Alert archive / Arkansas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 21, NWS Jackson, MS

March 17, 2021Ashley County, Arkansas

NWS Jackson, MS issued this severe thunderstorm warning at Mar 17, 2021, 3:33 PM CDT for Ashley County, Arkansas. It was in force for 42 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Mar 17, 2021, 3:33 PM CDT (20:33 UTC)
Expired
Mar 17, 2021, 4:15 PM CDT
In force
42 min
Issued by
NWS Jackson, MS
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Ashley County, AR

The radar

The Little Rock radar (KLZK), 173 km from the middle of the area, began a volume at 20:35 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
Mar 17, 12:57 PM CDTTornado Watch PDSSPC6 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 8.6 hours before the alert went out and 188 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 2021-03-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1417 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 2021-03-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 328 square meters per square second.1939587897Sfc1 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
1417 J/kg
Mixed-layer CIN
-55 J/kg
Mixed-layer LCL
682 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
328 m²/s²
0-3 km storm-relative helicity
340 m²/s²
Significant tornado parameter
2.7
Supercell composite
14.5

Open this sounding in Storm Lab

The text

As transmitted.

606 
WUUS54 KJAN 172033 RRA
SVRJAN
ARC003-172115-
/O.NEW.KJAN.SV.W.0021.210317T2033Z-210317T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Jackson MS
333 PM CDT Wed Mar 17 2021

The National Weather Service in Jackson has issued a

* Severe Thunderstorm Warning for...
  Northwestern Ashley County in southeastern Arkansas...

* Until 415 PM CDT.

* At 333 PM CDT, a severe thunderstorm was located near Old Milo, or
  near North Crossett, moving northeast at 65 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* This severe thunderstorm will be near...
  Fountain Hill around 345 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

A Tornado Watch remains in effect until 700 PM CDT for southeastern
Arkansas.

LAT...LON 3325 9207 3326 9205 3327 9204 3328 9204
      3328 9200 3330 9200 3330 9198 3333 9198
      3335 9199 3335 9197 3338 9196 3340 9194
      3339 9162 3313 9197 3324 9208
TIME...MOT...LOC 2033Z 230DEG 57KT 3325 9198 

HAIL...1.00IN
WIND...60MPH
 
$$

JC
1 follow-up statement
687 
WWUS54 KJAN 172042
SVSJAN

Severe Weather Statement
National Weather Service Jackson MS
342 PM CDT Wed Mar 17 2021

ARC003-172115-
/O.CON.KJAN.SV.W.0021.000000T0000Z-210317T2115Z/
Ashley AR-
342 PM CDT Wed Mar 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM CDT
FOR NORTHWESTERN ASHLEY COUNTY...

At 340 PM CDT, a severe thunderstorm was located over Fountain Hill,
or 8 miles northwest of Hamburg, moving northeast at 65 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

This severe thunderstorm will remain over mainly rural areas of
northwestern Ashley County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

A Tornado Watch remains in effect until 700 PM CDT for southeastern
Arkansas.

LAT...LON 3325 9207 3326 9205 3327 9204 3328 9204
      3328 9200 3330 9200 3330 9198 3333 9198
      3335 9199 3335 9197 3338 9196 3340 9194
      3339 9162 3313 9197 3324 9208
TIME...MOT...LOC 2040Z 230DEG 57KT 3333 9187 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$

JC

The office that day

Everything else NWS Jackson, MS issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 17, 4:45 PM CDTSevere Thunderstorm WarningJANChicot60 min
Mar 17, 4:56 PM CDTTornado WarningJANChicot29 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2021Every severe thunderstorm warning in 2021

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.