Alert archive / Oklahoma / Special Weather Statements in 2012

Special Weather Statement, NWS Tulsa, OK

April 19, 2012Nowata County, Oklahoma

NWS Tulsa, OK issued this special weather statement at Apr 19, 2012, 10:38 PM CDT for Nowata County, Oklahoma. It was in force for 37 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 19, 2012, 10:38 PM CDT (03:38 UTC)
Expired: Apr 19, 2012, 11:15 PM CDT
In force: 37 min
Issued by: NWS Tulsa, OK

County Nowata County, OK

The radar

The Tulsa radar (KINX), 79 km from the middle of the area, began a volume at 03:41 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, 3.6 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: 959 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 1497 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: -4 m²/s²
0-3 km storm-relative helicity: 3 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.5

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 Tulsa, OK wrote its last area forecast discussion before this special weather statement went out at Apr 19, 9:36 PM CDT, 1 hour 2 minutes earlier.

Area forecast discussion, Apr 19, 9:36 PM CDT, 1 hour 2 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
936 PM CDT THU APR 19 2012

...UPDATE...

.DISCUSSION...
COLD FRONT HAS ENTERED OSAGE AND PAWNEE COUNTIES RECENTLY AND
REMAINS LARGELY ON TRACK WITH THE LATEST GUIDANCE TIMING. 00Z
KOUN/KSGF SOUNDINGS COMPOSITE FOR THE IMMEDIATE AREA SHOW THE
MARKED DECREASE IN ELEVATED INSTABILITY WITH EASTWARD EXTENT...AND
CONVECTION THUS FAR HAS SHOWN THAT TREND ALSO. THE NORTHERN EXTENT
OF THE CONVECTION ALONG THE FRONT ALSO LOOKS LESS LIKELY TO FILL
IN AND UPDATED POPS WILL BE ADJUSTED ACCORDINGLY. IN LINE WITH
VARIOUS SHORT TERM MODEL TRENDS THE SOUTHERN REGION OF STORMS IS
LIKELY TO DOMINATE AND HAVE INCREASED POPS FOR PORTIONS OF SE OK
FOR LATER TONIGHT. TEMPS LOOK ON TRACK WITH COLD AIR ARRIVING IN
TIME FOR THE NEEDED COOLING.

&&

.PRELIMINARY POINT TEMPS/POPS...
TUL   51  62  40  68 /  60  20   0   0
FSM   58  62  44  68 /  40  60  10   0
MLC   57  62  44  68 /  70  50  10   0
BVO   49  63  39  69 /  30  20   0   0
FYV   53  57  37  64 /  50  60  10   0
BYV   54  57  40  63 /  50  60  10   0
MKO   54  61  41  68 /  60  30   0   0
MIO   51  61  38  66 /  60  20   0   0
F10   55  62  43  68 /  70  30  10   0
HHW   59  64  45  68 /  70  60  10   0

&&

.TSA WATCHES/WARNINGS/ADVISORIES...
OK...NONE.
AR...NONE.
&&

SHORT TERM...07

Hazardous weather outlook, Apr 19, 9:47 PM CDT, 51 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
947 PM CDT THU APR 19 2012

ARZ001-002-010-011-019-020-029-OKZ049-053>076-201000-
ADAIR OK-BENTON AR-CARROLL AR-CHEROKEE OK-CHOCTAW OK-CRAIG OK-
CRAWFORD AR-CREEK OK-DELAWARE OK-FRANKLIN AR-HASKELL OK-LATIMER OK-
LE FLORE OK-MADISON AR-MAYES OK-MCINTOSH OK-MUSKOGEE OK-NOWATA OK-
OKFUSKEE OK-OKMULGEE OK-OSAGE OK-OTTAWA OK-PAWNEE OK-PITTSBURG OK-
PUSHMATAHA OK-ROGERS OK-SEBASTIAN AR-SEQUOYAH OK-TULSA OK-WAGONER OK-
WASHINGTON OK-WASHINGTON AR-
947 PM CDT THU APR 19 2012

THIS OUTLOOK IS FOR NORTHWEST AND WEST CENTRAL ARKANSAS AS WELL AS
MUCH OF EASTERN OKLAHOMA.

