Alert archive / Arkansas / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 809, NWS Little Rock, AR

August 8, 20114 counties in Arkansas

NWS Little Rock, AR issued this severe thunderstorm warning at Aug 8, 2011, 10:07 PM CDT for 4 counties in Arkansas. It was in force for 22 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 8, 2011, 10:07 PM CDT (03:07 UTC)
Expired: Aug 8, 2011, 10:29 PM CDT
In force: 22 min
Issued by: NWS Little Rock, AR
Area: Storm-based polygon

Counties Arkansas County, AR, Jefferson County, AR, Lonoke County, AR, Prairie County, AR

The radar

The Little Rock radar (KLZK), 62 km from the middle of the area, began a volume at 03:07 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
Aug 8, 8:39 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Little Rock, AR (KLZK), launched 00:00Z, 3.1 hours before the alert went out and 162 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: 4035 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 1436 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 132 m²/s²
0-3 km storm-relative helicity: 156 m²/s²
Significant tornado parameter: 1.7
Supercell composite: 12.0

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 8, 6:38 PM CDT, 3 hours 29 minutes earlier.

Area forecast discussion, Aug 8, 6:38 PM CDT, 3 hours 29 minutes before

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Hazardous weather outlook, Aug 8, 9:58 PM CDT, 9 minutes before

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In the hours before

Local storm report, Aug 8, 8:52 PM CDT, 1 hour 15 minutes before

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Local storm report, Aug 8, 8:53 PM CDT, 1 hour 14 minutes before

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Local storm report, Aug 8, 8:55 PM CDT, 1 hour 12 minutes before

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Local storm report, Aug 8, 8:58 PM CDT, 1 hour 9 minutes before

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      <p id="message2">
        Please try again in a few minutes.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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Local storm report, Aug 8, 9:06 PM CDT, 1 hour 1 minute before

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      <p id="message2">
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      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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Local storm report, Aug 8, 9:18 PM CDT, 49 minutes before

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      <p id="message1">
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      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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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 8, 7:00 PM CDT	Severe Thunderstorm Warning	LZK	Lonoke, Pulaski	30 min
Aug 8, 7:45 PM CDT	Severe Thunderstorm Warning	LZK	Lonoke, Monroe, Prairie	45 min
Aug 8, 7:59 PM CDT	Severe Thunderstorm Warning	LZK	Arkansas, Jefferson, Lonoke, Prairie	46 min
Aug 8, 8:03 PM CDT	Severe Thunderstorm Warning	LZK	Monroe	27 min
Aug 8, 8:28 PM CDT	Severe Thunderstorm Warning	LZK	Monroe	32 min
Aug 8, 8:45 PM CDT	Severe Thunderstorm Warning	LZK	Arkansas, Jefferson, Lonoke, Prairie	30 min
Aug 8, 9:32 PM CDT	Severe Thunderstorm Warning	LZK	Lonoke, Prairie	29 min
Aug 8, 9:56 PM CDT	Severe Thunderstorm Warning	LZK	Jefferson, Lonoke	34 min
Aug 8, 10:42 PM CDT	Severe Thunderstorm Warning	LZK	White	33 min
Aug 8, 11:15 PM CDT	Special Weather Statement	LZK	Prairie	30 min
Aug 9, 12:09 AM CDT	Special Weather Statement	LZK	Lonoke, Prairie	46 min
Aug 9, 12:20 AM CDT	Special Weather Statement	LZK	Arkansas	30 min
Aug 9, 12:56 AM CDT	Special Weather Statement	LZK	Lonoke	44 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2011 Every severe thunderstorm warning in 2011

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.