Alert archive / Texas / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 232, NWS Fort Worth, TX

May 1, 2011Grayson County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at May 1, 2011, 6:05 AM CDT for Grayson County, Texas. It was in force for 25 min. 5 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 1, 2011, 6:05 AM CDT (11:05 UTC)
Expired: May 1, 2011, 6:30 AM CDT
In force: 25 min
Issued by: NWS Fort Worth, TX
Area: Storm-based polygon

County Grayson County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 152 km from the middle of the area, began a volume at 11:09 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.

What was reported inside it

Time	Report	Where	Remark
May 1, 6:12 AM CDT	TSTM WND GST 60	3 Sw Pottsboro, TX
May 1, 6:18 AM CDT	TSTM WND GST 60	2 Nw Sherman, TX	60 MPH WIND GUST AT THE NORTH TEXAS REGIONAL AIRPORT NEAR SHERMAN
May 1, 6:20 AM CDT	TSTM WND DMG	2 Nw Sherman, TX	ROOFS BLOWN OFF OF 2 BUILDINGS AT NORTH TEXAS REGIONAL AIRPORT
May 1, 6:25 AM CDT	TSTM WND DMG	Denison, TX	STEEPLE BLOWN OFF OF PARKSIDE BAPTIST CHURCH
May 1, 6:25 AM CDT	TSTM WND GST 65	1 N Denison, TX	65 MPH WIND GUST MEASURED IN NORTH DENNISON

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 5 storm reports to this severe thunderstorm warning; the first came 7 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

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

Issued	Product	Office	Lasted
May 1, 1:40 AM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 11.1 hours before the alert went out and 126 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: 277 J/kg
Mixed-layer CIN: -315 J/kg
Mixed-layer LCL: 1957 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 97 m²/s²
0-3 km storm-relative helicity: 148 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

676 
WUUS54 KFWD 011105
SVRFWD
TXC181-011130-
/O.NEW.KFWD.SV.W.0232.110501T1105Z-110501T1130Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE FORT WORTH TX
605 AM CDT SUN MAY 1 2011

THE NATIONAL WEATHER SERVICE IN FORT WORTH HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN GRAYSON COUNTY IN NORTH CENTRAL TEXAS...

* UNTIL 630 AM CDT

* AT 606 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 7 MILES
  WEST OF POTTSBORO...AND MOVING NORTHEAST AT 40 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  POTTSBORO AND KNOLLWOOD AROUND 615 AM
  EISENHOWER STATE PARK AND DENISON AROUND 620 AM

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A STRONG BUILDING AND
STAY INSIDE...AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

&&

LAT...LON 3389 9659 3387 9661 3384 9659 3383 9651
      3378 9648 3379 9642 3374 9636 3363 9639
      3361 9691 3386 9692 3388 9679 3384 9676
      3384 9671 3389 9669 3390 9661
TIME...MOT...LOC 1106Z 235DEG 33KT 3375 9677

$$

2 follow-up statements

492 
WWUS54 KFWD 011119
SVSFWD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE FORT WORTH TX
619 AM CDT SUN MAY 1 2011

TXC181-011130-
/O.CON.KFWD.SV.W.0232.000000T0000Z-110501T1130Z/
GRAYSON TX-
619 AM CDT SUN MAY 1 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 AM CDT
FOR NORTHERN GRAYSON COUNTY...

AT 619 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR 
POTTSBORO...MOVING NORTHEAST AT 40 MPH. 60 MPH WINDS WERE REPORTED 
AT THE NORTH TEXAS REGIONAL AIRPORT NEAR SHERMAN AT 618 AM.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  RURAL NORTHERN GRAYSON COUNTY AT 630 AM CDT

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 AM CDT SUNDAY
MORNING FOR NORTH CENTRAL TEXAS.

&&

LAT...LON 3389 9659 3387 9661 3384 9659 3383 9651
      3378 9648 3379 9642 3374 9636 3363 9639
      3362 9677 3386 9692 3388 9679 3384 9676
      3384 9671 3389 9669 3390 9661
TIME...MOT...LOC 1119Z 235DEG 33KT 3382 9665

$$

739 
WWUS54 KFWD 011129
SVSFWD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE FORT WORTH TX
629 AM CDT SUN MAY 1 2011

TXC181-011139-
/O.EXP.KFWD.SV.W.0232.000000T0000Z-110501T1130Z/
GRAYSON TX-
629 AM CDT SUN MAY 1 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN GRAYSON COUNTY
EXPIRES AT 630 AM CDT...

