Alert archive / Arkansas / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 221, NWS Tulsa, OK

August 12, 2012Crawford County, Franklin County, Sebastian County, Arkansas

NWS Tulsa, OK issued this severe thunderstorm warning at Aug 12, 2012, 11:36 PM CDT for Crawford County, Franklin County, Sebastian County, Arkansas. It was in force for 54 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, 2012, 11:36 PM CDT (04:36 UTC)
Expired
Aug 13, 2012, 12:30 AM CDT
In force
54 min
Issued by
NWS Tulsa, OK
Area
Storm-based polygon

Counties Crawford County, AR, Franklin County, AR, Sebastian County, AR

The radar

The Western Arkansas radar (KSRX), 35 km from the middle of the area, began a volume at 04:38 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 12, 10:49 PM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 4.6 hours before the alert went out and 152 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 00:00Z on 2012-08-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 338 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Springfield, MO at 00:00Z on 2012-08-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 121 square meters per square second.19395878Sfc1 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
338 J/kg
Mixed-layer CIN
-106 J/kg
Mixed-layer LCL
1933 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
121 m²/s²
0-3 km storm-relative helicity
328 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

434 
WUUS54 KTSA 130436
SVRTSA
ARC033-047-131-130530-
/O.NEW.KTSA.SV.W.0221.120813T0436Z-120813T0530Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
1136 PM CDT SUN AUG 12 2012

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL CRAWFORD COUNTY IN NORTHWEST ARKANSAS
  WESTERN FRANKLIN COUNTY IN WEST CENTRAL ARKANSAS
  NORTHEASTERN SEBASTIAN COUNTY IN WEST CENTRAL ARKANSAS

* UNTIL 1230 AM CDT

* AT 1134 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 4 MILES
  NORTHEAST OF RUDY...MOVING EAST AT 20 MPH.

  STORM HAZARDS INCLUDE...
  QUARTER SIZE HAIL...
  WIND GUSTS TO 60 MPH...

* SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...ALMA...
  CHESTER...MOUNTAINBURG...LAKE FORT SMITH...DYER...MULBERRY AND
  FERN.

THIS INCLUDES INTERSTATE 40 BETWEEN MILE MARKERS 0 AND 32.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PEOPLE OUTSIDE SHOULD MOVE TO A SAFE SHELTER...PREFERABLY INSIDE A
STRONG BUILDING. STAY AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

&&

LAT...LON 3539 9389 3546 9444 3564 9447 3564 9434
      3573 9431 3570 9388
TIME...MOT...LOC 0436Z 276DEG 17KT 3557 9423

$$
2 follow-up statements
050 
WWUS54 KTSA 130449
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
1149 PM CDT SUN AUG 12 2012

ARC131-130459-
/O.CAN.KTSA.SV.W.0221.000000T0000Z-120813T0530Z/
SEBASTIAN AR-
1149 PM CDT SUN AUG 12 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN SEBASTIAN COUNTY
IS CANCELLED...

LAT...LON 3555 9427 3567 9426 3570 9388 3539 9389
TIME...MOT...LOC 0449Z 278DEG 18KT 3558 9412

$$

ARC033-047-130530-
/O.CON.KTSA.SV.W.0221.000000T0000Z-120813T0530Z/
CRAWFORD AR-FRANKLIN AR-
1149 PM CDT SUN AUG 12 2012

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT
FOR WESTERN FRANKLIN AND CENTRAL CRAWFORD COUNTIES...

AT 1146 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR
MOUNTAINBURG...MOVING EAST AT 20 MPH.

STORM HAZARDS INCLUDE...
QUARTER SIZE HAIL...
WIND GUSTS TO 60 MPH...

SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...LOCKE...
PINEY...PLEASANT HILL...MULBERRY...FERN...TONEY...LONELM...CECIL...
CRAVENS AND JETHRO.

THIS INCLUDES INTERSTATE 40 BETWEEN MILE MARKERS 17 AND 32.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PEOPLE OUTSIDE SHOULD MOVE TO A SAFE SHELTER...PREFERABLY INSIDE A
STRONG BUILDING. STAY AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

&&

LAT...LON 3555 9427 3567 9426 3570 9388 3539 9389
TIME...MOT...LOC 0449Z 278DEG 18KT 3558 9412

$$
082 
WWUS54 KTSA 130527
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
1227 AM CDT MON AUG 13 2012

ARC033-047-130537-
/O.EXP.KTSA.SV.W.0221.000000T0000Z-120813T0530Z/
CRAWFORD AR-FRANKLIN AR-
1227 AM CDT MON AUG 13 2012

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN FRANKLIN AND CENTRAL
CRAWFORD COUNTIES EXPIRES AT 1230 AM CDT...

THE THUNDERSTORM HAS MOVED OUT OF THE WARNED AREA AND WEAKENED BELOW
SEVERE LIMITS...THEREFORE THE SEVERE THUNDERSTORM WARNING WILL BE
ALLOWED TO EXPIRE.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 4 AM.

LAT...LON 3555 9427 3567 9426 3570 9388 3539 9389
TIME...MOT...LOC 0527Z 278DEG 18KT 3555 9389

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 12, 10:28 PM CDTSevere Thunderstorm WarningTSACrawford, Washington47 min
Aug 12, 11:07 PM CDTSevere Thunderstorm WarningTSABenton, Washington53 min
Aug 12, 11:11 PM CDTSevere Thunderstorm WarningTSACrawford, Washington37 min
Aug 12, 11:30 PM CDTSevere Thunderstorm WarningTSABenton, Washington25 min
Aug 12, 11:58 PM CDTSpecial Weather StatementTSAWashington32 min
Aug 13, 12:01 AM CDTSpecial Weather StatementTSAFranklin29 min
Aug 13, 12:29 AM CDTSpecial Weather StatementTSABenton46 min
Aug 13, 1:06 AM CDTSpecial Weather StatementTSABenton, Carroll24 min
Aug 13, 2:01 AM CDTSpecial Weather StatementTSABenton29 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2012Every severe thunderstorm warning 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.