Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 350, NWS Norman, OK

May 30, 201213 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 30, 2012, 9:44 PM CDT for 13 counties in Oklahoma. It was in force for 61 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 30, 2012, 9:44 PM CDT (02:44 UTC)
Expired: May 30, 2012, 10:45 PM CDT
In force: 61 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Alfalfa County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Grant County, OK, Harper County, OK, Kay County, OK, Major County, OK, Noble County, OK, Payne County, OK, Roger Mills County, OK, Woods County, OK, Woodward County, OK

The radar

The Vance AFB radar (KVNX), 77 km from the middle of the area, began a volume at 02:44 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 30, 9:45 PM CDT	TSTM WND GST 62	2 S Alva, OK
May 30, 9:45 PM CDT	TSTM WND GST 63	7 Ssw Alva, OK
May 30, 9:47 PM CDT	TSTM WND GST 60	Newkirk, OK
May 30, 10:07 PM CDT	TSTM WND DMG	3 E Buffalo, OK	POWER POLES BLOWN DOWN. REPORTED BY HARPER COUNTY EMERGENCY MGT.
May 30, 10:55 PM CDT	TSTM WND GST 59	Vance Air Force Base, 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 4 storm reports to this severe thunderstorm warning; the first came 1 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 30, 6:13 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Lamont, OK (KLMN), launched 00:00Z, 2.7 hours before the alert went out and 19 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: 1367 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 1816 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 61 m²/s²
0-3 km storm-relative helicity: 158 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 3.2

Open this sounding in Storm Lab

The text

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

764 
WUUS54 KOUN 310244
SVROUN
OKC003-043-045-047-053-059-071-093-103-119-129-151-153-310345-
/O.NEW.KOUN.SV.W.0350.120531T0244Z-120531T0345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
944 PM CDT WED MAY 30 2012

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ALFALFA COUNTY IN NORTHWEST OKLAHOMA...
  NORTHWESTERN DEWEY COUNTY IN NORTHWEST OKLAHOMA...
  ELLIS COUNTY IN NORTHWEST OKLAHOMA...
  GARFIELD COUNTY IN NORTHERN OKLAHOMA...
  GRANT COUNTY IN NORTHERN OKLAHOMA...
  HARPER COUNTY IN NORTHWEST OKLAHOMA...
  KAY COUNTY IN NORTHERN OKLAHOMA...
  MAJOR COUNTY IN NORTHWEST OKLAHOMA...
  NOBLE COUNTY IN NORTHERN OKLAHOMA...
  EXTREME NORTH CENTRAL PAYNE COUNTY IN CENTRAL OKLAHOMA...
  EXTREME NORTHWESTERN ROGER MILLS COUNTY IN WESTERN OKLAHOMA...
  WOODS COUNTY IN NORTHWEST OKLAHOMA...
  WOODWARD COUNTY IN NORTHWEST OKLAHOMA...

* UNTIL 1045 PM CDT

* AT 939 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED 
  SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE HAIL AND   
  DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. THESE STORMS WERE LOCATED   
  ALONG THE NORTHERN BORDER OF OKLAHOMA...MOVING SOUTH AT 50 MPH.   
  THE STRONGEST WINDS ARE EXPECTED TO AFFECT THE NORTHWEST QUARTER   
  OF OKLAHOMA.

* LOCATIONS IMPACTED INCLUDE...
  ENID...PONCA CITY...WOODWARD...ALVA...BLACKWELL...PERRY...
  TONKAWA...FAIRVIEW...NEWKIRK...CHEROKEE...SHATTUCK...WAUKOMIS...
  MOORELAND...BUFFALO...MEDFORD...LAVERNE...WAYNOKA...POND CREEK...
  SEILING AND GARBER. 

THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 179 AND 235.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH NO WARNING.  GET 
TO A STORM SHELTER OR STURDY BUILDING IF A TORNADO APPROACHES.

MOVE INSIDE A STURDY BUILDING UNTIL THE STORM HAS PASSED.

&&

LAT...LON 3699 9676 3678 9675 3675 9689 3668 9695
      3670 9704 3666 9707 3659 9705 3658 9689
      3650 9704 3634 9703 3634 9693 3625 9693
      3624 9682 3617 9681 3615 9663 3621 9852
      3584 9998 3700 9999
TIME...MOT...LOC 0239Z 338DEG 42KT 3675 9884 

$$

CMS

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 30, 6:42 PM CDT, 3 hours 2 minutes earlier.

