Alert archive / Arkansas / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 189, NWS Little Rock, AR

April 23, 2011Polk County, Scott County, Arkansas

NWS Little Rock, AR issued this severe thunderstorm warning at Apr 23, 2011, 1:39 AM CDT for Polk County, Scott County, Arkansas. It was in force for 31 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 23, 2011, 1:39 AM CDT (06:39 UTC)
Expired: Apr 23, 2011, 2:10 AM CDT
In force: 31 min
Issued by: NWS Little Rock, AR
Area: Storm-based polygon

Counties Polk County, AR, Scott County, AR

The radar

The Western Arkansas radar (KSRX), 71 km from the middle of the area, began a volume at 06:39 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 00:00Z, 6.7 hours before the alert went out and 250 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: 2835 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 640 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 231 m²/s²
0-3 km storm-relative helicity: 254 m²/s²
Significant tornado parameter: 4.7
Supercell composite: 18.1

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 Apr 23, 12:51 AM CDT, 48 minutes earlier.

Area forecast discussion, Apr 23, 12:51 AM CDT, 48 minutes before

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Hazardous weather outlook, Apr 22, 7:45 PM CDT, 5 hours 54 minutes before

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In the hours before

Special weather statement, Apr 22, 8:05 PM CDT, 5 hours 34 minutes before

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Local storm report, Apr 22, 8:54 PM CDT, 4 hours 45 minutes before

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Special weather statement, Apr 22, 11:28 PM CDT, 2 hours 11 minutes before

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Special weather statement, Apr 23, 1:20 AM CDT, 19 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 22, 7:37 PM CDT	Severe Thunderstorm Warning	LZK	Baxter, Boone, Marion	27 min
Apr 22, 8:05 PM CDT	Special Weather Statement	LZK	Newton	30 min
Apr 22, 8:37 PM CDT	Severe Thunderstorm Warning	LZK	Johnson, Newton, Pope, Searcy	23 min
Apr 22, 11:28 PM CDT	Special Weather Statement	LZK	Conway, Faulkner, Yell	42 min
Apr 23, 1:20 AM CDT	Special Weather Statement	LZK	Scott	45 min
Apr 23, 4:51 AM CDT	Flash Flood Watch	LZK	Baxter, Bradley, Calhoun, Desha, Drew, Fulton and 5 more	4 days
Apr 23, 9:08 AM CDT	Special Weather Statement	LZK	Boone, Marion, Newton	62 min
Apr 23, 9:14 AM CDT	River Flood Warning	LZK	Randolph	6 days
Apr 23, 9:14 AM CDT	River Flood Warning	LZK	Randolph	39 days
Apr 23, 9:14 AM CDT	River Flood Warning	LZK	Independence, Jackson, Lawrence	45 days
Apr 23, 9:25 AM CDT	Special Weather Statement	LZK	Johnson	45 min
Apr 23, 9:56 AM CDT	River Flood Warning	LZK	White, Woodruff	69 days
Apr 23, 10:16 AM CDT	Special Weather Statement	LZK	Baxter, Marion	44 min
Apr 23, 11:07 AM CDT	Special Weather Statement	LZK	Fulton, Sharp	43 min
Apr 23, 11:13 AM CDT	Special Weather Statement	LZK	Boone	47 min
Apr 23, 2:43 PM CDT	Special Weather Statement	LZK	Boone	47 min
Apr 23, 3:04 PM CDT	Severe Thunderstorm Warning	LZK	Boone, Marion	26 min
Apr 23, 3:30 PM CDT	Special Weather Statement	LZK	Marion	15 min
Apr 23, 3:33 PM CDT	Severe Thunderstorm Warning	LZK	Marion	14 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.