Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 459, NWS Norman, OK

May 25, 2008Ellis County, Roger Mills County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 25, 2008, 10:02 PM CDT for Ellis County, Roger Mills County, Oklahoma. It was in force for 43 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 25, 2008, 10:02 PM CDT (03:02 UTC)
Expired: May 25, 2008, 10:45 PM CDT
In force: 43 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Ellis County, OK, Roger Mills County, OK

The radar

The Vance AFB radar (KVNX), 168 km from the middle of the area, began a volume at 03:05 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.

Issued	Product	Office	Lasted
May 25, 5:51 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 00:00Z, 3.0 hours before the alert went out and 196 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: 1250 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 2362 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 103 m²/s²
0-3 km storm-relative helicity: 201 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.4

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 25, 8:21 PM CDT, 1 hour 41 minutes earlier.

Area forecast discussion, May 25, 8:21 PM CDT, 1 hour 41 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
821 PM CDT SUN MAY 25 2008

.DISCUSSION...QUICK UPDATE TO BUMP UP POPS FOR NWRN THIRD OF THE
FA AS TSTMS WHICH DEVELOPED OVER THE TX PANHANDLE EDGE INTO FAR NW
OK. BEST INSTABILITY STILL ARCS INTO NWRN OK WHERE DEEP LAYER
SHEAR IS ALSO A BIT STRONGER THAN AREAS FARTHER S AND E. SO SEVERE
THREAT SHOULD LINGER INTO THE EVENING ACROSS NW OK.

&&

.PREV DISCUSSION... /ISSUED 245 PM CDT SUN MAY 25 2008/

DISCUSSION...
CONVECTION HAS BEEN SUPPRESSED OVER THE CWA TODAY IN WAKE OF MCV
NOW LIFTING NE ACROSS NE OK. MODERATE INSTABILITY IN PLACE...
ALTHOUGH NOT AS UNSTABLE AS YESTERDAY WITH SBCAPE CURRENTLY
RUNNING 2000-3000 J/KG. SUBSIDENCE BEHIND MCV AND LACK OF A
SIGNIFICANT LOW-LEVEL FOCUS EXPECTED TO KEEP THE AREA QUIET INTO
AT LEAST EARLY EVENING... BUT ACTIVITY DEVELOPING ALONG SFC FRONT
ACROSS W KS AND SOUTHWARD ALONG DRYLINE INTO W TX PANHANDLE WILL
BE MONITORED FOR POSSIBLE MOVEMENT INTO AT LEAST NW OK BY MID-LATE
EVENING. SOME POTENTIAL FOR CONTINUED FORWARD PROPAGATION INTO SW-
CENTRAL-NE ZONES LATE TONIGHT IF STORMS ORGANIZE UPSCALE. SIMILAR
EVOLUTION INDICATED ON MONDAY EXCEPT INITIAL DEVELOPMENT MAY BE A
BIT CLOSER TO W OK PER 12Z NAM12. THERE ALSO IS SOME LOW-END
POTENTIAL FOR MORE ORGANIZED CONVECTION IN KS MONDAY EVENING
SENDING AN OUTFLOW BOUNDARY S INTO N OK WITH ATTENDANT LOW CHANCES
INTO FAR NCENTRAL OK OVERNIGHT. THIS ENTIRE SCENARIO IS NOT
REFLECTED WELL IN GUIDANCE POPS... FORCING MANUAL MODIFICATION
OF POP/WX GRIDS TONIGHT THROUGH MON NIGHT. ON TUE... STRONG COLD
FRONT FOR LATE MAY IS EXPECTED INTO NW OK IN THE MORNING AND INTO
THE I-44 CORRIDOR BY MID EVENING. FRONT WILLL ENHANCE CONVECTIVE
POTENTIAL AHEAD OF IT AND WILL BE FOLLOWED BY NOTICEABLY
COOLER/DRIER AIR TUE NIGHT AND WED. HAVE USED NAM12 WINDS TO GET
BETTER RESOLUTION OF THE FRONTAL PASSAGE THAN MIGHT OTHERWISE BE
OBTAINED FROM GFS MOS.

