Alert archive / Texas / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 81, NWS Shreveport, LA

April 4, 1997Sabine County, San Augustine County, Texas

NWS Shreveport, LA issued this severe thunderstorm warning at Apr 4, 1997, 2:25 PM CST for Sabine County, San Augustine County, Texas. It was in force for 35 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 4, 1997, 2:25 PM CST (20:25 UTC)
Expired: Apr 4, 1997, 3:00 PM CST
In force: 35 min
Issued by: NWS Shreveport, LA
Area: Whole counties

Counties Sabine County, TX, San Augustine County, TX

The radar

The Ft Polk radar (KPOE), 101 km from the middle of the area, began a volume at 20:27 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watch it was issued in

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

Issued	Product	Office	Lasted
Apr 4, 2:15 PM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 8.4 hours before the alert went out and 126 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 533 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 154 m²/s²
0-3 km storm-relative helicity: 237 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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.

NWS Shreveport, LA wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 4, 9:59 AM CST, 4 hours 26 minutes earlier.

Area forecast discussion, Apr 4, 9:59 AM CST, 4 hours 26 minutes before

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In the hours before

Special weather statement, Apr 4, 9:30 AM CST, 4 hours 55 minutes before

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-TXZ096-
097-108>112-124>126-136>138-149>153-165>167-041700-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
930 AM CST FRI APR 4 1997

...SIGNIFICANT SEVERE WEATHER EVENT POSSIBLE LATE THIS AFTERNOON AND
INTO THE NIGHT FOR THE FOUR STATE AREA WHICH INCLUDES NORTHEAST TEXAS
...SOUTHEAST OKLAHOMA...SOUTHWEST ARKANSAS...AND NORTH LOUISIANA...

A DEEP UPPER LEVEL STORM SYSTEM WILL BE MOVING OUT OF THE DESERT
SOUTHWEST AND NORTHWEST MEXICO TODAY AND IT APPEARS THAT THIS SYSTEM
WILL LIKELY RESULT IN A SIGNIFICANT SEVERE WEATHER EPISODE ACROSS THE
FOUR STATES REGION LATE THIS AFTERNOON INTO TONIGHT. THUNDERSTORMS
ARE EXPECTED TO CONTINUE OFF AND ON THROUGH THIS AFTERNOON...BUT THE
MORE LIKELY SEVERE WEATHER THREAT WILL BE LATER AS THE UPPER LOW
APPROACHES.

SOME OF THESE STORMS WILL LIKELY BECOME SEVERE AS MOIST UNSTABLE AIR
FROM THE GULF OF MEXICO IS TRANSPORTED OVER THE REGION BY STRONG
SOUTHERLY WINDS. SOME STORMS COULD APPROACH NORTHEAST TEXAS BY
LATE AFTERNOON AND THEN SPREAD EAST OVER REMAINING SECTIONS DURING
THE NIGHT. THE SYSTEM WILL MOVE QUICKLY ACROSS THE REGION OVERNIGHT
WITH A COLD FRONT OVER WESTERN SECTIONS BEFORE MIDNIGHT AND THE
EASTERN HALF AROUND AND AFTER MIDNIGHT.

DUE TO THE FACT THAT WINDS WILL BE TURNING CLOCKWISE AND INCREASING
IN SPEED WITH HEIGHT IT APPEARS THAT STORMS THAT FORM TODAY COULD
DEVELOP ROTATION AND ISOLATED STORMS MAY PRODUCE TORNADOES. EVEN IF
NO TORNADOES FORM...THE STRENGTH OF THE WINDS ALOFT WILL RESULT IN A
SIGNIFICANT THREAT OF VERY DAMAGING STRAIGHT-LINE WINDS AS WELL AS
LARGE HAIL. AS WELL AS A SEVERE WEATHER EPISODE...SOME OF THE
THUNDERSTORMS WILL PRODUCE VERY HEAVY RAINFALL IN A SHORT PERIOD OF
TIME RESULTING IN RAPID WATER RUNOFF AND PONDING OF WATER IN LOW
LYING AND POOR DRAINAGE AREAS.

EMERGENCY MANAGEMENT OFFICIALS...STORM SPOTTERS AND HAM RADIO
OPERATORS SHOULD BE PREPARED FOR ACTIVATION POSSIBLY BY LATE THIS
AFTERNOON OVER PARTS OF NORTHEAST TEXAS AND SOUTHEAST OKLAHOMA
AND INTO THE NIGHT...THEN FOR SOUTHWEST ARKANSAS AND NORTH LOUISIANA
TONIGHT.

THOSE OFFICIALS AND SPOTTERS IN NORTHEAST TEXAS AND MCCURTAIN
COUNTY OKLAHOMA SHOULD BE PREPARED FOR ACTIVATION AS EARLY
AS THE AFTERNOON HOURS...THOSE IN SOUTH ARKANSAS AND NORTH CENTRAL
LOUISIANA MAY NOT BE NEEDED UNTIL THE EVENING HOURS AND
EASTERN SECTIONS AROUND AND AFTER MIDNIGHT.

