Alert archive / Louisiana / Tornado Warnings in 1998

Tornado Warning 20, NWS Shreveport, LA

April 27, 1998Natchitoches Parish, Louisiana

NWS Shreveport, LA issued this tornado warning at Apr 27, 1998, 6:54 PM CDT for Natchitoches Parish, Louisiana. It was in force for 36 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: Apr 27, 1998, 6:54 PM CDT (23:54 UTC)
Expired: Apr 27, 1998, 7:30 PM CDT
In force: 36 min
Issued by: NWS Shreveport, LA
Area: Whole counties

County Natchitoches Parish, LA

What was reported inside it

Time	Report	Where	Remark
Apr 27, 6:59 PM CDT	Hail 0.75	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.

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 11.9 hours before the alert went out and 104 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 935 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 532 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 197 m²/s²
0-3 km storm-relative helicity: 225 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.8

Open this sounding in Storm Lab

The text

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

384 
WFUS1 KSHV 272356 RRA
TORSHV
LAC069-280030-

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

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  EASTERN NATCHITOCHES PARISH IN NORTHWESTERN LOUISIANA

* UNTIL 730 PM CDT

* AT 653 PM CDT... THE SHREVEPORT NATIONAL WEATHER SERVICE DOPPLER
  RADAR INDICATED A TORNADO 4 MILES SOUTHWEST OF NATCHITOCHES.  THE
  THUNDERSTORM CONTAINING THIS TORNADO WAS MOVING NORTHEAST AT 30
  MPH.

* THE TORNADO IS EXPECTED TO BE NEAR...
  NATCHITOCHES AT 705 PM CDT

TORNADOES ASSOCIATED WITH THIS TYPE OF THUNDERSTORM WILL USUALLY
OCCUR ON THE SOUTH TO EAST PART OF THE STORM. THIS IS A DANGEROUS
SITUATION. GO TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STRONG
BUILDING.

3/10

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.

NWS Shreveport, LA wrote its last area forecast discussion before this tornado warning went out at Apr 27, 2:00 PM CDT, 4 hours 54 minutes earlier.

Area forecast discussion, Apr 27, 2:00 PM CDT, 4 hours 54 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
200 PM CDT MON APR 27 1998

QUASI STATIONARY FRONT AT 18Z EXTENDED FROM NEAR JOPLIN MO SOUTH
THROUGH EXTREME WESTERN AR TO NEAR SHREVEPORT AND SOUTH TO WEST OF
HOUSTON TX. A WEAK OUTFLOW BOUNDARY HAD PROGRESSED EAST TO NEAR EL
DORADO ARKANSAS...BUT WAS SLOWLY DISSIPATING. ANOTHER UPPER LEVEL
VORT MAX IS PROGGED TO ROTATE AROUND THE UPPER LOW TONIGHT. THIS
VORT MAX SHOULD MOVE OVER NORTHEAST TEXAS AND SOUTHEAST OKLAHOMA...
TRIGGERING NUMEROUS SHOWERS AND THUNDERSTORMS NEAR AND EAST
OF THE STATIONARY FRONT. SEVERE WEATHER RISK IS PROBABLY LOW
TONIGHT...BUT LATE THIS AFTERNOON AND EVENING COULD SEE A FEW STORMS
REACH SEVERE LIMITS OVER EXTREME EAST TEXAS AND NORTHWEST AND NORTH
CENTRAL LOUISIANA...AS WELL AS OVER SOUTHERN ARKANSAS. HEAVY RAIN
IS A POSSIBILITY TONIGHT ESPECIALLY OVER NORTHERN LOUISIANA AND
SOUTHERN ARKANSAS TONIGHT. RAIN SHOULD TAPER OFF TO SCATTERED SHOWERS
AND THUNDERSTORMS ON TUESDAY...BUT AS LONG AS THE STATIONARY FRONT IS
IN THE AREA...A CHANCE OF RAIN WILL CONTINUE. THE FRONT MAY
NOT MOVE EAST OF THE AREA UNTIL THURSDAY. TEMPS WILL BE COOLER TO
THE WEST OF THE FRONT OVER NORTHEAST TEXAS AND SOUTHEAST OKLAHOMA
AND PERSISTENTLY MILD TO THE EAST OF THE FRONT. PRELIMS BELOW...

SHV 60/77/56/78 7412   MLU 64/74/60/77 8623   03

03

In the hours before

Special weather statement, Apr 27, 2:50 PM CDT, 4 hours 4 minutes before

ARZ061-070>073-LAZ001>006-010>014-017>019-021-TXZ126-138-149>153-
165>167-272055-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
250 PM CDT MON APR 27 1998

...THUNDERSTORMS RAPIDLY DEVELOPING OVER NORTHWEST LOUISIANA AND
EAST TEXAS...

AT 245 PM CDT...THUNDERSTORMS WERE RAPIDLY DEVELOPING OVER NORTHWEST
LOUISIANA AND EAST TEXAS GENERALLY FROM SHREVEPORT/BOSSIER CITY
SOUTHWEST TO NEAR LUFKIN TEXAS.  OTHER THUNDERSTORMS WERE FORMING
NEAR RUSTON LOUISIANA AND JUST SOUTH OF EL DORADO ARKANSAS.

