Alert archive / Texas / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 299, NWS Norman, OK

May 29, 2012Wichita County, Wilbarger County, Texas; Cotton County, Tillman County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 29, 2012, 6:06 PM CDT for Wichita County, Wilbarger County, Texas; Cotton County, Tillman County, Oklahoma. It was in force for 54 min. 4 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 29, 2012, 6:06 PM CDT (23:06 UTC)
Expired: May 29, 2012, 7:00 PM CDT
In force: 54 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Cotton County, OK, Tillman County, OK, Wichita County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 21 km from the middle of the area, began a volume at 23:06 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 29, 6:22 PM CDT	HAIL 1.5	6 E Davidson, OK
May 29, 6:35 PM CDT	HAIL 1.75	Haynesville, TX
May 29, 7:05 PM CDT	HAIL 1.5	Electra, TX
May 29, 7:10 PM CDT	HAIL 1	S Electra, TX	THE HAIL WAS REPORTED ON THE SOUTH SIDE OF TOWN.

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 2 storm reports to this severe thunderstorm warning; the first came 16 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 29, 3:55 PM CDT	Severe Thunderstorm Watch	SPC	12 hr

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 11.1 hours before the alert went out and 184 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: 96 J/kg
Mixed-layer CIN: -476 J/kg
Mixed-layer LCL: 1922 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 101 m²/s²
0-3 km storm-relative helicity: 131 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

855 
WUUS54 KOUN 292306
SVROUN
OKC033-141-TXC485-487-300000-
/O.NEW.KOUN.SV.W.0299.120529T2306Z-120530T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
606 PM CDT TUE MAY 29 2012

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME SOUTHWESTERN COTTON COUNTY IN SOUTHWEST OKLAHOMA...
  TILLMAN COUNTY IN SOUTHWEST OKLAHOMA...
  WICHITA COUNTY IN NORTHERN TEXAS...
  EXTREME NORTHEASTERN WILBARGER COUNTY IN NORTHERN TEXAS...

* UNTIL 700 PM CDT

* AT 601 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED 
  A SEVERE THUNDERSTORM CAPABLE OF PRODUCING LARGE DAMAGING HAIL UP 
  TO GOLF BALL SIZE AND DAMAGING WINDS IN EXCESS OF 65 MPH. THIS 
  STORM WAS LOCATED 10 MILES SOUTHEAST OF DAVIDSON...MOVING 
  SOUTHEAST AT 20 MPH. 

* LOCATIONS IMPACTED INCLUDE...
  ELECTRA...GRANDFIELD...DAVIDSON...DEVOL...LOVELAND...HARROLD...
  OKLAUNION AND HAYNESVILLE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE INSIDE A STURDY BUILDING UNTIL THE STORM HAS PASSED.

&&

LAT...LON 3416 9922 3435 9912 3429 9851 3392 9872
TIME...MOT...LOC 2301Z 293DEG 16KT 3420 9900 

$$

MAXWELL

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 29, 3:11 PM CDT, 2 hours 55 minutes earlier.

Area forecast discussion, May 29, 3:11 PM CDT, 2 hours 55 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
311 PM CDT TUE MAY 29 2012

.DISCUSSION...
SFC LOW IS POSITIONED OVER NE TX PANHANDLE WITH WARM FRONT EXTENDING
ACROSS THE OK/KS BORDER AND A DRYLINE EXTENDING SOUTH ACROSS WESTERN
OK. THESE BOUNDARIES AND TRIPLE POINT COULD BE FOCUS FOR CONVECTION
LATER THIS AFTERNOON AND THIS EVENING WITH THE BEST CHANCES ALONG
THE FRONT AND NEAR THE TRIPLE POINT. THIS ACTIVITY IS EXPECTED TO
THEN CONGEAL INTO ONE OR MORE STORM COMPLEXES THAT MOVE ACROSS THE
FA TONIGHT WITH THE BEST CHANCE ACROSS NORTH CENTRAL/CENTRAL OK.
SOME OF THE STORMS WILL BECOME SEVERE PRODUCING LARGE HAIL AND
DAMAGING WIND GUSTS.

