Alert archive / Arkansas / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 820, NWS Little Rock, AR

August 12, 2011Boone County, Marion County, Arkansas

NWS Little Rock, AR issued this severe thunderstorm warning at Aug 12, 2011, 5:33 PM CDT for Boone County, Marion County, Arkansas. It was in force for 27 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 12, 2011, 5:33 PM CDT (22:33 UTC)
Expired: Aug 12, 2011, 6:00 PM CDT
In force: 27 min
Issued by: NWS Little Rock, AR
Area: Storm-based polygon

Counties Boone County, AR, Marion County, AR

The radar

The Springfield radar (KSGF), 115 km from the middle of the area, began a volume at 22:34 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

Springfield, MO (KSGF), launched 12:00Z, 10.6 hours before the alert went out and 106 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: 196 J/kg
Mixed-layer CIN: -283 J/kg
Mixed-layer LCL: 1165 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 146 m²/s²
0-3 km storm-relative helicity: 141 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 12, 2:42 PM CDT, 2 hours 51 minutes earlier.

Area forecast discussion, Aug 12, 2:42 PM CDT, 2 hours 51 minutes before

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Hazardous weather outlook, Aug 12, 5:00 AM CDT, 12 hours 33 minutes before

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In the hours before

Special weather statement, Aug 12, 5:27 PM CDT, 6 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
Aug 12, 5:37 PM CDT	Special Weather Statement	LZK	Fulton	28 min
Aug 12, 5:46 PM CDT	Special Weather Statement	LZK	Marion	29 min
Aug 12, 6:14 PM CDT	Special Weather Statement	LZK	Baxter, Searcy	31 min
Aug 12, 6:47 PM CDT	Special Weather Statement	LZK	Izard, Searcy, Stone	28 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.