Alert archive / Texas / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 169, NWS Fort Worth, TX

April 25, 2011Collin County, Grayson County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at Apr 25, 2011, 3:36 PM CDT for Collin County, Grayson County, Texas. It was in force for 54 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 25, 2011, 3:36 PM CDT (20:36 UTC)
Expired: Apr 25, 2011, 4:30 PM CDT
In force: 54 min
Issued by: NWS Fort Worth, TX
Area: Storm-based polygon

Counties Collin County, TX, Grayson County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 112 km from the middle of the area, began a volume at 20:36 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 25, 11:00 AM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 8.6 hours before the alert went out and 89 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 2645 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 564 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 346 m²/s²
0-3 km storm-relative helicity: 373 m²/s²
Significant tornado parameter: 6.1
Supercell composite: 21.8

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Fort Worth, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 25, 2:48 PM CDT, 48 minutes earlier.

Area forecast discussion, Apr 25, 2:48 PM CDT, 48 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE FORT WORTH TX
248 PM CDT MON APR 25 2011

.DISCUSSION...
HIGH END SEVERE THREAT CONTINUES FOR THE REST OF TODAY..WITH
TORNADO WATCHES COVERING ALL AREAS EAST OF THE COLD FRONT/DRY
LINE. MIDDAY SOUNDING SHOWS ALMOST 5000 JOULES OF CAPE...THE
MOST WE HAVE SEEN IN QUITE A WHILE.

COLD FRONT/DRY LINE WILL SHUT OFF CONVECTION FROM THE WEST...BUT
ON TUESDAY THE WARM SECTOR WILL STILL COVER EASTERN NORTH TEXAS
AND AS FRONT RETREATS NORTH THERE REMAINS A THREAT FOR STORMS IN
THE SOUTH AND EAST THROUGH TUESDAY NIGHT. ON WEDNESDAY THE NEXT
SYSTEM PUSHES THE COLD FRONT THROUGH EARLY AND THE STORM THREAT
SHUTS OFF FROM THE WEST AGAIN. BY MID DAY NORTH TEXAS SHOULD BE DONE
WITH STORMS FOR A FEW DAYS.

EXPECT A DRIER ATMOSPHERE AND SOME SUBSIDENCE...AND THUS A
CAP...THROUGH FRIDAY. NEXT FRONT PUSHES IN SATURDAY AND HAVE
CONTINUED THE LOW POPS FOR THAT SYSTEM.

&&

.PRELIMINARY POINT TEMPS/POPS...
DALLAS-FT. WORTH, TX  56  85  57  76  51 /  40  10  20   5   5
WACO, TX              64  93  57  82  48 /  20  20  20   5   5
PARIS, TX             62  80  55  72  49 /  60  20  40  30   5
DENTON, TX            56  83  53  75  46 /  40  10  20   5   5
MCKINNEY, TX          56  84  55  75  48 /  50  10  30  10   5
DALLAS, TX            58  86  57  77  53 /  50  10  20   5   5
TERRELL, TX           62  84  55  77  48 /  60  20  30  10   5
CORSICANA, TX         70  88  57  80  49 /  50  20  20   5   5
TEMPLE, TX            66  95  58  85  48 /  20  20  20   5   5
MINERAL WELLS, TX     56  88  53  77  46 /  10  10  10   5   5

&&

.FWD WATCHES/WARNINGS/ADVISORIES...
NONE.

&&

Hazardous weather outlook, Apr 25, 2:26 PM CDT, 1 hour 10 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE FORT WORTH TX
226 PM CDT MON APR 25 2011

TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-261145-
MONTAGUE-COOKE-GRAYSON-FANNIN-LAMAR-YOUNG-JACK-WISE-DENTON-COLLIN-
HUNT-DELTA-HOPKINS-STEPHENS-PALO PINTO-PARKER-TARRANT-DALLAS-
ROCKWALL-KAUFMAN-VAN ZANDT-RAINS-EASTLAND-ERATH-HOOD-SOMERVELL-
JOHNSON-ELLIS-HENDERSON-COMANCHE-MILLS-HAMILTON-BOSQUE-HILL-NAVARRO-
FREESTONE-ANDERSON-LAMPASAS-CORYELL-BELL-MCLENNAN-FALLS-LIMESTONE-
LEON-MILAM-ROBERTSON-
226 PM CDT MON APR 25 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH TEXAS.

.DAY ONE...THROUGH TONIGHT.

A TORNADO WATCH IS IN EFFECT FOR MUCH OF NORTH TEXAS THROUGH 6 PM.

