Alert archive / Louisiana / Special Weather Statements in 2021
Special Weather Statement, NWS Shreveport, LA
NWS Shreveport, LA issued this special weather statement at Mar 17, 2021, 11:02 AM CDT for Bienville Parish, Red River Parish, Webster Parish, Louisiana. It was in force for 43 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, 11:02 AM CDT (16:02 UTC)
- Expired
- Mar 17, 2021, 11:45 AM CDT
- In force
- 43 min
- Issued by
- NWS Shreveport, LA
Counties Bienville Parish, LA, Red River Parish, LA, Webster Parish, LA
The radar
The Shreveport radar (KSHV), 50 km from the middle of the area, began a volume at 16:06 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, 4.0 hours before the alert went out and 41 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
- 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
The text
As transmitted.
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</html>What forecasters said that day
The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Shreveport, LA wrote its last area forecast discussion before this special weather statement went out at Mar 17, 10:43 AM CDT, 19 minutes earlier.
Area forecast discussion, Mar 17, 10:43 AM CDT, 19 minutes before
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</html>Hazardous weather outlook, Mar 17, 6:01 AM CDT, 5 hours 1 minute before
Hazardous Weather Outlook...UPDATED National Weather Service Shreveport LA 601 AM CDT Wed Mar 17 2021 ARZ050-051-059>061-070-071-LAZ001-002-OKZ077-TXZ096-097-108>112- 124>126-136>138-149>151-181100- Sevier-Howard-Little River-Hempstead-Nevada-Miller-Lafayette- Caddo-Bossier-McCurtain-Red River-Bowie-Franklin-Titus-Camp- Morris-Cass-Wood-Upshur-Marion-Smith-Gregg-Harrison-Cherokee-Rusk- Panola- 601 AM CDT Wed Mar 17 2021 This Hazardous Weather Outlook is for portions of southwest Arkansas, northwest Louisiana, southeast Oklahoma and northeast Texas. .DAY ONE...Today and Tonight... ...A Severe Thunderstorm Watch is in effect until 10 AM... A broken line of strong to severe storms will move eastward into the region just after daybreak. Damaging winds and large hail will be the main threats, but the potential for embedded circulations with a tornado or two will be possible. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday... Gusty northwest winds will bring in cooler and drier air into the region on Thursday. A Lake Wind Advisory will be possible as sustained winds will approach 15 kts with gusts up to 25 kts. No other hazardous weather is expected at this time through early next week. .SPOTTER INFORMATION STATEMENT... Activation of emergency management personnel...amateur radio operators...and storm spotters will be needed today. ARZ072-073-LAZ003>006-010>014-017>022-TXZ152-153-165>167-181100- Columbia-Union-Webster-Claiborne-Lincoln-De Soto-Red River- Bienville-Jackson-Ouachita-Sabine-Natchitoches-Winn-Grant- Caldwell-La Salle-Nacogdoches-Shelby-Angelina-San Augustine- 601 AM CDT Wed Mar 17 2021 This Hazardous Weather Outlook is for portions of south central Arkansas, southwest Arkansas, north central Louisiana, northwest Louisiana and east Texas. .DAY ONE...Today and Tonight... Thunderstorms will increase in coverage and intensity as we moved throughout the day. Large hail, damaging winds, and tornadoes will be possible. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday... Gusty northwest winds will bring in cooler and drier air into the region on Thursday. A Lake Wind Advisory will be possible as sustained winds will approach 15 mph with gusts up to 25 mph. No other hazardous weather is expected at this time through early next week. .SPOTTER INFORMATION STATEMENT... Activation of emergency management personnel...amateur radio operators...and storm spotters will be needed today.
In the hours before
Local storm report, Mar 17, 10:16 AM CDT, 46 minutes before
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</html>Local storm report, Mar 17, 10:44 AM CDT, 18 minutes before
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</html>Local storm report, Mar 17, 10:46 AM CDT, 16 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1046 AM CDT WED MAR 17 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0852 AM TSTM WND DMG 4 SW UNCERTAIN 32.67N 94.17W
03/17/2021 HARRISON TX LAW ENFORCEMENT
TREES DOWN IN KARNACK, TROOPER VEHICLE
DAMAGED WITH FALLING TREE, NO INJURIES.
&&
25Special weather statement, Mar 17, 11:02 AM CDT, 0 minutes before
Special Weather Statement
National Weather Service Shreveport LA
1102 AM CDT Wed Mar 17 2021
LAZ001>004-010>012-018-171645-
De Soto LA-Bossier LA-Bienville LA-Natchitoches LA-Red River LA-
Claiborne LA-Caddo LA-Webster LA-
1102 AM CDT Wed Mar 17 2021
...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN WEBSTER...EASTERN DE
SOTO...RED RIVER...NORTH CENTRAL NATCHITOCHES...SOUTHEASTERN CADDO...
WESTERN CLAIBORNE...BIENVILLE AND SOUTHEASTERN BOSSIER PARISHES UNTIL
1145 AM CDT...
At 1102 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Bossier City to 14 miles east of Stonewall
to near Mansfield. Movement was northeast at 45 mph.
Pea size hail and winds in excess of 40 mph will be possible with
these storms.
Locations impacted include...
