Alert archive / Arkansas / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 124, NWS Little Rock, AR

May 20, 2018Sharp County, Arkansas

NWS Little Rock, AR issued this severe thunderstorm warning at May 20, 2018, 1:40 PM CDT for Sharp County, Arkansas. It was in force for 20 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 20, 2018, 1:40 PM CDT (18:40 UTC)
Expired
May 20, 2018, 2:00 PM CDT
In force
20 min
Issued by
NWS Little Rock, AR
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Sharp County, AR

The radar

The Little Rock radar (KLZK), 163 km from the middle of the area, began a volume at 18:40 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

Little Rock, AR (KBYH), launched 12:00Z, 6.7 hours before the alert went out and 203 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, Little Rock, AR at 12:00Z on 2018-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1368 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, Little Rock, AR at 12:00Z on 2018-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -28 square meters per square second.1939Sfc1 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
1368 J/kg
Mixed-layer CIN
-61 J/kg
Mixed-layer LCL
1256 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
-28 m²/s²
0-3 km storm-relative helicity
-10 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
May 20, 1:25 PM CDTSpecial Weather StatementLZKSharp35 min
May 20, 3:35 PM CDTSpecial Weather StatementLZKIndependence40 min
May 20, 3:53 PM CDTSevere Thunderstorm WarningLZKIndependence, Izard, Sharp, Stone37 min
May 20, 4:19 PM CDTSpecial Weather StatementLZKIndependence26 min
May 20, 4:23 PM CDTSpecial Weather StatementLZKIzard37 min
May 20, 4:44 PM CDTSpecial Weather StatementLZKIndependence46 min
May 20, 4:57 PM CDTSpecial Weather StatementLZKIzard48 min
May 20, 5:10 PM CDTSpecial Weather StatementLZKStone50 min
May 20, 6:06 PM CDTSpecial Weather StatementLZKBaxter39 min
May 20, 6:10 PM CDTSpecial Weather StatementLZKWoodruff35 min
May 20, 6:42 PM CDTSpecial Weather StatementLZKWoodruff33 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2018Every severe thunderstorm warning in 2018

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.