THERE IS A CHANCE OF THUNDERSTORMS ACROSS ALL OF NORTH TEXAS
THROUGH THIS EVENING. SEVERE THUNDERSTORMS ARE EXPECTED TO DEVELOP
ALONG AND EAST A DRY LINE AND COLD FRONT THIS AFTERNOON. THERE IS A
SLIGHT RISK OF SEVERE THUNDERSTORMS ALONG THE I-35 CORRIDOR AND A
MODERATE RISK OF SEVERE THUNDERSTORMS TO THE EAST OF I-35. SEVERE
THUNDERSTORMS WILL HAVE THE POTENTIAL TO PRODUCE VERY LARGE
HAIL...DAMAGING WINDS...AND TORNADOES. AREAS THAT SAW SOAKING
RAINS OVER THE WEEKEND MAY EXPERIENCE NUISANCE PONDING OR FLASH
FLOODING IF SUSTAINED HEAVY RAIN OCCURS AGAIN TODAY.

ELEVATED FIRE WEATHER CONDITIONS ARE EXPECTED ACROSS THE WESTERN
COUNTIES OF NORTH TEXAS THIS AFTERNOON DUE TO DRY AND BREEZY
CONDITIONS. HOWEVER...RECENT RAINFALL SHOULD KEEP CONDITIONS FROM
REACHING CRITICAL LEVELS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.
THUNDERSTORM CHANCES CONTINUE ACROSS THE SOUTHEAST SECTION OF
NORTH TEXAS TUESDAY AND ACROSS THE NORTHERN AREAS TUESDAY NIGHT
AND WEDNESDAY MORNING. SOME STORMS MAY BECOME SEVERE WITH LARGE
HAIL AND DAMAGING DOWNBURST WINDS.

ELEVATED FIRE WEATHER CONDITIONS ARE LIKELY WEDNESDAY AFTERNOON
ACROSS MOST OF THE REGION.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS LIKELY ALONG AND EAST OF INTERSTATE 35 THIS
AFTERNOON AND TONIGHT.

In the hours before

Local storm report, Apr 25, 2:48 PM CDT, 48 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
248 PM CDT MON APR 25 2011

..TIME..    ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE..    ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0247 PM     HAIL             2 N KRUM                33.30N  97.25W
04/25/2011  E1.75 INCH       DENTON             TX   TRAINED SPOTTER

Local storm report, Apr 25, 2:51 PM CDT, 45 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
251 PM CDT MON APR 25 2011

..TIME..    ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE..    ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0249 PM     TSTM WND DMG     6 NNW PALESTINE         31.83N  95.67W
04/25/2011                   ANDERSON           TX   EMERGENCY MNGR

            TREES DOWN 6 MILES NORTH OF PALESTINE

Local storm report, Apr 25, 3:12 PM CDT, 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
312 PM CDT MON APR 25 2011

..TIME..    ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE..    ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0250 PM     HAIL             5 SE GRANBURY           32.40N  97.74W
04/25/2011  E1.00 INCH       HOOD               TX   TRAINED SPOTTER

            ONE INCH HAIL IN PECAN PLANTATION.

Local storm report, Apr 25, 3:15 PM CDT, 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
315 PM CDT MON APR 25 2011

..TIME..    ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE..    ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0312 PM     TORNADO          8 SW CLEBURNE           32.27N  97.50W
04/25/2011                   JOHNSON            TX   BROADCAST MEDIA

            TORNADO 1 MILE EAST OF CLEBURNE STATE PARK

Local storm report, Apr 25, 3:16 PM CDT, 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
316 PM CDT MON APR 25 2011

..TIME..    ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE..    ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1130 PM     HAIL             ANNETTA                 32.72N  97.65W
04/24/2011  MM2.50 INCH      PARKER             TX   TRAINED SPOTTER

            TENNIS BALL HAIL AND 45 MPH WINDS IN ANNETTA NORTH.

Special weather statement, Apr 25, 3:29 PM CDT, 7 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE FORT WORTH TX
329 PM CDT MON APR 25 2011

TXZ157-252100-
CORYELL TX-
329 PM CDT MON APR 25 2011

...SIGNIFICANT WEATHER ADVISORY FOR...
  NORTHERN CORYELL COUNTY

AT 329 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
STRONG THUNDERSTORM 10 MILES WEST OF GATESVILLE...MOVING EAST AT 35
MPH.

CITIES IN THE PATH OF THIS STORM INCLUDE FORT GATES AND GATESVILLE.

PENNY-SIZED HAIL AND WIND GUSTS TO 40 MPH CAN BE EXPECTED FROM THIS
STORM.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT.

