Alert archive / Oklahoma / Special Weather Statements in 2012

Special Weather Statement, NWS Norman, OK

February 28, 2012Seminole County, Oklahoma

NWS Norman, OK issued this special weather statement at Feb 28, 2012, 11:13 PM CST for Seminole County, Oklahoma. It was in force for 17 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: Feb 28, 2012, 11:13 PM CST (05:13 UTC)
Expired: Feb 28, 2012, 11:30 PM CST
In force: 17 min
Issued by: NWS Norman, OK

County Seminole County, OK

The radar

The Norman radar (KTLX), 82 km from the middle of the area, began a volume at 05:15 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, 5.2 hours before the alert went out and 202 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: 386 J/kg
Mixed-layer CIN: -76 J/kg
Mixed-layer LCL: 660 m above ground
0-6 km bulk shear: 77 kt
0-1 km storm-relative helicity: 369 m²/s²
0-3 km storm-relative helicity: 461 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 2.3

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 Feb 28, 5:32 PM CST, 5 hours 41 minutes earlier.

Area forecast discussion, Feb 28, 5:32 PM CST, 5 hours 41 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
532 PM CST TUE FEB 28 2012

.AVIATION...
THE MVFR-LEVEL CEILINGS OVER THE E HALF OF OK WILL DISSIPATED
QUICKLY THIS EVENING...AND BY 00Z...NONE OF OUR TAF SITES SHOULD
HAVE A CEILING. THE EXCEPTION TO THIS IS WHERE TSRA OCCUR. IT
APPEARS THAT TSRA WILL FORM A THIN LINE OVER KS...THEN BUILD S
INTO OK...PROBABLY NEAR OR JUST E OF I-35. MEANWHILE...THE DRY
LINE ALONG THE TX/OK BORDER WILL CONTINUE TO MARCH E...BRINGING DU
FROM TX AND NM INTO W OK. WINDS WILL SPIKE BRIEFLY BEHIND THE DRY
LINE OVER W OK...BUT AS THE PRESSURE GRADIENT RELAXES AND THE
NIGHTTIME INVERSION SETS IN...WINDS SHOULD DECREASE FAIRLY QUICKLY
TOWARD 06Z. EXPECT MAINLY CLR SKIES AND LIGHT W WINDS FOR THE
REMAINDER OF THE PERIOD.

&&

.PREV DISCUSSION... /ISSUED 323 PM CST TUE FEB 28 2012/

DISCUSSION...
A POTENT UPPER LEVEL STORM SYSTEM AND ASSOCIATED SFC LOW CONTINUE
TO TRACK NORTHEASTWARD INTO THE CENTRAL PLAINS. WIDESPREAD SHOWER
ACTIVITY IN WARM ADVECTION REGIME HAS ENDED ACROSS CENTRAL AND
WESTERN OKLAHOMA AS MID LEVEL DRY AIR HAS BEGUN OVERSPREADING
WESTERN PARTS OF THE FA. THE DRYLINE HAS BEEN SLOW TO MOVE THIS
AFTERNOON...CURRENTLY STRETCHING FROM THE EASTERN OKLAHOMA
PANHANDLE SOUTHWARD INTO CENTRAL TEXAS. STILL...STRONG SOUTH
WINDS HAVE DEVELOPED AHEAD OF THE DRYLINE AND IT IS EXPECTED TO
REACH OUR WESTERN OKLAHOMA COUNTIES IN THE NEXT COUPLE OF HOURS.
FREQUENT WIND GUSTS OVER 50 MPH HAVE BEEN OBSERVED BEHIND THE
DRYLINE ALONG WITH VERY LOW HUMIDITIES. AS SUCH...WILDFIRE
POTENTIAL WILL BECOME EXTREME OVER WESTERN OKLAHOMA AND ADJACENT
COUNTIES IN WESTERN NORTH TEXAS THROUGH THE EVENING.

CONVECTIVE POTENTIAL ALONG THE DRYLINE THIS EVENING REMAINS
UNCERTAIN...BUT IT DOES APPEAR THAT AT LEAST A FEW STORMS WILL
INITIATE ACROSS CENTRAL OKLAHOMA THIS EVENING. ONLY LIMITING
FACTOR NOW APPEARS TO BE WEAK CAPPING INVERSION AND SOMEWHAT
MODEST INSTABILITY...THOUGH RECENT NAM/GFS BUFR SOUNDINGS DO SHOW
THE CAP ERODING THROUGH THE EVENING. ANY STORM THAT MANAGES TO
DEVELOP WILL HAVE A CHANCE OF BECOMING SEVERE...WITH LARGE HAIL
AND DAMAGING WINDS...THOUGH CONVECTIVE COVERAGE IS EXPECTED TO BE
LIMITED. AS A COLD FRONT SHIFTS SOUTHEASTWARD AND OVERTAKES THE
DRYLINE TONIGHT...WILL SEE AN EXPANSION IN CONVECTIVE ACTIVITY
WITH CONTINUED LOW PROBABILITIES OF SEVERE
THUNDERSTORMS...PARTICULARLY ACROSS EASTERN OKLAHOMA.

