Alert archive / Oklahoma / Special Weather Statements in 2011

Special Weather Statement, NWS Norman, OK

May 31, 2011Harmon County, Oklahoma

NWS Norman, OK issued this special weather statement at May 31, 2011, 12:39 AM CDT for Harmon County, Oklahoma. It was in force for 21 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: May 31, 2011, 12:39 AM CDT (05:39 UTC)
Expired: May 31, 2011, 1:00 AM CDT
In force: 21 min
Issued by: NWS Norman, OK

County Harmon County, OK

The radar

The Altus AFB radar (KFDR), 96 km from the middle of the area, began a volume at 05:42 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 nearest sounding before it

Amarillo Airport, TX (KAMA), launched 00:00Z, 5.7 hours before the alert went out and 179 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: 5082 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 87 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.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at May 30, 11:48 PM CDT, 51 minutes earlier.

Area forecast discussion, May 30, 11:48 PM CDT, 51 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
1148 PM CDT MON MAY 30 2011

.AVIATION...
CONVECTION ALONG/NEAR COLD FRONT IN KANSAS WILL GRADUALLY
BUILD INTO NORTHWEST KANSAS DURING THE EARLY PART OF
THE TAF CYCLE. LLJ WILL VEER AND WEAKEN WITH TIME DURING THE
OVERNIGHT HOURS SO EXPECTED CONVECTIVE TRENDS WILL BE ON THE
DECREASE...ESPECIALLY AFTER 9Z. FOR NOW WILL ONLY MENTION TSRA AT
GAG/WWR/PNC. WIND SHIFT WITH FRONTAL BOUNDARY SHOULD ONLY MAKE IT
THROUGH PNC/CSM/WWR/GAG.

&&

.PREV DISCUSSION... /ISSUED 803 PM CDT MON MAY 30 2011/

DISCUSSION...
WE EXTENDED THE WIND ADVISORY FOR MUCH OF NORTHERN AND WESTERN
OKLAHOMA WHERE MIXING AHEAD OF INCOMING FRONT WILL LIKELY RESULT
IN CONTINUED GUSTS AOA 40 MPH. STORMS FAILED TO INITIATE ALONG
DRYLINE...BUT EXPECT DRYLINE/FRONT TO HELP FOCUS STORM DEVELOPMENT
TO OUR NORTH LATE THIS EVENING. MOST MODELS SUPPORT IDEA OF AT
LEAST SCATTERED SHOWERS AND STORMS ALONG FRONT AS IT PROGRESSES
INTO NORTHERN OKLAHOMA TOWARD/AFTER MIDNIGHT AND THEN STALLS
ACROSS SOUTHWEST-CENTRAL OKLAHOMA TOMORROW. AT ANY RATE...RELAXED
GRADIENT NEAR FRONT WILL YIELD WEAKER WINDS TOMORROW.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  72  89  70  92 /  30  30  20  10
HOBART OK         71  90  68  93 /  30  30  20  10
WICHITA FALLS TX  73  92  71  95 /  20  20  10   0
GAGE OK           59  89  65  92 /  40  20  30  10
PONCA CITY OK     69  87  70  92 /  30  30  20  10
DURANT OK         72  90  70  91 /  10  10  10  10

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...WIND ADVISORY UNTIL MIDNIGHT CDT TONIGHT FOR OKZ004>007-009>012-
     014>017-021-022-034-035.

TX...NONE.
&&

Hazardous weather outlook, May 30, 10:20 PM CDT, 2 hours 19 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATE
NATIONAL WEATHER SERVICE NORMAN OK
1020 PM CDT MON MAY 30 2011

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-
1020 PM CDT MON MAY 30 2011

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

.DAY ONE...TONIGHT...

THUNDERSTORM OUTLOOK...
ISOLATED SEVERE STORMS WILL BE POSSIBLE ACROSS FAR NORTHERN
OKLAHOMA.

DISCUSSION...
THUNDERSTORMS WILL REMAIN POSSIBLE OVERNIGHT...PRIMARILY ACROSS
NORTHWEST AND NORTH-CENTRAL OKLAHOMA. A COLD FRONT WILL MOVE INTO
NORTHWEST OKLAHOMA AFTER MIDNIGHT AND MOVE SLOWLY SOUTHEAST INTO
WESTERN AND CENTRAL OKLAHOMA AFTER DAYBREAK TUESDAY. SCATTERED
THUNDERSTORMS WILL BE POSSIBLE NEAR THIS FRONT. A FEW STORMS ACROSS
FAR NORTHERN OKLAHOMA MAY BRIEFLY REACH SEVERE LEVELS AND PRODUCE
LARGE HAIL. THIS THREAT IS PRIMARILY NEAR AND NORTH OF
WOODWARD...ENID...AND PONCA CITY.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT TUESDAY MAY 31.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...60 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...30 PERCENT.

OTHER HAZARDOUS WEATHER...
STRONG SOUTHERLY WINDS WILL CONTINUE ACROSS WESTERN AND NORTHERN
OKLAHOMA THROUGH MIDNIGHT.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...