Area forecast discussion, May 30, 6:42 PM CDT, 3 hours 2 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
642 PM CDT WED MAY 30 2012

.AVIATION...
SCATTERED TSRA OVER W OK AND W NORTH TX WILL MOVE SE OR E THIS
EVENING...WHILE LARGE STORM CLUSTER OVER C KS ADVANCES TO THE S.
THESE SYSTEMS WILL...BY THE END OF THE NIGHT...AFFECT ALL OUR TAF
SITES...A FEW OF THEM MORE THAN ONCE. MANY OF THE STORMS WILL BE
SEVERE...AND THE STORM COMPLEX FROM KS WILL LIKELY BRING
WIDESPREAD STRONG WINDS OVERNIGHT TO MOST OF OUR TAF SITES. A FEW
MORE TSRA MAY ACCOMPANY THE COLD FRONT TOMORROW MORNING...AS MAY A
LAYER OF ST OR SC. CONDITIONS SHOULD IMPROVE AS THE FRONT ADVANCES
FARTHER TO THE S IN THE AFTERNOON.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  87  66  77  54 /  70  80  20  10
HOBART OK         93  66  80  53 /  40  50  10  10
WICHITA FALLS TX  96  70  85  54 /  40  50  20  10
GAGE OK           88  61  75  48 /  60  50  10  10
PONCA CITY OK     85  64  73  49 /  60  80  20  10
DURANT OK         91  69  83  54 /  70  60  50  10

&&

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

02/23/23

Hazardous weather outlook, May 30, 4:20 PM CDT, 5 hours 24 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
420 PM CDT WED MAY 30 2012

OKZ004>048-050>052-TXZ083>090-311000-
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-
420 PM CDT WED MAY 30 2012

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

.DAY ONE...THROUGH TONIGHT...

THUNDERSTORM OUTLOOK...
THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS THROUGH TONIGHT
ACROSS MUCH OF OKLAHOMA AND WESTERN NORTH TEXAS.

LOCATION...
THE MODERATE RISK AREA INCLUDES ALL AREAS OF OKLAHOMA AND WESTERN
NORTH TEXAS NORTH AND EAST OF A LINE FROM GAGE TO ALTUS IN
OKLAHOMA...TO ARCHER CITY IN WESTERN NORTH TEXAS. A SLIGHT RISK
COVERS THE REMAINDER OF WESTERN NORTH TEXAS.

TIMING...
THE MOST LIKELY TIME FOR SEVERE THUNDERSTORMS WILL BE THROUGH 2 AM
THURSDAY.

RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE
RISK AREA SHOULD PLAN FOR SEVERE WEATHER OPERATIONS THROUGH EARLY
THURSDAY MORNING.

IMPACTS... DAMAGING WIND GUSTS UP TO 80 MPH...CAUSING DAMAGE TO
STRUCTURES...TREES...AND UTILITY LINES.

HAIL UP TO 3 INCHES IN DIAMETER...CAUSING DAMAGE TO
WINDOWS...ROOFS...AND CARS.

DISCUSSION...
SCATTERED THUNDERSTORMS WERE DEVELOPING IN THE VICINITY OF A
DRYLINE EXTENDING SOUTHWARD THROUGH THE EASTERN TEXAS PANHANDLE.
THESE STORMS ARE EXPECTED TO MOVE EASTWARD INTO PARTS OF WESTERN
OKLAHOMA AND NORTH TEXAS THIS EVENING ADDITIONAL STORMS ARE EXPECTED
TO DEVELOP ACROSS PARTS OF WESTERN AND CENTRAL KANSAS IN THE VICNITY
OF A WARM FRONT. THESE STORMS ARE EXPECTED TO BECOME MORE NUMEROUS
DURING THE EVENING AND MOVE SOUTHEASTWARD INTO OKLAHOMA AIDED BY AN
UPPER LEVEL MOVING INTO THE PLAINS STATES. FAVORABLE WIND FIELDS AND
AN EXTREMELY UNSTABLE AIRMASS WILL SUPPORT THE DEVELOPMENT OF SEVERE
STORMS. INITIAL STORMS WILL LIKELY BE DISCRETE SUPERCELLS CAPABLE OF
PRODUCING VERY LARGE HAIL TO BASEBALL SIZE AND PERHAPS A TORNADO OR
TWO...ESPECIALLY IN THE VICINITY OF THE FRONTAL BOUNDARY WHERE LOW
LEVEL WINDS WILL BE MORE FAVORABLE FOR STORM ROTATION. LATER THIS
EVENING...STORMS WILL LIKELY MERGE INTO A SEVERE SQUALL
LINE...POSING A THREAT OF WIDESPREAD DAMAGING WINDS. THE SEVERE
THREAT WILL LAST WELL INTO THE OVERNIGHT HOURS AS THIS CLUSTER OF
STORMS PUSHES SOUTHEASTWARD.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT THURSDAY MAY 31.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...100 PERCENT.

