Alert archive / Arkansas / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 185, NWS Little Rock, AR

April 21, 2011Logan County, Scott County, Arkansas

NWS Little Rock, AR issued this severe thunderstorm warning at Apr 21, 2011, 5:49 PM CDT for Logan County, Scott County, Arkansas. It was in force for 24 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 21, 2011, 5:49 PM CDT (22:49 UTC)
Expired: Apr 21, 2011, 6:13 PM CDT
In force: 24 min
Issued by: NWS Little Rock, AR
Area: Storm-based polygon

Counties Logan County, AR, Scott County, AR

The radar

The Western Arkansas radar (KSRX), 51 km from the middle of the area, began a volume at 22:52 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 21, 2:35 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 10.8 hours before the alert went out and 207 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1583 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 68 m²/s²
0-3 km storm-relative helicity: 289 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 21, 3:20 PM CDT, 2 hours 29 minutes earlier.

Area forecast discussion, Apr 21, 3:20 PM CDT, 2 hours 29 minutes before

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Hazardous weather outlook, Apr 21, 5:00 PM CDT, 49 minutes before

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In the hours before

Special weather statement, Apr 21, 12:01 PM CDT, 5 hours 48 minutes before

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Special weather statement, Apr 21, 1:02 PM CDT, 4 hours 47 minutes before

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Special weather statement, Apr 21, 1:44 PM CDT, 4 hours 5 minutes before

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Special weather statement, Apr 21, 1:45 PM CDT, 4 hours 4 minutes before

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Local storm report, Apr 21, 4:40 PM CDT, 1 hour 9 minutes before

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Special weather statement, Apr 21, 5:13 PM CDT, 36 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 20, 7:09 PM CDT	Special Weather Statement	LZK	Arkansas, Lincoln	46 min
Apr 20, 7:26 PM CDT	Special Weather Statement	LZK	Perry	44 min
Apr 20, 7:35 PM CDT	Flash Flood Warning	LZK	Arkansas, Clark, Cleveland, Dallas, Desha, Garland and 7 more	3 hr
Apr 20, 7:51 PM CDT	Special Weather Statement	LZK	Cleveland, Grant, Jefferson	44 min
Apr 20, 8:02 PM CDT	Severe Thunderstorm Warning	LZK	Conway, Faulkner, Perry, Pope, Yell	25 min
Apr 20, 8:30 PM CDT	Special Weather Statement	LZK	Clark	45 min
Apr 20, 8:55 PM CDT	Special Weather Statement	LZK	Calhoun, Cleveland, Lincoln	45 min
Apr 20, 9:15 PM CDT	Special Weather Statement	LZK	Lincoln	45 min
Apr 20, 9:20 PM CDT	Special Weather Statement	LZK	Clark	45 min
Apr 20, 10:28 PM CDT	Special Weather Statement	LZK	Calhoun	47 min
Apr 20, 10:34 PM CDT	Severe Thunderstorm Warning	LZK	Bradley, Calhoun, Cleveland	26 min
Apr 20, 10:45 PM CDT	Severe Thunderstorm Warning	LZK	Clark, Pike	30 min
Apr 20, 10:58 PM CDT	Severe Thunderstorm Warning	LZK	Bradley, Calhoun, Cleveland, Drew, Lincoln	32 min
Apr 21, 12:15 AM CDT	Severe Thunderstorm Warning	LZK	Bradley, Calhoun, Cleveland, Dallas	30 min
Apr 21, 12:28 AM CDT	Severe Thunderstorm Warning	LZK	Bradley, Calhoun	35 min
Apr 21, 1:21 AM CDT	Flash Flood Warning	LZK	Clark, Dallas, Ouachita	3 hr
Apr 21, 2:16 AM CDT	Flash Flood Warning	LZK	Bradley, Calhoun, Cleveland, Dallas, Ouachita	2 hr
Apr 21, 4:47 AM CDT	Flash Flood Warning	LZK	Bradley, Calhoun, Clark, Cleveland, Dallas, Ouachita	2 hr
Apr 21, 9:09 AM CDT	River Flood Advisory	LZK	Clark, Hot Spring	36 hr
Apr 21, 9:09 AM CDT	River Flood Advisory	LZK	Calhoun, Ouachita	36 hr
Apr 21, 10:15 AM CDT	River Flood Advisory	LZK	White, Woodruff	36 hr
Apr 21, 10:52 AM CDT	Special Weather Statement	LZK	Polk	48 min
Apr 21, 11:35 AM CDT	Special Weather Statement	LZK	Polk	30 min
Apr 21, 11:58 AM CDT	Special Weather Statement	LZK	Pike	62 min
Apr 21, 12:01 PM CDT	Special Weather Statement	LZK	Montgomery	59 min
Apr 21, 1:02 PM CDT	Special Weather Statement	LZK	Montgomery, Pike, Scott	43 min
Apr 21, 1:44 PM CDT	Special Weather Statement	LZK	Dallas	61 min
Apr 21, 1:45 PM CDT	Special Weather Statement	LZK	Montgomery, Scott	45 min
Apr 21, 5:13 PM CDT	Special Weather Statement	LZK	Hot Spring	47 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.