Alert archive / Louisiana / Tornado Warnings in 1990
Tornado Warning 17, NWS Shreveport, LA
NWS Shreveport, LA issued this tornado warning at May 12, 1990, 9:42 AM CDT for Natchitoches Parish, Louisiana. It was in force for 48 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, 9:42 AM CDT (14:42 UTC)
- Expired
- May 12, 1990, 10:30 AM CDT
- In force
- 48 min
- Issued by
- NWS Shreveport, LA
- Area
- Whole counties
County Natchitoches 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, 10:00 AM CDT | Tornado F1 | Natchitoches, 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
Lake Charles Mun, LA (KLCH), launched 12:00Z, 2.7 hours before the alert went out and 179 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
- 1655 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 555 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 280 m²/s²
- 0-3 km storm-relative helicity
- 430 m²/s²
- Significant tornado parameter
- 3.6
- Supercell composite
- 16.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KSHV 121442 TORSHV LAC069-121530- BULLETIN - EBS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE SHREVEPORT LA 942 AM CDT SAT MAY 12 1990 THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A TORNADO WARNING EFFECTIVE UNTIL 1030 AM CDT FOR PEOPLE IN THE FOLLOWING LOCATIONS.. IN NORTHWEST LOUISIANA ...SOUTHERN NATCHITOCHES PARISH AT 935 AM CDT THE NATIONAL WEATHER SERVICE RADAR IN SHREVEPORT SHOWED A POSSIBLE TORNADO 3 MILES EAST OF FLORIEN LOUISIANA. MOVEMENT WAS EAST NEAR 40 MPH. WIND DAMAGE AND HAIL HAVE BEEN REPORTED WITH THIS STORM. DO NOT USE YOUR CAR TO TRY TO OUTRUN A TORNADO. CARS ARE EASILY TOSSED AROUND BY TORNADO WINDS. IF YOU ARE CAUGHT IN THE PATH OF A TORNADO...LEAVE THE CAR AND GO TO A STRONG BUILDING. IF NO STRUCTURE IS NEARBY...SEEK SHELTER IN A DITCH OR LOW SPOT.
What forecasters said that day
The local office's own words before this tornado 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, 2 hours 23 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, 2 hours 22 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, 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, 11:46 AM CDT | Severe Thunderstorm Warning | SHV | Franklin | 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 |
Nearby
Tornado Warnings in Louisiana, 1990Every tornado warning in 1990Tornadoes 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.