Alert archive / Arkansas / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 723, NWS Little Rock, AR

July 30, 20114 counties in Arkansas

NWS Little Rock, AR issued this severe thunderstorm warning at Jul 30, 2011, 5:34 PM CDT for 4 counties in Arkansas. It was in force for 20 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: Jul 30, 2011, 5:34 PM CDT (22:34 UTC)
Expired: Jul 30, 2011, 5:54 PM CDT
In force: 20 min
Issued by: NWS Little Rock, AR
Area: Storm-based polygon

Counties Baxter County, AR, Fulton County, AR, Izard County, AR, Stone County, AR

The radar

The Little Rock radar (KLZK), 148 km from the middle of the area, began a volume at 22:35 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 176 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: 2029 J/kg
Mixed-layer CIN: -70 J/kg
Mixed-layer LCL: 1301 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 17 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 Jul 30, 2:58 PM CDT, 2 hours 36 minutes earlier.

Area forecast discussion, Jul 30, 2:58 PM CDT, 2 hours 36 minutes before

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Hazardous weather outlook, Jul 30, 1:20 PM CDT, 4 hours 14 minutes before

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In the hours before

Local storm report, Jul 30, 2:02 PM CDT, 3 hours 32 minutes before

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Special weather statement, Jul 30, 3:07 PM CDT, 2 hours 27 minutes before

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Local storm report, Jul 30, 3:38 PM CDT, 1 hour 56 minutes before

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Special weather statement, Jul 30, 3:43 PM CDT, 1 hour 51 minutes before

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Special weather statement, Jul 30, 4:48 PM CDT, 46 minutes before

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Special weather statement, Jul 30, 5:30 PM CDT, 4 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
Jul 30, 1:14 PM CDT	Special Weather Statement	LZK	Lonoke	31 min
Jul 30, 1:42 PM CDT	Special Weather Statement	LZK	Lonoke	28 min
Jul 30, 2:56 PM CDT	Heat Advisory	LZK	Arkansas, Baxter, Bradley, Calhoun, Clark, Cleburne and 28 more	69 hr
Jul 30, 3:07 PM CDT	Special Weather Statement	LZK	White	28 min
Jul 30, 3:09 PM CDT	Severe Thunderstorm Warning	LZK	White	36 min
Jul 30, 3:43 PM CDT	Special Weather Statement	LZK	Boone	42 min
Jul 30, 4:48 PM CDT	Special Weather Statement	LZK	Newton	47 min
Jul 30, 5:00 PM CDT	Severe Thunderstorm Warning	LZK	Baxter, Fulton	28 min
Jul 30, 5:30 PM CDT	Special Weather Statement	LZK	Lonoke	45 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.