LAT...LON 3153 9803 3163 9763 3145 9750 3143 9749
      3132 9796
TIME...MOT...LOC 2029Z 252DEG 29KT 3143 9789

The office that day

Everything else NWS Fort Worth, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 24, 7:10 PM CDT	Severe Thunderstorm Warning	FWD	Collin, Cooke, Denton, Grayson, Tarrant	50 min
Apr 24, 7:16 PM CDT	Special Weather Statement	FWD	Dallas	29 min
Apr 24, 7:21 PM CDT	Severe Thunderstorm Warning	FWD	Eastland, Stephens	39 min
Apr 24, 7:30 PM CDT	Special Weather Statement	FWD	Dallas	30 min
Apr 24, 7:43 PM CDT	Severe Thunderstorm Warning	FWD	Eastland, Erath, Hood, Palo Pinto, Parker	62 min
Apr 24, 7:48 PM CDT	Severe Thunderstorm Warning	FWD	Collin, Fannin, Grayson, Hunt	42 min
Apr 24, 8:25 PM CDT	Severe Thunderstorm Warning	FWD	Collin, Delta, Fannin, Hunt, Lamar	50 min
Apr 24, 8:43 PM CDT	Severe Thunderstorm Warning	FWD	Erath, Hood, Johnson, Parker, Tarrant	62 min
Apr 24, 8:44 PM CDT	Severe Thunderstorm Warning	FWD	Comanche, Eastland	46 min
Apr 24, 8:49 PM CDT	Special Weather Statement	FWD	Lamar	26 min
Apr 24, 9:16 PM CDT	Special Weather Statement	FWD	Lamar	29 min
Apr 24, 9:22 PM CDT	Tornado Warning	FWD	Comanche, Eastland	38 min
Apr 24, 9:34 PM CDT	Severe Thunderstorm Warning	FWD	Dallas, Ellis, Johnson, Tarrant	56 min
Apr 24, 9:36 PM CDT	Areal Flood Advisory	FWD	Lamar	3 hr
Apr 24, 9:41 PM CDT	Severe Thunderstorm Warning	FWD	Hood, Parker	34 min
Apr 24, 9:57 PM CDT	Severe Thunderstorm Warning	FWD	Comanche	48 min
Apr 24, 10:15 PM CDT	Special Weather Statement	FWD	Jack, Palo Pinto	30 min
Apr 24, 10:22 PM CDT	Severe Thunderstorm Warning	FWD	Comanche, Erath	38 min
Apr 24, 10:25 PM CDT	Severe Thunderstorm Warning	FWD	Comanche	50 min
Apr 24, 10:27 PM CDT	Severe Thunderstorm Warning	FWD	Collin, Dallas, Hunt, Kaufman, Rockwall	48 min
Apr 24, 10:31 PM CDT	Severe Thunderstorm Warning	FWD	Palo Pinto, Parker	59 min
Apr 24, 10:37 PM CDT	Special Weather Statement	FWD	Jack	23 min
Apr 24, 10:57 PM CDT	Severe Thunderstorm Warning	FWD	Erath	63 min
Apr 24, 11:11 PM CDT	Severe Thunderstorm Warning	FWD	Comanche	64 min
Apr 24, 11:14 PM CDT	Severe Thunderstorm Warning	FWD	Delta, Hopkins, Hunt	61 min
Apr 24, 11:28 PM CDT	Severe Thunderstorm Warning	FWD	Parker, Tarrant	47 min
Apr 25, 12:09 AM CDT	Severe Thunderstorm Warning	FWD	Comanche, Erath, Hamilton	51 min
Apr 25, 12:18 AM CDT	Special Weather Statement	FWD	Young	27 min
Apr 25, 12:26 AM CDT	Severe Thunderstorm Warning	FWD	Young	49 min
Apr 25, 12:58 AM CDT	Severe Thunderstorm Warning	FWD	Hamilton	47 min
Apr 25, 1:13 AM CDT	Severe Thunderstorm Warning	FWD	Jack, Stephens, Young	62 min
Apr 25, 1:56 AM CDT	Severe Thunderstorm Warning	FWD	Jack, Montague, Wise	64 min
Apr 25, 2:00 AM CDT	Special Weather Statement	FWD	Comanche	30 min
Apr 25, 2:07 AM CDT	Special Weather Statement	FWD	Parker	23 min
Apr 25, 2:23 AM CDT	Severe Thunderstorm Warning	FWD	Parker	37 min
Apr 25, 2:29 AM CDT	Special Weather Statement	FWD	Comanche	31 min
Apr 25, 2:40 AM CDT	Special Weather Statement	FWD	Cooke	35 min
Apr 25, 2:56 AM CDT	Severe Thunderstorm Warning	FWD	Wise	49 min