Shreveport, Bossier City, Minden, Homer, Haughton, Coushatta,
Ringgold, Sibley, Gibsland, Doyline, Dixie Inn, Dubberly, Heflin,
Eastwood, Martin, Hall Summit, Lucky, Ashland, Castor and Athens.
A Tornado Watch remains in effect until 100 PM CDT for northwestern
Louisiana.
LAT...LON 3294 9308 3259 9297 3209 9303 3187 9371
3220 9362 3249 9370
TIME...MOT...LOC 1602Z 234DEG 37KT 3245 9364 3224 9357 3197 9365
44The office that day
Everything else NWS Shreveport, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 17, 1:30 AM CDT | Special Weather Statement | SHV | Marion | 45 min |
| Mar 17, 2:45 AM CDT | Lake Wind Advisory | SHV | Angelina, Bowie, Camp, Cass, Cherokee, Franklin and 15 more | 40 hr |
| Mar 17, 6:12 AM CDT | Severe Thunderstorm Warning | SHV | Camp, Franklin, Smith, Titus, Wood | 63 min |
| Mar 17, 6:49 AM CDT | Special Weather Statement | SHV | Cherokee, Smith | 41 min |
| Mar 17, 6:56 AM CDT | Severe Thunderstorm Warning | SHV | Bowie, Camp, Franklin, Morris, Red River, Titus | 49 min |
| Mar 17, 7:08 AM CDT | Tornado Warning | SHV | Bowie, Cass, Morris, Red River, Titus | 37 min |
| Mar 17, 7:12 AM CDT | Special Weather Statement | SHV | Camp, Gregg, Morris, Upshur | 48 min |
| Mar 17, 7:32 AM CDT | Severe Thunderstorm Warning | SHV | Cherokee, Gregg, Harrison, Marion, Panola, Rusk and 2 more | 58 min |
| Mar 17, 7:36 AM CDT | Severe Thunderstorm Warning | SHV | Bowie, Cass, Morris | 54 min |
| Mar 17, 7:43 AM CDT | Severe Thunderstorm Warning | SHV | Cherokee, Nacogdoches, Panola, Rusk, Smith | 62 min |
| Mar 17, 7:59 AM CDT | Special Weather Statement | SHV | Cass | 31 min |
| Mar 17, 8:27 AM CDT | Severe Thunderstorm Warning | SHV | Angelina, Cherokee, Nacogdoches, Rusk, Shelby | 63 min |
| Mar 17, 8:34 AM CDT | Severe Thunderstorm Warning | SHV | Cass, Gregg, Harrison, Marion, Panola, Rusk | 56 min |
| Mar 17, 8:40 AM CDT | Severe Thunderstorm Warning | SHV | Nacogdoches, Panola, Rusk, Shelby | 44 min |
| Mar 17, 9:29 AM CDT | Severe Thunderstorm Warning | SHV | Nacogdoches, Panola, Rusk, San Augustine, Shelby | 61 min |
| Mar 17, 11:42 AM CDT | Severe Thunderstorm Warning | SHV | Angelina, Sabine, San Augustine | 48 min |
| Mar 17, 9:31 AM CDT | Special Weather Statement | SHV | Bossier, Caddo, Webster | 59 min |
| Mar 17, 10:29 AM CDT | Special Weather Statement | SHV | De Soto | 61 min |
| Mar 17, 10:36 AM CDT | Special Weather Statement | SHV | Claiborne, Webster | 39 min |
| Mar 17, 11:46 AM CDT | Special Weather Statement | SHV | Bienville, Jackson, Red River | 59 min |
| Mar 17, 12:36 PM CDT | Special Weather Statement | SHV | Natchitoches, Red River, Sabine | 39 min |
| Mar 17, 2:08 PM CDT | Severe Thunderstorm Warning | SHV | Bienville, Jackson, Lincoln, Ouachita, Union | 52 min |
| Mar 17, 2:16 PM CDT | Severe Thunderstorm Warning | SHV | Claiborne, Lincoln, Union | 44 min |
| Mar 17, 2:32 PM CDT | Tornado Warning | SHV | Union | 43 min |
| Mar 17, 2:58 PM CDT | Tornado Warning | SHV | Lincoln, Ouachita, Union | 47 min |
| Mar 17, 3:12 PM CDT | Tornado Warning | SHV | Jackson, Lincoln, Ouachita, Union | 48 min |
| Mar 17, 3:34 PM CDT | Tornado Warning | SHV | Union | 10 min |
| Mar 17, 12:14 AM CDT | Special Weather Statement | SHV | Union | 46 min |
| Mar 17, 12:21 AM CDT | Severe Thunderstorm Warning | SHV | Union | 39 min |
| Mar 17, 2:01 AM CDT | Special Weather Statement | SHV | Columbia, Lafayette | 44 min |
| Mar 17, 2:41 AM CDT | Special Weather Statement | SHV | Miller | 49 min |
| Mar 17, 8:37 AM CDT | Special Weather Statement | SHV | Hempstead, Lafayette, Miller, Nevada | 53 min |
| Mar 17, 9:26 AM CDT | Special Weather Statement | SHV | Columbia, Lafayette, Nevada | 64 min |
| Mar 16, 11:48 PM CDT | Special Weather Statement | SHV | McCurtain | 42 min |
| Mar 17, 12:43 AM CDT | Special Weather Statement | SHV | McCurtain | 17 min |
Nearby
Special Weather Statements in Louisiana, 2021Every special weather statement 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.