
fire and public weather services branch
120 David l. Boren Blvd suite 2312
Norman OK 73072
John.T.Ferree@noaa.Gov

Or

mark Fox
warning and coordination meteorologist
National Weather Service Fort Worth Texas
3401 northern cross Blvd
Fort Worth Texas 76137
mark.Fox@noaa.Gov
National service change notices are online at /use lowercase/: http://weather.Gov/os/notif.Htm

Freeze Warning tonight for parts of the metroplex

Sean Toner — Tue, 17 Nov 2009 20:49:55 +0000

A Freeze Warning has been issued overnight from 4am to 9am Wednesday. Lows are forecast to drop to 29-30 degrees across the western and northwestern parts of the region. A Freeze Warning is issued when the first freeze of the season is expected to occur, which can kill off more vulnerable plant life. The Freeze Warning is issued for several counties around the area including Denton, but not Collin, Tarrant, or Dallas counties. Temperatures in Frisco will reach around 35 degrees, whereas in Dallas and Fort Worth, temps will stay in the upper 30s to low 40s.

…Freeze warning in effect from 4 am to 9 am CST Wednesday…

The National Weather Service in Fort Worth has issued a freeze
warning…which is in effect from 4 am to 9 am CST Wednesday.

Temperatures tonight and early Wednesday morning will drop to near
freezing…mainly along and to the west of a line from
Gainesville…to Denton…to Azle…to Meridian. The coldest
temperatures will occur in valleys and other sheltered locations.
While some locations such as hilltops will not reach
freezing…a widespread frost is expected across the area. Frost
can be just as damaging as a freeze to tender vegetation.

Precautionary/preparedness actions…

A freeze warning means that the seasons first episode of sub-
freezing temperatures are likely to occur. These conditions will
kill sensitive plants and residents are advised to protect any
tender vegetation.