THESE THUNDERSTORMS MAY BECOME SEVERE THIS AFTERNOON ALONG AND
AHEAD OF A FRONT THAT HAS STALLED ALONG A LINE FROM NEAR FORT SMITH
ARKANSAS SOUTH TO LUFKIN TEXAS.

RESIDENTS OF NORTHWEST LOUISIANA AND EAST TEXAS SHOULD BE ALERT FOR
RAPIDLY DETERIORATING WEATHER CONDITIONS THIS AFTERNOON.

03

Special weather statement, Apr 27, 2:50 PM CDT, 4 hours 4 minutes before

ARZ061-070>073-LAZ001>006-010>014-017>019-021-TXZ126-138-149>153-
165>167-272055-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
250 PM CDT MON APR 27 1998

...THUNDERSTORMS RAPIDLY DEVELOPING OVER NORTHWEST LOUISIANA AND
EAST TEXAS...

AT 245 PM CDT...THUNDERSTORMS WERE RAPIDLY DEVELOPING OVER NORTHWEST
LOUISIANA AND EAST TEXAS GENERALLY FROM SHREVEPORT/BOSSIER CITY
SOUTHWEST TO NEAR LUFKIN TEXAS.  OTHER THUNDERSTORMS WERE FORMING
NEAR RUSTON LOUISIANA AND JUST SOUTH OF EL DORADO ARKANSAS.

THESE THUNDERSTORMS MAY BECOME SEVERE THIS AFTERNOON ALONG AND
AHEAD OF A FRONT THAT HAS STALLED ALONG A LINE FROM NEAR FORT SMITH
ARKANSAS SOUTH TO LUFKIN TEXAS.

RESIDENTS OF NORTHWEST LOUISIANA AND EAST TEXAS SHOULD BE ALERT FOR
RAPIDLY DETERIORATING WEATHER CONDITIONS THIS AFTERNOON.

03

Local storm report, Apr 27, 4:18 PM CDT, 2 hours 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
418 PM CDT MON APR 27 1998

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0308 PM    CENTER                    TX   .75 INCH HAIL
04/27/98   SHELBY

0330 PM    ARCADIA                   LA   .75 INCH HAIL
04/27/98   BIENVILLE

0400 PM    DUBACH                    LA   .75 INCH HAIL
04/27/98   LINCOLN                        DIME SIZED HAIL COVERING
                                          THE GROUND.

10

Local storm report, Apr 27, 4:18 PM CDT, 2 hours 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
418 PM CDT MON APR 27 1998

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0308 PM    CENTER                    TX   .75 INCH HAIL
04/27/98   SHELBY

0330 PM    ARCADIA                   LA   .75 INCH HAIL
04/27/98   BIENVILLE

0400 PM    DUBACH                    LA   .75 INCH HAIL
04/27/98   LINCOLN                        DIME SIZED HAIL COVERING
                                          THE GROUND.

10

Local storm report, Apr 27, 5:01 PM CDT, 1 hour 53 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
501 PM CDT MON APR 27 1998

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....PARISH/COUNTY LOCATION....

0428 PM    LUFKIN                    TX   1.75 INCH HAIL
04/27/98   ANGELINA

0430 PM    FARMERVILLE               LA   .88 INCH HAIL
04/27/98   UNION                          NICKEL SIZE HAIL OCCURRED
                                          5 MI N OF FARMERVILLE LA

Local storm report, Apr 27, 5:01 PM CDT, 1 hour 53 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
501 PM CDT MON APR 27 1998

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....PARISH/COUNTY LOCATION....

0428 PM    LUFKIN                    TX   1.75 INCH HAIL
04/27/98   ANGELINA

0430 PM    FARMERVILLE               LA   .88 INCH HAIL
04/27/98   UNION                          NICKEL SIZE HAIL OCCURRED
                                          5 MI N OF FARMERVILLE LA

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 27, 2:49 PM CDT	Severe Thunderstorm Warning	SHV	De Soto	46 min
Apr 27, 3:11 PM CDT	Severe Thunderstorm Warning	SHV	Bossier	34 min
Apr 27, 3:22 PM CDT	Severe Thunderstorm Warning	SHV	Bienville	33 min
Apr 27, 3:32 PM CDT	Severe Thunderstorm Warning	SHV	Lincoln	48 min
Apr 27, 4:36 PM CDT	Severe Thunderstorm Warning	SHV	De Soto	49 min
Apr 27, 5:31 PM CDT	Severe Thunderstorm Warning	SHV	Red River	34 min
Apr 27, 5:44 PM CDT	Severe Thunderstorm Warning	SHV	Sabine	51 min
Apr 27, 6:00 PM CDT	Severe Thunderstorm Warning	SHV	Bienville	45 min
Apr 27, 6:33 PM CDT	Tornado Warning	SHV	Bienville, Jackson	32 min

Nearby

Tornado Warnings in Louisiana, 1998 Every tornado warning in 1998 Tornadoes 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.