Alert archive / Arkansas / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 1, NWS Little Rock, AR

January 21, 20174 counties in Arkansas

NWS Little Rock, AR issued this severe thunderstorm warning at Jan 21, 2017, 5:31 PM CST for 4 counties in Arkansas. It was in force for 30 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, 5:31 PM CST (23:31 UTC)
Expired: Jan 21, 2017, 6:01 PM CST
In force: 30 min
Issued by: NWS Little Rock, AR
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Clark County, AR, Garland County, AR, Hot Spring County, AR, Montgomery County, AR

The radar

The Little Rock radar (KLZK), 103 km from the middle of the area, began a volume at 23:33 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

The nearest sounding before it

Shreveport, LA (KBAD), launched 12:00Z, 11.5 hours before the alert went out and 216 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: 20 J/kg
Mixed-layer CIN: -323 J/kg
Mixed-layer LCL: 1223 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 81 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

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 Jan 21, 2:27 PM CST, 3 hours 4 minutes earlier.

Area forecast discussion, Jan 21, 2:27 PM CST, 3 hours 4 minutes before

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Hazardous weather outlook, Jan 21, 10:45 AM CST, 6 hours 46 minutes before

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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.