Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 441, NWS Norman, OK

July 24, 2011Major County, Woods County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 24, 2011, 5:24 PM CDT for Major County, Woods County, Oklahoma. It was in force for 51 min. 1 report 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: Jul 24, 2011, 5:24 PM CDT (22:24 UTC)
Expired: Jul 24, 2011, 6:15 PM CDT
In force: 51 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Major County, OK, Woods County, OK

The radar

The Vance AFB radar (KVNX), 63 km from the middle of the area, began a volume at 22:26 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
Jul 24, 5:31 PM CDT	TSTM WND GST 60	9 Sse Waynoka, OK

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 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 nearest sounding before it

Lamont, OK (KLMN), launched 12:00Z, 10.4 hours before the alert went out and 114 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: 221 J/kg
Mixed-layer CIN: -213 J/kg
Mixed-layer LCL: 2405 m above ground
0-6 km bulk shear: 2 kt
0-1 km storm-relative helicity: -32 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.8

Open this sounding in Storm Lab

The text

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

713 
WUUS54 KOUN 242224
SVROUN
OKC093-151-242315-
/O.NEW.KOUN.SV.W.0441.110724T2224Z-110724T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
524 PM CDT SUN JUL 24 2011

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN MAJOR COUNTY IN NORTHWEST OKLAHOMA...
  SOUTHERN WOODS COUNTY IN NORTHWEST OKLAHOMA...

* UNTIL 615 PM CDT

* AT 524 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
  THUNDERSTORM 6 MILES SOUTH OF WAYNOKA...MOVING NORTHEAST AT 15 MPH.

HAZARDS IN THE WARNING INCLUDE...
DESTRUCTIVE WIND GUSTS TO 75 MPH...

* LOCATIONS IN THE WARNING INCLUDE WAYNOKA.

LAT...LON 3632 9855 3633 9896 3660 9897 3661 9882
      3669 9864
TIME...MOT...LOC 2224Z 246DEG 13KT 3650 9886

$$

1 follow-up statement

507 
WWUS54 KOUN 242243
SVSOUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
543 PM CDT SUN JUL 24 2011

OKC093-151-242315-
/O.CON.KOUN.SV.W.0441.000000T0000Z-110724T2315Z/
MAJOR OK-WOODS OK-
543 PM CDT SUN JUL 24 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM CDT
FOR SOUTHERN WOODS AND NORTHWESTERN MAJOR COUNTIES...

AT 543 PM CDT...NATIONAL WEATHER SERVICE RADAR DETECTED A SEVERE
THUNDERSTORM 4 MILES SOUTHEAST OF WAYNOKA...MOVING NORTHEAST AT 15
MPH.

HAZARDS IN THE WARNING INCLUDE...
DESTRUCTIVE WIND GUSTS TO 75 MPH...

* LOCATIONS IN THE WARNING INCLUDE WAYNOKA.

LAT...LON 3632 9855 3633 9896 3660 9897 3661 9882
      3669 9864
TIME...MOT...LOC 2243Z 246DEG 13KT 3654 9883

$$

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 Jul 24, 3:00 PM CDT, 2 hours 24 minutes earlier.

Area forecast discussion, Jul 24, 3:00 PM CDT, 2 hours 24 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
300 PM CDT SUN JUL 24 2011

.DISCUSSION...
SEVERAL WEAK SURFACE BOUNDARIES OVER NORTHERN OK THIS AFTERNOON ARE
AIDING THE DEVELOPMENT OF A FEW MORE SHOWERS AND SMALL T-STORMS.
MEANWHILE... A WEAK SYNOPTIC FRONT EXTENDED FROM NE KS INTO WESTERN
KS. WHILE SOME OF THE AFTERNOON ACTIVITY WILL GO AWAY BY EARLY EVENING...
THERE IS SOME SUPPORT TO MAINTAIN A CHANCE OF SHOWERS AND
T-STORMS OVERNIGHT. BOTH THE GFS AND NAM ARE SUGGESTING THE
DEVELOPMENT OF AN MCS FEATURE OVER EASTERN KS TONIGHT... WITH THE
GFS GENERATING A SECOND MCS FARTHER TO THE WEST. AN MCV TYPE
STRUCTURE MOVING THROUGH THE WESTERN OK PANHANDLE HAS BEEN
GENERATING SOME LIFT AS EVIDENCED BY INCREASED CLOUD COVER ON
SATELLITE. THIS FEATURE MAY BE THE SOURCE OF THE SECOND CONVECTIVE
SYSTEM GENERATED BY THE GFS. ADDITIONAL SUPPORT FOR ACTIVITY MAY
ALSO COME FROM AN UPPER WAVE ROTATING AROUND THE EAST SIDE OF THE
UPPER RIDGE... CENTERED WEST OF THE AREA... WHICH INTERACTS WITH
THE SURFACE FRONT/OUTLFOW BOUNDARIES. WILL GO WITH CHANCE CATEGORY
POPS TONIGHT ACROSS PARTS OF NORTHERN OKLAHOMA... DECREASING TO
ISOLATED IN CENTRAL SECTIONS.

