Alert archive / Louisiana / Tornado Warnings in 1998

Tornado Warning 21, NWS Shreveport, LA

April 27, 1998Winn Parish, Louisiana

NWS Shreveport, LA issued this tornado warning at Apr 27, 1998, 7:11 PM CDT for Winn Parish, Louisiana. It was in force for 49 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Apr 27, 1998, 7:11 PM CDT (00:11 UTC)
Expired
Apr 27, 1998, 8:00 PM CDT
In force
49 min
Issued by
NWS Shreveport, LA
Area
Whole counties

County Winn Parish, LA

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 27, 3:30 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 0.2 hours before the alert went out and 120 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, Shreveport, LA at 00:00Z on 1998-04-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 10 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Shreveport, LA at 00:00Z on 1998-04-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -124 square meters per square second.19395878Sfc1 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
10 J/kg
Mixed-layer CIN
-228 J/kg
Mixed-layer LCL
937 m above ground
0-6 km bulk shear
64 kt
0-1 km storm-relative helicity
-124 m²/s²
0-3 km storm-relative helicity
179 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

500 
WFUS1 KSHV 280013 RRA
TORSHV
LAC127-280100-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
711 PM CDT MON APR 27 1998

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  WINN PARISH IN NORTH CENTRAL LOUISIANA

* UNTIL 800 PM CDT

* AT 709 PM CDT... THE SHREVEPORT NATIONAL WEATHER SERVICE DOPPLER
  RADAR INDICATED A TORNADO 18 MILES SOUTHWEST OF WINNFIELD.  THE
  THUNDERSTORM CONTAINING THIS TORNADO WAS MOVING EAST NORTHEAST AT
  30 MPH..

* THE TORNADO IS EXPECTED TO BE NEAR...
  ATLANTA BY 725 PM CDT

THIS THUNDERSTORM MAY PRODUCE A TORNADO ON ITS LEADING EDGE.
IF YOU ARE OUTSIDE GO TO A STRONG BUILDING. MOVE TO AN INTERIOR
ROOM ON THE LOWEST FLOOR.

3/10

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 27, 7:24 PM CDTSevere Thunderstorm WarningSHVOuachita46 min
Apr 27, 7:48 PM CDTTornado WarningSHVOuachita32 min
Apr 27, 8:02 PM CDTSevere Thunderstorm WarningSHVWinn48 min
Apr 27, 8:24 PM CDTSevere Thunderstorm WarningSHVOuachita61 min
Apr 27, 8:41 PM CDTSevere Thunderstorm WarningSHVGrant49 min
Apr 27, 10:00 PM CDTSevere Thunderstorm WarningSHVLaSalle30 min

Nearby

Tornado Warnings in Louisiana, 1998Every tornado warning in 1998Tornadoes in 1998

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.