Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 346, NWS Norman, OK

June 15, 2011Harper County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jun 15, 2011, 10:33 PM CDT for Harper County, Oklahoma. It was in force for 57 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jun 15, 2011, 10:33 PM CDT (03:33 UTC)
Expired: Jun 15, 2011, 11:30 PM CDT
In force: 57 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

County Harper County, OK

The radar

The Dodge City radar (KDDC), 100 km from the middle of the area, began a volume at 03:33 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

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

Dodge City, (KDDC), launched 00:00Z, 3.6 hours before the alert went out and 99 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3490 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 56 m²/s²
0-3 km storm-relative helicity: 179 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.

468 
WUUS54 KOUN 160333
SVROUN
OKC059-160430-
/O.NEW.KOUN.SV.W.0346.110616T0333Z-110616T0430Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
1033 PM CDT WED JUN 15 2011

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN HARPER COUNTY IN NORTHWEST OKLAHOMA...

* UNTIL 1130 PM CDT

* AT 1032 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
  THUNDERSTORM 17 MILES NORTH OF ROSSTON...MOVING SOUTHEAST AT 25   
MPH. THE LEADING EDGE OF THIS STORM WILL LIKELY PRODUCE WINDS NEAR
60 MPH.  

HAZARDS IN THE WARNING INCLUDE...
HAIL UP TO THE SIZE OF QUARTERS...
WIND GUSTS TO 60 MPH...

* LOCATIONS IN THE WARNING INCLUDE BUFFALO...LAVERNE...ROSSTON AND
  SELMAN.

LAT...LON 3701 9951 3699 9945 3685 9934 3661 10000
      3668 10002 3694 10001 3700 9999
TIME...MOT...LOC 0332Z 307DEG 22KT 3703 9995

$$

3 follow-up statements

085 
WWUS54 KOUN 160341
SVSOUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1041 PM CDT WED JUN 15 2011

OKC059-160430-
/O.CON.KOUN.SV.W.0346.000000T0000Z-110616T0430Z/
HARPER OK-
1041 PM CDT WED JUN 15 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1130 PM CDT
FOR NORTHWESTERN HARPER COUNTY...

AT 1040 PM CDT...NATIONAL WEATHER SERVICE RADAR DETECTED A SEVERE
THUNDERSTORM 14 MILES NORTH OF ROSSTON...MOVING SOUTHEAST AT 25 MPH.


HAZARDS IN THE WARNING INCLUDE...
HAIL UP TO THE SIZE OF HALF DOLLARS AND GOLFBALLS...
WIND GUSTS TO 70 MPH...

* LOCATIONS IN THE WARNING INCLUDE BUFFALO...LAVERNE...ROSSTON AND
  SELMAN.

LAT...LON 3701 9951 3699 9945 3685 9934 3661 10000
      3668 10002 3694 10001 3700 9999
TIME...MOT...LOC 0340Z 307DEG 22KT 3700 9990

$$

822 
WWUS54 KOUN 160359
SVSOUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1059 PM CDT WED JUN 15 2011

OKC059-160430-
/O.CON.KOUN.SV.W.0346.000000T0000Z-110616T0430Z/
HARPER OK-
1059 PM CDT WED JUN 15 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1130 PM CDT
FOR NORTHWESTERN HARPER COUNTY...

AT 1058 PM CDT...NATIONAL WEATHER SERVICE RADAR DETECTED A SEVERE
THUNDERSTORM 8 MILES NORTHEAST OF ROSSTON...MOVING SOUTHEAST AT 25 
MPH.  THIS STORM SHOULD REACH BUFFALO BY 1115 PM

HAZARDS IN THE WARNING INCLUDE...
HAIL UP TO THE SIZE OF GOLF BALLS...
WIND GUSTS TO 60 TO 70 MPH...

* LOCATIONS IN THE WARNING INCLUDE BUFFALO...LAVERNE...ROSSTON AND
  SELMAN.