LEFT OVER BOUNDARIES OVER NORTHERN OKLAHOMA COULD STILL ACT AS A
FOCUS FOR A FEW SHOWERS AND STORMS IN THE AREA ON MONDAY.

IN THE LONGER TERM... THE CONTINUED PRESENCE OF THE UPPER RIDGE
OVER THE REGION WILL MAINTAIN WEAK FLOW ALOFT ALONG WITH GENERALLY
HOT AND DRY WEATHER THROUGH MUCH OF THE WEEK. MODELS STILL
INDICATING A WEAKNESS DEVELOPING IN THE RIDGE OVER SE OK AROUND
THURSDAY WHICH MIGHT ALLOW A STORM OR TWO TO DEVELOP BUT MOST OF
THE ACTIVITY WILL LIKELY BE EAST OF THE FA.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  77 103  78 102 /  10  10  10  10
HOBART OK         80 104  80 105 /  10  10  10  10
WICHITA FALLS TX  81 106  81 107 /  10  10  10  10
GAGE OK           76 102  75 103 /  20  10  10  10
PONCA CITY OK     79 101  78 104 /  30  20  10  10
DURANT OK         80 102  80 101 /  10  10  10  10

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...HEAT ADVISORY UNTIL 10 PM CDT TUESDAY FOR OKZ004>048-050>052.

TX...HEAT ADVISORY UNTIL 10 PM CDT TUESDAY FOR TXZ083>090.

&&

03/32

Hazardous weather outlook, Jul 24, 11:55 AM CDT, 5 hours 29 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1155 AM CDT SUN JUL 24 2011

OKZ004>048-050>052-TXZ083>090-251000-
HARPER-WOODS-ALFALFA-GRANT-KAY-ELLIS-WOODWARD-MAJOR-GARFIELD-NOBLE-
ROGER MILLS-DEWEY-CUSTER-BLAINE-KINGFISHER-LOGAN-PAYNE-BECKHAM-
WASHITA-CADDO-CANADIAN-OKLAHOMA-LINCOLN-GRADY-MCCLAIN-CLEVELAND-
POTTAWATOMIE-SEMINOLE-HUGHES-HARMON-GREER-KIOWA-JACKSON-TILLMAN-
COMANCHE-STEPHENS-GARVIN-MURRAY-PONTOTOC-COAL-COTTON-JEFFERSON-
CARTER-JOHNSTON-ATOKA-LOVE-MARSHALL-BRYAN-HARDEMAN-FOARD-WILBARGER-
WICHITA-KNOX-BAYLOR-ARCHER-CLAY-
1155 AM CDT SUN JUL 24 2011

THIS HAZARDOUS WEATHER OUTLOOK COVERS NORTHERN...WESTERN...
CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH TEXAS.

.DAY ONE...THIS AFTERNOON AND TONIGHT...

THUNDERSTORM OUTLOOK...
ISOLATED TO SCATTERED THUNDERSTORMS ARE EXPECTED ACROSS MAINLY
NORTHERN OKLAHOMA THIS AFTERNOON AND TONIGHT.

