Alert archive / Arkansas / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 388, NWS Little Rock, AR

August 17, 2012Cleveland County, Jefferson County, Lincoln County, Arkansas

NWS Little Rock, AR issued this severe thunderstorm warning at Aug 17, 2012, 11:37 PM CDT for Cleveland County, Jefferson County, Lincoln County, 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: Aug 17, 2012, 11:37 PM CDT (04:37 UTC)
Expired: Aug 18, 2012, 12:00 AM CDT
In force: 23 min
Issued by: NWS Little Rock, AR
Area: Storm-based polygon

Counties Cleveland County, AR, Jefferson County, AR, Lincoln County, AR

The radar

The Little Rock radar (KLZK), 93 km from the middle of the area, began a volume at 04:37 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

Little Rock, AR (KBYH), launched 00:00Z, 4.6 hours before the alert went out and 203 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: 1405 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 994 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 119 m²/s²
0-3 km storm-relative helicity: 189 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 3.6

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 17, 9:45 PM CDT, 1 hour 52 minutes earlier.

Area forecast discussion, Aug 17, 9:45 PM CDT, 1 hour 52 minutes before

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Hazardous weather outlook, Aug 17, 11:15 PM CDT, 22 minutes before

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In the hours before

Special weather statement, Aug 17, 10:15 PM CDT, 1 hour 22 minutes before

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Special weather statement, Aug 17, 10:24 PM CDT, 1 hour 13 minutes before

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Special weather statement, Aug 17, 10:38 PM CDT, 59 minutes before

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Special weather statement, Aug 17, 11:07 PM CDT, 30 minutes before

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Special weather statement, Aug 17, 11:15 PM CDT, 22 minutes before

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Local storm report, Aug 17, 11:36 PM CDT, 1 minute 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
Aug 17, 7:29 PM CDT	Special Weather Statement	LZK	Calhoun	31 min
Aug 17, 7:33 PM CDT	Special Weather Statement	LZK	Bradley	32 min
Aug 17, 7:46 PM CDT	Severe Thunderstorm Warning	LZK	Bradley	17 min
Aug 17, 8:02 PM CDT	Special Weather Statement	LZK	Ouachita	28 min
Aug 17, 8:34 PM CDT	Special Weather Statement	LZK	Ouachita	31 min
Aug 17, 10:04 PM CDT	Special Weather Statement	LZK	Pulaski	31 min
Aug 17, 10:12 PM CDT	Special Weather Statement	LZK	Cleveland	33 min
Aug 17, 10:15 PM CDT	Special Weather Statement	LZK	Ouachita	30 min
Aug 17, 10:24 PM CDT	Special Weather Statement	LZK	Grant	21 min
Aug 17, 10:38 PM CDT	Special Weather Statement	LZK	Cleveland	32 min
Aug 17, 11:07 PM CDT	Special Weather Statement	LZK	Jefferson	43 min
Aug 17, 11:15 PM CDT	Special Weather Statement	LZK	Hot Spring	30 min
Aug 17, 11:20 PM CDT	Severe Thunderstorm Warning	LZK	Grant, Jefferson	25 min
Aug 17, 11:26 PM CDT	Severe Thunderstorm Warning	LZK	Dallas, Grant, Hot Spring	34 min
Aug 17, 11:53 PM CDT	Special Weather Statement	LZK	Grant	47 min
Aug 17, 11:58 PM CDT	Special Weather Statement	LZK	Cleveland	32 min
Aug 18, 12:26 AM CDT	Special Weather Statement	LZK	Arkansas	29 min
Aug 18, 12:58 AM CDT	Special Weather Statement	LZK	Arkansas	27 min
Aug 18, 4:47 AM CDT	Special Weather Statement	LZK	Polk, Scott	43 min
Aug 18, 5:04 AM CDT	Special Weather Statement	LZK	Montgomery, Pike	46 min
Aug 18, 5:27 AM CDT	Special Weather Statement	LZK	Logan, Polk, Scott, Yell	43 min
Aug 18, 5:41 AM CDT	Special Weather Statement	LZK	Clark, Garland, Hot Spring, Montgomery, Saline	44 min
Aug 18, 6:14 AM CDT	Special Weather Statement	LZK	Montgomery, Polk, Yell	41 min
Aug 18, 6:28 AM CDT	Special Weather Statement	LZK	Clark, Garland, Hot Spring, Saline	42 min
Aug 18, 6:55 AM CDT	Special Weather Statement	LZK	Dallas, Grant	45 min
Aug 18, 8:44 AM CDT	Special Weather Statement	LZK	Ouachita	31 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.