Alert archive / Oklahoma / Special Weather Statements in 2012

Special Weather Statement, NWS Norman, OK

April 8, 2012Johnston County, Oklahoma

NWS Norman, OK issued this special weather statement at Apr 8, 2012, 2:57 AM CDT for Johnston County, Oklahoma. It was in force for 48 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, 2:57 AM CDT (07:57 UTC)
Expired: Apr 8, 2012, 3:45 AM CDT
In force: 48 min
Issued by: NWS Norman, OK

County Johnston County, OK

The radar

The Norman radar (KTLX), 142 km from the middle of the area, began a volume at 08:00 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, 8.0 hours before the alert went out and 137 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: 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 7, 6:46 PM CDT, 8 hours 11 minutes earlier.

Area forecast discussion, Apr 7, 6:46 PM CDT, 8 hours 11 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
646 PM CDT SAT APR 7 2012

.AVIATION...
08/00Z TAFS...MVFR/VFR CEILINGS WILL BE WIDESPREAD THROUGH
TOMORROW...WITH LOWEST CEILINGS DOWN NEAR THE RED RIVER. SCATTERED
SHOWERS AND POSSIBLY A FEW THUNDERSTORMS WILL BE POSSIBLE FOR THE
FIRST 2 TO 4 HOURS OF FORECAST MAINLY NEAR KSPS AND KLAW JUST NORTH
OF THE COLD FRONT. COULD SEE CEILINGS FALL TO IFR TOMORROW MORNING
NEAR AND SOUTH OF KHBR/KLAW WITH DEVELOPING MOIST UPSLOPE FLOW BUT
WILL NOT GO THAT LOW WITH THIS FORECAST CYCLE.

&&

.DISCUSSION...
THE FRONT MOVING THROUGH OKLAHOMA NOW IS EXPECTED TO PRODUCE MORE
NUMEROUS SHOWERS AND THUNDERSTORMS LATE THIS AFTERNOON IN
NORTHERN TEXAS AND SOUTH CENTRAL OKLAHOMA WHERE INSTABILITY IS
MODERATELY HIGH. BUT THE FRONT IS FORECAST TO STALL IN NORTH TEXAS
TONIGHT AND PROVIDE A CHANCE FOR RAIN AROUND THE RED RIVER INTO
SUNDAY. MOST DAYS THIS WEEK HAVE A CHANCE FOR RAIN DRIVEN BY
ANOTHER FRONT ON MONDAY THEN YET ANOTHER ON WEDNESDAY. GENERAL
BOUNDARY LAYER UPSLOPE MAY CONTRIBUTE TO RATHER COOL AND CLOUDY
IN WESTERN OKLAHOMA SOME DAYS. THE INTERACTIONS OF THE FRONTS AND
UPSLOPE WILL BE WORKING UNDER A MORE COMPLICATE UPPER PATTER OF
WEAK RIDGING TO THE WEST OF OKLAHOMA AND FAST NORTHWEST FLOW TO
THE EAST. SO THE FORECAST IS BASED MOSTLY ON THE PROXIMITY TO
THESE FRONTS AND AMPLE RESIDENT MOISTURE. ANY TIMING AND INTENSITY
COULD BE MODULATED BY ANY WEAK WAVE IN THE FAST NORTHWEST FLOW
THAT WILL REMAIN NEARBY TO THE NORTH AND EAST AT LEAST THROUGH
MID-WEEK. A STRONGER STORM SYSTEM IS EXPECTED NEXT WEEKEND.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  53  72  55  75 /  30  20  20  30
HOBART OK         50  72  55  76 /  30  20  20  30
WICHITA FALLS TX  58  74  60  78 /  40  40  20  30
GAGE OK           42  70  49  76 /  10  10  20  30
PONCA CITY OK     44  71  50  73 /  10  10  20  20
DURANT OK         60  76  59  78 /  40  40  20  30

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...NONE.
TX...NONE.
&&

25/09

Hazardous weather outlook, Apr 7, 8:00 PM CDT, 6 hours 57 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, 1:48 AM CDT, 1 hour 9 minutes before

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Special weather statement, Apr 8, 1:58 AM CDT, 59 minutes before

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Special weather statement, Apr 8, 2:00 AM CDT, 57 minutes before

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Special weather statement, Apr 8, 2:28 AM CDT, 29 minutes before

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Special weather statement, Apr 8, 2:33 AM CDT, 24 minutes before

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Special weather statement, Apr 8, 2:57 AM 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
Apr 8, 12:50 AM CDT	Special Weather Statement	OUN	Murray	25 min
Apr 8, 1:01 AM CDT	Severe Thunderstorm Warning	OUN	Garvin, Johnston, Murray, Pontotoc	59 min
Apr 8, 1:10 AM CDT	Special Weather Statement	OUN	Cotton	50 min
Apr 8, 1:17 AM CDT	Special Weather Statement	OUN	Garvin	28 min
Apr 8, 1:21 AM CDT	Special Weather Statement	OUN	Murray	24 min
Apr 8, 1:48 AM CDT	Special Weather Statement	OUN	Murray	42 min
Apr 8, 1:58 AM CDT	Special Weather Statement	OUN	Stephens	32 min
Apr 8, 2:00 AM CDT	Special Weather Statement	OUN	Pontotoc	30 min
Apr 8, 2:28 AM CDT	Special Weather Statement	OUN	Cotton	47 min
Apr 8, 2:33 AM CDT	Special Weather Statement	OUN	Pontotoc	27 min
Apr 8, 4:08 AM CDT	Special Weather Statement	OUN	Marshall	52 min
Apr 8, 4:58 AM CDT	Special Weather Statement	OUN	Marshall	47 min
Apr 8, 5:43 AM CDT	Special Weather Statement	OUN	Bryan	32 min
Apr 8, 8:12 AM CDT	Special Weather Statement	OUN	Murray	48 min
Apr 8, 8:21 AM CDT	Areal Flood Advisory	OUN	Murray	114 min
Apr 8, 8:40 AM CDT	Flash Flood Warning	OUN	Murray	2 hr
Apr 8, 8:45 AM CDT	Areal Flood Advisory	OUN	Love, Marshall	3 hr
Apr 8, 9:45 AM CDT	Areal Flood Advisory	OUN	Carter, Johnston, Marshall, Murray	3 hr
Apr 8, 10:28 AM CDT	Special Weather Statement	OUN	Seminole	47 min
Apr 8, 10:59 AM CDT	Areal Flood Advisory	OUN	Murray	3 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.