Alert archive / Oklahoma / Special Weather Statements in 2012

Special Weather Statement, NWS Norman, OK

August 4, 2012Harper County, Oklahoma

NWS Norman, OK issued this special weather statement at Aug 4, 2012, 10:22 PM CDT for Harper County, Oklahoma. It was in force for 38 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: Aug 4, 2012, 10:22 PM CDT (03:22 UTC)
Expired: Aug 4, 2012, 11:00 PM CDT
In force: 38 min
Issued by: NWS Norman, OK

County Harper County, OK

The radar

The Dodge City radar (KDDC), 105 km from the middle of the area, began a volume at 03:25 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

Lamont, OK (KLMN), launched 00:00Z, 3.4 hours before the alert went out and 178 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: 779 J/kg
Mixed-layer CIN: -262 J/kg
Mixed-layer LCL: 2670 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 240 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 Aug 4, 9:15 PM CDT, 1 hour 7 minutes earlier.

Area forecast discussion, Aug 4, 9:15 PM CDT, 1 hour 7 minutes before

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Hazardous weather outlook, Aug 4, 12:38 PM CDT, 9 hours 44 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1238 PM CDT SAT AUG 4 2012

OKZ004>048-050>052-TXZ083>090-051200-
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-
1238 PM CDT SAT AUG 4 2012

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

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

THUNDERSTORM OUTLOOK...
ISOLATED TO WIDELY SCATTERED THUNDERSTORMS WILL BE POSSIBLE LATE
THIS AFTERNOON AND TONIGHT ALONG A COLD FRONT OVER NORTHERN AND
CENTRAL OKLAHOMA. STRONG TO PERHAPS SEVERE WIND GUSTS MAY ACCOMPANY
SOME OF THE STORMS.

DISCUSSION...
A COLD FRONT WILL MOVE SLOWLY SOUTHWARD TODAY THROUGH OKLAHOMA AND
NORTH TEXAS. AHEAD OF THIS FRONT...VERY HOT TEMPERATURES COMBINED
WITH RELATIVELY DRY CONDITIONS WILL GENERATE LARGE TEMPERATURE
DEWPOINT SPREADS. ISOLATED STORMS ARE EXPECTED TO DEVELOP ALONG AND
TO THE NORTH OF THE COLD FRONT LATE THIS AFTERNOON DURING PEAK
HEATING. STRONG AND GUSTY WINDS CAN BE EXPECTED WITH ANY STORM THAT
DEVELOPS...AND A FEW SEVERE WIND GUSTS CANNOT BE RULED OUT WITH THE
STRONGEST STORMS. LIGHTNING MAY ALSO SPARK WILDFIRES IN THE VICINITY
OF THUNDERSTORMS...WHICH MAY SPREAD RAPIDLY WITH STRONG AND VARIABLE
WINDS IN AND AROUND STORMS. STORMS WILL LIKELY DIMINISH OVERNIGHT AS
DAYTIME HEATING IS LOST AND A STABLE AIRMASS BUILDS INTO THE AREA.

PROBABILITY TABLE...
VALID THROUGH 700 PM CDT SUNDAY AUG 5.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...70 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...40 PERCENT.

OTHER HAZARDOUS WEATHER...
GUSTY WINDS...LOW HUMIDITIES AND VERY HOT TEMPERATURES WILL CAUSE
VERY HIGH TO EXTREME FIRE DANGER FOR PARTS OF THE AREA. A RED FLAG
WARNING IS IN EFFECT THROUGH 10 PM. PLEASE REFER TO THE LATEST
VERSION OF THIS PRODUCT FOR MORE INFORMATION.

IN ADDITION...VERY HOT TEMPERATURES WILL PRODUCE DANGEROUS HEAT
INDICES FOR MUCH OF THE AREA. A HEAT ADVISORY IS IN EFFECT. PLEASE
REFER TO THE LATEST VERSION OF THIS PRODUCT FOR MORE INFORMATION.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY...

THUNDERSTORM OUTLOOK...
A FEW THUNDERSTORMS MAY OCCUR SUNDAY AS THE COLD FRONT CONTINUES TO
PUSH THROUGH THE AREA. SEVERE WEATHER IS NOT EXPECTED.

OTHER HAZARDOUS WEATHER...
VERY HOT TEMPERATURES WILL CONTINUE ON SUNDAY ACROSS SOUTHERN
OKLAHOMA AND WESTERN NORTH TEXAS. A HEAT ADVISORY REMAINS IN EFFECT
FOR THIS AREA THROUGH SUNDAY NIGHT. FOLLOW HEAT SAFETY GUIDELINES TO
PREVENT HEAT RELATED ILLNESS AND OR INJURY DURING THIS PERIOD OF VERY
HOT WEATHER.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AROUND 5
AM ON SUNDAY AUGUST 5.

AUSTIN/MBS

In the hours before

Special weather statement, Aug 4, 5:02 PM CDT, 5 hours 20 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
502 PM CDT SAT AUG 4 2012

OKZ008-013-042230-
KAY OK-NOBLE OK-
502 PM CDT SAT AUG 4 2012

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN KAY AND NOBLE
COUNTIES UNTIL 530 PM CDT...

AT 501 PM CDT...A STRONG THUNDERSTORM WAS LOCATED NEAR MARLAND...
MOVING NORTHEAST AT 40 MPH.

HAZARDS INCLUDE...
WIND GUSTS TO 40 MPH...

