Alert archive / Arkansas / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 478, NWS Little Rock, AR

May 23, 20116 counties in Arkansas

NWS Little Rock, AR issued this severe thunderstorm warning at May 23, 2011, 9:57 PM CDT for 6 counties in Arkansas. It was in force for 63 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: May 23, 2011, 9:57 PM CDT (02:57 UTC)
Expired: May 23, 2011, 11:00 PM CDT
In force: 63 min
Issued by: NWS Little Rock, AR
Area: Storm-based polygon

Counties Johnson County, AR, Logan County, AR, Montgomery County, AR, Pope County, AR, Scott County, AR, Yell County, AR

The radar

The Western Arkansas radar (KSRX), 76 km from the middle of the area, began a volume at 03:01 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
May 23, 9:42 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 3.0 hours before the alert went out and 201 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: 23 J/kg
Mixed-layer CIN: -417 J/kg
Mixed-layer LCL: 1542 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: -138 m²/s²
0-3 km storm-relative helicity: -19 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 May 23, 9:08 PM CDT, 49 minutes earlier.

Area forecast discussion, May 23, 9:08 PM CDT, 49 minutes before

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Hazardous weather outlook, May 23, 9:50 PM CDT, 7 minutes before

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In the hours before

Special weather statement, May 23, 4:23 PM CDT, 5 hours 34 minutes before

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Special weather statement, May 23, 4:28 PM CDT, 5 hours 29 minutes before

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Special weather statement, May 23, 5:14 PM CDT, 4 hours 43 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
May 23, 10:08 PM CDT	River Flood Advisory	LZK	White	36 hr
May 23, 10:52 PM CDT	Severe Thunderstorm Warning	LZK	Conway, Garland, Johnson, Logan, Perry, Pope and 3 more	38 min
May 23, 11:05 PM CDT	Severe Thunderstorm Warning	LZK	Polk, Scott	40 min
May 23, 11:31 PM CDT	Special Weather Statement	LZK	Conway, Faulkner, Perry, Pope, Saline, Van Buren	44 min
May 23, 11:34 PM CDT	Flash Flood Warning	LZK	Garland, Montgomery, Polk, Scott, Yell	3 hr
May 23, 11:45 PM CDT	Severe Thunderstorm Warning	LZK	Garland, Hot Spring, Montgomery, Perry, Saline	45 min
May 23, 11:48 PM CDT	Severe Thunderstorm Warning	LZK	Cleburne, Conway, Faulkner, Lonoke, Perry, Pope and 4 more	42 min
May 24, 12:28 AM CDT	Severe Thunderstorm Warning	LZK	Clark, Dallas, Garland, Grant, Hot Spring, Lonoke and 3 more	47 min
May 24, 2:46 AM CDT	Special Weather Statement	LZK	Jefferson	44 min
May 24, 8:28 AM CDT	Flash Flood Warning	LZK	Hot Spring	71 min
May 24, 8:37 AM CDT	River Flood Advisory	LZK	Franklin, Johnson, Logan	36 hr
May 24, 8:37 AM CDT	River Flood Advisory	LZK	Conway, Perry	36 hr
May 24, 8:39 AM CDT	River Flood Warning	LZK	Yell	36 hr
May 24, 11:51 AM CDT	Flash Flood Warning	LZK	Baxter, Marion	6 hr
May 24, 4:21 PM CDT	River Flood Warning	LZK	Perry	47 hr

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.