Alert archive / Arkansas / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 293, NWS Little Rock, AR

August 11, 2004Ouachita County, Arkansas

NWS Little Rock, AR issued this severe thunderstorm warning at Aug 11, 2004, 12:47 PM CDT for Ouachita County, Arkansas. It was in force for 43 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 11, 2004, 12:47 PM CDT (17:47 UTC)
Expired
Aug 11, 2004, 1:30 PM CDT
In force
43 min
Issued by
NWS Little Rock, AR
Area
Counties, with a storm outline in the text

County Ouachita County, AR

The radar

The Little Rock radar (KLZK), 150 km from the middle of the area, began a volume at 17:48 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

Shreveport, LA (KSHV), launched 12:00Z, 5.8 hours before the alert went out and 148 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, Shreveport, LA at 12:00Z on 2004-08-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 189 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, Shreveport, LA at 12:00Z on 2004-08-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -18 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
189 J/kg
Mixed-layer CIN
-112 J/kg
Mixed-layer LCL
1474 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
-18 m²/s²
0-3 km storm-relative helicity
-49 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

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 Little Rock, AR wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 11, 12:25 PM CDT, 22 minutes earlier.

Area forecast discussion, Aug 11, 12:25 PM CDT, 22 minutes before
AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE LITTLE ROCK AR
1225 PM CDT WED AUG 11 2004

.DISCUSSION...
PRECIPITATION SHIELD BEGINNING TO BREAK UP A BIT IN THE NORTHERN
HALF OF ARKANSAS LATE THIS MORNING. MEANWHILE...SCATTERED
THUNDERSTORMS INTENSIFYING IN SOUTHWEST SECTIONS OF THE STATE...AND
WILL AFFECT AREAS MAINLY SOUTH OF LITTLE ROCK THIS AFTERNOON.

UPDATED FORECAST TO ACCOUNT FOR LATEST PRECIPITATION TRENDS. ALSO
LOWERED TEMPERATURES IN PARTS OF CENTRAL ARKANSAS GIVEN LOTS OF
CLOUDS/ENOUGH RAIN TO HOLD READINGS DOWN.

COLD FRONT IN CENTRAL ARKANSAS WILL PUSH SOUTHWARD.
MOISTURE/PRECIPITATION WILL BE SHUNTED TOWARD GULF COAST
TONIGHT...WITH CANADIAN HIGH PRESSURE/BELOW NORMAL TEMPERATURES
BEHIND FRONT.

LOOKING AT LATEST DATA...TEMPERATURES THE NEXT COUPLE OF DAYS A
LITTLE WARM IN GOING FORECAST. WILL TREND READINGS DOWN A BIT AS A
RESULT. (46)
&&

.LZK WATCHES/WARNINGS/ADVISORIES...NONE.
&&

46
Hazardous weather outlook, Aug 11, 7:45 AM CDT, 5 hours 2 minutes before
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The office that day

Everything else NWS Little Rock, AR issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 10, 7:58 PM CDTSevere Thunderstorm WarningLZKWhite57 min
Aug 10, 8:10 PM CDTSevere Thunderstorm WarningLZKStone45 min
Aug 10, 9:48 PM CDTSevere Thunderstorm WarningLZKCleburne, White42 min
Aug 10, 11:29 PM CDTSevere Thunderstorm WarningLZKIzard61 min
Aug 11, 12:17 AM CDTSevere Thunderstorm WarningLZKStone58 min
Aug 11, 1:09 AM CDTSevere Thunderstorm WarningLZKBaxter, Marion, Searcy46 min
Aug 11, 2:05 AM CDTSevere Thunderstorm WarningLZKStone60 min
Aug 11, 4:33 AM CDTSevere Thunderstorm WarningLZKVan Buren62 min
Aug 11, 5:36 AM CDTSevere Thunderstorm WarningLZKVan Buren39 min
Aug 11, 3:06 PM CDTSevere Thunderstorm WarningLZKBradley29 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2004Every severe thunderstorm warning in 2004

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.