LOCATIONS IMPACTED INCLUDE...
PERRY...RED ROCK...MARLAND...SOONER LAKE AND CERES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS THUNDERSTORM WILL PRODUCE RAPID CHANGES TO WIND SPEED AND
DIRECTION...AND DANGEROUS LIGHTNING...THAT WILL HAMPER FIRE
FIGHTING EFFORTS. PLEASE ADVISE FIRE CREWS IN THE FIELD
IMMEDIATELY.

&&

LAT...LON 3676 9683 3674 9687 3661 9692 3656 9689
      3650 9703 3633 9703 3633 9702 3625 9743
      3658 9743 3674 9691 3673 9691 3668 9694
      3670 9703 3668 9707 3659 9705 3659 9694
      3674 9687
TIME...MOT...LOC 2201Z 240DEG 36KT 3656 9704

30

Special weather statement, Aug 4, 5:34 PM CDT, 4 hours 48 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
534 PM CDT SAT AUG 4 2012

OKZ012-013-020-042315-
GARFIELD OK-PAYNE OK-NOBLE OK-
534 PM CDT SAT AUG 4 2012

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN GARFIELD...
NORTHWESTERN PAYNE AND NOBLE COUNTIES UNTIL 615 PM CDT...

AT 531 PM CDT...ISOLATED THUNDERSTORMS ALONG A COLD FRONT EXTENDED
FROM NEAR SOONER LAKE TO DOUGLAS...MOVING EAST AT 35 MPH. THESE
STORMS WILL PRODUCE SOME GUSTY WINDS ALONG WITH SOME CLOUD-TO-GROUND
LIGHTNING. THIS LIGHTNING MAY CAUSE ADDITIONAL FIRE STARTS IF THEY
OCCUR IN RESEPTIVE FUELS. ALSO A WIND SHIFT WILL OCCUR WITH THE COLD
FRONT... WITH WINDS SHIFTING FROM THE SOUTH AND SOUTHWEST TO THE
NORTH AS THE FRONT MOVES THROUGH THE AREA.

HAZARDS INCLUDE...
WIND GUSTS TO 40 MPH...
CLOUD-TO-GROUND LIGHTNING...

LOCATIONS IMPACTED INCLUDE...
PERRY...GARBER...MORRISON...GLENCOE...COVINGTON...BILLINGS...RED
ROCK...MARLAND...BRECKENRIDGE...FAIRMONT...DOUGLAS...LUCIEN...
SOONER LAKE...HAYWARD AND CERES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS WIND SHIFT WILL AFFECT FIRE FIGHTING EFFORTS. PLEASE ADVISE
FIRE CREWS IN THE FIELD OF THE CHANGE IN WIND DIRECTION.

THESE THUNDERSTORMS WILL PRODUCE RAPID CHANGES TO WIND SPEED AND
DIRECTION...AND DANGEROUS LIGHTNING...THAT WILL HAMPER FIRE
FIGHTING EFFORTS. PLEASE ADVISE FIRE CREWS IN THE FIELD
IMMEDIATELY.

&&

LAT...LON 3657 9689 3655 9690 3654 9698 3650 9703
      3633 9704 3633 9692 3625 9692 3624 9690
      3622 9692 3616 9762 3617 9777 3649 9776
      3659 9708 3658 9697 3660 9691
TIME...MOT...LOC 2231Z 254DEG 31KT 3649 9697 3623 9760

30

Special weather statement, Aug 4, 6:32 PM CDT, 3 hours 50 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
632 PM CDT SAT AUG 4 2012

OKZ013-020-050015-
PAYNE OK-NOBLE OK-
632 PM CDT SAT AUG 4 2012

...SIGNIFICANT WEATHER ADVISORY FOR PAYNE AND SOUTHEASTERN NOBLE
COUNTIES UNTIL 715 PM CDT...

AT 630 PM CDT...ISOLATED THUNDERSTORMS WERE ALONG A COLD FRONT
THAT EXTENDED FROM MORRISON TO LAKE CARL BLACKWELL TO CRESCENT...
MOVING EAST AND SOUTHEAST AT 20 MPH. THIS FRONT WILL MOVE THROUGH
THE GLENCOE AREA BETWEEN 630 PM AND 7 PM WITH WINDS SHIFTING FROM
SOUTH TO NORTH AND THERE WILL BE CHANCE OF CLOUD-TO-GROUND LIGHTNING
AS WELL.

HAZARDS INCLUDE...
WIND GUSTS TO 40 MPH...
CLOUD-TO-GROUND LIGHTNING...

LOCATIONS IMPACTED INCLUDE...
STILLWATER...PERRY...YALE...MORRISON...GLENCOE...RIPLEY...LAKE
MCMURTRY...LAKE CARL BLACKWELL AND INGALLS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS WIND SHIFT WILL AFFECT FIRE FIGHTING EFFORTS. PLEASE ADVISE
FIRE CREWS IN THE FIELD OF THE CHANGE IN WIND DIRECTION.

THESE THUNDERSTORMS WILL PRODUCE RAPID CHANGES TO WIND SPEED AND
DIRECTION...AND DANGEROUS LIGHTNING...THAT WILL HAMPER FIRE
FIGHTING EFFORTS. PLEASE ADVISE FIRE CREWS IN THE FIELD
IMMEDIATELY.

&&

LAT...LON 3633 9703 3634 9693 3625 9692 3624 9682
      3616 9682 3615 9662 3599 9669 3600 9730
      3601 9731 3600 9734 3634 9732 3634 9704
TIME...MOT...LOC 2330Z 296DEG 17KT 3623 9700 3613 9726 3601 9756

30

Special weather statement, Aug 4, 10:22 PM CDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 5, 1:25 AM CDT	Special Weather Statement	OUN	Kay	35 min

Nearby

Special Weather Statements in Oklahoma, 2012 Every special weather statement 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.