Alert archive / Louisiana / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 302, NWS New Orleans, LA

November 21, 1997Washington Parish, Louisiana; Walthall County, Mississippi

NWS New Orleans, LA issued this severe thunderstorm warning at Nov 21, 1997, 12:12 PM CST for Washington Parish, Louisiana; Walthall County, Mississippi. It was in force for 48 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: Nov 21, 1997, 12:12 PM CST (18:12 UTC)
Expired: Nov 21, 1997, 1:00 PM CST
In force: 48 min
Issued by: NWS New Orleans, LA
Area: Whole counties

Counties Washington Parish, LA, Walthall County, MS

The watch it was issued in

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

Issued	Product	Office	Lasted
Nov 21, 11:15 AM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 6.2 hours before the alert went out and 91 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: 20 J/kg
Mixed-layer CIN: -114 J/kg
Mixed-layer LCL: 981 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 192 m²/s²
0-3 km storm-relative helicity: 207 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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, Nov 21, 10:30 AM CST, 1 hour 42 minutes before

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Special weather statement, Nov 21, 10:50 AM CST, 1 hour 22 minutes before

LAZ049-050-057-058-040-038-039-MSZ077-071-221600-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1030 AM CST FRI NOV 21 1997

THERE IS A RISK OF SEVERE THUNDERSTORMS AND LOCALLY HEAVY RAIN ACROSS
SOUTH MISSISSIPPI AND SOUTHEAST LOUISIANA TODAY.  THE ATMOSPHERE HAS
BECOME VERY UNSTABLE AHEAD OF A SLOW MOVING COLD FRONT WHICH WILL BE
ENTERING THE WESTERN PART OF THE STATE TODAY.  THERE IS A STRONG UPPER
LEVEL SYSTEM THAT IS DRIVING THE COLD FRONT SLOWLY EAST.  AHEAD OF THE
UPPER LEVEL SYSTEM THE WINDS ARE STRENGTHENING AT ALL LEVELS.  THIS
WILL HELP TO DESTABILIZE THE ATMOSPHERE BY BRINGING WARM...MOIST AIR
INTO THE STATE.

THIS COMBINATION OF EVENTS IS ALREADY PRODUCING NUMEROUS THUNDERSTORMS
OVER PARTS OF SOUTHEAST LOUISIANA AND SOUTHWEST MISSISSIPPI WEST OF NEW
ORLEANS...AND NEAR THE BATON ROUGE LAFAYETTE AREA LATE THIS MORNING.
THE AREA OF THUNDERSTORMS WILL MOVE SLOWLY EAST FOR MOST OF THE DAY
BEFORE LEAVING THE AREA BY THIS EVENING. REMEMBER SEVERE THUNDERSTORMS
PRODUCE DAMAGING WINDS...LARGE HAIL AND SOMETIMES TORNADOES.  IN
ADDITION...THERE IS THE ADDED RISK OF LOCALLY HEAVY RAIN WHICH COULD
PRODUCING STREET FLOODING TODAY.

THIS AND OTHER WEATHER INFORMATION CAN BE ACCESSED THROUGH
NOAA WEATHER RADIO..LOCAL TELEVISION AND RADIO STATIONS..
CABLE OUTLETS..OR FROM OUR INTERNET HOMEPAGE ON THE WORLD
WIDE WEB AT --> HTTP://WWW.SRH.NOAA.GOV (LOWER CASE) UNDER
FORECAST OFFICES.

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 21, 10:49 AM CST	Severe Thunderstorm Warning	LIX	East Feliciana, Pointe Coupee, West Feliciana	41 min
Nov 21, 1:01 PM CST	Severe Thunderstorm Warning	LIX	Livingston, Tangipahoa	44 min
Nov 21, 1:20 PM CST	Severe Thunderstorm Warning	LIX	Saint Tammany, Washington	40 min
Nov 21, 1:41 PM CST	Tornado Warning	LIX	Saint Tammany	49 min
Nov 21, 7:45 AM CST	Severe Thunderstorm Warning	LIX	Wilkinson	30 min
Nov 21, 1:56 PM CST	Tornado Warning	LIX	Hancock, Pearl River	49 min
Nov 21, 2:43 PM CST	Tornado Warning	LIX	Hancock, Harrison	62 min
Nov 21, 3:00 PM CST	Severe Thunderstorm Warning	LIX	Pearl River	30 min
Nov 21, 3:46 PM CST	Tornado Warning	LIX	Harrison, Jackson	44 min
Nov 21, 4:38 PM CST	Severe Thunderstorm Warning	LIX	Jackson	52 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 1997 Severe Thunderstorm Warnings in Mississippi, 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.