Alert archive / Arkansas / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 63, NWS Shreveport, LA
NWS Shreveport, LA issued this severe thunderstorm warning at Apr 12, 2020, 7:18 PM CDT for Bossier Parish, Webster Parish, Louisiana; Columbia County, Lafayette County, Miller 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 counties it named.
The facts
- Issued
- Apr 12, 2020, 7:18 PM CDT (00:18 UTC)
- Expired
- Apr 12, 2020, 8:00 PM CDT
- 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, Lafayette County, AR, Miller County, AR, Bossier Parish, LA, Webster Parish, LA
The radar
The Shreveport radar (KSHV), 71 km from the middle of the area, began a volume at 00:17 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 |
|---|---|---|---|
| Apr 12, 5:59 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Apr 12, 2:51 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Jackson, MS (KJAN), launched 00:00Z, 0.3 hours before the alert went out and 333 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
- 1242 J/kg
- Mixed-layer CIN
- -27 J/kg
- Mixed-layer LCL
- 646 m above ground
- 0-6 km bulk shear
- 87 kt
- 0-1 km storm-relative helicity
- 31 m²/s²
- 0-3 km storm-relative helicity
- 61 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.5
What forecasters said that day
The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Apr 12, 6:48 PM CDT, 30 minutes earlier.
Area forecast discussion, Apr 12, 6:48 PM CDT, 30 minutes before
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</html>Hazardous weather outlook, Apr 12, 5:14 AM CDT, 14 hours 4 minutes before
Hazardous Weather Outlook National Weather Service Shreveport LA 514 AM CDT Sun Apr 12 2020 ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077- TXZ096-097-108>112-124>126-136>138-149>153-165>167-131200- Sevier-Howard-Little River-Hempstead-Nevada-Miller-Lafayette- Columbia-Union-Caddo-Bossier-Webster-Claiborne-Lincoln-De Soto- Red River-Bienville-Jackson-Ouachita-Sabine-Natchitoches-Winn- Grant-Caldwell-La Salle-McCurtain-Bowie-Franklin-Titus-Camp- Morris-Cass-Wood-Upshur-Marion-Smith-Gregg-Harrison-Cherokee-Rusk- Panola-Nacogdoches-Shelby-Angelina-San Augustine- 514 AM CDT Sun Apr 12 2020 This Hazardous Weather Outlook is for portions of south central Arkansas, southwest Arkansas, north central Louisiana, northwest Louisiana, southeast Oklahoma, east Texas and northeast Texas. .DAY ONE...Today and Tonight... A volatile airmass will be in place across much of the Four State Region. An upper level disturbance will move our way from the west, interact with this airmass and the end result will be severe thunderstorms, some of which will produce very large hail, destructive thunderstorm wind gusts and isolated tornadoes, some of which could be long tracked tornadoes. This threat will begin to taper off somewhat early this afternoon but rematerialize near and north of the Interstate 20 Corridor of Northeast Texas, Southeast Oklahoma, Southwest Arkansas and extreme Northern Louisiana as the upper trough itself moves overhead. The severe weather theat will then diminish late this evening across the entire Four State Region. .DAYS TWO THROUGH SEVEN...Monday through Saturday... No hazardous weather is anticipated at this time. .SPOTTER INFORMATION STATEMENT... Activation of emergency management personnel...amateur radio operators...and storm spotters will be needed today into this evening for severe thunderstorms. Please relay any information about observed severe weather to the NWS while following all local, state, and CDC guidelines. 13
In the hours before
Special weather statement, Apr 12, 6:35 PM CDT, 43 minutes before
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</html>Special weather statement, Apr 12, 6:41 PM CDT, 37 minutes before
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</html>Local storm report, Apr 12, 6:56 PM CDT, 22 minutes before
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</html>Local storm report, Apr 12, 6:57 PM CDT, 21 minutes before
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</html>Local storm report, Apr 12, 6:59 PM CDT, 19 minutes before
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</html>The office that day
Everything else NWS Shreveport, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 12, 7:26 PM CDT | Special Weather Statement | SHV | Cass, Franklin, Morris, Titus | 34 min |
| Apr 12, 7:29 PM CDT | Severe Thunderstorm Warning | SHV | Harrison, Marion, Panola, Rusk, Shelby | 46 min |
| Apr 12, 9:13 PM CDT | Special Weather Statement | SHV | Sabine, San Augustine, Shelby | 62 min |
| Apr 13, 8:33 AM CDT | River Flood Warning | SHV | Gregg, Smith, Upshur, Wood | 3 days |
| Apr 13, 8:33 AM CDT | River Flood Warning | SHV | Gregg, Rusk | 4 days |
| Apr 12, 7:49 PM CDT | Severe Thunderstorm Warning | SHV | Claiborne, Union, Webster | 56 min |
| Apr 12, 7:56 PM CDT | Special Weather Statement | SHV | Ouachita, Union | 49 min |
| Apr 12, 8:04 PM CDT | Severe Thunderstorm Warning | SHV | Ouachita, Union | 41 min |
| Apr 12, 8:17 PM CDT | Special Weather Statement | SHV | Bienville, De Soto, Jackson, Lincoln, Ouachita, Red River | 43 min |
| Apr 12, 8:37 PM CDT | Severe Thunderstorm Warning | SHV | Bienville, Bossier, Caddo, De Soto, Natchitoches, Red River and 2 more | 31 min |
| Apr 12, 9:05 PM CDT | Special Weather Statement | SHV | Caldwell, Jackson, Ouachita, Winn | 40 min |
| Apr 12, 9:26 PM CDT | Special Weather Statement | SHV | Ouachita | 49 min |
| Apr 12, 7:10 PM CDT | Severe Thunderstorm Warning | SHV | Columbia, Nevada, Union | 65 min |
| Apr 12, 7:13 PM CDT | Special Weather Statement | SHV | Lafayette | 62 min |
Nearby
Severe Thunderstorm Warnings in Arkansas, 2020Severe Thunderstorm Warnings in Louisiana, 2020Every severe thunderstorm warning in 2020
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.