LAT...LON 3701 9951 3699 9945 3685 9934 3661 10000
      3668 10002 3694 10001 3700 9999
TIME...MOT...LOC 0358Z 307DEG 22KT 3689 9981

$$

295 
WWUS54 KOUN 160414
SVSOUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1114 PM CDT WED JUN 15 2011

OKC059-160430-
/O.CON.KOUN.SV.W.0346.000000T0000Z-110616T0430Z/
HARPER OK-
1114 PM CDT WED JUN 15 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1130 PM CDT
FOR NORTHWESTERN HARPER COUNTY...

AT 1115 PM CDT...NATIONAL WEATHER SERVICE RADAR DETECTED A SEVERE
THUNDERSTORM 6 MILES WEST OF BUFFALO...MOVING SOUTHEAST AT 25 MPH.

HAZARDS IN THE WARNING INCLUDE...
HAIL UP TO THE SIZE OF GOLF BALLS...
DESTRUCTIVE WIND GUSTS TO 75 MPH...

* LOCATIONS IN THE WARNING INCLUDE BUFFALO...LAVERNE...ROSSTON AND
  SELMAN.

LAT...LON 3701 9951 3699 9945 3685 9934 3661 10000
      3668 10002 3694 10001 3700 9999
TIME...MOT...LOC 0415Z 307DEG 22KT 3683 9971

$$

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 Jun 15, 9:30 PM CDT, 1 hour 3 minutes earlier.

Area forecast discussion, Jun 15, 9:30 PM CDT, 1 hour 3 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
930 PM CDT WED JUN 15 2011

SCATTERED SHOWERS/TSTMS CONTINUE TO MOVE SEWD ACROSS KS THIS
EVENING. AS LLJ INCREASES STORMS MAY HOLD TOGETHER AND MOVE INTO NW
OK. THUS WILL ADD SOME POPS FOR THAT AREA. WITH LOSS OF HEATING AND
CONTINUED WEAKENING OF BOUNDARY IN SOUTHERN OK WILL REMOVE POPS FOR
THE REMAINDER OF THE NIGHT IN THAT AREA.

&&

.PREV DISCUSSION... /ISSUED 619 PM CDT WED JUN 15 2011/

.AVIATION...
BEST CHANCE FOR STORMS OVER THE NEXT 1 TO 2 HOURS WILL BE NEAR
LAW/SPS SITES. IF STORMS CAN FORM...THEY WILL HAVE THE POTENTIAL
TO BRING DAMAGING WINDS AND SOME HAIL THROUGH THE MID EVENING
HOURS. OTHER STORMS HAVE FORMED ACROSS PARTS OF WEST CENTRAL
KANSAS THIS AFTERNOON. AS LLJ INCREASES...STORMS MAY BUILD INTO
NORTHWEST OKLAHOMA BY 4-5Z. AT THIS TIME WILL ONLY MENTION CB AT
WWR/GAG SITES. ELSEWHERE...VFR CONDITIONS SHOULD PREVAIL THROUGH
THE PERIOD.

&&

.PREV DISCUSSION... /ISSUED 337 PM CDT WED JUN 15 2011/

DISCUSSION...
COLD FRONT CONTINUES TO SLOWLY SAG SOUTH. CUMULUS HAS BEEN
DEVELOPING IN THE VICINITY OF WICHITA FALLS AND NEAR DURANT NEAR
AND SOUTH OF THIS FRONT AND LAPS SHOWS CONVECTIVE INHIBITION
DECREASING TO LESS THAN 30 J/KG IN THE SOUTHEAST AND SOUTHWEST
CORNERS OF THE CWA. THERE IS SOME SIGNAL FROM OUN WRF OF STORM
DEVELOPMENT NEAR THE RED RIVER AGAIN LATE THIS AFTERNOON OR THIS
EVENING... BUT OVERALL THERE IS LESS SIGNAL THAN YESTERDAY FOR
STORMS AND SO NOT EXPECT STORMS /SHOULD THEY FORM/ TO BE AS
WIDESPREAD. BUT IS STILL WORK KEEPING SLIGHT CHANCE POPS IN THE
SOUTH THIS EVENING.

