Alert archive / Arkansas / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 255, NWS Little Rock, AR

July 11, 2018Clark County, Pike County, Arkansas

NWS Little Rock, AR issued this severe thunderstorm warning at Jul 11, 2018, 5:49 PM CDT for Clark County, Pike County, Arkansas. It was in force for 26 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
Jul 11, 2018, 5:49 PM CDT (22:49 UTC)
Expired
Jul 11, 2018, 6:15 PM CDT
In force
26 min
Issued by
NWS Little Rock, AR
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Clark County, AR, Pike County, AR

The radar

The Little Rock radar (KLZK), 133 km from the middle of the area, began a volume at 22:53 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

Shreveport, LA (KBAD), launched 12:00Z, 10.8 hours before the alert went out and 184 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, Shreveport, LA at 12:00Z on 2018-07-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1494 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, Shreveport, LA at 12:00Z on 2018-07-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -6 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
1494 J/kg
Mixed-layer CIN
-46 J/kg
Mixed-layer LCL
953 m above ground
0-6 km bulk shear
4 kt
0-1 km storm-relative helicity
-6 m²/s²
0-3 km storm-relative helicity
4 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
Jul 11, 3:49 PM CDTSpecial Weather StatementLZKOuachita41 min
Jul 11, 3:57 PM CDTSpecial Weather StatementLZKScott18 min
Jul 11, 4:24 PM CDTSpecial Weather StatementLZKGarland21 min
Jul 11, 4:29 PM CDTSpecial Weather StatementLZKOuachita31 min
Jul 11, 4:32 PM CDTSpecial Weather StatementLZKOuachita28 min
Jul 11, 4:46 PM CDTSpecial Weather StatementLZKGarland29 min
Jul 11, 5:14 PM CDTSpecial Weather StatementLZKGarland31 min
Jul 11, 5:21 PM CDTSpecial Weather StatementLZKPolk24 min
Jul 11, 5:31 PM CDTSpecial Weather StatementLZKPike14 min
Jul 11, 5:35 PM CDTSpecial Weather StatementLZKPolk25 min
Jul 11, 5:46 PM CDTSevere Thunderstorm WarningLZKPolk29 min
Jul 11, 6:10 PM CDTSevere Thunderstorm WarningLZKPolk35 min
Jul 11, 6:12 PM CDTSpecial Weather StatementLZKPike48 min
Jul 11, 6:21 PM CDTSpecial Weather StatementLZKPolk39 min
Jul 11, 6:29 PM CDTSpecial Weather StatementLZKConway46 min
Jul 11, 6:33 PM CDTSpecial Weather StatementLZKPolk27 min
Jul 11, 6:40 PM CDTSpecial Weather StatementLZKPolk50 min
Jul 11, 6:57 PM CDTSpecial Weather StatementLZKPolk33 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.