Alert archive / Arkansas / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 261, NWS Shreveport, LA

August 8, 2012Howard County, Sevier County, Arkansas

NWS Shreveport, LA issued this severe thunderstorm warning at Aug 8, 2012, 2:15 PM CDT for Howard County, Sevier County, Arkansas. It was in force for 60 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 8, 2012, 2:15 PM CDT (19:15 UTC)
Expired: Aug 8, 2012, 3:15 PM CDT
In force: 60 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Howard County, AR, Sevier County, AR

The radar

The Western Arkansas radar (KSRX), 118 km from the middle of the area, began a volume at 19:16 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Shreveport, LA (KBAD), launched 12:00Z, 7.3 hours before the alert went out and 199 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: 2782 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 818 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: 1 m²/s²
0-3 km storm-relative helicity: 19 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

122 
WUUS54 KSHV 081915
SVRSHV
ARC061-133-082015-
/O.NEW.KSHV.SV.W.0261.120808T1915Z-120808T2015Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
215 PM CDT WED AUG 8 2012

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN HOWARD COUNTY IN SOUTHWEST ARKANSAS...
  THIS INCLUDES THE CITIES OF...UMPIRE...DIERKS...
  NORTH CENTRAL SEVIER COUNTY IN SOUTHWEST ARKANSAS...

* UNTIL 315 PM CDT

* AT 212 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 6 MILES
  EAST OF ATHENS...OR 6 MILES NORTHEAST OF UMPIRE...AND MOVING
  SOUTHEAST AT 5 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MUDDY
  FORK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

&&

LAT...LON 3436 9394 3435 9393 3420 9392 3418 9381
      3409 9382 3409 9426 3420 9427 3420 9425
      3426 9425 3427 9427 3433 9427 3436 9425
TIME...MOT...LOC 1915Z 296DEG 5KT 3432 9396

$$

20

1 follow-up statement

233 
WWUS54 KSHV 082002
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
302 PM CDT WED AUG 8 2012

ARC133-082013-
/O.CAN.KSHV.SV.W.0261.000000T0000Z-120808T2015Z/
SEVIER AR-
302 PM CDT WED AUG 8 2012

...THE SEVERE THUNDERSTORM WARNING FOR SEVIER COUNTY IS CANCELLED...

LAT...LON 3436 9394 3420 9392 3418 9381 3409 9382
      3409 9408 3413 9408 3414 9410 3419 9410
      3420 9425 3426 9425 3430 9427 3436 9425
TIME...MOT...LOC 2003Z 051DEG 3KT 3430 9400

$$

ARC061-082015-
/O.CON.KSHV.SV.W.0261.000000T0000Z-120808T2015Z/
HOWARD AR-
302 PM CDT WED AUG 8 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM CDT
FOR HOWARD COUNTY...

AT 259 PM CDT...A SEVERE THUNDERSTORM WAS REPORTED CAPABLE OF
PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.
 THIS STORM WAS LOCATED NEAR UMPIRE...MOVING SOUTHWEST AT 5 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MUDDY
FORK...DIERKS...BURG AND ATHENS

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

&&

LAT...LON 3436 9394 3420 9392 3418 9381 3409 9382
      3409 9408 3413 9408 3414 9410 3419 9410
      3420 9425 3426 9425 3430 9427 3436 9425
TIME...MOT...LOC 2003Z 051DEG 3KT 3430 9400

$$

20

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Shreveport, LA wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 8, 10:44 AM CDT, 3 hours 31 minutes earlier.

Area forecast discussion, Aug 8, 10:44 AM CDT, 3 hours 31 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
1044 AM CDT WED AUG 8 2012

.DISCUSSION...
CONVECTION CONTINUES ACROSS PORTIONS OF EAST TEXAS THIS MORNING
AHEAD OF A SURFACE BOUNDARY THAT STRETCHES FROM NEAR FORT SMITH
ARKANSAS TO PARIS TEXAS. CLOUD COVER ACROSS NORTHEAST TEXAS
REMAINS FAIRLY DENSE...WHICH WILL RESTRICT TEMPERATURES FROM
CLIMBING TO 100 DEGREES THIS AFTERNOON. THEREFORE...WENT AHEAD AND
INCREASED CLOUD COVER AND LOWERED HIGH TEMPERATURES ACROSS
NORTHEAST TEXAS. OTHERWISE...FORECAST REMAINS ON TRACK. /05/

&&

.AVIATION...
ONGOING CONVECTION ACROSS NORTHEAST TEXAS WILL BRING BRIEF IFR CIGS
AND VSBYS NEXT FEW HOURS. ALSO EXPECT GUSTY SURFACE WIND TO 35 KTS
AND MODERATE TO SEVERE TURBULENCE VICINITY STRONGEST TSTMS. FOR THE
AFTERNOON AND TONIGHT...MOSTLY VFR FLIGHT CONDITIONS EXPECTED ACROSS
THE FOUR STATE REGION. EXCEPTION WILL AGAIN BE CONVECTION...WHICH
SHOULD REMAIN WIDELY SCATTERED. HOWEVER...WITH A VERY UNSTABLE
ATMOSPHERE...TSTMS WILL HAVE A TENDENCY TO BECOME SEVERE...CREATING
HAZARDOUS FLIGHT CONDITIONS. AFTER 09/08Z EXPECT SOME LOCALIZED
MVFR CIGS AND VISIBILITIES IN FOG...WHICH WILL CONTINUE THROUGH
09/14Z.  /14/