Apr 25, 3:02 AM CDT	Special Weather Statement	FWD	Tarrant	28 min
Apr 25, 3:12 AM CDT	Special Weather Statement	FWD	Hood	33 min
Apr 25, 3:17 AM CDT	Special Weather Statement	FWD	Grayson	28 min
Apr 25, 3:21 AM CDT	Severe Thunderstorm Warning	FWD	Denton, Tarrant	54 min
Apr 25, 4:14 AM CDT	Special Weather Statement	FWD	Lamar	31 min
Apr 25, 4:16 AM CDT	Special Weather Statement	FWD	Tarrant	29 min
Apr 25, 4:20 AM CDT	Severe Thunderstorm Warning	FWD	Tarrant	55 min
Apr 25, 4:39 AM CDT	Special Weather Statement	FWD	Johnson	36 min
Apr 25, 4:40 AM CDT	Severe Thunderstorm Warning	FWD	Dallas	40 min
Apr 25, 5:02 AM CDT	Special Weather Statement	FWD	Ellis	28 min
Apr 25, 5:32 AM CDT	Special Weather Statement	FWD	Kaufman	28 min
Apr 25, 6:08 AM CDT	Special Weather Statement	FWD	Rains	37 min
Apr 25, 10:32 AM CDT	Severe Thunderstorm Warning	FWD	Collin, Dallas, Kaufman, Rockwall	58 min
Apr 25, 10:54 AM CDT	Severe Thunderstorm Warning	FWD	Delta, Lamar	66 min
Apr 25, 11:00 AM CDT	Severe Thunderstorm Warning	FWD	Collin, Fannin, Hunt	60 min
Apr 25, 11:13 AM CDT	Special Weather Statement	FWD	Ellis	32 min
Apr 25, 11:42 AM CDT	Special Weather Statement	FWD	Tarrant	33 min
Apr 25, 12:06 PM CDT	Special Weather Statement	FWD	Rockwall	24 min
Apr 25, 12:23 PM CDT	Special Weather Statement	FWD	Delta, Hopkins, Hunt, Lamar	37 min
Apr 25, 12:28 PM CDT	Special Weather Statement	FWD	Rains	32 min
Apr 25, 12:56 PM CDT	Special Weather Statement	FWD	Montague	34 min
Apr 25, 12:58 PM CDT	Severe Thunderstorm Warning	FWD	Hopkins, Hunt, Rains	62 min
Apr 25, 1:12 PM CDT	Flash Flood Warning	FWD	Delta, Lamar	2 hr
Apr 25, 1:13 PM CDT	Special Weather Statement	FWD	Erath	32 min
Apr 25, 1:19 PM CDT	Severe Thunderstorm Warning	FWD	Erath	56 min
Apr 25, 1:25 PM CDT	Severe Thunderstorm Warning	FWD	Cooke, Montague	65 min
Apr 25, 1:32 PM CDT	Special Weather Statement	FWD	Lamar	28 min
Apr 25, 1:43 PM CDT	Special Weather Statement	FWD	Freestone	32 min
Apr 25, 1:47 PM CDT	Severe Thunderstorm Warning	FWD	Cooke, Montague	58 min
Apr 25, 1:48 PM CDT	Severe Thunderstorm Warning	FWD	Hood, Johnson, Somervell	57 min
Apr 25, 1:49 PM CDT	Severe Thunderstorm Warning	FWD	Wise	56 min
Apr 25, 1:53 PM CDT	Severe Thunderstorm Warning	FWD	Anderson, Freestone, Henderson, Navarro	67 min
Apr 25, 1:56 PM CDT	Tornado Warning	FWD	Erath, Hood, Somervell	49 min
Apr 25, 2:06 PM CDT	Special Weather Statement	FWD	Freestone	24 min
Apr 25, 2:14 PM CDT	Special Weather Statement	FWD	Van Zandt	31 min
Apr 25, 2:18 PM CDT	Severe Thunderstorm Warning	FWD	Freestone, Limestone	42 min
Apr 25, 2:28 PM CDT	Severe Thunderstorm Warning	FWD	Denton	62 min
Apr 25, 2:31 PM CDT	Severe Thunderstorm Warning	FWD	Cooke, Grayson	59 min
Apr 25, 2:38 PM CDT	Tornado Warning	FWD	Bosque, Hill, Hood, Johnson, Somervell	52 min
Apr 25, 2:57 PM CDT	Severe Thunderstorm Warning	FWD	Anderson, Henderson	33 min
Apr 25, 3:00 PM CDT	Severe Thunderstorm Warning	FWD	Anderson, Freestone	45 min
Apr 25, 3:20 PM CDT	Tornado Warning	FWD	Anderson	40 min

Nearby

Severe Thunderstorm Warnings in Texas, 2011 Every severe thunderstorm warning in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.