THE WEATHER PATTERN QUIETS DOWN TOMORROW WITH MILD AND DRY
CONDITIONS EXPECTED ACROSS THE SOUTHERN PLAINS. EVEN WARMER
WEATHER IS ANTICIPATED FOR THURSDAY AS BREEZY DOWNSLOPE WINDS
OVERSPREAD THE AREA. THE COMBINATION OF ABOVE AVERAGE
TEMPERATURES AND VERY DRY AIR WILL GENERATE VERY HIGH TO EXTREME
WILDFIRE POTENTIAL ACROSS WESTERN OKLAHOMA AND SOME FIRE WEATHER
HEADLINES MAY BE NEEDED THURSDAY IF THIS TREND CONTINUES. THE
PATTERN WILL REMAIN PROGRESSIVE WITH ANOTHER COLD FRONTAL PASSAGE
LATE THURSDAY NIGHT INTO FRIDAY. THIS SHOULD BRING US BACK TO
NEAR AVERAGE TEMPS BY FRIDAY WITH A CHANCE OF RAIN ACROSS MAINLY
SOUTHEAST OKLAHOMA.

BEYOND FRIDAY...TEMPERATURES WILL BE ON THE RISE THROUGH THE
WEEKEND AND EVEN INTO EARLY NEXT WEEK WITH DRY CONDITIONS
PERSISTING ACROSS THE SOUTHERN PLAINS. THE NEXT SHOT AT RAIN WILL
COME MID TO LATE NEXT WEEK AS A BROAD TROUGH MOVES INTO THE
WESTERN U.S.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  40  69  40  74 /  30   0   0   0
HOBART OK         37  72  38  75 /  10   0   0   0
WICHITA FALLS TX  43  77  43  83 /  10   0   0   0
GAGE OK           33  71  33  74 /  10   0   0   0
PONCA CITY OK     39  64  40  73 /  30   0   0   0
DURANT OK         53  74  45  80 /  40  10   0   0

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...WIND ADVISORY UNTIL 7 PM CST THIS EVENING FOR OKZ004>006-009>011-
     014>016-021-022-033>036.

     RED FLAG WARNING UNTIL 7 PM CST THIS EVENING FOR OKZ004-005-009-
     010-014-021-033-034-036.

TX...WIND ADVISORY UNTIL 7 PM CST THIS EVENING FOR TXZ083-084-087.

     RED FLAG WARNING UNTIL 7 PM CST THIS EVENING FOR TXZ083-084-087.

&&

11/23/23

Hazardous weather outlook, Feb 28, 10:00 PM CST, 1 hour 13 minutes before

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In the hours before

Special weather statement, Feb 28, 7:31 PM CST, 3 hours 42 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
731 PM CST TUE FEB 28 2012

OKZ005>007-011-012-290200-
GARFIELD OK-GRANT OK-MAJOR OK-WOODS OK-ALFALFA OK-
731 PM CST TUE FEB 28 2012

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR ALFALFA...GARFIELD...
GRANT...MAJOR AND WOODS COUNTIES.

AT 731 PM CST...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM 4
MILES SOUTHEAST OF WALDRON...TO CHEROKEE...TO 5 MILES WEST OF
ALINE...MOVING SOUTHEAST AT 45 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 3698 9766 3651 9790 3620 9841 3651 9870
      3701 9824 3701 9782

CMS

Local storm report, Feb 28, 7:52 PM CST, 3 hours 21 minutes before

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Local storm report, Feb 28, 8:54 PM CST, 2 hours 19 minutes before

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Special weather statement, Feb 28, 9:18 PM CST, 1 hour 55 minutes before

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Special weather statement, Feb 28, 10:32 PM CST, 41 minutes before

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Special weather statement, Feb 28, 11:13 PM CST, 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
Feb 28, 7:03 PM CST	Special Weather Statement	OUN	Alfalfa, Major, Woods	27 min
Feb 28, 7:31 PM CST	Special Weather Statement	OUN	Alfalfa, Grant	29 min
Feb 28, 7:44 PM CST	Severe Thunderstorm Warning	OUN	Alfalfa, Grant	31 min
Feb 28, 8:14 PM CST	Severe Thunderstorm Warning	OUN	Grant, Kay	61 min
Feb 28, 9:18 PM CST	Special Weather Statement	OUN	Noble, Payne	42 min
Feb 28, 10:32 PM CST	Special Weather Statement	OUN	Carter, Coal, Hughes, Johnston, Marshall, Murray and 2 more	43 min
Feb 29, 4:14 AM CST	Fire Weather Watch	OUN	Alfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 26 more	23 hr

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.