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  99  76  95  75  95 /  20  30  30  30  20
MLU  97  74  94  71  93 /  20  30  40  30  20
DEQ  99  74  97  72  94 /  30  30  30  20  10
TXK  97  75  95  75  93 /  30  30  30  20  10
ELD  98  74  95  72  94 /  20  30  30  30  20
TYR  99  75  97  76  95 /  30  20  30  30  20
GGG  97  76  96  75  95 /  30  20  30  30  20
LFK  98  75  96  74  96 /  20  20  30  30  20

&&

.SHV WATCHES/WARNINGS/ADVISORIES...
AR...NONE.
LA...NONE.
OK...NONE.
TX...NONE.
&&

05/12

Hazardous weather outlook, Aug 8, 11:46 AM CDT, 2 hours 29 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
1146 AM CDT WED AUG 8 2012

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-
TXZ096-097-108>112-124>126-136>138-149>153-165>167-091700-
SEVIER-HOWARD-LITTLE RIVER-HEMPSTEAD-NEVADA-MILLER-LAFAYETTE-
COLUMBIA-UNION AR-CADDO-BOSSIER-WEBSTER-CLAIBORNE-LINCOLN-
UNION LA-DE SOTO-RED RIVER-BIENVILLE-JACKSON-OUACHITA-SABINE LA-
NATCHITOCHES-WINN-GRANT-CALDWELL-LA SALLE-MCCURTAIN-BOWIE-
FRANKLIN-TITUS-CAMP-MORRIS-CASS-WOOD-UPSHUR-MARION-SMITH-GREGG-
HARRISON-CHEROKEE-RUSK-PANOLA-NACOGDOCHES-SHELBY-ANGELINA-
SAN AUGUSTINE-SABINE TX-
1146 AM CDT WED AUG 8 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL
ARKANSAS...SOUTHWEST ARKANSAS...NORTH CENTRAL LOUISIANA...
NORTHWEST LOUISIANA...SOUTHEAST OKLAHOMA...EAST TEXAS AND
NORTHEAST TEXAS.

.DAY ONE...THIS AFTERNOON AND TONIGHT...

SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE ACROSS THE FOUR STATE
AREA THIS AFTERNOON AHEAD OF AN OUTFLOW BOUNDARY MOVING ACROSS
ARKANSAS AND NORTH TEXAS. THUNDERSTORM COVERAGE IS EXPECTED TO BE
MOST ACTIVE LATE THIS AFTERNOON INTO THE EARLY EVENING. ALTHOUGH
WIDESPREAD SEVERE WEATHER IS NOT EXPECTED...ISOLATED INSTANCES OF DAMAGING
WIND GUSTS MAY BE POSSIBLE WITH THE STRONGER STORMS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY...

SCATTERED SHOWERS AND THUNDERSTORMS WILL REMAIN POSSIBLE AREAWIDE
THROUGHOUT THE REMAINDER OF THE WORK WEEK. EXPECT ISOLATED
THUNDERSTORMS THROUGH THE WEEKEND MAINLY SOUTH OF INTERSTATE
20. OTHERWISE...AFTERMOON SHOWERS AND THUNDERSTORMS AGAIN POSSIBLE
ACROSS THE REGION EARLY NEXT WEEK.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF EMERGENCY MANAGEMENT PERSONNEL...AMATEUR RADIO
OPERATORS...AND STORM SPOTTERS SHOULD NOT BE NEEDED THROUGH TONIGHT.

In the hours before

Special weather statement, Aug 8, 8:36 AM CDT, 5 hours 39 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
836 AM CDT WED AUG 8 2012

TXZ111-112-081430-
CASS-MORRIS-
836 AM CDT WED AUG 8 2012

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ADVISORY...EFFECTIVE UNTIL 930 AM CDT...FOR THE FOLLOWING
COUNTIES...

IN NORTHEAST TEXAS...
     MORRIS AND CASS...

INCLUDING THE FOLLOWING LOCATIONS...
     DAINGERFIELD...HUGHES SPRINGS...JENKINS...NAPLES...OMAHA...ROCKY
     BRANCH AND US 259 AND I 30 INTERSECTION...

AT 821 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
DETECTING A STRONG THUNDERSTORM NEAR NAPLES...OR 12 MILES NORTH OF
DAINGERFIELD...MOVING SOUTHWEST AT 5 MPH.

DIME SIZE HAIL...AND WINDS 30 TO 40 MPH ARE EXPECTED WITH THIS STORM.
ALSO...EXPECT VERY HEAVY RAINFALL. MINOR FLOODING IS POSSIBLE
IN AREAS OF POOR DRAINAGE.

Special weather statement, Aug 8, 2:07 PM CDT, 8 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
207 PM CDT WED AUG 8 2012

ARZ050-051-082000-
HOWARD-SEVIER-
207 PM CDT WED AUG 8 2012

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ADVISORY...EFFECTIVE UNTIL 300 PM CDT...FOR THE FOLLOWING
COUNTIES...

IN SOUTHWEST ARKANSAS...
     HOWARD AND SEVIER...

INCLUDING THE FOLLOWING LOCATIONS...
     ATHENS...CORINTH...DIERKS AND UMPIRE...

AT 201 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
DETECTING A STRONG THUNDERSTORM NEAR UMPIRE...MOVING SOUTHEAST AT 5
MPH.

MOTHBALL SIZE HAIL...AND WINDS 40 TO 50 MPH ARE EXPECTED WITH THIS
STORM.

20

The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 7, 7:24 PM CDT	Severe Thunderstorm Warning	SHV	Miller	25 min
Aug 8, 4:20 PM CDT	Severe Thunderstorm Warning	SHV	Howard, Little River, Sevier	55 min
Aug 8, 6:08 PM CDT	Severe Thunderstorm Warning	SHV	Columbia	52 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2012 Every 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.