Alert archive / Texas / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 130, NWS Norman, OK

May 1, 2011Archer County, Baylor County, Clay County, Texas

NWS Norman, OK issued this severe thunderstorm warning at May 1, 2011, 4:32 AM CDT for Archer County, Baylor County, Clay County, Texas. It was in force for 58 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
May 1, 2011, 4:32 AM CDT (09:32 UTC)
Expired
May 1, 2011, 5:30 AM CDT
In force
58 min
Issued by
NWS Norman, OK
Area
Storm-based polygon

Counties Archer County, TX, Baylor County, TX, Clay County, TX

The radar

The Altus AFB radar (KFDR), 81 km from the middle of the area, began a volume at 09:33 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.

IssuedProductOfficeLasted
May 1, 1:40 AM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 9.5 hours before the alert went out and 161 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-pSkew-T log-p diagram, Fort Worth, TX at 00:00Z on 2011-05-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 277 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Worth, TX at 00:00Z on 2011-05-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 97 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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

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 Norman, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at May 1, 3:01 AM CDT, 1 hour 31 minutes earlier.

Area forecast discussion, May 1, 3:01 AM CDT, 1 hour 31 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
301 AM CDT SUN MAY 1 2011

.DISCUSSION...
SHOWERS AND A FEW THUNDERSTORMS ARE EXPECTED TO EXPAND NORTH AND
EAST ACROSS OKLAHOMA THIS MORNING. AN UPPER WAVE APPROACHING FROM
EASTERN NEW MEXICO EARLY THIS MORNING AND VERY MUCH MOISTURE
MOVING NORTH OF THE FRONT WHICH LAY ACROSS NORTH CENTRAL TEXAS
THIS MORNING ARE FAVORABLE FACTORS. LESS THUNDER WILL BE HEARD IN
CENTRAL AND NORTHERN OKLAHOMA. THE RAIN TODAY WILL BE MODULATED
MOSTLY BY THE PATH OF THE UPPER STORM WHICH IS EXPECTED TO MOVE
ACROSS OKLAHOMA THIS AFTERNOON AND BRING AN END TO THE SHOWERS
WEST TO EAST. HOWEVER, THE SYNOPTIC-SCALE UPPER TROUGH WILL NOT
PASS ACROSS OKLAHOMA UNTIL LATER MONDAY, SO CHANCE FOR RAIN
INCREASE AGAIN THEN, HIGHEST IN SOUTHEAST OKLAHOMA. WITH BROAD
MID-LEVEL LIFT AND MOISTURE, CLOUDS WILL DEVELOP ACROSS MOST AREAS
THROUGH MONDAY GIVING COOL CONDITIONS. AFTER A TRANSIENT AND WEAK
UPPER RIDGE TUESDAY AND WEDNESDAY, A FASTER AND WEAKER TROUGH IN
THE CENTRAL PLAINS IS EXPECTED TO MOVE A WEAK FRONT INTO OKLAHOMA
LATE IN THE WEEK. RAIN CHANCES REMAIN LOW WITH THIS SYSTEM.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  56  40  59  37 /  50  20  30  10
HOBART OK         56  37  60  32 /  30  30  20  10
WICHITA FALLS TX  61  43  57  37 /  50  50  50  10
GAGE OK           54  31  64  31 /  30  10  10  10
PONCA CITY OK     56  34  64  36 /  40  20  10  10
DURANT OK         60  45  54  42 / 100  60  70  30

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...NONE.
TX...NONE.
&&

22/09
Hazardous weather outlook, May 1, 2:26 AM CDT, 2 hours 6 minutes before
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In the hours before

Special weather statement, May 1, 2:41 AM CDT, 1 hour 51 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
241 AM CDT SUN MAY 1 2011

TXZ087-010800-
KNOX TX-
241 AM CDT SUN MAY 1 2011

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR KNOX COUNTY.

AT 242 AM CDT...A STRONG THUNDERSTORM WAS LOCATED 17 MILES SOUTHWEST
OF BENJAMIN...MOVING NORTHEAST AT 25 MPH.

HAZARDS INCLUDE...
HAIL UP TO ONE-HALF INCH...

MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING
WEATHER CONDITIONS.

LAT...LON 3341 10000 3363 10000 3374 9983 3356 9968
      3352 9974 3340 9999

WR
Special weather statement, May 1, 3:02 AM CDT, 1 hour 30 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
302 AM CDT SUN MAY 1 2011

TXZ084-087-010830-
FOARD TX-KNOX TX-
302 AM CDT SUN MAY 1 2011

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR FOARD AND KNOX COUNTIES.