ANOTHER ROUND OF SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS IS
EXPECTED TO OCCUR WEDNESDAY AFTN/NIGHT. A SHORTWAVE WILL MOVE ACROSS
THE REGION WEDNESDAY/THURSDAY PROVIDING SOME UPPER SUPPORT THAT IS
LACKING FOR TODAY. A COLD FRONT WILL ALSO MOVE ACROSS THE REGION
LATE WEDNESDAY INTO THURSDAY. SOME OF THE STORMS WILL LIKELY BECOME
SEVERE. LOCALLY HEAVY RAIN COULD ALSO BECOME AN ISSUE IN SOME AREAS.

COOLER AIR IS EXPECTED TO MOVE INTO THE REGION BEHIND THE FRONT
LEADING TO BELOW NORMAL TEMPERATURES FOR ABOUT THE LATTER HALF OF
THE WEEK. TEMPERATURES WILL WARM TO AOA NORMAL OVER THE WEEKEND INTO
EARLY NEXT WEEK. RIGHT NOW THE FORECAST IS DRY AFTER THURSDAY BUT
WITH RETURNING MOISTURE AND NW FLOW FOR AT LEAST THE LAST HALF OF
THE WORK WEEK SOME ADDITIONAL STORMS CAN NOT BE RULED OUT.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  70  88  64  77 /  50  30  70  20
HOBART OK         69  90  63  80 /  40  30  50  10
WICHITA FALLS TX  72  93  65  85 /  30  20  40  20
GAGE OK           65  82  61  75 /  30  40  50  10
PONCA CITY OK     65  82  60  73 /  60  50  80  20
DURANT OK         72  88  70  83 /  40  30  70  40

&&

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

17/25

Hazardous weather outlook, May 29, 12:06 PM CDT, 6 hours before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1206 PM CDT TUE MAY 29 2012

OKZ004>048-050>052-TXZ083>090-301000-
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-
1206 PM CDT TUE MAY 29 2012

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

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

THUNDERSTORM OUTLOOK...
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS LATE THIS
AFTERNOON AND EVENING ACROSS OKLAHOMA AND WESTERN NORTH TEXAS.

LOCATION...
THE SLIGHT RISK AREA COVERS ALL COUNTIES IN OKLAHOMA AND WESTERN
NORTH TEXAS COVERED BY NWS NORMAN.

TIMING...
THE MOST LIKELY TIME FOR SEVERE THUNDERSTORMS WILL BE FROM 4 PM
THROUGH MIDNIGHT CDT.

RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE
RISK AREA SHOULD PLAN FOR SEVERE WEATHER OPERATIONS LATE THIS
AFTERNOON AND EVENING.

IMPACTS...
HAIL LARGER THAN TWO INCHES IN DIAMETER WILL BE THE MAIN
HAZARD...CAUSING DAMAGE TO ROOFS...CROPS AND CARS.

DAMAGING WIND GUSTS OVER 65 MPH WILL ALSO BE POSSIBLE...CAUSING
DAMAGE TO STRUCTURES...TREES AND UTILITY LINES.

DISCUSSION...
SURFACE LOW PRESSURE WILL DEEPEN THIS AFTERNOON OVER THE
NORTHEASTERN TEXAS PANHANDLE. AS THIS OCCURS...A WARM FRONT WILL
MOVE NORTH AND REACH THE KANSAS OKLAHOMA BORDER REGION BY 6 PM CDT.
A DRYLINE WILL BE SITUATED ACROSS WESTERN OKLAHOMA AND WESTERN
NORTH TEXAS...SHARPENING THROUGH THE AFTERNOON. AMPLE MOISTURE
AND RISING TEMPERATURES WILL LEAD TO A HIGHLY UNSTABLE WARM SECTOR
OVER OKLAHOMA AND NORTH TEXAS THIS AFTERNOON AND EVENING.

STRONG SURFACE HEATING WILL WEAKEN INHIBITION...ALLOWING FOR
ISOLATED TO SCATTERED THUNDERSTORM DEVELOPMENT BETWEEN
4 AND 7 PM CDT. THIS WILL LIKELY OCCUR FIRST NEAR THE OKLAHOMA
KANSAS LINE OR ALONG THE DRYLINE IN WESTERN OKLAHOMA. STORMS WILL
MOVE EAST AND SOUTHEAST LATE THIS AFTERNOON AND EVENING.