AT 629 AM CDT THE SEVERE THUNDERSTORM THAT PROMPTED THE WARNING MOVED
OUT OF THE AREA AND THE WARNING WILL EXPIRE AT 630 AM.

RADAR INDICATED THAT HEAVY RAIN...SMALL HAIL...AND GUSTY WINDS TO 50 
MPH WERE STILL POSSIBLE FROM THUNDERSTORMS OVER NORTHEAST GRAYSON 
COUNTY THROUGH 7 AM.  IN ADDITION...STRONG STORMS WILL RE-ENTER 
GRAYSON COUNTY AFTER 7 AM.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 AM CDT SUNDAY
MORNING FOR NORTH CENTRAL TEXAS.

LAT...LON 3389 9659 3387 9661 3384 9659 3383 9651
      3378 9648 3379 9642 3374 9636 3363 9639
      3362 9677 3386 9692 3388 9679 3384 9676
      3384 9671 3389 9669 3390 9661
TIME...MOT...LOC 1129Z 235DEG 33KT 3387 9656

$$

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 May 1, 4:00 AM CDT, 2 hours 5 minutes earlier.

Area forecast discussion, May 1, 4:00 AM CDT, 2 hours 5 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE FORT WORTH TX
400 AM CDT SUN MAY 1 2011

.DISCUSSION...
A COLD FRONT EXTENDED SOUTH OF A PARIS...TERRELL...CLEBURNE...
BROWNWOOD LINE AS OF 3 AM. THIS FRONT WILL CONTINUE TO MOVE SOUTH
AND SHOULD BE THROUGH THE SOUTHEASTERN PART OF NORTH TEXAS BEFORE
SUNSET. SCATTERED THUNDERSTORMS...SOME SEVERE...HAVE BEEN
OCCURRING MAINLY NORTH OF THE FRONT OVERNIGHT. THESE ELEVATED
STORMS HAVE PRODUCED HAIL UP TO THE SIZE OF BASEBALLS. THE SEVERE
POTENTIAL WILL CONTINUE THROUGH TONIGHT. THERE IS ALSO THE
POTENTIAL FOR SOME LOCALLY HEAVY RAIN THROUGH MONDAY. A FLASH
FLOOD WATCH MAY BE NEEDED FOR TONIGHT INTO MONDAY ACROSS THE
AREA NORTHEASTERN 1/4 OF NORTH TEXAS. FOR NOW HAVE JUST INCLUDED A
MENTION OF HEAVY RAIN. WE WILL SEE GOOD CHANCES OF RAIN THROUGH
THE NEXT 48 HOURS...WITH RAIN ENDING FROM WEST TO EAST LATE MONDAY
NIGHT AND TUESDAY MORNING AS AN UPPER LEVEL TROUGH FINALLY MOVES
TO THE EAST. DRY WEATHER IS THEN EXPECTED FOR THE REST OF THE
WEEK. AFTER BELOW SEASONAL NORMAL TEMPERATURES TODAY THROUGH
TUESDAY...WE WILL START TO SEE A WARMING TREND. TEMPERATURES WILL
CLIMB BACK TO ABOVE SEASONAL NORMALS FRIDAY THROUGH THE WEEKEND.

58

&&

.PRELIMINARY POINT TEMPS/POPS...
DALLAS-FT. WORTH, TX  65  47  54  44  70 /  90  80  80  40   5
WACO, TX              79  45  56  41  72 /  70  80  70  40   5
PARIS, TX             66  48  53  45  68 / 100  80  80  50   5
DENTON, TX            62  45  53  39  70 /  90  70  70  30   5
MCKINNEY, TX          65  44  53  39  69 / 100  80  80  40   5
DALLAS, TX            68  47  54  45  70 / 100  80  80  40   5
TERRELL, TX           71  46  54  43  68 / 100  80  80  50   5
CORSICANA, TX         78  50  56  46  68 /  80  80  70  50   5
TEMPLE, TX            79  46  56  42  71 /  60  80  60  40   5
MINERAL WELLS, TX     62  44  51  37  71 /  80  80  70  20   5

&&

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

&&

84/58

Hazardous weather outlook, May 1, 5:25 AM CDT, 40 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE FORT WORTH TX
525 AM CDT SUN MAY 1 2011

TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-021030-
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-
525 AM CDT SUN MAY 1 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH TEXAS.

