Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 69, NWS Norman, OK

March 27, 2009Garfield County, Noble County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Mar 27, 2009, 9:09 AM CDT for Garfield County, Noble County, Oklahoma. It was in force for 36 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: Mar 27, 2009, 9:09 AM CDT (14:09 UTC)
Expired: Mar 27, 2009, 9:45 AM CDT
In force: 36 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Garfield County, OK, Noble County, OK

The radar

The Vance AFB radar (KVNX), 68 km from the middle of the area, began a volume at 14:09 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 12:00Z, 2.2 hours before the alert went out and 26 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: 502 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 192 m²/s²
0-3 km storm-relative helicity: 494 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Mar 27, 4:20 AM CDT, 4 hours 49 minutes earlier.

Area forecast discussion, Mar 27, 4:20 AM CDT, 4 hours 49 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
420 AM CDT FRI MAR 27 2009

.DISCUSSION...
THE PREVIOUS WINTER STORM WARNING WILL BE UPGRADED TO A BLIZZARD
WARNING AND THE PREVIOUS WATCH WILL BE EXPANDED AND CONVERTED TO A
WINTER STORM WARNING. BLIZZARD CRITERIA WILL LIKELY BE MET BUT NOT
FOR THE ENTIRE WARNING PERIOD. GIVEN VERY SIGNIFICANT SNOW
ACCUMULATIONS AND BLOWING/DRIFTING EXPECTED...THE HARDER BLIZZARD
WARNING SHOULD GET RIGHT MESSAGE ACROSS TO THOSE ACROSS NORTHWEST
PARTS OF THE STATE AND IT WILL BLEND WELL WITH SURROUND WFO
HIGHLIGHTS. A FEW COUNTIES WERE ADDED FOR THE NEW WARNING. THIS
WILL INCORPORATE AREAS FROM LAWTON...UP THROUGH CHICKASHA...
NORMAN...AND SHAWNEE. GOING TO BE A TIGHT GRADIENT ON SOUTHERN
END OF HEAVIER ACCUMULATIONS...SO IT IS POSSIBLE THAT THE SOUTHERN
PORTIONS OF THE MOST SOUTHERN COUNTIES IN THE WARNING MAY NOT GET
MUCH SNOW. ADVISORIES CANNOT BE RULED OUT LATER TODAY JUST SOUTH
OF NEW WARNING...SOMETHING THAT THE DAY SHIFT WILL MONITOR AND
TAKE ACTION IF NEEDED. AS FAR AS TIMING...WE WILL START THE NEW
WARNING A LITTLE LATER...THIS EVENING THROUGH TOMORROW...ROUGHLY
FROM THE I-35 CORRIDOR EAST AND NORTHEAST. CHANGE OVER IN THE
OKLAHOMA CITY METRO AREA WILL LIKELY WAIT UNTIL MID-LATE AFTERNOON
WITH ACCUMULATIONS NOT EXPECTED UNTIL THIS EVENING. THIS BEING
TYPED WITH THE CAVEAT THAT WITH INTENSIFYING SYSTEMS SUCH AS
THIS...THE COLD AIR CAN SURGE FARTHER AND FASTER THAN PROGD.
STILL...A CHANGE OVER IN THE 4 TO 7 PM TIME-FRAME STILL LOOKS
CAUTIOUSLY REASONABLE.

MODEL DERIVED SNOWFALL TOTALS STILL OFF OF THE CHARTS (25 TO 30
INCHES ACROSS NORTHWEST 1/4 OF OKLAHOMA). WE INCREASED THEM A BIT ON
SOUTHERN FRINGE OF WARNING AND ACROSS NORTHWEST OKLAHOMA BASED ON
LATEST SREF...HPC COORD...AND OTHER WFO GRIDDED FORECASTS.
DEFORMATION/PIVOT POINT OF MID-LEVEL FLOW WILL ALLOW FOR A BAND OF
WELL OVER A FOOT SOMEWHERE...CURRENTLY MOST LIKELY ACROSS
NORTHWEST OKLAHOMA UP INTO SOUTH-CENTRAL KANSAS.

REST OF PACKAGE...SUNDAY AND BEYOND...WAS DERIVED FROM GFS
INITIALIZATIONS WITH VERY LITTLE MODIFICATIONS.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  46  30  39  26 /  90 100  60   0
HOBART OK         39  28  40  28 /  90  90  30   0
WICHITA FALLS TX  50  31  46  33 /  60  50  10   0
GAGE OK           31  22  36  22 / 100 100  30   0
PONCA CITY OK     39  30  36  21 / 100 100  80   0
DURANT OK         60  34  46  35 /  70  50  30   0

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...WINTER STORM WARNING FROM 7 PM THIS EVENING TO 7 PM CDT SATURDAY
     FOR OKZ008-013-019-020-025-026-028>030.

     WINTER STORM WARNING FROM 1 PM THIS AFTERNOON TO 1 PM CDT
     SATURDAY FOR OKZ018-022>024-027-033>036-038.

     BLIZZARD WARNING FROM 7 AM THIS MORNING TO 1 PM CDT SATURDAY FOR
     OKZ004>007-009>012-014>017-021.

TX...WINTER STORM WARNING FROM 1 PM THIS AFTERNOON TO 1 PM CDT
     SATURDAY FOR TXZ083.

&&

26/11

Hazardous weather outlook, Mar 27, 7:41 AM CDT, 1 hour 28 minutes before

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In the hours before

Special weather statement, Mar 27, 6:58 AM CDT, 2 hours 11 minutes before

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Local storm report, Mar 27, 7:08 AM CDT, 2 hours 1 minute before

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Special weather statement, Mar 27, 7:13 AM CDT, 1 hour 56 minutes before

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Special weather statement, Mar 27, 7:33 AM CDT, 1 hour 36 minutes before

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Special weather statement, Mar 27, 7:52 AM CDT, 1 hour 17 minutes before

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Special weather statement, Mar 27, 8:42 AM CDT, 27 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
Mar 27, 4:41 AM CDT	Blizzard Warning	OUN	Alfalfa, Beckham, Blaine, Custer, Dewey, Ellis and 7 more	32 hr
Mar 27, 4:41 AM CDT	Winter Storm Warning	OUN	Caddo, Canadian, Cleveland, Comanche, Grady, Greer and 13 more	36 hr
Mar 27, 5:43 AM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Roger Mills, Washita	47 min
Mar 27, 11:00 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Kiowa, Washita	45 min
Mar 27, 11:45 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Garvin, McClain, Pottawatomie	45 min
Mar 27, 12:27 PM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie, Seminole	25 min
Mar 27, 2:56 PM CDT	Winter Weather Advisory	OUN	Caddo, Canadian, Cleveland, Comanche, Cotton, Garvin and 16 more	26 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2009 Every severe thunderstorm warning in 2009

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.