Alert archive / Arkansas / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 307, NWS Little Rock, AR

October 22, 20174 counties in Arkansas

NWS Little Rock, AR issued this severe thunderstorm warning at Oct 22, 2017, 1:48 AM CDT for 4 counties in Arkansas. It was in force for 57 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
Oct 22, 2017, 1:48 AM CDT (06:48 UTC)
Expired
Oct 22, 2017, 2:45 AM CDT
In force
57 min
Issued by
NWS Little Rock, AR
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

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

The radar

The Western Arkansas radar (KSRX), 73 km from the middle of the area, began a volume at 06:49 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.

IssuedProductOfficeLasted
Oct 21, 11:56 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 6.8 hours before the alert went out and 222 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-pSkew-T log-p diagram, Springfield, MO at 00:00Z on 2017-10-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 700 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Springfield, MO at 00:00Z on 2017-10-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 157 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
700 J/kg
Mixed-layer CIN
-128 J/kg
Mixed-layer LCL
1064 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
157 m²/s²
0-3 km storm-relative helicity
169 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.4

Open this sounding in Storm Lab

The office that day

Everything else NWS Little Rock, AR issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 22, 1:01 AM CDTSevere Thunderstorm WarningLZKLogan, Polk, Scott59 min
Oct 22, 1:13 AM CDTSpecial Weather StatementLZKBoone, Marion62 min
Oct 22, 1:18 AM CDTSpecial Weather StatementLZKPolk57 min
Oct 22, 1:34 AM CDTSevere Thunderstorm WarningLZKJohnson, Logan56 min
Oct 22, 2:00 AM CDTSpecial Weather StatementLZKNewton60 min
Oct 22, 2:15 AM CDTSevere Thunderstorm WarningLZKConway, Garland, Johnson, Logan, Perry, Pope and 1 more46 min
Oct 22, 2:17 AM CDTSpecial Weather StatementLZKMontgomery43 min
Oct 22, 2:48 AM CDTSevere Thunderstorm WarningLZKConway, Faulkner, Garland, Perry, Pope, Pulaski and 2 more57 min
Oct 22, 2:52 AM CDTSpecial Weather StatementLZKMontgomery, Pike38 min
Oct 22, 2:58 AM CDTSpecial Weather StatementLZKSearcy, Stone, Van Buren62 min
Oct 22, 3:10 AM CDTSevere Thunderstorm WarningLZKCleburne, Searcy, Stone, Van Buren50 min
Oct 22, 3:12 AM CDTSevere Thunderstorm WarningLZKGarland, Grant, Hot Spring, Saline48 min
Oct 22, 3:29 AM CDTSevere Thunderstorm WarningLZKCleburne, Faulkner, Van Buren, White29 min
Oct 22, 3:40 AM CDTSpecial Weather StatementLZKPulaski50 min
Oct 22, 3:55 AM CDTSpecial Weather StatementLZKGrant50 min
Oct 22, 3:58 AM CDTSpecial Weather StatementLZKCleburne, White47 min
Oct 22, 4:14 AM CDTSpecial Weather StatementLZKArkansas, Grant, Jefferson, Lonoke, Monroe, Prairie76 min
Oct 22, 4:23 AM CDTSevere Thunderstorm WarningLZKLonoke, Monroe, Prairie, White, Woodruff41 min
Oct 22, 5:04 AM CDTSpecial Weather StatementLZKPrairie, Woodruff26 min
Oct 22, 5:36 AM CDTSpecial Weather StatementLZKArkansas, Bradley, Desha, Drew, Lincoln54 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2017Every 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.