Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 142, NWS Shreveport, LA

May 10, 20214 parishes in Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at May 10, 2021, 3:58 PM CDT for 4 parishes in Louisiana. It was in force for 25 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: May 10, 2021, 3:58 PM CDT (20:58 UTC)
Expired: May 10, 2021, 4:23 PM CDT
In force: 25 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Bienville Parish, LA, Bossier Parish, LA, Claiborne Parish, LA, Webster Parish, LA

The radar

The Shreveport radar (KSHV), 55 km from the middle of the area, began a volume at 20:59 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 (KSHV), launched 12:00Z, 9.0 hours before the alert went out and 46 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 257 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 552 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.4

Open this sounding in Storm Lab

The text

As transmitted.

382 
WUUS54 KSHV 102058
SVRSHV
LAC013-015-027-119-102145-
/O.NEW.KSHV.SV.W.0142.210510T2058Z-210510T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Shreveport LA
358 PM CDT Mon May 10 2021

The National Weather Service in Shreveport has issued a

* Severe Thunderstorm Warning for...
  Southern Webster Parish in northwestern Louisiana...
  Southwestern Claiborne Parish in northwestern Louisiana...
  Northeastern Bienville Parish in northwestern Louisiana...
  East central Bossier Parish in northwestern Louisiana...

* Until 445 PM CDT.

* At 358 PM CDT, a severe thunderstorm was located over Doyline, or
  10 miles southwest of Minden, moving east at 35 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...
  Minden, Haughton, Arcadia, Sibley, Gibsland, Doyline, Dubberly,
  Dixie Inn, Heflin, Athens, Bryceland, Mount Lebanon, Gilark, Noles
  Landing, Lake Bistineau North, Ogden and Ada.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3246 9352 3265 9349 3265 9288 3241 9288
TIME...MOT...LOC 2058Z 275DEG 32KT 3252 9342 

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

19

1 follow-up statement

501 
WWUS54 KSHV 102123
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
423 PM CDT Mon May 10 2021

LAC013-015-027-119-102132-
/O.CAN.KSHV.SV.W.0142.000000T0000Z-210510T2145Z/
Webster LA-Claiborne LA-Bienville LA-Bossier LA-
423 PM CDT Mon May 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN WEBSTER...
SOUTHWESTERN CLAIBORNE...NORTHEASTERN BIENVILLE AND EAST CENTRAL
BOSSIER PARISHES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.

LAT...LON 3246 9352 3265 9349 3265 9288 3241 9288
TIME...MOT...LOC 2117Z 275DEG 32KT 3250 9316 

$$

19

The office that day

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

Issued	Product	Office	Counties	Lasted
May 9, 7:02 PM CDT	Special Weather Statement	SHV	Grant, Natchitoches	58 min
May 9, 7:17 PM CDT	Severe Thunderstorm Warning	SHV	Claiborne, Webster	58 min
May 9, 7:22 PM CDT	Severe Thunderstorm Warning	SHV	Grant, Natchitoches, Sabine	53 min
May 9, 8:05 PM CDT	Special Weather Statement	SHV	Grant	55 min
May 9, 8:14 PM CDT	Special Weather Statement	SHV	Claiborne, Union	61 min
May 9, 8:15 PM CDT	Special Weather Statement	SHV	Webster	60 min
May 10, 2:25 PM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo	65 min
May 10, 2:53 PM CDT	Special Weather Statement	SHV	Caddo	52 min
May 10, 3:30 PM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo	45 min
May 10, 3:45 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Bossier, Caddo, De Soto, Webster	45 min
May 10, 3:54 PM CDT	Special Weather Statement	SHV	Webster	66 min
May 10, 4:16 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Bossier, Caddo, Natchitoches, Red River, Webster and 1 more	44 min
May 10, 4:56 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Jackson, Natchitoches, Winn	53 min
May 10, 5:30 PM CDT	Special Weather Statement	SHV	Grant, LaSalle	60 min
May 10, 6:28 PM CDT	Special Weather Statement	SHV	LaSalle	47 min
May 10, 6:36 PM CDT	Special Weather Statement	SHV	De Soto, Red River	39 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2021 Every 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.