Alert archive / Arkansas / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 261, NWS Little Rock, AR

November 21, 20074 counties in Arkansas

NWS Little Rock, AR issued this severe thunderstorm warning at Nov 21, 2007, 3:22 PM CST for 4 counties in Arkansas. It was in force for 23 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
Nov 21, 2007, 3:22 PM CST (21:22 UTC)
Expired
Nov 21, 2007, 3:45 PM CST
In force
23 min
Issued by
NWS Little Rock, AR
Area
Storm-based polygon

Counties Clark County, AR, Dallas County, AR, Grant County, AR, Hot Spring County, AR

The radar

The Little Rock radar (KLZK), 90 km from the middle of the area, began a volume at 21:24 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
Nov 21, 12:47 PM CSTTornado WatchSPC6 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 9.4 hours before the alert went out and 206 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 2007-11-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 642 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 2007-11-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 143 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
642 J/kg
Mixed-layer CIN
-45 J/kg
Mixed-layer LCL
615 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
143 m²/s²
0-3 km storm-relative helicity
171 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.3

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 21, 3:26 AM CSTLake Wind AdvisoryLZKArkansas, Baxter, Bradley, Calhoun, Clark, Cleburne and 28 more25 hr
Nov 21, 1:53 PM CSTSevere Thunderstorm WarningLZKClark, Montgomery, Pike37 min
Nov 21, 2:28 PM CSTSevere Thunderstorm WarningLZKClark, Hot Spring32 min
Nov 21, 2:35 PM CSTSevere Thunderstorm WarningLZKFaulkner, Pulaski25 min
Nov 21, 2:36 PM CSTSevere Thunderstorm WarningLZKFulton, Sharp24 min
Nov 21, 2:41 PM CSTSevere Thunderstorm WarningLZKClark34 min
Nov 21, 2:56 PM CSTSevere Thunderstorm WarningLZKPulaski34 min
Nov 21, 3:10 PM CSTSevere Thunderstorm WarningLZKWhite50 min
Nov 21, 3:15 PM CSTSevere Thunderstorm WarningLZKGrant, Hot Spring, Saline30 min
Nov 21, 3:26 PM CSTSevere Thunderstorm WarningLZKLonoke, Prairie34 min
Nov 21, 3:59 PM CSTSevere Thunderstorm WarningLZKLonoke, Prairie31 min
Nov 21, 4:09 PM CSTSevere Thunderstorm WarningLZKDallas36 min
Nov 21, 4:56 PM CSTSevere Thunderstorm WarningLZKBradley, Calhoun, Cleveland, Dallas49 min
Nov 21, 5:01 PM CSTSevere Thunderstorm WarningLZKMonroe, Prairie14 min
Nov 21, 5:23 PM CSTSevere Thunderstorm WarningLZKCleveland, Jefferson, Lincoln41 min
Nov 21, 5:29 PM CSTSevere Thunderstorm WarningLZKBradley, Drew31 min
Nov 21, 5:30 PM CSTSevere Thunderstorm WarningLZKMonroe15 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2007Every severe thunderstorm warning in 2007

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.