OTHER HAZARDOUS WEATHER...
NONE.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY...

THUNDERSTORM OUTLOOK...
THUNDERSTORMS WILL LINGER INTO THURSDAY AFTERNOON AS A COLD FRONT
SWEEPS ACROSS THE AREA. WHILE A FEW MARGINALLY SEVERE STORMS MAY
OCCUR...WIDESPREAD SEVERE WEATHER IS NOT EXPECTED THURSDAY. THE NEXT
CHANCE FOR THUNDERSTORMS WILL ARRIVE SATURDAY AS ANOTHER STORM
SYSTEM APPROACHES THE REGION.

OTHER HAZARDOUS WEATHER...
NONE.

AUSTIN/II

In the hours before

Special weather statement, May 30, 8:25 PM CDT, 1 hour 19 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
825 PM CDT WED MAY 30 2012

OKZ004>010-310200-
HARPER OK-WOODWARD OK-GRANT OK-WOODS OK-KAY OK-ELLIS OK-ALFALFA OK-
825 PM CDT WED MAY 30 2012

...SIGNIFICANT WEATHER ADVISORY FOR HARPER...NORTHERN WOODWARD...
GRANT...WOODS...KAY...NORTH CENTRAL ELLIS AND ALFALFA COUNTIES
UNTIL 900 PM CDT...

AT 822 PM CDT...THE LEADING EDGE OF STRONG AND GUSTY THUNDERSTORM
WINDS EXTENDED ACROSS SOUTHERN KANSAS...FROM SOUTH OF
WICHITA TO NEAR DODGE CITY...MOVING SOUTH AT 50 MPH. WIND GUSTS
WITHIN THIS AREA WERE COMMONLY STRONGER THAN 50 MPH...AND SOME WERE
STRONGER THAN 60 MPH. THESE WINDS ARE EXPECTED TO ENTER FAR NORTHERN
OKLAHOMA BETWEEN 845 PM AND 900 PM.

HAZARDS INCLUDE...
POTENTIALLY SEVERE WINDS GUSTING OVER 55 MPH...

LOCATIONS IMPACTED INCLUDE...
PONCA CITY...ALVA...BLACKWELL...TONKAWA...NEWKIRK...CHEROKEE...
BUFFALO...MEDFORD...LAVERNE...WAYNOKA...POND CREEK...LAMONT...
WAKITA...KAW CITY...FREEDOM...BRAMAN...JET...NASH...BURLINGTON AND
DACOMA.

LAT...LON 3697 9674 3678 9675 3675 9689 3668 9695
      3670 9704 3660 9705 3657 10001 3700 10000
TIME...MOT...LOC 0122Z 346DEG 42KT 3743 9673 3738 9994

CMS

Local storm report, May 30, 8:29 PM CDT, 1 hour 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
829 PM CDT WED MAY 30 2012

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

0810 PM     HAIL             BOMARTON                33.50N 99.43W
05/30/2012  E1.75 INCH       BAYLOR             TX   PUBLIC

&&

FM

Local storm report, May 30, 8:32 PM CDT, 1 hour 12 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
832 PM CDT WED MAY 30 2012

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

0810 PM     TSTM WND GST     BOMARTON                33.50N 99.43W
05/30/2012  E60 MPH          BAYLOR             TX   PUBLIC

&&

FM

Special weather statement, May 30, 8:37 PM CDT, 1 hour 7 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
837 PM CDT WED MAY 30 2012

OKZ039-041-045-046-050-310200-
JEFFERSON OK-LOVE OK-MURRAY OK-STEPHENS OK-CARTER OK-
837 PM CDT WED MAY 30 2012

...SIGNIFICANT WEATHER ADVISORY FOR JEFFERSON...LOVE...
SOUTHWESTERN MURRAY...SOUTHEASTERN STEPHENS AND CARTER COUNTIES
UNTIL 900 PM CDT...

