Alert archive / Arkansas / Special Weather Statements in 2016

Special Weather Statement, NWS Tulsa, OK

August 12, 2016Sebastian County, Arkansas

NWS Tulsa, OK issued this special weather statement at Aug 12, 2016, 3:09 PM CDT for Sebastian County, Arkansas. 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 outline as issued.

The facts

Issued
Aug 12, 2016, 3:09 PM CDT (20:09 UTC)
Expired
Aug 12, 2016, 3:45 PM CDT
In force
36 min
Issued by
NWS Tulsa, OK

County Sebastian County, AR

The radar

The Western Arkansas radar (KSRX), 14 km from the middle of the area, began a volume at 20:10 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

Springfield, MO (KSGF), launched 12:00Z, 8.2 hours before the alert went out and 183 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, Springfield, MO at 12:00Z on 2016-08-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1606 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, Springfield, MO at 12:00Z on 2016-08-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 109 square meters per square second.1939Sfc1 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
1606 J/kg
Mixed-layer CIN
-57 J/kg
Mixed-layer LCL
1123 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
109 m²/s²
0-3 km storm-relative helicity
128 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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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 Aug 12, 3:05 PM CDT, 4 minutes earlier.

Area forecast discussion, Aug 12, 3:05 PM CDT, 4 minutes before
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Hazardous weather outlook, Aug 12, 1:44 PM CDT, 1 hour 25 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
144 PM CDT FRI AUG 12 2016

ARZ001-002-010-011-019-020-029-OKZ049-053>076-131030-
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-
144 PM CDT FRI AUG 12 2016

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

.DAY ONE...THIS AFTERNOON AND TONIGHT.

SEVERE THUNDERSTORM.
	RISK...LIMITED.
	AREA...SOUTHEAST OKLAHOMA AND NORTHWEST ARKANSAS.
	ONSET...ONGOING.

HEAVY RAIN AND FLASH FLOOD.
	RISK...LIMITED.
	AREA...SOUTHEAST OKLAHOMA AND NORTHWEST ARKANSAS.
	ONSET...ONGOING.

DANGEROUS HEAT.
	RISK...SIGNIFICANT.
	AREA...SOUTHEAST OKLAHOMA AND WEST CENTRAL ARKANSAS.
	ONSET...ONGOING.

DISCUSSION...
SCATTERED SHOWERS AND THUNDERSTORMS WILL CONTINUE TO MOVE ACROSS
EASTERN OKLAHOMA AND NORTHWEST ARKANSAS AS A COLD FRONT PUSHES
SLOWLY SOUTHWARD OVER THE REGION. THE GREATER CHANCES FOR
THUNDERSTORMS WILL BE MAINLY ALONG AND AHEAD OF THE FRONT OVER
SOUTHEAST OKLAHOMA AND NORTHWEST ARKANSAS. HOT AND HUMID
CONDITIONS AHEAD OF THE FRONT COMBINED WITH INCREASING INSTABILITY
WILL ALLOW FOR A LIMITED SEVERE POTENTIAL...WITH LOCALLY DAMAGING
WINDS BEING THE MAIN THREAT. ALSO...SOME PERIODS OF HEAVY
RAINFALL WITHIN THE STRONGER STORMS COULD CREATE LOCALIZED AREAS
OF POTENTIAL FLASH FLOODING CONDITIONS.

HEAT INDEX VALUES IN THE 100 TO NEAR 110 DEGREE RANGE WILL REMAIN
COMMON THROUGH THE AFTERNOON HOURS OVER LOCATIONS ALONG AND AHEAD
OF THE FRONT THAT DO NOT RECEIVE RAINFALL...ESPECIALLY OVER
SOUTHEAST OKLAHOMA INTO WEST CENTRAL ARKANSAS.

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

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.
SATURDAY...THUNDERSTORM POTENTIAL.
SUNDAY AND MONDAY...THUNDERSTORM POTENTIAL...HEAVY RAIN POTENTIAL.
TUESDAY...THUNDERSTORM POTENTIAL.
WEDNESDAY AND THURSDAY...NO HAZARDS.

EXTENDED DISCUSSION...
THUNDERSTORM CHANCES WILL REMAIN POSSIBLE ACROSS PARTS OF EASTERN
OKLAHOMA AND NORTHWEST ARKANSAS THROUGH THE WEEKEND AS THE
FRONTAL BOUNDARY IS FORECAST TO STALL JUST SOUTHEAST OF THE
REGION. A LOW PRESSURE SYSTEM ALSO LOOKS TO LIFT NORTHWARD TOWARD
THE REGION FOR THE START OF NEXT WEEK WHICH WILL ALLOW FOR
THUNDERSTORM CHANCES TO CONTINUE INTO TUESDAY OVER EASTERN
OKLAHOMA AND NORTHWEST ARKANSAS. PERIODS OF HEAVY RAINFALL COULD
BE POSSIBLE WITH THIS SYSTEM SUNDAY AND MONDAY.

WWW.WEATHER.GOV/TULSA CONTAINS ADDITIONAL INFORMATION.

In the hours before

Special weather statement, Aug 12, 2:35 PM CDT, 34 minutes before
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Special weather statement, Aug 12, 2:42 PM CDT, 27 minutes before
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Special weather statement, Aug 12, 2:44 PM CDT, 25 minutes before
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Special weather statement, Aug 12, 2:48 PM CDT, 21 minutes before
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Special weather statement, Aug 12, 3:06 PM CDT, 3 minutes before
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Special weather statement, Aug 12, 3:09 PM CDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 12, 1:07 PM CDTSpecial Weather StatementTSAPittsburg38 min
Aug 12, 1:35 PM CDTSpecial Weather StatementTSALatimer40 min
Aug 12, 1:47 PM CDTSpecial Weather StatementTSAPushmataha43 min
Aug 12, 1:49 PM CDTSevere Thunderstorm WarningTSALatimer20 min
Aug 12, 2:35 PM CDTSpecial Weather StatementTSAChoctaw25 min
Aug 12, 2:44 PM CDTSpecial Weather StatementTSASequoyah31 min
Aug 12, 3:06 PM CDTSpecial Weather StatementTSAChoctaw24 min
Aug 12, 2:42 PM CDTSpecial Weather StatementTSASebastian33 min
Aug 12, 2:48 PM CDTSpecial Weather StatementTSACrawford27 min

Nearby

Special Weather Statements in Arkansas, 2016Every special weather statement in 2016

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.