CURRENT MODEL INDICATION ARE THAT THEY DRYLINE MAY STAY NEAR OR
WEST OF THE 100TH MERIDIAN TOMORROW WHICH WOULD KEEP DEWPOINTS AND
HUMIDITY SOMEWHAT HIGHER IN WESTERN OKLAHOMA AND WESTERN NORTH
TEXAS. EVEN RAISING THE DEWPOINTS... THE MIN RH VALUES ARE STILL
AROUND 20 PERCENT IN THE WESTERN TIER OR TWO OF COUNTIES. WILL
KEEP THE FIRE WEATHER WATCH FOR TOMORROW AND LET THE MIDNIGHT
SHIFT DECIDE BASED ON THE LATEST EXPECTATIONS OF HOW MUCH DRY AIR
MAY MOVE INTO WESTERN SECTIONS OF THE AREA.

OTHERWISE... NO SIGNIFICANT CHANGES ARE NEEDED IN THE PACKAGE THIS
AFTERNOON. EXPECT THE CHANCE OF DRYLINE STORMS MOST AFTERNOONS AS
UPPER TROF OVER THE WESTERN UNITED STATES SLOWLY MOVES TOWARD THE
PLAINS.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  73  97  76  97 /  10  10  10  10
HOBART OK         75 102  76 105 /  10  10  10  10
WICHITA FALLS TX  77 105  77 105 /  20  10  10  10
GAGE OK           70 102  70 105 /  10  20  20   0
PONCA CITY OK     72  98  77  97 /  10  20  20  10
DURANT OK         75  96  76  94 /  20  10  10   0

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...FIRE WEATHER WATCH FROM THURSDAY AFTERNOON THROUGH THURSDAY
     EVENING FOR OKZ004-005-009-010-014>016-021-022-033>038.

TX...FIRE WEATHER WATCH FROM THURSDAY AFTERNOON THROUGH THURSDAY
     EVENING FOR TXZ083>089.

&&

Hazardous weather outlook, Jun 15, 11:55 AM CDT, 10 hours 38 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1155 AM CDT WED JUN 15 2011

OKZ004>048-050>052-TXZ083>090-161000-
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 WED JUN 15 2011

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

.DAY ONE...TODAY AND TONIGHT...

THUNDERSTORM OUTLOOK...
ISOLATED SEVERE STORMS ARE POSSIBLE LATE THIS AFTERNOON AND THIS
EVENING NEAR THE RED RIVER.

DISCUSSION...
A COLD FRONT WILL STALL NEAR THE RED RIVER THIS AFTERNOON. ALTHOUGH
THERE WILL BE MUCH LESS FORCING TO INITIATE THUNDERSTORMS COMPARED
TO YESTERDAY...AND INSTABILITY AND SHEAR WILL BE SOMEWHAT
LESS...DAYTIME HEATING AND THE EXISTENCE OF THE FRONT MAY YIELD A
FEW STRONG OR EVEN ISOLATED SEVERE THUNDERSTORMS. THE PRIMARY
CONCERN WILL BE DAMAGING WIND GUSTS...BUT LARGE HAIL WILL ALSO BE A
THREAT.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT THURSDAY JUN 16.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...40 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...70 PERCENT.

OTHER HAZARDOUS WEATHER...
NONE.

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

THUNDERSTORM OUTLOOK...
WITH VERY HOT TEMPERATURES AND A DIFFUSE DRYLINE NEAR WESTERN AND
NORTHERN OKLAHOMA FROM THURSDAY THROUGH THE WEEKEND...AN ISOLATED
THUNDERSTORM OR TWO MAY OCCUR DURING THE LATE AFTERNOON HOURS NEAR
THE DRYLINE. IF ANY STORM CAN DEVELOP...DAMAGING WIND GUSTS WILL BE
POSSIBLE. MORE ORGANIZED THUNDERSTORM ACTIVITY IS EXPECTED NEXT
MONDAY AND TUESDAY...AS ANOTHER COLD FRONT MOVES INTO THE REGION.
SOME OF THESE STORMS...IF THEY OCCUR...WILL LIKELY BE SEVERE.