THUNDERSTORM OUTLOOK...
THUNDERSTORM CHANCES WILL CONTINUE TUESDAY AS THE COLD FRONT STALLS
ACROSS SOUTHWEST AND CENTRAL OKLAHOMA AND THEN LIFTS BACK NORTH. AN
ISOLATED SEVERE STORM OR TWO WILL ALSO BE POSSIBLE TUESDAY. STORM
CHANCES WILL END TUESDAY NIGHT AS AN UPPER RIDGE BEGINS TO BUILD
INTO THE REGION.

OTHER HAZARDOUS WEATHER...
NONE.

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

In the hours before

Special weather statement, May 31, 12:12 AM CDT, 27 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1212 AM CDT TUE MAY 31 2011

OKZ021-033-034-310530-
BECKHAM OK-GREER OK-HARMON OK-
1212 AM CDT TUE MAY 31 2011

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR BECKHAM...GREER AND HARMON
COUNTIES.

AT 1212 AM CDT...A STRONG THUNDERSTORM WAS LOCATED 5 MILES NORTH OF
MADGE...MOVING NORTHEAST AT 55 MPH.

HAZARDS INCLUDE...
HAIL UP TO THE SIZE OF NICKELS...
WIND GUSTS TO 50 MPH...

LAT...LON 3507 10000 3538 9958 3521 9941 3483 10000
      3504 10001

Special weather statement, May 31, 12:24 AM CDT, 15 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1224 AM CDT TUE MAY 31 2011

OKZ004-310600-
HARPER OK-
1224 AM CDT TUE MAY 31 2011

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR HARPER COUNTY.

AT 1224 AM CDT...A STRONG THUNDERSTORM WAS LOCATED 10 MILES NORTH OF
ROSSTON...MOVING NORTHEAST AT 50 MPH.

HAZARDS INCLUDE...
HAIL UP TO THE SIZE OF NICKELS...
WIND GUSTS TO 50 MPH...

MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING
WEATHER CONDITIONS.

LAT...LON 3700 9948 3700 9943 3697 9943 3669 9998
      3685 10001 3699 10000 3701 9999

Local storm report, May 31, 12:36 AM CDT, 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1236 AM CDT TUE MAY 31 2011

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

1230 AM     NON-TSTM WND GST 3 W GOULD               34.67N 99.83W
05/31/2011  M60 MPH          HARMON             OK   MESONET

            HOLLIS MESONET RECORDED A 60 MPH WIND GUST.

&&

MA

Special weather statement, May 31, 12:39 AM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1239 AM CDT TUE MAY 31 2011

OKZ021-033-034-310600-
BECKHAM OK-GREER OK-HARMON OK-
1239 AM CDT TUE MAY 31 2011

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR BECKHAM...GREER AND HARMON
COUNTIES.

AT 1237 AM CDT...A STRONG THUNDERSTORM WAS LOCATED OVER
VINSON...MOVING NORTHEAST AT 50 MPH.  ANOTHER STORM WAS LOCATED
3 MILES EAST OF DELHI.  ADDITIONAL STORMS WERE FORMING SOUTHWEST
OF CHILDRESS...TEXAS AND THESE STORMS WILL MOVE INTO HARDEMAN
AND HARMON COUNTIES OVER THE NEXT HOUR.  AHEAD OF THESE STORMS
WINDS MAY GUSTS OVER 50 MPH FROM THE SOUTH.

HAZARDS INCLUDE...
HAIL UP TO THE SIZE OF NICKELS...
WIND GUSTS TO 50 MPH...

MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING
WEATHER CONDITIONS.

LAT...LON 3520 9996 3526 9939 3475 9965 3451 9970
      3460 9999

The office that day

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

Issued	Product	Office	Counties	Lasted
May 31, 12:12 AM CDT	Special Weather Statement	OUN	Beckham	18 min
May 31, 12:24 AM CDT	Special Weather Statement	OUN	Harper	36 min
May 31, 1:07 AM CDT	Special Weather Statement	OUN	Harmon	23 min
May 31, 1:23 AM CDT	Severe Thunderstorm Warning	OUN	Harmon, Jackson	52 min
May 31, 1:32 AM CDT	Special Weather Statement	OUN	Woods	28 min
May 31, 1:41 AM CDT	Special Weather Statement	OUN	Greer, Jackson	34 min
May 31, 2:13 AM CDT	Special Weather Statement	OUN	Jackson	32 min
May 31, 2:35 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Kiowa, Tillman	40 min
May 31, 3:41 AM CDT	Special Weather Statement	OUN	Stephens	34 min
May 31, 3:47 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Stephens	21 min
May 31, 5:06 AM CDT	Special Weather Statement	OUN	Cleveland, Grady, McClain	39 min
May 31, 12:58 AM CDT	Special Weather Statement	OUN	Hardeman	32 min

Nearby

Special Weather Statements in Oklahoma, 2011 Every special weather statement 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.