FOR WED AND BEYOND - HAVE DEFAULTED BACK TO GFS AND ASSOCIATED
MOS. DRY WITH A WARMING TREND AFTER MIDWEEK FOLLOWED BY ANOTHER
POSSIBLE COLD FRONT AND INCREASING POPS NEXT WEEKEND. 24

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  72  91  72  88 /  20  10  20  20
HOBART OK         72  94  72  91 /  30  10  20  20
WICHITA FALLS TX  73  95  73  92 /  10   0  10  20
GAGE OK           67  90  64  81 /  60  20  20  20
PONCA CITY OK     70  92  70  85 /  40  10  30  20
DURANT OK         73  91  73  87 /  10  10  10  20

&&

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

02/99

Hazardous weather outlook, May 25, 2:45 PM CDT, 7 hours 17 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
245 PM CDT SUN MAY 25 2008

OKZ004>048-050>052-TXZ083>090-261200-
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-
245 PM CDT SUN MAY 25 2008

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

.DAY ONE...THROUGH TONIGHT...

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

LOCATION...
THE SLIGHT RISK IS WEST OF A LINE FROM MEDFORD... TO WEATHERFORD...
AND ALTUS OKLAHOMA TO CROWELL TEXAS.

TIMING...
THE MOST LIKELY TIME FOR SEVERE THUNDERSTORMS WILL BE FROM 6 PM
THROUGH 2 AM.

IMPACTS...
HAIL TO THE SIZE OF GOLFBALLS AND WIND GUSTS TO 70 MPH WILL BE THE
MAIN THREATS. HOWEVER AN ISOLATED TORNADO WILL ALSO BE POSSIBLE...
MAINLY ACROSS NORTHWEST OKLAHOMA.

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

DISCUSSION...
THUNDERSTORMS WILL CONTINUE TO DEVELOP ALONG AND NEAR A DRYLINE
ACROSS WEST TEXAS THIS AFTERNOON. THIS ACTIVITY WILL GRADUALLY MOVE
EAST AROSS THE OKLAHOMA AND TEXAS PANHANDLES TOWARD WESTERN
OKLAHOMA. SOME OF THESE STORMS MAY MOVE INTO PORTIONS OF WESTERN AND
NORTHWESTERN OKLAHOMA DURING THE LATE AFTERNOON AND EVENING HOURS.
MODERATE AMOUNTS OF INSTABILITY ALONG WITH FAVORABLE VERTICAL WIND
PROFILES WILL MEAN A FEW OF THESE STORMS COULD BE SEVERE...
PRODUCING LARGE HAIL... DAMAGING STRAIGHT-LINE WINDS AND ISOLATED
TORNADOES.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT MONDAY MAY 26.
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...MONDAY THROUGH SATURDAY...

THUNDERSTORM OUTLOOK...
ON MONDAY THE DRYLINE WILL LIKELY GENERATE A FEW THUNDERSTORMS THAT
WILL MOVE INTO WESTERN OKLAHOMA LATE IN THE AFTERNOON AND EVENING.

TUESDAY AND WEDNESDAY THUNDERSTORMS ARE FORECAST TO DEVELOP ALONG A
COLD FRONT MOVING SLOWLY FROM NORTH TO SOUTH. UPPER LEVEL WIND WILL
DECREASE... RESULTING IN SLOW MOVING STORMS WITH HEAVY RAIN.

OTHER HAZARDOUS WEATHER...
NONE.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT 7 AM
MONDAY.

30

In the hours before

Special weather statement, May 25, 7:26 PM CDT, 2 hours 36 minutes before

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Special weather statement, May 25, 7:50 PM CDT, 2 hours 12 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
750 PM CDT SUN MAY 25 2008

OKZ009-010-260115-
WOODWARD OK-ELLIS OK-
750 PM CDT SUN MAY 25 2008

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR ELLIS AND WOODWARD COUNTIES.

A STRONG THUNDERSTORM WAS LOCATED 11 MILES WEST OF FARGO AT 750 PM
CDT...MOVING EAST AT 37 MPH.

SMALL HAIL AND WINDS AROUND 50 MPH ARE POSSIBLE.

PEOPLE IN ELLIS AND WOODWARD COUNTIES...INCLUDING THE CITY OF
WOODWARD...SHOULD MONITOR THE WEATHER SITUATION CLOSELY. LISTEN FOR
WARNINGS AND REMAIN ALERT FOR THREATENING WEATHER CONDITIONS.

30

Special weather statement, May 25, 8:28 PM CDT, 1 hour 34 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
828 PM CDT SUN MAY 25 2008

OKZ004-009-010-260200-
WOODWARD OK-HARPER OK-ELLIS OK-
828 PM CDT SUN MAY 25 2008

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR ELLIS...HARPER AND WOODWARD
COUNTIES.