SIX

Special weather statement, Apr 4, 9:32 AM CST, 4 hours 53 minutes before

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-TXZ096-
097-108>112-124>126-136>138-149>153-165>167-041700-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
930 AM CST FRI APR 4 1997

...SIGNIFICANT SEVERE WEATHER EVENT POSSIBLE LATE THIS AFTERNOON AND
INTO THE NIGHT FOR THE FOUR STATE AREA WHICH INCLUDES NORTHEAST TEXAS
...SOUTHEAST OKLAHOMA...SOUTHWEST ARKANSAS...AND NORTH LOUISIANA...

A DEEP UPPER LEVEL STORM SYSTEM WILL BE MOVING OUT OF THE DESERT
SOUTHWEST AND NORTHWEST MEXICO TODAY AND IT APPEARS THAT THIS SYSTEM
WILL LIKELY RESULT IN A SIGNIFICANT SEVERE WEATHER EPISODE ACROSS THE
FOUR STATES REGION LATE THIS AFTERNOON INTO TONIGHT. THUNDERSTORMS
ARE EXPECTED TO CONTINUE OFF AND ON THROUGH THIS AFTERNOON...BUT THE
MORE LIKELY SEVERE WEATHER THREAT WILL BE LATER AS THE UPPER LOW
APPROACHES.

SOME OF THESE STORMS WILL LIKELY BECOME SEVERE AS MOIST UNSTABLE AIR
FROM THE GULF OF MEXICO IS TRANSPORTED OVER THE REGION BY STRONG
SOUTHERLY WINDS. SOME STORMS COULD APPROACH NORTHEAST TEXAS BY
LATE AFTERNOON AND THEN SPREAD EAST OVER REMAINING SECTIONS DURING
THE NIGHT. THE SYSTEM WILL MOVE QUICKLY ACROSS THE REGION OVERNIGHT
WITH A COLD FRONT OVER WESTERN SECTIONS BEFORE MIDNIGHT AND THE
EASTERN HALF AROUND AND AFTER MIDNIGHT.

DUE TO THE FACT THAT WINDS WILL BE TURNING CLOCKWISE AND INCREASING
IN SPEED WITH HEIGHT IT APPEARS THAT STORMS THAT FORM TODAY COULD
DEVELOP ROTATION AND ISOLATED STORMS MAY PRODUCE TORNADOES. EVEN IF
NO TORNADOES FORM...THE STRENGTH OF THE WINDS ALOFT WILL RESULT IN A
SIGNIFICANT THREAT OF VERY DAMAGING STRAIGHT-LINE WINDS AS WELL AS
LARGE HAIL. AS WELL AS A SEVERE WEATHER EPISODE...SOME OF THE
THUNDERSTORMS WILL PRODUCE VERY HEAVY RAINFALL IN A SHORT PERIOD OF
TIME RESULTING IN RAPID WATER RUNOFF AND PONDING OF WATER IN LOW
LYING AND POOR DRAINAGE AREAS.

EMERGENCY MANAGEMENT OFFICIALS...STORM SPOTTERS AND HAM RADIO
OPERATORS SHOULD BE PREPARED FOR ACTIVATION POSSIBLY BY LATE THIS
AFTERNOON OVER PARTS OF NORTHEAST TEXAS AND SOUTHEAST OKLAHOMA
AND INTO THE NIGHT...THEN FOR SOUTHWEST ARKANSAS AND NORTH LOUISIANA
TONIGHT.

THOSE OFFICIALS AND SPOTTERS IN NORTHEAST TEXAS AND MCCURTAIN
COUNTY OKLAHOMA SHOULD BE PREPARED FOR ACTIVATION AS EARLY
AS THE AFTERNOON HOURS...THOSE IN SOUTH ARKANSAS AND NORTH CENTRAL
LOUISIANA MAY NOT BE NEEDED UNTIL THE EVENING HOURS AND
EASTERN SECTIONS AROUND AND AFTER MIDNIGHT.

SIX

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 4, 2:38 PM CST	Severe Thunderstorm Warning	SHV	Nacogdoches	52 min
Apr 4, 2:55 PM CST	Severe Thunderstorm Warning	SHV	Shelby	50 min
Apr 4, 3:23 PM CST	Tornado Warning	SHV	Shelby	37 min
Apr 4, 3:36 PM CST	Tornado Warning	SHV	Panola	39 min
Apr 4, 3:55 PM CST	Severe Thunderstorm Warning	SHV	De Soto	50 min
Apr 4, 4:11 PM CST	Severe Thunderstorm Warning	SHV	Bossier, Caddo	49 min
Apr 4, 4:23 PM CST	Flash Flood Warning	SHV	Bossier, Caddo	3 hr
Apr 4, 4:48 PM CST	Severe Thunderstorm Warning	SHV	Webster	27 min
Apr 4, 4:52 PM CST	Tornado Warning	SHV	Webster	38 min
Apr 4, 5:10 PM CST	Severe Thunderstorm Warning	SHV	Claiborne	50 min
Apr 4, 5:22 PM CST	Severe Thunderstorm Warning	SHV	Union	68 min

Nearby

Severe Thunderstorm Warnings in Texas, 1997 Every severe thunderstorm warning in 1997

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; radar from the NEXRAD Level II archive.