Alert archive / Arkansas / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 4, NWS Little Rock, AR

January 21, 20177 counties in Arkansas

NWS Little Rock, AR issued this severe thunderstorm warning at Jan 21, 2017, 8:05 PM CST for 7 counties in Arkansas. It was in force for 40 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: Jan 21, 2017, 8:05 PM CST (02:05 UTC)
Expired: Jan 21, 2017, 8:45 PM CST
In force: 40 min
Issued by: NWS Little Rock, AR
Area: Storm-based polygon
Hail: 0.88 in
Wind: 70.0 mph

Counties Bradley County, AR, Calhoun County, AR, Cleveland County, AR, Dallas County, AR, Drew County, AR, Grant County, AR, Lincoln County, AR

The radar

The Little Rock radar (KLZK), 113 km from the middle of the area, began a volume at 02:07 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
Jan 21, 3:41 PM CST	Tornado Watch	SPC	7 hr
Jan 21, 7:50 PM CST	Tornado Watch	SPC	4 hr

The nearest sounding before it

Shreveport, LA (KBAD), launched 00:00Z, 2.1 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: 1144 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 813 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 200 m²/s²
0-3 km storm-relative helicity: 285 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 9.0

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 Jan 21, 5:55 PM CST, 2 hours 10 minutes earlier.

Area forecast discussion, Jan 21, 5:55 PM CST, 2 hours 10 minutes before

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Hazardous weather outlook, Jan 21, 6:15 PM CST, 1 hour 50 minutes before

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In the hours before

Local storm report, Jan 21, 5:37 PM CST, 2 hours 28 minutes before

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Special weather statement, Jan 21, 6:16 PM CST, 1 hour 49 minutes before

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Local storm report, Jan 21, 6:42 PM CST, 1 hour 23 minutes before

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Special weather statement, Jan 21, 6:48 PM CST, 1 hour 17 minutes before

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Special weather statement, Jan 21, 7:15 PM CST, 50 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
Jan 21, 6:16 PM CST	Special Weather Statement	LZK	Saline	29 min
Jan 21, 6:48 PM CST	Special Weather Statement	LZK	Pike	42 min
Jan 21, 7:15 PM CST	Special Weather Statement	LZK	Polk	45 min
Jan 21, 7:16 PM CST	Severe Thunderstorm Warning	LZK	Polk	44 min
Jan 21, 7:25 PM CST	Severe Thunderstorm Warning	LZK	Bradley, Calhoun, Cleveland, Drew, Ouachita	50 min
Jan 21, 8:08 PM CST	Special Weather Statement	LZK	Garland	37 min
Jan 21, 8:34 PM CST	Severe Thunderstorm Warning	LZK	Desha, Drew, Lincoln	41 min
Jan 21, 8:43 PM CST	Special Weather Statement	LZK	Cleveland, Jefferson, Lincoln	47 min
Jan 21, 9:15 PM CST	Special Weather Statement	LZK	Arkansas, Desha, Lincoln	45 min
Jan 21, 9:55 PM CST	Special Weather Statement	LZK	Arkansas	35 min
Jan 22, 3:22 AM CST	Lake Wind Advisory	LZK	Baxter, Bradley, Calhoun, Clark, Cleburne, Cleveland and 20 more	24 hr
Jan 22, 3:22 AM CST	Wind Advisory	LZK	Arkansas, Desha, Jefferson, Lincoln, Lonoke, Monroe and 2 more	24 hr
Jan 22, 6:20 AM CST	Special Weather Statement	LZK	Johnson	25 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2017 Every severe thunderstorm warning in 2017

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.