AT 302 AM CDT...AN AREA OF DEVELOPING STRONG THUNDERSTORMS WAS
LOCATED FROM 8 MILES WEST OF TRUSCOTT TO 14 MILES SOUTHWEST OF
BENJAMIN...MOVING NORTHEAST AT 45 MPH.

HAZARDS INCLUDE...
HAIL UP TO ONE-HALF INCH...

MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING
WEATHER CONDITIONS.

LAT...LON 3340 10000 3348 10000 3379 9999 3410 9972
      3375 9951 3339 9994 3339 9998

WR

The office that day

Everything else NWS Norman, OK issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 1, 5:17 AM CDTSpecial Weather StatementOUNLove43 min
May 1, 5:28 AM CDTSevere Thunderstorm WarningOUNJefferson, Love62 min
May 1, 5:51 AM CDTSpecial Weather StatementOUNBryan, Marshall39 min
May 1, 6:15 AM CDTSevere Thunderstorm WarningOUNCarter, Jefferson, Johnston, Love, Marshall60 min
May 1, 6:27 AM CDTSevere Thunderstorm WarningOUNBryan48 min
May 1, 6:51 AM CDTSpecial Weather StatementOUNTillman24 min
May 1, 7:15 AM CDTSevere Thunderstorm WarningOUNAtoka, Bryan45 min
May 1, 7:19 AM CDTSpecial Weather StatementOUNCotton, Tillman41 min
May 1, 7:50 AM CDTSevere Thunderstorm WarningOUNBryan60 min
May 1, 8:31 AM CDTSpecial Weather StatementOUNCotton14 min
May 1, 8:48 AM CDTSpecial Weather StatementOUNCotton27 min
May 1, 9:12 AM CDTSpecial Weather StatementOUNStephens18 min
May 1, 9:18 AM CDTSpecial Weather StatementOUNComanche27 min
May 1, 9:25 AM CDTSpecial Weather StatementOUNGrady20 min
May 1, 9:40 AM CDTSpecial Weather StatementOUNMcClain20 min
May 1, 9:53 AM CDTSpecial Weather StatementOUNCleveland22 min
May 1, 11:09 AM CDTSpecial Weather StatementOUNCleveland, Garvin, McClain, Oklahoma21 min
May 1, 11:28 AM CDTSpecial Weather StatementOUNCarter, Cleveland, Garvin, McClain, Oklahoma32 min
May 1, 11:39 AM CDTSpecial Weather StatementOUNBryan36 min
May 1, 11:58 AM CDTSpecial Weather StatementOUNCleveland, Garvin, Lincoln, McClain, Murray, Pottawatomie32 min
May 1, 12:00 PM CDTSpecial Weather StatementOUNMarshall15 min
May 1, 12:08 PM CDTSevere Thunderstorm WarningOUNAtoka, Bryan, Marshall67 min
May 1, 12:23 PM CDTSpecial Weather StatementOUNCleveland, Garvin, Lincoln, McClain, Oklahoma, Payne and 2 more22 min
May 1, 12:52 PM CDTSpecial Weather StatementOUNCleveland, Garvin, Hughes, Lincoln, McClain, Oklahoma and 3 more23 min
May 1, 1:12 PM CDTSevere Thunderstorm WarningOUNAtoka, Bryan49 min
May 1, 3:45 PM CDTSpecial Weather StatementOUNMarshall15 min
May 1, 4:30 PM CDTSpecial Weather StatementOUNJohnston15 min
May 1, 4:47 PM CDTSpecial Weather StatementOUNMarshall28 min
May 1, 5:11 PM CDTSpecial Weather StatementOUNCoal, Johnston, Marshall34 min
May 1, 6:18 PM CDTSpecial Weather StatementOUNAtoka, Bryan27 min
May 1, 6:49 PM CDTAreal Flood AdvisoryOUNAtoka, Bryan3 hr
May 1, 6:56 PM CDTSpecial Weather StatementOUNAtoka, Bryan34 min
May 1, 2:41 AM CDTSpecial Weather StatementOUNKnox19 min
May 1, 3:02 AM CDTSpecial Weather StatementOUNFoard, Knox28 min
May 1, 3:34 AM CDTSevere Thunderstorm WarningOUNBaylor, Foard, Knox, Wilbarger56 min
May 1, 5:13 AM CDTSpecial Weather StatementOUNWichita17 min
May 1, 6:20 AM CDTSpecial Weather StatementOUNWilbarger25 min
May 1, 8:16 AM CDTSpecial Weather StatementOUNWichita14 min

Nearby

Severe Thunderstorm Warnings in Texas, 2011Every 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.