INITIAL STORMS WILL POSE A THREAT OF VERY LARGE HAIL AND DAMAGING
WINDS. STORMS MAY GROW INTO A COMPLEX AFTER 7 PM CDT...POSING
MAINLY A DAMAGING WIND THREAT MAINLY NORTHEAST OF A WOODWARD TO
DURANT LINE. ALTHOUGH A FEW SEVERE STORMS CANNOT BE RULED OUT
AFTER MIDNIGHT...MUCH OF THE SEVERE POTENTIAL WILL DIMINISH.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT WEDNESDAY MAY 30.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...90 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...90 PERCENT.

OTHER HAZARDOUS WEATHER...
LOCALLY HEAVY RAIN MAY OCCUR WITH THUNDERSTORMS LATE
THIS AFTERNOON AND TONIGHT.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY...

THUNDERSTORM OUTLOOK...
WIDESPREAD AND POSSIBLY SIGNIFICANT SEVERE WEATHER IS ANTICIPATED
ON WEDNESDAY AS LARGE INSTABILITY AND A LOW PRESSURE DISTURBANCE
CONTRIBUTE TO SCATTERED TO NUMEROUS THUNDERSTORMS DURING THE
LATE AFTERNOON AND EVENING HOURS. LARGE HAIL AND DAMAGING WINDS
WILL BE THE MAIN HAZARDS...THOUGH A TORNADO OR TWO MAY ALSO OCCUR.

STORMS MAY LINGER INTO THURSDAY WITH A CONTINUED THREAT OF
DAMAGING WINDS DURING THE MORNING HOURS.

BY THURSDAY AFTERNOON...STORM CHANCES DECREASE WITH A RELATIVELY
DRY PATTERN SETTING UP THROUGH THE WEEKEND.

OTHER HAZARDOUS WEATHER...
LOCALLY HEAVY RAIN MAY OCCUR WITH THUNDERSTORMS WEDNESDAY INTO
THURSDAY MORNING.

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

AUSTIN/MBS/MAXWELL

In the hours before

Local storm report, May 29, 5:27 PM CDT, 39 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
527 PM CDT TUE MAY 29 2012

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

0523 PM     HAIL             2 ENE HEADRICK          34.64N 99.10W
05/29/2012  E1.25 INCH       TILLMAN            OK   TRAINED SPOTTER

            THE HAIL WAS REPORTED ON HWY 62... ONE MILE EAST OF THE
            TILLMAN COUNTY LINE.

0522 PM     HAIL             3 N OKEENE              36.16N 98.32W
05/29/2012  E1.50 INCH       BLAINE             OK   TRAINED SPOTTER

&&

NWS NORMAN

Local storm report, May 29, 5:34 PM CDT, 32 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
534 PM CDT TUE MAY 29 2012

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

0533 PM     HAIL             3 N OKEENE              36.16N 98.32W
05/29/2012  E2.00 INCH       BLAINE             OK   TRAINED SPOTTER

&&

NWS NORMAN

Local storm report, May 29, 5:39 PM CDT, 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
539 PM CDT TUE MAY 29 2012

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

0535 PM     HAIL             2 W DAVIDSON            34.24N 99.11W
05/29/2012  E1.75 INCH       TILLMAN            OK   AMATEUR RADIO

&&

NWS NORMAN

Local storm report, May 29, 5:47 PM CDT, 19 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
547 PM CDT TUE MAY 29 2012

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

0545 PM     HAIL             2 W JET                 36.67N 98.22W
05/29/2012  E1.75 INCH       ALFALFA            OK   STORM CHASER

&&

NWS NORMAN

Local storm report, May 29, 5:59 PM CDT, 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
559 PM CDT TUE MAY 29 2012

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

0556 PM     HAIL             3 N MANITOU             34.55N 98.98W
05/29/2012  E1.75 INCH       TILLMAN            OK   BROADCAST MEDIA

