Alert archive / Louisiana / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 99, NWS Shreveport, LA
NWS Shreveport, LA issued this severe thunderstorm warning at May 12, 1990, 11:46 AM CDT for Franklin Parish, Louisiana. It was in force for 59 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- May 12, 1990, 11:46 AM CDT (16:46 UTC)
- Expired
- May 12, 1990, 12:45 PM CDT
- In force
- 59 min
- Issued by
- NWS Shreveport, LA
- Area
- Whole counties
County Franklin Parish, LA
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 12, 12:20 PM CDT | Thunderstorm Wind 55 | Franklin, LA |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Jackson, MS (KJAN), launched 12:00Z, 4.8 hours before the alert went out and 151 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
- 7 J/kg
- Mixed-layer CIN
- -159 J/kg
- Mixed-layer LCL
- 604 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 82 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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.
In the hours before
Special weather statement, May 12, 7:19 AM CDT, 4 hours 27 minutes before
OKZ026-TXZ022-023-027-028-032-033-ARZ009-010-011-016-LAZ001-002- 003-004-005-006-121400- SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE SHREVEPORT LA 710 AM CDT SAT MAY 12 1990 ...A SEVERE THUNDERSTORM WARNING ISSUED EARLIER FOR SOUTHERN WINN PARISH HAS EXPIRED... AT 705 AM CDT THE NATIONAL WEATHER SERVICE RADAR IN SHREVEPORT SHOWED AN AREA OF SHOWERS AND THUNDERSTORMS THAT EXTENDED IN A 65 MILE WIDE AREA OVER NORTHWEST LOUISIANA..NORTHEAST TEXAS AND EXTREME SOUTHWEST ARKANSAS. THIS AREA EXTENDED FROM HOPE ARKANSAS TO LONGVIEW TEXAS TO JUST WEST OF LUFKIN TEXAS. MOVEMENT WAS EAST AT ABOUT 50 MPH. ALSO ISOLATED SHOWERS AND THUNDERSTORMS WERE NOTED ACROSS CENTRAL LOUISIANA NEAR GEORGETOWN..MONTGOMERY AND MANY. MOVEMENT WAS TO THE EAST AT 25 MPH. . GUSTY WINDS...DANGEROUS LIGHTNING AND LOCALLY HEAVY RAINFALL CAN BE EXPECTED WITH THESE STORMS THIS MORNING. A SEVERE THUNDERSTORM WATCH REMAINED IN EFFECT FOR MUCH OF THE AREA U]NTIL 9 PM THIS MORNING.
Special weather statement, May 12, 7:20 AM CDT, 4 hours 26 minutes before
OKZ026-TXZ022-023-027-028-032-033-ARZ009-010-011-016-LAZ001-002- 003-004-005-006-121400- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SHREVEPORT LA 710 AM CDT SAT MAY 12 1990 ...A SEVERE THUNDERSTORM WARNING ISSUED EARLIER FOR SOUTHERN WINN PARISH HAS EXPIRED... AT 705 AM CDT THE NATIONAL WEATHER SERVICE RADAR IN SHREVEPORT SHOWED AN AREA OF SHOWERS AND THUNDERSTORMS THAT EXTENDED IN A 65 MILE WIDE AREA OVER NORTHWEST LOUISIANA..NORTHEAST TEXAS AND EXTREME SOUTHWEST ARKANSAS. THIS AREA EXTENDED FROM HOPE ARKANSAS TO LONGVIEW TEXAS TO JUST WEST OF LUFKIN TEXAS. MOVEMENT WAS EAST AT ABOUT 50 MPH. ALSO ISOLATED SHOWERS AND THUNDERSTORMS WERE NOTED ACROSS CENTRAL LOUISIANA NEAR GEORGETOWN..MONTGOMERY AND MANY. MOVEMENT WAS TO THE EAST AT 25 MPH. . GUSTY WINDS...DANGEROUS LIGHTNING AND LOCALLY HEAVY RAINFALL CAN BE EXPECTED WITH THESE STORMS THIS MORNING. A SEVERE THUNDERSTORM WATCH REMAINED IN EFFECT FOR MUCH OF THE AREA `UNTIL 9 PM THIS MORNING.