.DAY ONE...TONIGHT.

SEVERE THUNDERSTORM.
	RISK...LIMITED.
	AREA...PRIMARILY SOUTHEAST OKLAHOMA.
	ONSET...AFTER MIDNIGHT.

DISCUSSION...
A LIMITED RISK OF SEVERE WEATHER WILL CONTINUE INTO THE EARLY
MORNING HOURS AS STORMS DEVELOP ALONG A COLD FRONT.  SLIGHTLY
HIGHER INSTABILITY WILL REMAIN ACROSS SOUTHEAST OKLAHOMA WHERE
WARNING PROBABILITIES WILL REMAIN SLIGHTLY HIGHER OVERNIGHT.
OVERALL...THE RISK OF SEVERE WEATHER IS LIMITED AND FOCUSED
ON A RISK OF ISOLATED LARGE HAIL WITH THE STRONGEST STORMS.

SPOTTER AND EMERGENCY MANAGEMENT ACTION STATEMENT...
LOCAL SPOTTER ACTIVATION MAY BE NEEDED.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.
FRIDAY...THUNDERSTORM POTENTIAL...HIGH WIND POTENTIAL.
SATURDAY THROUGH WEDNESDAY...NO HAZARDS.

EXTENDED DISCUSSION...
THUNDERSTORMS WILL BE ONGOING EARLY FRIDAY ACROSS FAR
EASTERN OKLAHOMA AND NORTHWEST ARKANSAS...WITH THESE STORMS
SHIFTING SOUTHEASTWARD DURING THE DAY.  BREEZY NORTH WINDS WILL
DEVELOP BEHIND THE PASSING COLD FRONT WITH NOTICEABLY COOLER
TEMPERATURES.  DRY AND MILD WEATHER WILL PREVAIL THIS WEEKEND
INTO EARLY NEXT WEEK.

WWW.SRH.NOAA.GOV/TULSA CONTAINS ADDITIONAL INFORMATION.

In the hours before

Special weather statement, Apr 19, 10:38 PM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
1038 PM CDT THU APR 19 2012

OKZ056-200415-
NOWATA OK-
1038 PM CDT THU APR 19 2012

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
SIGNIFICANT WEATHER ADVISORY EFFECTIVE UNTIL 1115 PM CDT
FOR THE FOLLOWING COUNTY...

IN NORTHEAST OKLAHOMA
     CENTRAL NOWATA

AT 1039 PM CDT...A STRONG THUNDERSTORM WAS LOCATED OVER LENAPAH...
MOVING EAST AT 25 MPH.

THE THIS STORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE
INDICATED COUNTY...

THIS STORM WILL BE CAPABLE OF PRODUCING PENNY SIZE HAIL. RESIDENTS IN
THESE AREAS SHOULD REMAIN ALERT IN CASE THE SIGNIFICANT WEATHER
ADVISORY IS UPGRADED TO A WARNING.

LAT...LON 3697 9542 3694 9542 3694 9543 3675 9543
      3676 9574 3686 9571
TIME...MOT...LOC 0339Z 267DEG 21KT 3685 9563

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 19, 10:50 PM CDT	Special Weather Statement	TSA	Nowata	55 min
Apr 19, 11:09 PM CDT	Special Weather Statement	TSA	Rogers	36 min
Apr 19, 11:36 PM CDT	Special Weather Statement	TSA	Pittsburg	39 min
Apr 20, 12:32 AM CDT	Special Weather Statement	TSA	Pittsburg	28 min
Apr 20, 12:57 AM CDT	Special Weather Statement	TSA	Latimer	33 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.