            ALONG TILLMAN COUNTY LINE ALONG HIGHWAY 183

&&

NWS NORMAN

Local storm report, May 29, 6:01 PM CDT, 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
601 PM CDT TUE MAY 29 2012

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

0601 PM     HAIL             2 W LACEY               36.12N 98.12W
05/29/2012  E2.75 INCH       KINGFISHER         OK   STORM CHASER

&&

NWS NORMAN

The office that day

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

Issued	Product	Office	Counties	Lasted
May 28, 7:02 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Clay	58 min
May 28, 7:29 PM CDT	Severe Thunderstorm Warning	OUN	Clay	46 min
May 28, 7:54 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Clay	66 min
May 29, 5:21 PM CDT	Severe Thunderstorm Warning	OUN	Wilbarger	54 min
May 28, 7:00 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Grady, Stephens	45 min
May 28, 7:08 PM CDT	Special Weather Statement	OUN	Cleveland	22 min
May 28, 7:19 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Garvin, McClain, Pottawatomie	41 min
May 28, 7:40 PM CDT	Special Weather Statement	OUN	Logan	35 min
May 28, 7:41 PM CDT	Special Weather Statement	OUN	Carter, Love	34 min
May 28, 7:43 PM CDT	Severe Thunderstorm Warning	OUN	Grady	32 min
May 28, 7:58 PM CDT	Severe Thunderstorm Warning	OUN	Payne	47 min
May 28, 8:00 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, McClain	45 min
May 28, 8:12 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Grady, McClain	48 min
May 28, 8:15 PM CDT	Special Weather Statement	OUN	Logan	30 min
May 28, 8:30 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Kingfisher, Logan	45 min
May 28, 8:39 PM CDT	Special Weather Statement	OUN	Love	36 min
May 28, 8:45 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Payne	60 min
May 28, 9:11 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Kingfisher, Logan, Oklahoma	49 min
May 28, 9:15 PM CDT	Special Weather Statement	OUN	Marshall	30 min
May 28, 9:29 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln	61 min
May 28, 9:57 PM CDT	Severe Thunderstorm Warning	OUN	Canadian	22 min
May 28, 10:40 PM CDT	Special Weather Statement	OUN	Lincoln	35 min
May 28, 10:54 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln	24 min
May 28, 11:20 PM CDT	Special Weather Statement	OUN	Atoka, Bryan, Carter, Johnston, Love, Marshall	25 min
May 28, 11:54 PM CDT	Special Weather Statement	OUN	Atoka, Bryan, Johnston, Love, Marshall	51 min
May 29, 12:41 AM CDT	Special Weather Statement	OUN	Atoka, Bryan, Marshall	49 min
May 29, 4:37 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Woods	53 min
May 29, 4:51 PM CDT	Special Weather Statement	OUN	Kiowa	24 min
May 29, 5:10 PM CDT	Special Weather Statement	OUN	Kiowa	35 min
May 29, 5:12 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Jackson, Kiowa, Tillman	63 min
May 29, 5:14 PM CDT	Special Weather Statement	OUN	Tillman	31 min
May 29, 5:26 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Grant	64 min
May 29, 5:28 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Blaine, Garfield, Grant, Kingfisher, Major	62 min
May 29, 5:40 PM CDT	Severe Thunderstorm Warning	OUN	Harper, Woods	65 min
May 29, 5:47 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Grant	43 min
May 29, 6:09 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Cotton, Kiowa, Tillman	66 min
May 29, 6:26 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Blaine, Garfield, Grant, Kingfisher, Logan and 1 more	64 min
May 29, 6:34 PM CDT	Special Weather Statement	OUN	Alfalfa	26 min
May 29, 6:39 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Harper, Woods, Woodward	55 min
May 29, 6:43 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Grady	47 min
May 29, 6:51 PM CDT	Severe Thunderstorm Warning	OUN	Grant	54 min
May 29, 6:54 PM CDT	Special Weather Statement	OUN	Kay	36 min
May 29, 6:55 PM CDT	Special Weather Statement	OUN	Noble, Payne	35 min

Nearby

Severe Thunderstorm Warnings in Texas, 2012 Severe Thunderstorm Warnings in Oklahoma, 2012 Every severe thunderstorm warning in 2012

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.