The office that day
Everything else NWS Shreveport, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 12, 1:57 AM CDT | Severe Thunderstorm Warning | SHV | Bossier, Caddo | 48 min |
| May 12, 2:29 AM CDT | Severe Thunderstorm Warning | SHV | Claiborne, Webster | 61 min |
| May 12, 2:48 AM CDT | Tornado Warning | SHV | De Soto | 57 min |
| May 12, 5:13 AM CDT | Severe Thunderstorm Warning | SHV | Natchitoches | 62 min |
| May 12, 5:57 AM CDT | Severe Thunderstorm Warning | SHV | Winn | 63 min |
| May 12, 8:09 AM CDT | Severe Thunderstorm Warning | SHV | De Soto | 66 min |
| May 12, 8:49 AM CDT | Tornado Warning | SHV | Sabine | 56 min |
| May 12, 9:23 AM CDT | Flash Flood Warning | SHV | Bossier, Caddo, Red River, Webster | 4 hr |
| May 12, 9:23 AM CDT | Flash Flood Warning | SHV | De Soto, Natchitoches, Sabine | 4 hr |
| May 12, 9:42 AM CDT | Tornado Warning | SHV | Natchitoches | 48 min |
| May 12, 10:45 AM CDT | Severe Thunderstorm Warning | SHV | Caldwell, Winn | 60 min |
| May 12, 10:45 AM CDT | Severe Thunderstorm Warning | SHV | Ouachita | 60 min |
| May 12, 11:46 AM CDT | Severe Thunderstorm Warning | SHV | Caddo, De Soto | 59 min |
| May 12, 12:25 PM CDT | Severe Thunderstorm Warning | SHV | Madison, Tensas | 65 min |
| May 12, 12:41 PM CDT | Severe Thunderstorm Warning | SHV | Bienville, De Soto, Red River | 94 min |
| May 12, 1:30 PM CDT | Flash Flood Warning | SHV | Bienville, Bossier, Webster | 4 hr |
| May 12, 1:30 PM CDT | Flash Flood Warning | SHV | De Soto, Sabine | 4 hr |
| May 12, 1:30 PM CDT | Flash Flood Warning | SHV | Caddo | 4 hr |
| May 12, 1:30 PM CDT | Flash Flood Warning | SHV | Natchitoches, Red River | 4 hr |
| May 12, 1:50 PM CDT | Severe Thunderstorm Warning | SHV | Natchitoches, Winn | 55 min |
| May 12, 2:44 PM CDT | Severe Thunderstorm Warning | SHV | Caldwell, Winn | 61 min |
| May 12, 3:08 PM CDT | Flash Flood Warning | SHV | Winn | 2 hr |
| May 12, 3:51 PM CDT | Severe Thunderstorm Warning | SHV | Franklin, Tensas | 69 min |
| May 12, 6:48 PM CDT | Severe Thunderstorm Warning | SHV | Caddo, De Soto | 57 min |
| May 12, 2:06 AM CDT | Severe Thunderstorm Warning | SHV | Panola | 54 min |
| May 12, 2:20 AM CDT | Tornado Warning | SHV | Panola | 25 min |
| May 12, 9:23 AM CDT | Flash Flood Warning | SHV | Gregg, Harrison, Marion, Panola, Rusk | 4 hr |
| May 12, 9:23 AM CDT | Flash Flood Warning | SHV | Shelby | 4 hr |
| May 12, 10:45 AM CDT | Severe Thunderstorm Warning | SHV | Panola, Rusk | 60 min |
| May 12, 11:33 AM CDT | Severe Thunderstorm Warning | SHV | Bowie, Cass | 57 min |
| May 12, 1:09 PM CDT | Severe Thunderstorm Warning | SHV | Bowie, Cass | 66 min |
| May 12, 5:09 PM CDT | Severe Thunderstorm Warning | SHV | Gregg, Harrison, Rusk | 66 min |
| May 12, 6:12 PM CDT | Severe Thunderstorm Warning | SHV | Harrison, Panola, Rusk | 63 min |
| May 12, 6:36 PM CDT | Flash Flood Warning | SHV | Panola, Rusk, Shelby | 3 hr |
| May 12, 1:32 PM CDT | Severe Thunderstorm Warning | SHV | Columbia | 58 min |
Nearby
Severe Thunderstorm Warnings in Louisiana, 1990Every severe thunderstorm warning in 1990
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.