Alert archive / Arkansas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 101, NWS Little Rock, AR

April 30, 20094 counties in Arkansas

NWS Little Rock, AR issued this severe thunderstorm warning at Apr 30, 2009, 6:55 PM CDT for 4 counties in Arkansas. It was in force for 50 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: Apr 30, 2009, 6:55 PM CDT (23:55 UTC)
Expired: Apr 30, 2009, 7:45 PM CDT
In force: 50 min
Issued by: NWS Little Rock, AR
Area: Storm-based polygon

Counties Faulkner County, AR, Lonoke County, AR, Pulaski County, AR, White County, AR

The radar

The Little Rock radar (KLZK), 24 km from the middle of the area, began a volume at 23:55 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.

Issued	Product	Office	Lasted
Apr 30, 5:10 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 11.9 hours before the alert went out and 194 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: 14 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 507 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 60 m²/s²
0-3 km storm-relative helicity: -57 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 Apr 30, 6:50 PM CDT, 5 minutes earlier.

Area forecast discussion, Apr 30, 6:50 PM CDT, 5 minutes before

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Hazardous weather outlook, Apr 30, 5:30 PM CDT, 1 hour 25 minutes before

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In the hours before

Special weather statement, Apr 30, 3:52 PM CDT, 3 hours 3 minutes before

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Local storm report, Apr 30, 4:42 PM CDT, 2 hours 13 minutes before

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Special weather statement, Apr 30, 4:48 PM CDT, 2 hours 7 minutes before

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Local storm report, Apr 30, 5:37 PM CDT, 1 hour 18 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 29, 7:47 PM CDT	Flash Flood Warning	LZK	Clark, Logan, Montgomery, Pike, Polk, Scott and 1 more	3 hr
Apr 30, 3:59 PM CDT	Severe Thunderstorm Warning	LZK	Independence, Jackson	46 min
Apr 30, 4:17 PM CDT	Tornado Warning	LZK	Independence, Jackson	28 min
Apr 30, 4:50 PM CDT	Severe Thunderstorm Warning	LZK	Cleburne, Jackson, White	25 min
Apr 30, 4:56 PM CDT	Severe Thunderstorm Warning	LZK	Faulkner, Lonoke, Pulaski, White	49 min
Apr 30, 5:22 PM CDT	Severe Thunderstorm Warning	LZK	White, Woodruff	38 min
Apr 30, 5:58 PM CDT	Severe Thunderstorm Warning	LZK	White, Woodruff	47 min
Apr 30, 6:40 PM CDT	Severe Thunderstorm Warning	LZK	Faulkner, Perry, Pulaski	35 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2009 Every severe thunderstorm warning in 2009

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.