Alert archive / Oklahoma / Special Weather Statements in 2012

Special Weather Statement, NWS Norman, OK

April 8, 2012Marshall County, Oklahoma

NWS Norman, OK issued this special weather statement at Apr 8, 2012, 4:08 AM CDT for Marshall County, Oklahoma. It was in force for 52 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
Apr 8, 2012, 4:08 AM CDT (09:08 UTC)
Expired
Apr 8, 2012, 5:00 AM CDT
In force
52 min
Issued by
NWS Norman, OK

County Marshall County, OK

The radar

The Norman radar (KTLX), 145 km from the middle of the area, began a volume at 09:11 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

Norman, OK (KOUN), launched 00:00Z, 9.1 hours before the alert went out and 138 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-pSkew-T log-p diagram, Norman, OK at 00:00Z on 2012-04-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 00:00Z on 2012-04-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -30 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1 J/kg
Mixed-layer CIN
-377 J/kg
Mixed-layer LCL
484 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
-30 m²/s²
0-3 km storm-relative helicity
196 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.4

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 Apr 8, 4:08 AM CDT, 0 minutes earlier.

Area forecast discussion, Apr 8, 4:08 AM CDT, 0 minutes before
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Hazardous weather outlook, Apr 7, 8:00 PM CDT, 8 hours 8 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
800 PM CDT SAT APR 7 2012

OKZ004>048-050>052-TXZ083>090-081000-
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-
800 PM CDT SAT APR 7 2012

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

.DAY ONE...TONIGHT...

THUNDERSTORM OUTLOOK...
A FEW STRONG THUNDERSTORMS ARE POSSIBLE BUT SEVERE WEATHER IS
UNLIKELY.

DISCUSSION...
A COLD FRONT WILL CONTINUE TO PUSH ACROSS SOUTHEAST OKLAHOMA
TONIGHT.  SCATTERED SHOWERS AND A FEW THUNDERSTORMS WILL BE
LIKELY NORTH OF THE FRONT...ESPECIALLY ACROSS THE SOUTHERN THIRD
OF OKLAHOMA AND WESTERN NORTH TEXAS.  ENOUGH ELEVATED INSTABILITY
WILL BE AVAILABLE FOR A FEW STRONG STORMS WHICH MAY PRODUCE
HAIL UP TO THE SIZE OF DIMES.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT SUNDAY APR 8.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NEWS NORMAN COUNTY WARNING AREA...70 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...30 PERCENT.

OTHER HAZARDOUS WEATHER...
NONE.

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

THUNDERSTORM OUTLOOK...
THUNDERSTORM CHANCES WILL CONTINUE THROUGH THE WEEKEND AND INTO
NEXT WEEK. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS MONDAY
AFTERNOON AND EVENING ACROSS MUCH OF OKLAHOMA AND NORTH TEXAS. THE
MAIN THREATS WILL BE HAIL AND DAMAGING WINDS. THERE IS ALSO A
SIGNIFICANT RISK OF SEVERE WEATHER AGAIN ON THURSDAY.

OTHER HAZARDOUS WEATHER...
NONE.

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

In the hours before

Special weather statement, Apr 8, 1:58 AM CDT, 2 hours 10 minutes before
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Special weather statement, Apr 8, 2:00 AM CDT, 2 hours 8 minutes before
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Special weather statement, Apr 8, 2:28 AM CDT, 1 hour 40 minutes before
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Special weather statement, Apr 8, 2:33 AM CDT, 1 hour 35 minutes before
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Special weather statement, Apr 8, 2:57 AM CDT, 1 hour 11 minutes before
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Special weather statement, Apr 8, 4:08 AM CDT, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
408 AM CDT SUN APR 8 2012

OKZ047-051-052-081000-
BRYAN OK-MARSHALL OK-JOHNSTON OK-
408 AM CDT SUN APR 8 2012

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN BRYAN...MARSHALL
AND JOHNSTON COUNTIES UNTIL 500 AM CDT...

AT 407 AM CDT...A STRONG THUNDERSTORM WAS LOCATED NEAR MADILL...
MOVING EAST AT 20 MPH.

HAZARDS INCLUDE...
HAIL UP TO ONE-HALF INCH DIAMETER...
WIND GUSTS TO 40 MPH...

LOCATIONS IMPACTED INCLUDE...
MADILL...TISHOMINGO...OAKLAND...RAVIA...MILBURN...FILLMORE...NIDA...
RUSSETT AND LITTLE CITY.

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

LAT...LON 3398 9690 3418 9689 3436 9650 3407 9640
TIME...MOT...LOC 0907Z 254DEG 17KT 3412 9678

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 8, 12:50 AM CDTSpecial Weather StatementOUNMurray25 min
Apr 8, 1:01 AM CDTSevere Thunderstorm WarningOUNGarvin, Johnston, Murray, Pontotoc59 min
Apr 8, 1:10 AM CDTSpecial Weather StatementOUNCotton50 min
Apr 8, 1:17 AM CDTSpecial Weather StatementOUNGarvin28 min
Apr 8, 1:21 AM CDTSpecial Weather StatementOUNMurray24 min
Apr 8, 1:48 AM CDTSpecial Weather StatementOUNMurray42 min
Apr 8, 1:58 AM CDTSpecial Weather StatementOUNStephens32 min
Apr 8, 2:00 AM CDTSpecial Weather StatementOUNPontotoc30 min
Apr 8, 2:28 AM CDTSpecial Weather StatementOUNCotton47 min
Apr 8, 2:33 AM CDTSpecial Weather StatementOUNPontotoc27 min
Apr 8, 2:57 AM CDTSpecial Weather StatementOUNJohnston48 min
Apr 8, 4:58 AM CDTSpecial Weather StatementOUNMarshall47 min
Apr 8, 5:43 AM CDTSpecial Weather StatementOUNBryan32 min
Apr 8, 8:12 AM CDTSpecial Weather StatementOUNMurray48 min
Apr 8, 8:21 AM CDTAreal Flood AdvisoryOUNMurray114 min
Apr 8, 8:40 AM CDTFlash Flood WarningOUNMurray2 hr
Apr 8, 8:45 AM CDTAreal Flood AdvisoryOUNLove, Marshall3 hr
Apr 8, 9:45 AM CDTAreal Flood AdvisoryOUNCarter, Johnston, Marshall, Murray3 hr
Apr 8, 10:28 AM CDTSpecial Weather StatementOUNSeminole47 min
Apr 8, 10:59 AM CDTAreal Flood AdvisoryOUNMurray3 hr

Nearby

Special Weather Statements in Oklahoma, 2012Every 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.