.DAY ONE...TODAY AND TONIGHT.
THUNDERSTORMS...SOME SEVERE...WILL CONTINUE TO BE A THREAT ACROSS
THE ENTIRE AREA TODAY THROUGH THE OVERNIGHT HOURS. THE MAIN
THREATS WILL BE LIGHTNING...LARGE HAIL AND DAMAGING WINDS
ALTHOUGH THERE WILL BE A TORNADO RISK IN THE EASTERN HALF OF
NORTH TEXAS TODAY AND THIS EVENING. THERE IS ALSO THE THREAT OF
LOCALIZED FLASH FLOODING FROM HEAVY RAINS SHOULD MULTIPLE STORMS
PASS THROUGH A GIVEN AREA.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.
THUNDERSTORM CHANCES WILL CONTINUE MONDAY THROUGH EARLY TUESDAY
MORNING. HEAVY RAIN AND THE POTENTIAL FOR FLASH FLOODING IS THE
MAIN THREAT. THE SEVERE THREAT APPEARS LESS...BUT A FEW STORMS
COULD PRODUCE LARGE HAIL.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS LIKELY ACROSS THE AREA THROUGH THE
OVERNIGHT HOURS.

In the hours before

Local storm report, May 1, 5:08 AM CDT, 57 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
508 AM CDT SUN MAY 01 2011

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

0537 AM     HAIL             3 N JOSHUA              32.51N  97.38W
05/01/2011  E1.00 INCH       JOHNSON            TX   PUBLIC

            QUARTER SIZE HAIL 3 NORTH OF JOSHUA AT FM 1902 AND CR
            920

Local storm report, May 1, 5:20 AM CDT, 45 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
520 AM CDT SUN MAY 01 2011

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

0507 AM     HAIL             FERRIS                  32.53N  96.67W
05/01/2011  E0.88 INCH       ELLIS              TX   LAW ENFORCEMENT

Local storm report, May 1, 5:43 AM CDT, 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
543 AM CDT SUN MAY 01 2011

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

0540 AM     HAIL             3 S RINGGOLD            33.78N  97.95W
05/01/2011  E1.00 INCH       MONTAGUE           TX   AMATEUR RADIO

Special weather statement, May 1, 5:46 AM CDT, 19 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE FORT WORTH TX
546 AM CDT SUN MAY 1 2011

TXZ092-093-011115-
GRAYSON TX-COOKE TX-
546 AM CDT SUN MAY 1 2011

...SIGNIFICANT WEATHER ADVISORY FOR...
  EASTERN COOKE COUNTY
  GRAYSON COUNTY

AT 547 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 21 MILES NORTH OF
WHITESBORO TO 14 MILES NORTHEAST OF SANGER...MOVING EAST AT 45 MPH.

CITIES IN THE PATH OF THESE STORMS INCLUDE BELLS...CALLISBURG...
COLLINSVILLE...DENISON...DORCHESTER...GUNTER...HOWE...KNOLLWOOD...
POTTSBORO...SHERMAN...TOM BEAN...VAN ALSTYNE...WHITESBORO AND
EISENHOWER STATE PARK.

PENNY-SIZED HAIL AND WIND GUSTS TO 45 MPH CAN BE EXPECTED FROM THESE
STORMS.

IF THIS STORM INTENSIFIES...A SEVERE WEATHER WARNING MAY BE NEEDED.

A TORNADO WATCH REMAINS IN EFFECT UNTIL NOON CDT SUNDAY FOR
NORTHEASTERN TEXAS. A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN
EFFECT UNTIL 900 AM CDT SUNDAY MORNING FOR NORTH CENTRAL TEXAS.

LAT...LON 3384 9659 3382 9651 3378 9648 3379 9645
      3374 9638 3341 9641 3343 9705 3385 9702
      3388 9700 3388 9687 3386 9685 3388 9679
      3384 9676 3384 9671 3389 9668 3389 9662
TIME...MOT...LOC 1047Z 259DEG 40KT 3397 9694 3347 9694

Local storm report, May 1, 6:00 AM CDT, 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
600 AM CDT SUN MAY 01 2011

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

0330 AM     TSTM WND DMG     OLNEY                   33.37N  98.77W
05/01/2011                   YOUNG              TX   PUBLIC

            NUMEROUS LARGE TREES UPROOTED OR SNAPPED IN OLNEY

Local storm report, May 1, 6:02 AM CDT, 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
602 AM CDT SUN MAY 01 2011

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

0601 AM     HAIL             4 E NOCONA              33.78N  97.66W
05/01/2011  E1.00 INCH       MONTAGUE           TX   EMERGENCY MNGR

