Alert archive / Louisiana / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 9, NWS Shreveport, LA

March 12, 1986Claiborne Parish, Lincoln Parish, Union Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Mar 12, 1986, 12:30 AM CST for Claiborne Parish, Lincoln Parish, Union Parish, Louisiana. It was in force for 65 min. 3 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
Mar 12, 1986, 12:30 AM CST (06:30 UTC)
Expired
Mar 12, 1986, 1:35 AM CST
In force
65 min
Issued by
NWS Shreveport, LA
Area
Whole counties

Counties Claiborne Parish, LA, Lincoln Parish, LA, Union 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

TimeReportWhereRemark
Mar 12, 12:50 AM CSTHail 1Claiborne, LA
Mar 12, 1:20 AM CSTThunderstorm Wind 0Lincoln, LA
Mar 12, 1:25 AM CSTThunderstorm Wind 0Union, 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 00:00Z, 6.5 hours before the alert went out and 186 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.

Skew-T log-pSkew-T log-p diagram, Longview/Gregg, TX at 00:00Z on 1986-03-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2309 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Longview/Gregg, TX at 00:00Z on 1986-03-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 323 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
2309 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
524 m above ground
0-6 km bulk shear
71 kt
0-1 km storm-relative helicity
323 m²/s²
0-3 km storm-relative helicity
327 m²/s²
Significant tornado parameter
5.0
Supercell composite
17.6

Open this sounding in Storm Lab

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, Mar 11, 7:58 PM CST, 4 hours 32 minutes before
NEWSPSSHV
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
755 PM CST TUE MAR 11 1986

TORNADO WATCH NOW IN EFFECT FOR THE NORTHWEST HALF OF THE ARKLATEX...
INCLUDES SOUTHWEST ARKANSAS..EXTREME SOUTHEAST OKLAHOMA AND MUCH OF
NORTHEAST TEXAS.

AT 755 PM CST THE NATIONAL WEATHER SERVICE RADAR IN SHREVEPORT WAS
SHOWING A LINE OF VERY STRONG THUNDERSTORMS FROM EAST CENTRAL OKLAHOMA
TO THE RED RIVER TO WEST OF HUGO ACROSS THE RED RIVER TO NEAR GREEN-
VILLE TEXAS TO THE WACO AREA. THIS SYSTEM WAS MOVING EAST NEAR 40 MPH.
SEVERE STORMS HAVE BEEN REPORTED ALONG PARTS OF THE LINE.

THUNDERSTORMS CONTINUE TO DEVELOP AHEAD OF THE LINE OVER EXTREME NORTH
EAST TEXAS INTO EXTREME SOUTHEAST OKLAHOMA AND SOUTHWEST ARKANSAS FROM
NEAR MENA ARKANSAS TO NEAR DEQUEEN AND FROM NORTH OF BATTIEST IN
SOUTHEAST OKLAHOMA TO SOUTHWEST OF IDABEL. THESE STORMS WERE ON THE
INCREASE AND SEVERE STORMS MAY DEVELOP WITHIN THE NEXT HOUR.

AS THE STRONG SYSTEM OVER NORTHCENTRAL TEXAS APPROCHES THE
WESTERN SECTIONS OF NORTHEAST TEXAS...NEW THUNDERSTORMS WILL
DEVELOP AHEAD OF THE LINE OVER NORTHEAST TEXAS RAPIDLY WITHIN
THE NEXT TWO HOURS.

ALTHOUGH THE TORNADO WATCH IS ONLY IN AFFECT FOR THE NORTHWEST
HALF OF THE ARKLATEX...THE POTENTIAL FOR SEVERE STORMS ALONG
WITH HEAVY RAINFALL WILL SPREAD INTO NORTH LOUISIANA AND THE
ADJACENT AREAS LATE TONIGHT THROUGH WEDNESDAY MORNING.

The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 11, 11:25 PM CSTSevere Thunderstorm WarningSHVBienville, Claiborne, Lincoln65 min
Mar 11, 11:40 PM CSTSevere Thunderstorm WarningSHVBossier, Caddo65 min
Mar 12, 12:30 AM CSTSevere Thunderstorm WarningSHVBienville, Jackson65 min
Mar 12, 12:30 AM CSTSevere Thunderstorm WarningSHVRed River65 min
Mar 12, 1:05 AM CSTSevere Thunderstorm WarningSHVNatchitoches, Winn65 min
Mar 12, 1:35 AM CSTSevere Thunderstorm WarningSHVCaldwell, Jackson, Ouachita65 min
Mar 12, 2:35 AM CSTSevere Thunderstorm WarningSHVFranklin, Tensas70 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 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.