Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 71, NWS Shreveport, LA

April 9, 20214 parishes in Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Apr 9, 2021, 6:40 PM CDT for 4 parishes in Louisiana. It was in force for 65 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Apr 9, 2021, 6:40 PM CDT (23:40 UTC)
Expired
Apr 9, 2021, 7:45 PM CDT
In force
65 min
Issued by
NWS Shreveport, LA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Bienville Parish, LA, Claiborne Parish, LA, Lincoln Parish, LA, Union Parish, LA

The radar

The Shreveport radar (KSHV), 106 km from the middle of the area, began a volume at 23:40 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.

What was reported inside it

TimeReportWhereRemark
Apr 9, 6:40 PM CDTHAIL 1Arcadia, LAPUBLIC POST OF QUARTER SIZE HAIL VIA SOCIAL MEDIA.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 9, 5:32 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 11.7 hours before the alert went out and 96 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 2021-04-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 928 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 2021-04-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 6 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
928 J/kg
Mixed-layer CIN
-310 J/kg
Mixed-layer LCL
1043 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
6 m²/s²
0-3 km storm-relative helicity
61 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

649 
WUUS54 KSHV 092340
SVRSHV
LAC013-027-061-111-100045-
/O.NEW.KSHV.SV.W.0071.210409T2340Z-210410T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Shreveport LA
640 PM CDT Fri Apr 9 2021

The National Weather Service in Shreveport has issued a

* Severe Thunderstorm Warning for...
  Western Union Parish in north central Louisiana...
  Southeastern Claiborne Parish in northwestern Louisiana...
  Northeastern Bienville Parish in northwestern Louisiana...
  Northern Lincoln Parish in north central Louisiana...

* Until 745 PM CDT.

* At 640 PM CDT, a severe thunderstorm was located over Arcadia, or
  10 miles west of Grambling, moving northeast at 30 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.

* Locations impacted include...
  Farmerville, Arcadia, Bernice, Cooley, Dubach, Simsboro, Vienna,
  Bayou D Arbonne Lake, Corinth, Shiloh, Mount Zion and Unionville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3249 9288 3264 9300 3293 9256 3273 9239
TIME...MOT...LOC 2340Z 232DEG 27KT 3258 9289 

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

19

The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 9, 2:28 PM CDTSevere Thunderstorm WarningSHVBossier, Caddo, Claiborne, Webster32 min
Apr 9, 2:51 PM CDTSpecial Weather StatementSHVCaddo39 min
Apr 9, 4:28 PM CDTSevere Thunderstorm WarningSHVBienville, Claiborne, Lincoln, Webster47 min
Apr 9, 5:01 PM CDTSevere Thunderstorm WarningSHVUnion44 min
Apr 9, 5:15 PM CDTSevere Thunderstorm WarningSHVClaiborne, Lincoln, Ouachita, Union45 min
Apr 9, 5:38 PM CDTSevere Thunderstorm WarningSHVBossier, Claiborne, Webster67 min
Apr 9, 5:40 PM CDTSpecial Weather StatementSHVDe Soto50 min
Apr 9, 5:44 PM CDTSevere Thunderstorm WarningSHVOuachita, Union46 min
Apr 9, 5:49 PM CDTSevere Thunderstorm WarningSHVDe Soto56 min
Apr 9, 5:54 PM CDTSevere Thunderstorm WarningSHVCaldwell, Jackson, Ouachita, Winn66 min
Apr 9, 5:58 PM CDTSevere Thunderstorm WarningSHVUnion21 min
Apr 9, 6:23 PM CDTSevere Thunderstorm WarningSHVBienville, Jackson, Lincoln, Natchitoches, Red River, Winn52 min
Apr 9, 6:27 PM CDTSpecial Weather StatementSHVBienville48 min
Apr 9, 6:37 PM CDTSpecial Weather StatementSHVOuachita38 min
Apr 9, 6:49 PM CDTSevere Thunderstorm WarningSHVBienville, Caddo, De Soto, Red River56 min
Apr 9, 6:55 PM CDTSevere Thunderstorm WarningSHVOuachita, Union65 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.