OTHER HAZARDOUS WEATHER...
FIRES WILL REMAIN A CONCERN IN THOSE AREAS HARDEST HIT BY LONG TERM
DROUGHT...PRIMARILY IN WESTERN OKLAHOMA AND WESTERN NORTH TEXAS.
WINDS WILL BE ESPECIALLY GUSTY THURSDAY THROUGH THE WEEKEND.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT 5 AM
THURSDAY.

CMS

In the hours before

Special weather statement, Jun 15, 10:24 PM CDT, 9 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1024 PM CDT WED JUN 15 2011

OKZ004-160400-
HARPER OK-
1024 PM CDT WED JUN 15 2011

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR HARPER COUNTY.

AT 1024 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 25 MILES NORTH OF
ROSSTON...MOVING SOUTHEAST AT 25 MPH.

MONITOR THE SITUATION CLOSELY. BE READY TO ACT QUICKLY IF A WARNING
IS ISSUED OR STORMS THREATEN YOU.

LAT...LON 3701 9947 3697 9942 3696 9942 3673 10001
      3694 10001 3699 10001 3700 9999

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 15, 10:24 PM CDT	Special Weather Statement	OUN	Harper	36 min
Jun 15, 11:18 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Harper, Woods, Woodward	57 min
Jun 16, 12:06 AM CDT	Severe Thunderstorm Warning	OUN	Ellis, Woodward	54 min
Jun 16, 12:31 AM CDT	Special Weather Statement	OUN	Woods	29 min
Jun 16, 12:43 AM CDT	Severe Thunderstorm Warning	OUN	Woods	62 min
Jun 16, 1:33 AM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Grant	57 min
Jun 16, 1:42 AM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Major, Woods	63 min
Jun 16, 1:54 AM CDT	Special Weather Statement	OUN	Woodward	36 min
Jun 16, 2:22 AM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant	38 min
Jun 16, 2:27 AM CDT	Severe Thunderstorm Warning	OUN	Major	33 min
Jun 16, 2:55 AM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant, Kay, Noble	65 min
Jun 16, 3:01 AM CDT	Special Weather Statement	OUN	Major	14 min
Jun 16, 3:33 AM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kingfisher, Logan, Noble, Payne	42 min
Jun 16, 3:44 AM CDT	Red Flag Warning	OUN	Beckham, Ellis, Greer, Harmon, Harper, Jackson and 2 more	16 hr
Jun 16, 3:48 AM CDT	Severe Thunderstorm Warning	OUN	Noble, Payne	57 min
Jun 16, 3:59 AM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Payne	76 min
Jun 16, 4:28 AM CDT	Special Weather Statement	OUN	Lincoln, Oklahoma	47 min
Jun 16, 5:01 AM CDT	Special Weather Statement	OUN	Pottawatomie	44 min
Jun 16, 5:16 AM CDT	Special Weather Statement	OUN	Kingfisher, Logan	44 min
Jun 16, 6:04 AM CDT	Special Weather Statement	OUN	Lincoln	26 min
Jun 16, 6:52 AM CDT	Special Weather Statement	OUN	Logan	38 min
Jun 16, 7:21 AM CDT	Special Weather Statement	OUN	Grady	39 min
Jun 16, 8:12 AM CDT	Special Weather Statement	OUN	Caddo	18 min
Jun 16, 10:05 AM CDT	Special Weather Statement	OUN	Kay	25 min
Jun 16, 10:14 AM CDT	Severe Thunderstorm Warning	OUN	Kay, Noble	46 min
Jun 16, 2:24 PM CDT	Special Weather Statement	OUN	Kay	21 min
Jun 16, 2:50 PM CDT	Special Weather Statement	OUN	Kay	25 min
Jun 16, 3:54 PM CDT	Wind Advisory	OUN	Alfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 24 more	13 hr
Jun 16, 5:27 PM CDT	Special Weather Statement	OUN	Beckham	18 min
Jun 16, 5:46 PM CDT	Special Weather Statement	OUN	Harmon	29 min
Jun 16, 6:09 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson	66 min
Jun 16, 6:21 PM CDT	Special Weather Statement	OUN	Beckham	24 min
Jun 16, 6:41 PM CDT	Special Weather Statement	OUN	Beckham	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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.