AT 835 PM CDT...STRONG THUNDERSTORMS WERE ALONG A LINE EXTENDING
FROM 6 MILES SOUTH OF LOCO TO GRADY...MOVING EAST AT 40 MPH.

HAZARDS INCLUDE...
HAIL UP TO THE SIZE OF NICKELS...
WIND GUSTS TO 55 MPH...
FREQUENT CLOUD TO GROUND LIGHTNING...

LOCATIONS IMPACTED INCLUDE...
LONE GROVE...HEALDTON...WILSON...RINGLING...CORNISH...BURNEYVILLE...
RUBOTTOM...GRADY...GRAHAM...MILO...COURTNEY AND PETERSBURG.

LAT...LON 3388 9718 3392 9721 3388 9726 3389 9746
      3392 9750 3390 9759 3395 9759 3399 9766
      3394 9774 3431 9778 3442 9720 3388 9713
TIME...MOT...LOC 0135Z 265DEG 35KT 3424 9771 3398 9767

..SPEG.

Local storm report, May 30, 8:41 PM CDT, 1 hour 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
841 PM CDT WED MAY 30 2012

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

0800 PM     TSTM WND GST     4 ENE WAURIKA           34.19N 97.93W
05/30/2012  E60 MPH          JEFFERSON          OK   PUBLIC

&&

FM

Local storm report, May 30, 9:44 PM CDT, 0 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
944 PM CDT WED MAY 30 2012

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

0810 PM     HAIL             BOMARTON                33.50N 99.43W
05/30/2012  E1.75 INCH       BAYLOR             TX   PUBLIC

0845 PM     HAIL             12 SSE SEYMOUR          33.44N 99.18W
05/30/2012  E2.75 INCH       BAYLOR             TX   LAW ENFORCEMENT

0858 PM     TSTM WND GST     6 NNW COURTNEY          34.01N 97.54W
05/30/2012  E60 MPH          LOVE               OK   PUBLIC

0859 PM     HAIL             KNOX CITY               33.42N 99.82W
05/30/2012  E1.00 INCH       KNOX               TX   911 CALL CENTER

0930 PM     TSTM WND GST     1 SW BUFFALO            36.82N 99.64W
05/30/2012  M65 MPH          HARPER             OK   MESONET

&&

FM

The office that day

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

Issued	Product	Office	Counties	Lasted
May 30, 7:04 PM CDT	Special Weather Statement	OUN	Cotton	26 min
May 30, 7:09 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Canadian, Kingfisher	15 min
May 30, 7:11 PM CDT	Severe Thunderstorm Warning	OUN	Cotton	49 min
May 30, 7:31 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Grady	29 min
May 30, 7:33 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Jefferson, Stephens	57 min
May 30, 8:25 PM CDT	Special Weather Statement	OUN	Alfalfa, Grant, Harper, Kay, Woods	35 min
May 30, 8:37 PM CDT	Special Weather Statement	OUN	Carter, Love	23 min
May 30, 8:53 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Ellis, Garfield, Grant, Harper, Kay and 3 more	52 min
May 30, 8:53 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Jefferson, Love, Stephens	52 min
May 30, 10:06 PM CDT	Special Weather Statement	OUN	Marshall	24 min
May 30, 10:32 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Custer, Dewey, Garfield, Grant, Kay and 6 more	58 min
May 30, 10:44 PM CDT	Special Weather Statement	OUN	Carter, Cotton, Jefferson, Johnston, Love, Murray and 1 more	61 min
May 30, 11:02 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Canadian, Cleveland, Custer, Grady and 8 more	43 min
May 30, 11:32 PM CDT	Special Weather Statement	OUN	Comanche, Garvin, Grady, Kiowa, McClain, Stephens	43 min
May 30, 11:48 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Garvin, Grady, Lincoln, Logan and 5 more	42 min
May 31, 12:10 AM CDT	Special Weather Statement	OUN	Garvin, McClain, Pottawatomie, Seminole, Stephens	35 min
May 31, 12:44 AM CDT	Special Weather Statement	OUN	Carter, Hughes, Jefferson, Johnston, Murray, Pontotoc and 1 more	46 min

Nearby

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.