Alert archive / Texas / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 231, NWS Fort Worth, TX

May 1, 2011Montague County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at May 1, 2011, 5:30 AM CDT for Montague County, Texas. It was in force for 30 min. 2 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, 5:30 AM CDT (10:30 UTC)
Expired: May 1, 2011, 6:00 AM CDT
In force: 30 min
Issued by: NWS Fort Worth, TX
Area: Storm-based polygon

County Montague County, TX

The radar

The Altus AFB radar (KFDR), 129 km from the middle of the area, began a volume at 10:34 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, 5:40 AM CDT	HAIL 1	3 S Ringgold, TX
May 1, 6:01 AM CDT	HAIL 1	4 E Nocona, TX	QUARTER SIZE HAIL 4 MILES EAST OF NOCONA

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 one storm report to this severe thunderstorm warning; the first came 10 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, 10.5 hours before the alert went out and 122 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.

149 
WUUS54 KFWD 011030
SVRFWD
TXC337-011100-
/O.NEW.KFWD.SV.W.0231.110501T1030Z-110501T1100Z/

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

THE NATIONAL WEATHER SERVICE IN FORT WORTH HAS ISSUED A

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

* UNTIL 600 AM CDT

* AT 530 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 65 MPH.  THIS STORM WAS LOCATED 10
  MILES WEST OF STONEBURG...AND MOVING EAST AT 60 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  STONEBURG AROUND 535 AM
  NOCONA AROUND 545 AM

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO A STURDY SHELTER UNTIL THE STORM HAS
PASSED.

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

&&

LAT...LON 3394 9758 3392 9758 3391 9755 3385 9749
      3375 9748 3364 9797 3387 9797 3388 9792
      3386 9786 3389 9780 3394 9775 3398 9762
TIME...MOT...LOC 1030Z 252DEG 54KT 3373 9799

$$

2 follow-up statements

326 
WWUS54 KFWD 011052
SVSFWD

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

TXC337-011100-
/O.CON.KFWD.SV.W.0231.000000T0000Z-110501T1100Z/
MONTAGUE TX-
552 AM CDT SUN MAY 1 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 AM CDT
FOR NORTHERN MONTAGUE COUNTY...

AT 551 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 
NOCONA...MOVING EAST AT 60 MPH. QUARTER-SIZE HAIL FELL SOUTH OF 
RINGGOLD AT 540 AM. OTHER STRONG STORMS WILL ENTER WESTERN PORTIONS 
OF MONTAGUE COUNTY BY 6 AM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO A STURDY SHELTER UNTIL THE STORM HAS
PASSED.

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 3394 9758 3392 9758 3391 9755 3385 9749
      3375 9748 3364 9797 3387 9797 3388 9792
      3386 9786 3389 9780 3394 9775 3398 9762
TIME...MOT...LOC 1051Z 252DEG 54KT 3382 9770

$$

499 
WWUS54 KFWD 011059
SVSFWD

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

TXC337-011108-
/O.EXP.KFWD.SV.W.0231.000000T0000Z-110501T1100Z/
MONTAGUE TX-
559 AM CDT SUN MAY 1 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN MONTAGUE COUNTY
EXPIRES AT 600 AM CDT...

AT 558 AM CDT THE SEVERE THUNDERSTORM THAT PROMPTED THE WARNING
WEAKENED AND WAS NO LONGER SEVERE.

RADAR INDICATED THAT HEAVY RAIN...SMALL HAIL...AND GUSTY WINDS WERE 
STILL POSSIBLE FROM THUNDERSTORMS EAST OF NOCONA THROUGH 630 AM. IN 
ADDITION...STRONG STORMS OVER EASTERN CLASY COUNTY WILL MOVE EAST 
OVER MONTAGUE COUNTY BETWEEN 6 AM AND 7 AM.

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

LAT...LON 3394 9758 3392 9758 3391 9755 3385 9749
      3375 9748 3364 9797 3387 9797 3388 9792
      3386 9786 3389 9780 3394 9775 3398 9762
TIME...MOT...LOC 1058Z 252DEG 54KT 3385 9758

$$

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, 1 hour 30 minutes earlier.

Area forecast discussion, May 1, 4:00 AM CDT, 1 hour 30 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, 5 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, 4:47 AM CDT, 43 minutes before

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

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

0445 AM     HAIL             OVILLA                  32.53N  96.88W
05/01/2011  E1.00 INCH       ELLIS              TX   TRAINED SPOTTER

            QUARTER SIZE HAIL IN OVILLA

Local storm report, May 1, 4:50 AM CDT, 40 minutes before

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

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

0443 AM     HAIL             8 WNW ALVORD            33.41N  97.81W
05/01/2011  E1.25 INCH       WISE               TX   PUBLIC

            HALF DOLLAR SIZE HAIL 8 MILES WEST OF ALVORD

Local storm report, May 1, 4:59 AM CDT, 31 minutes before

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

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

0443 AM     TSTM WND GST     8 WNW ALVORD            33.41N  97.81W
05/01/2011  E65 MPH          WISE               TX   PUBLIC

            65 MPH WIND GUST 8 MILES WEST NORTHWEST OF ALVORD

Local storm report, May 1, 5:03 AM CDT, 27 minutes before

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

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

0450 AM     HAIL             DESOTO                  32.58N  96.85W
05/01/2011  E1.00 INCH       DALLAS             TX   TRAINED SPOTTER

            QUARTER SIZE HAIL IN DESOTO

Local storm report, May 1, 5:08 AM CDT, 22 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, 10 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

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, 5:46 AM CDT	Special Weather Statement	FWD	Grayson	29 min
May 1, 6:05 AM CDT	Severe Thunderstorm Warning	FWD	Grayson	25 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.