A STRONG THUNDERSTORM WAS LOCATED 6 MILES NORTHWEST OF FARGO AT 828
PM CDT...MOVING NORTHEAST AT 34 MPH.

SMALL HAIL AND WINDS AROUND 50 MPH ARE POSSIBLE.

PEOPLE IN ELLIS...HARPER AND WOODWARD COUNTIES...INCLUDING THE CITY
OF WOODWARD...SHOULD MONITOR THE WEATHER SITUATION CLOSELY. LISTEN
FOR WARNINGS AND REMAIN ALERT FOR THREATENING WEATHER CONDITIONS.

30

Special weather statement, May 25, 8:44 PM CDT, 1 hour 18 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
844 PM CDT SUN MAY 25 2008

OKZ005-260215-
WOODS OK-
844 PM CDT SUN MAY 25 2008

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR WOODS COUNTY.

A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM 19 MILES NORTHWEST OF
ALVA TO 11 MILES NORTHWEST OF AVARD AT 844 PM CDT...MOVING EAST AT 38
MPH.

40 TO 50 MPH WINDS ARE LIKELY WITH THESE STORMS. SMALL HAIL IS ALSO
POSSIBLE.

Special weather statement, May 25, 8:55 PM CDT, 1 hour 7 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
855 PM CDT SUN MAY 25 2008

OKZ010-260230-
WOODWARD OK-
855 PM CDT SUN MAY 25 2008

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR WOODWARD COUNTY.

A STRONG THUNDERSTORM WAS LOCATED OVER WOODWARD AT 855 PM CDT...
MOVING EAST AT 24 MPH.

SMALL HAIL...BRIEF HEAVY RAIN...AND WINDS AROUND 50 MPH ARE LIKELY.

Special weather statement, May 25, 9:20 PM CDT, 42 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
920 PM CDT SUN MAY 25 2008

OKZ005-006-260245-
WOODS OK-ALFALFA OK-
920 PM CDT SUN MAY 25 2008

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR ALFALFA AND WOODS COUNTIES.

A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM 7 MILES NORTHEAST OF
CAPRON TO 4 MILES SOUTHWEST OF HOPETON AT 920 PM CDT...MOVING EAST AT
30 MPH.

40 TO 50 MPH WINDS AND BRIEF HEAVY RAIN ARE LIKELY AS THE STORMS
MOVE ACROSS THE ALVA AND CHEROKEE AREAS. SMALL HAIL IS ALSO
POSSIBLE.

The office that day

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

Issued	Product	Office	Counties	Lasted
May 25, 9:39 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Woods	51 min
May 25, 10:42 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Dewey, Ellis, Roger Mills, Woodward	48 min
May 25, 10:48 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Grant	27 min
May 25, 11:18 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Grant, Major	57 min
May 25, 11:28 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Custer, Dewey, Major	47 min
May 26, 12:12 AM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kingfisher	48 min
May 26, 12:53 AM CDT	Severe Thunderstorm Warning	OUN	Kay, Noble, Payne	46 min
May 26, 3:30 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Woodward	45 min
May 26, 4:12 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Woodward	48 min
May 26, 4:23 PM CDT	Severe Thunderstorm Warning	OUN	Grant	52 min
May 26, 4:47 PM CDT	Severe Thunderstorm Warning	OUN	Woodward	20 min
May 26, 4:52 PM CDT	Severe Thunderstorm Warning	OUN	Harper, Woods, Woodward	38 min
May 26, 4:59 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Roger Mills	61 min
May 26, 5:07 PM CDT	Severe Thunderstorm Warning	OUN	Grant, Kay	38 min
May 26, 5:29 PM CDT	Severe Thunderstorm Warning	OUN	Harper, Woods	46 min
May 26, 5:45 PM CDT	Severe Thunderstorm Warning	OUN	Grant, Kay	45 min
May 26, 5:57 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Roger Mills	63 min
May 26, 5:59 PM CDT	Tornado Warning	OUN	Kay	31 min
May 26, 6:10 PM CDT	Severe Thunderstorm Warning	OUN	Harper, Woods	20 min
May 26, 6:29 PM CDT	Severe Thunderstorm Warning	OUN	Grant, Kay	46 min
May 26, 6:33 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Harmon	42 min
May 26, 6:39 PM CDT	Tornado Warning	OUN	Kay	36 min
May 26, 6:48 PM CDT	Tornado Warning	OUN	Greer, Harmon	27 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2008 Every severe thunderstorm warning in 2008

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.