            QUARTER SIZE HAIL 4 MILES EAST OF NOCONA

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 30, 7:03 PM CDT	Severe Thunderstorm Warning	FWD	Dallas, Kaufman, Rockwall	57 min
Apr 30, 7:24 PM CDT	Severe Thunderstorm Warning	FWD	Fannin, Hunt	36 min
Apr 30, 7:52 PM CDT	Severe Thunderstorm Warning	FWD	Delta, Lamar	56 min
Apr 30, 7:56 PM CDT	Special Weather Statement	FWD	Hamilton	34 min
May 1, 1:32 AM CDT	Special Weather Statement	FWD	Stephens	28 min
May 1, 1:36 AM CDT	Severe Thunderstorm Warning	FWD	Eastland, Erath, Palo Pinto, Stephens	54 min
May 1, 2:27 AM CDT	Severe Thunderstorm Warning	FWD	Erath, Hood, Palo Pinto, Parker	63 min
May 1, 3:09 AM CDT	Severe Thunderstorm Warning	FWD	Young	51 min
May 1, 3:21 AM CDT	Severe Thunderstorm Warning	FWD	Hood, Johnson, Parker, Tarrant	54 min
May 1, 3:46 AM CDT	Severe Thunderstorm Warning	FWD	Jack, Young	44 min
May 1, 4:10 AM CDT	Special Weather Statement	FWD	Cooke	35 min
May 1, 4:12 AM CDT	Severe Thunderstorm Warning	FWD	Dallas, Ellis, Johnson, Tarrant	48 min
May 1, 4:27 AM CDT	Severe Thunderstorm Warning	FWD	Jack, Montague, Wise	48 min
May 1, 4:41 AM CDT	Severe Thunderstorm Warning	FWD	Cooke	49 min
May 1, 4:58 AM CDT	Severe Thunderstorm Warning	FWD	Dallas, Ellis, Kaufman	43 min
May 1, 5:30 AM CDT	Severe Thunderstorm Warning	FWD	Montague	30 min
May 1, 5:46 AM CDT	Special Weather Statement	FWD	Grayson	29 min
May 1, 6:09 AM CDT	Severe Thunderstorm Warning	FWD	Montague	36 min
May 1, 6:41 AM CDT	Special Weather Statement	FWD	Cooke	34 min
May 1, 6:50 AM CDT	Special Weather Statement	FWD	Stephens	25 min
May 1, 6:56 AM CDT	Severe Thunderstorm Warning	FWD	Eastland, Stephens, Young	64 min
May 1, 7:04 AM CDT	Severe Thunderstorm Warning	FWD	Collin, Cooke, Denton, Grayson	56 min
May 1, 7:09 AM CDT	Special Weather Statement	FWD	Fannin	36 min
May 1, 7:42 AM CDT	Severe Thunderstorm Warning	FWD	Lamar	26 min
May 1, 7:46 AM CDT	Severe Thunderstorm Warning	FWD	Eastland, Erath, Palo Pinto	44 min
May 1, 8:10 AM CDT	Special Weather Statement	FWD	Fannin	35 min
May 1, 8:21 AM CDT	Severe Thunderstorm Warning	FWD	Erath, Hood, Palo Pinto, Parker	54 min
May 1, 8:58 AM CDT	Severe Thunderstorm Warning	FWD	Tarrant	46 min
May 1, 10:08 AM CDT	Special Weather Statement	FWD	Wise	37 min
May 1, 10:21 AM CDT	Severe Thunderstorm Warning	FWD	Denton, Tarrant, Wise	54 min
May 1, 11:06 AM CDT	Special Weather Statement	FWD	Grayson	24 min
May 1, 11:37 AM CDT	Special Weather Statement	FWD	Grayson	38 min
May 1, 11:57 AM CDT	Severe Thunderstorm Warning	FWD	Grayson	42 min
May 1, 3:34 PM CDT	Special Weather Statement	FWD	Erath	56 min
May 1, 4:26 PM CDT	Special Weather Statement	FWD	Erath, Hood, Palo Pinto, Parker	64 min
May 1, 4:36 PM CDT	Severe Thunderstorm Warning	FWD	Erath, Hood, Palo Pinto, Parker	54 min
May 1, 4:52 PM CDT	Special Weather Statement	FWD	Van Zandt	23 min
May 1, 5:29 PM CDT	Severe Thunderstorm Warning	FWD	Denton, Parker, Tarrant, Wise	61 min
May 1, 6:26 PM CDT	Areal Flood Advisory	FWD	Cooke	3 hr

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.