Alert archive / Louisiana / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 57, NWS Shreveport, LA
NWS Shreveport, LA issued this severe thunderstorm warning at Apr 11, 1986, 9:05 PM CST for Claiborne Parish, Webster Parish, Louisiana; Columbia County, Arkansas. It was in force for 60 min. 4 reports 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
- Apr 11, 1986, 9:05 PM CST (03:05 UTC)
- Expired
- Apr 11, 1986, 10:05 PM CST
- In force
- 60 min
- Issued by
- NWS Shreveport, LA
- Area
- Whole counties
Counties Columbia County, AR, Claiborne Parish, LA, Webster 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 |
|---|---|---|---|
| Apr 11, 9:20 PM CST | Hail 2 | Webster, LA | |
| Apr 11, 9:30 PM CST | Hail 1.75 | Columbia, AR | |
| Apr 11, 9:50 PM CST | Thunderstorm Wind 0 | Claiborne, LA | |
| Apr 11, 10:10 PM CST | Hail 1.75 | Claiborne, 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 00:00Z, 3.1 hours before the alert went out and 298 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2271 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 21 m²/s²
- 0-3 km storm-relative helicity
- 75 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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, Apr 11, 8:19 PM CST, 46 minutes before
NEWSPSSHV SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SHREVEPORT LA 815 PM CST FRI APR 12 1986 ...ISOLATED VERY HEAVY THUNDERSTORMS ARE MOVING OUT OF THE EXTREME NORTHEAST CORNER OF TEXAS INTO SOUTHWEST ARKNASAS... AT 810 PM THE WEATHER SERVICE RADAR IN SHREVEPORT INDICATED A COUPLE OF VERY STRONG THUNDERSTOMS...ONE ALONG THE RED RIVER SOUTHWEST OF ASHDOWN ARKANSAS AND THE OTHER ALONG THE CASS / BOWIE COUNTY LINE 10 MILES SOUTHWEST OF TEXARKANA. THESE STORMS WILL CAUSE HEAVY DOWNPOURS...FREQUENT CLOUD TO GROUND LIGHTNING AND SMALL HAIL AS THEY MOVE NORTHEAST THROUGH THE ASHDOWN AND TEXARKANA AREAS DURING THE NEXT HOUR. THEY WERE MOVING NORTHEAST 30 MPH. THE STORMS WERE PART OF AN AREA OS SCATTERED SHOWERS AND THUNDERSTOMRS THAT EXTENDED FROM NORTHWEST OF IDABEL OKLAHOMA SOUTHEAST INTO THE TEXARKANA AREA. OTHER WIDELY SCATTERED SHOWERS OR THUNDERSHOWERS WERE OCCURRING IN NORTHEAST TEXAS FROM NEAR LONGVIEW SOUTH INTO THE HENDERSON / CARTHAGE AREA.
The office that day
Everything else NWS Shreveport, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 11, 9:05 PM CST | Severe Thunderstorm Warning | SHV | Bossier | 20 min |
| Apr 11, 10:05 PM CST | Severe Thunderstorm Warning | SHV | Claiborne, Lincoln, Union | 65 min |
| Apr 11, 11:10 PM CST | Severe Thunderstorm Warning | SHV | Lincoln, Ouachita, Union | 60 min |
| Apr 11, 11:10 PM CST | Severe Thunderstorm Warning | SHV | Claiborne | 60 min |
| Apr 11, 11:27 PM CST | Tornado Warning | SHV | Ouachita, Richland | 48 min |
| Apr 11, 11:55 PM CST | Tornado Warning | SHV | Franklin | 35 min |
| Apr 12, 12:20 AM CST | Tornado Warning | SHV | Madison, Tensas | 40 min |
| Apr 12, 12:45 AM CST | Severe Thunderstorm Warning | SHV | Ouachita, Richland | 60 min |
| Apr 12, 1:45 AM CST | Severe Thunderstorm Warning | SHV | Caddo | 60 min |
| Apr 12, 1:45 AM CST | Severe Thunderstorm Warning | SHV | Bossier | 60 min |
| Apr 12, 2:29 AM CST | Severe Thunderstorm Warning | SHV | Tensas | 31 min |
| Apr 12, 2:45 AM CST | Severe Thunderstorm Warning | SHV | Bossier, Caddo | 60 min |
| Apr 12, 2:45 AM CST | Severe Thunderstorm Warning | SHV | Gregg, Rusk | 60 min |
| Apr 11, 10:50 PM CST | Severe Thunderstorm Warning | SHV | Columbia, Lafayette | 50 min |
Nearby
Severe Thunderstorm Warnings in Louisiana, 1986Severe Thunderstorm Warnings in Arkansas, 1986Every severe thunderstorm warning in 1986
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.