Alert archive / Louisiana / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 39, NWS Shreveport, LA
NWS Shreveport, LA issued this severe thunderstorm warning at Mar 17, 1987, 10:10 AM CST for Jackson Parish, Winn Parish, Louisiana. It was in force for 70 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
- Mar 17, 1987, 10:10 AM CST (16:10 UTC)
- Expired
- Mar 17, 1987, 11:20 AM CST
- In force
- 70 min
- Issued by
- NWS Shreveport, LA
- Area
- Whole counties
Counties Jackson Parish, LA, Winn 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 |
|---|---|---|---|
| Mar 17, 10:30 AM CST | Thunderstorm Wind 0 | Jackson, 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
Longview/Gregg, TX (KGGG), launched 12:00Z, 4.2 hours before the alert went out and 190 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
- 376 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 724 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 274 m²/s²
- 0-3 km storm-relative helicity
- 386 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 3.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KSHV 171613 SVRSHV LAC049-127-171720- BULLETIN...IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SHREVEPORT LA 1010 AM CST TUE MAR 17 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1120 AM CST FOR PEOPLE IN THE FOLLOWING PARISHES IN NORTH LOUISIANA...JACKSON AND WINN AT 1010 AM CST THE NATIONAL WEATHER SERVICE RADAR IN SHREVEPORT SHOWED A STRONG LINE OF THUNDERSTORMS FROM NEAR HOMER LOUISIANA TO NEAR ARCADIA TO 15 MILES WEST OF JONESBORO TO MOVING EAST OF NATCHITOCHES TO 25 MILES WEST OF ALEXANDRIA ON SOUTHWARD. THE LINE WAS MOVING EAST AT AN AVERAGE SPEED OF 35 MPH...EXCEPT THAT PART APPROCHING THE WESTERN PART OF JACKSON AND WESTERN WINN PARISHES ...FOWARD SPEED INCREASING TO 50 MPH. HIGH DAMAGING WINDS POSSIBLE WITH THAT PART OF THE LINE OVER THE NEXT HOUR. TORNADO WATCH REMAINS IN EFFECT ALONG AND AHEAD OF THE LINE OF STRONG THUNDERSTORMS OVER NORTHCENTRAL AND NORTHEAST LOUISIANA. ISOLATED STRONG THUNDERSTORMS WERE AHEAD OF THE LINE FROM 30 SOUTHWEST OF MONROE TO NORTH OF ALEXANDRIA TO SOUTHWEST OF ALEXANDRIA..MOVING RAPIDLY NORTHEAST.
The office that day
Everything else NWS Shreveport, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 16, 10:50 PM CST | Severe Thunderstorm Warning | SHV | Caddo | 80 min |
| Mar 16, 11:10 PM CST | Severe Thunderstorm Warning | SHV | De Soto | 75 min |
| Mar 17, 8:00 AM CST | Severe Thunderstorm Warning | SHV | De Soto, Red River | 75 min |
| Mar 17, 11:20 AM CST | Severe Thunderstorm Warning | SHV | Madison, Tensas | 70 min |
Nearby
Severe Thunderstorm Warnings in Louisiana, 1987Every severe thunderstorm warning in 1987
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.