DISCUSSION...
A COLD FRONT LOCATED FROM WEST CENTRAL INTO NORTHEAST KANSAS AT NOON
WILL MOVE SLOWLY SOUTH TODAY AND IS EXPECTED TO BE LOCATED ACROSS
SOUTHERN KANSAS BY LATE THIS AFTERNOON. THIS FRONT WILL BE THE FOCUS
FOR SCATTERED SHOWER AND THUNDERSTORM DEVELOPMENT. A FEW OF THESE
STORMS WILL LIKELY AFFECT NORTHERN OKLAHOMA THIS AFTERNOON AND
EVENING. THE COLD FRONT AND OTHER SURFACE BOUNDARIES GENERATED BY
THE THUNDERSTORM ACTIVITY ARE EXPECTED TO MOVE INTO NORTHERN
OKLAHOMA... WITH ADDITIONAL THUNDERSTORM DEVELOPMENT POSSIBLE
OVERNIGHT. ALTHOUGH INSTABILITY WILL BE LIMITED... HOT SURFACE
TEMPERATURES AND HIGH CLOUD BASES WILL BE CONDUCIVE FOR THESE STORMS
TO PRODUCE STRONG TO LOCALLY DAMAGING WIND GUSTS THIS AFTERNOON AND
EARLY THIS EVENING.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT MONDAY JUL 25.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...70 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...20 PERCENT.

OTHER HAZARDOUS WEATHER...
THE LIKELIHOOD OF HEAT ILLNESS GROWS WITH EACH WARM NIGHT AND HOT
DAY THAT PASSES. A HEAT ADVISORY REMAINS IN EFFECT.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY...

THUNDERSTORM OUTLOOK...
SURFACE BOUNDARIES WILL PROVIDE AT LEAST A LOW CHANCE OF
THUNDERSTORMS IN NORTHERN OKLAHOMA THROUGH MONDAY. GIVEN THE VERY
HOT AIR BENEATH CLOUD BASE HEIGHT...THERE WILL BE POTENTIAL FOR
ISOLATED SEVERE WIND GUSTS. THE PERSISTENT UPPER LEVEL RIDGE WILL
LIMIT INSTABILITY...RESULTING IN RELATIVELY FEW STORMS OF SHORT
DURATION.

OTHER HAZARDOUS WEATHER...
DANGEROUS HEAT WILL PERSIST. A HEAT ADVISORY REMAINS IN EFFECT
THROUGH TUESDAY. WILDFIRE POTENTIAL WILL ALSO REMAIN HIGH.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED BY 5 AM
MONDAY.

In the hours before

Special weather statement, Jul 24, 4:22 PM CDT, 1 hour 2 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
422 PM CDT SUN JUL 24 2011

OKZ004-242200-
HARPER OK-
422 PM CDT SUN JUL 24 2011

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR HARPER COUNTY.

AT 418 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 9 MILES SOUTH OF
SELMAN...MOVING EAST AT 10 MPH. THOUGH ONLY LIGHT AMOUNTS OF RAIN
WILL BE RECEIVED AT MOST LOCATIONS... VERY STRONG WIND GUSTS COULD
AFFECT AREAS SOUTH OF SELMAN ALONG HIGHWAY 34.

HAZARDS INCLUDE...
WIND GUSTS TO 50 MPH...

LAT...LON 3660 9932 3659 9943 3659 9959 3683 9963
      3686 9932

Special weather statement, Jul 24, 4:33 PM CDT, 51 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
433 PM CDT SUN JUL 24 2011

OKZ015-017-242215-
BLAINE OK-DEWEY OK-
433 PM CDT SUN JUL 24 2011

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR BLAINE AND DEWEY COUNTIES.

AT 433 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 5 MILES SOUTHWEST
OF CANTON...MOVING EAST AT 10 MPH.

HAZARDS INCLUDE...
WIND GUSTS TO 50 MPH...

LAT...LON 3616 9846 3594 9842 3595 9872 3606 9873

Special weather statement, Jul 24, 4:51 PM CDT, 33 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
451 PM CDT SUN JUL 24 2011

OKZ005-010-242230-
WOODWARD OK-WOODS OK-
451 PM CDT SUN JUL 24 2011

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR WOODS AND WOODWARD COUNTIES.

AT 449 PM CDT...STRONG THUNDERSTORMS WERE LOCATED OVER ALABASTER
CAVERNS STATE PARK AND ABOUT 10 MILES NORTHWEST OF
MOORELAND...MOVING NORTHEAST AT 10 MPH. STRONG WINDS ARE EXPECTED IN
ALABASTER CAVERNS STATE PARK AND ALONG HIGHWAY 50. BRIEF HEAVY
DOWNPORS CAN ALSO BE EXPECTED.

