Alert archive / Arkansas / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 221, NWS Shreveport, LA
NWS Shreveport, LA issued this severe thunderstorm warning at Dec 29, 2021, 1:33 PM CST for Columbia County, Union County, Arkansas; Claiborne Parish, Webster Parish, Louisiana. 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
- Dec 29, 2021, 1:33 PM CST (19:33 UTC)
- Expired
- Dec 29, 2021, 2:15 PM CST
- In force
- 42 min
- Issued by
- NWS Shreveport, LA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Columbia County, AR, Union County, AR, Claiborne Parish, LA, Webster Parish, LA
The radar
The Shreveport radar (KSHV), 88 km from the middle of the area, began a volume at 19:37 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.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Dec 29, 12:05 PM CST | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Shreveport, LA (KSHV), launched 12:00Z, 7.6 hours before the alert went out and 80 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.
- Mixed-layer CAPE
- 272 J/kg
- Mixed-layer CIN
- -90 J/kg
- Mixed-layer LCL
- 687 m above ground
- 0-6 km bulk shear
- 65 kt
- 0-1 km storm-relative helicity
- 146 m²/s²
- 0-3 km storm-relative helicity
- -4 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 2.5
The text
As transmitted.
524
WUUS54 KSHV 291933
SVRSHV
ARC027-139-LAC027-119-292015-
/O.NEW.KSHV.SV.W.0221.211229T1933Z-211229T2015Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Shreveport LA
133 PM CST Wed Dec 29 2021
The National Weather Service in Shreveport has issued a
* Severe Thunderstorm Warning for...
Southwestern Union County in south central Arkansas...
Southeastern Columbia County in southwestern Arkansas...
North central Webster Parish in northwestern Louisiana...
Northern Claiborne Parish in northwestern Louisiana...
* Until 215 PM CST.
* At 133 PM CST, a severe thunderstorm was located near Shongaloo, or
12 miles east of Springhill, moving northeast 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...
Haynesville, Shongaloo, Atlanta, Hew Hope, Leton and Three Creeks.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 700 PM CST for south central
Arkansas...and northwestern Louisiana.
For your protection move to an interior room on the lowest floor of a
building.
A Tornado Watch remains in effect until 700 PM CST for south central
Arkansas...and northwestern Louisiana.
&&
LAT...LON 3285 9329 3299 9337 3323 9293 3295 9278
TIME...MOT...LOC 1933Z 246DEG 32KT 3297 9325
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
/26/1 follow-up statement
453
WWUS54 KSHV 291955
SVSSHV
Severe Weather Statement
National Weather Service Shreveport LA
155 PM CST Wed Dec 29 2021
LAC119-292004-
/O.CAN.KSHV.SV.W.0221.000000T0000Z-211229T2015Z/
Webster LA-
155 PM CST Wed Dec 29 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL WEBSTER PARISH
IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 700 PM CST for south central
Arkansas...and northwestern Louisiana.
LAT...LON 3292 9311 3310 9317 3323 9293 3295 9278
TIME...MOT...LOC 1954Z 246DEG 32KT 3305 9304
$$
ARC027-139-LAC027-292015-
/O.CON.KSHV.SV.W.0221.000000T0000Z-211229T2015Z/
Union AR-Columbia AR-Claiborne LA-
155 PM CST Wed Dec 29 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 PM CST
FOR SOUTHWESTERN UNION...SOUTHEASTERN COLUMBIA COUNTIES IN
SOUTHWESTERN ARKANSAS AND NORTHEASTERN CLAIBORNE PARISHES...
At 154 PM CST, a severe thunderstorm was located over Atlanta, or 17
miles north of Homer, moving northeast 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...
Haynesville, Atlanta, Hew Hope and Three Creeks.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 700 PM CST for south central
Arkansas...and northwestern Louisiana.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3292 9311 3310 9317 3323 9293 3295 9278
TIME...MOT...LOC 1954Z 246DEG 32KT 3305 9304
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
/26/The office that day
Everything else NWS Shreveport, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 29, 9:43 AM CST | Special Weather Statement | SHV | Howard, Sevier | 32 min |
| Dec 29, 1:15 PM CST | Special Weather Statement | SHV | Columbia | 30 min |
| Dec 29, 2:11 PM CST | Special Weather Statement | SHV | Union | 34 min |
| Dec 29, 4:23 PM CST | Special Weather Statement | SHV | Union | 52 min |
| Dec 29, 4:32 PM CST | Special Weather Statement | SHV | Hempstead | 43 min |
| Dec 29, 4:35 PM CST | Special Weather Statement | SHV | Miller | 40 min |
| Dec 29, 5:15 PM CST | Special Weather Statement | SHV | Nevada | 30 min |
| Dec 29, 12:51 PM CST | Special Weather Statement | SHV | Bossier | 24 min |
Nearby
Severe Thunderstorm Warnings in Arkansas, 2021Severe 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.