HAZARDS INCLUDE...
WIND GUSTS TO 55 MPH...

LAT...LON 3681 9900 3653 9896 3653 9934 3660 9933
      3660 9930 3670 9930 3679 9927

Special weather statement, Jul 24, 5:04 PM CDT, 20 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
504 PM CDT SUN JUL 24 2011

OKZ017-242245-
BLAINE OK-
504 PM CDT SUN JUL 24 2011

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR BLAINE COUNTY.

AT 504 PM CDT...A STRONG THUNDERSTORM WAS LOCATED OVER SOUTHARD...
MOVING EAST AT 10 MPH.

HAZARDS INCLUDE...
WIND GUSTS TO 55 MPH...

LAT...LON 3596 9822 3596 9851 3614 9856 3617 9829
      3617 9822

Local storm report, Jul 24, 5:13 PM CDT, 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
513 PM CDT SUN JUL 24 2011

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

0455 PM     TSTM WND GST     3 SSW FREEDOM           36.73N 99.13W
07/24/2011  M90 MPH          WOODWARD           OK   MESONET

            VIA OK MESONET

&&

DW

Special weather statement, Jul 24, 5:13 PM CDT, 11 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
513 PM CDT SUN JUL 24 2011

OKZ006-007-242300-
GRANT OK-ALFALFA OK-
513 PM CDT SUN JUL 24 2011

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR ALFALFA AND GRANT COUNTIES.

AT 514 PM CDT...A STRONG THUNDERSTORM WAS LOCATED 4 MILES NORTHWEST
OF NASH...MOVING NORTHEAST AT 10 MPH.

HAZARDS INCLUDE...
WIND GUSTS TO 55 MPH...

LAT...LON 3681 9794 3662 9791 3661 9816 3675 9821

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 7:16 PM CDT	Special Weather Statement	OUN	Alfalfa	44 min
Jul 23, 7:23 PM CDT	Special Weather Statement	OUN	Woods	37 min
Jul 24, 2:16 PM CDT	Special Weather Statement	OUN	Harper	29 min
Jul 24, 2:38 PM CDT	Special Weather Statement	OUN	Major	22 min
Jul 24, 2:47 PM CDT	Special Weather Statement	OUN	Woods	28 min
Jul 24, 3:09 PM CDT	Special Weather Statement	OUN	Harper	36 min
Jul 24, 3:40 PM CDT	Special Weather Statement	OUN	Woods	35 min
Jul 24, 3:45 PM CDT	Special Weather Statement	OUN	Harper	30 min
Jul 24, 4:15 PM CDT	Special Weather Statement	OUN	Woods	45 min
Jul 24, 4:22 PM CDT	Special Weather Statement	OUN	Harper	38 min
Jul 24, 4:33 PM CDT	Special Weather Statement	OUN	Blaine	42 min
Jul 24, 4:51 PM CDT	Special Weather Statement	OUN	Woods	39 min
Jul 24, 5:01 PM CDT	Severe Thunderstorm Warning	OUN	Woods, Woodward	59 min
Jul 24, 5:04 PM CDT	Special Weather Statement	OUN	Blaine	41 min
Jul 24, 5:12 PM CDT	Severe Thunderstorm Warning	OUN	Woodward	38 min
Jul 24, 5:13 PM CDT	Special Weather Statement	OUN	Alfalfa	47 min
Jul 24, 5:18 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Grant	46 min
Jul 24, 5:32 PM CDT	Special Weather Statement	OUN	Hughes	43 min
Jul 24, 5:48 PM CDT	Special Weather Statement	OUN	Kingfisher	42 min
Jul 24, 6:02 PM CDT	Special Weather Statement	OUN	Hughes	43 min
Jul 24, 6:19 PM CDT	Special Weather Statement	OUN	Dewey, Major	41 min
Jul 24, 6:21 PM CDT	Special Weather Statement	OUN	Garvin	39 min
Jul 24, 6:23 PM CDT	Special Weather Statement	OUN	Kay	37 min
Jul 24, 6:46 PM CDT	Special Weather Statement	OUN	Hughes	29 min
Jul 24, 6:56 PM CDT	Special Weather Statement	OUN	Lincoln	34 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 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.