Alert archive / Indiana / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 12, NWS Louisville, KY

February 21, 1997Orange County, Indiana

NWS Louisville, KY issued this severe thunderstorm warning at Feb 21, 1997, 7:54 AM EST for Orange County, Indiana. It was in force for 21 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: Feb 21, 1997, 7:54 AM EST (12:54 UTC)
Expired: Feb 21, 1997, 8:15 AM EST
In force: 21 min
Issued by: NWS Louisville, KY
Area: Whole counties

County Orange County, IN

The radar

The Louisville radar (KLVX), 79 km from the middle of the area, began a volume at 12:56 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 nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 0.9 hours before the alert went out and 253 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: 1012 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 205 m²/s²
0-3 km storm-relative helicity: 306 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSDF 211249
SVRSDF
INC117-211315-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LOUISVILLE KY
754 AM EST FRI FEB 21 1997
 
THE NATIONAL WEATHER SERVICE IN LOUISVILLE HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  815 AM EST
FOR PERSONS IN THE FOLLOWING LOCATION...
 
IN SOUTH INDIANA
 
   ...ORANGE COUNTY
 
AT 745 AM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM NEAR FRENCH LICK 45 MILES NORTHWEST OF LOUISVILLE. T
 WAS MOVING TO THE NORTHEAST AT 45 MPH AND WILL REACH ORLEANS AND PAOLI B8 AM EST.
 
WHEN THUNDERSTORMS OCCUR...MOVE INSIDE A STRONG BUILDING.  GO TO
THE INTERIOR SECTION...OR PREFERABLY A BASEMENT OR LOW$EST LEVEL
IF POSSIBLE.  DO NOT STAND NEAR WINDOWS. DO NOT USE TELEPHONES
OR ELECTRICAL APPLIANCES UNTIL THE STORM HAS PASSED. STAY AWAY FROM
ALL DOWNED WIRES.
 
KOCH/STUREY

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, Feb 21, 4:45 AM EST, 3 hours 9 minutes before

KYZ001>100-104-106>120-INZ076>079-083-084-089>092-211800-

KENTUCKY AND SOUTH CENTRAL INDIANA SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LOUISVILLE KY
445 AM EST FRI FEB 21 1997

LOW PRESSURE IN OKLAHOMA WILL MOVE TO NORTHERN OHIO THIS EVENING...
WHILE A COLD FRONT TRAILING FROM THE LOW ADVANCES TOWARD THE OHIO
VALLEY.

AS THE LOW AND COLD FRONT MOVE CLOSER TO THE REGION TWO ROUNDS OF
THUNDERSTORMS ARE EXPECTED. THE FIRST ROUND OF STORMS ACROSS WEST
KENTUCKY THIS MORNING SHOULD RACE TO THE MOUNTAINS OF EAST KENTUCKY
IN THE AFTERNOON. A SECOND ROUND OF STORMS WILL THEN REDEVELOP
ACROSS WEST KENTUCKY THIS AFTERNOON AND RACE EASTWARD TONIGHT.

BOTH BATCHES OF THUNDERSTORMS COULD CONTAIN DAMAGING WINDS AND
LARGE HAIL.

THIS IS A PRELIMINARY OUTLOOK.  STAY TUNED TO NATIONAL WEATHER
SERVICE RADIO FOR THE LATEST INFORMATION ON THIS POTENTIALLY
DANGEROUS WEATHER SITUATION.  SKYWARN SPOTTER ACTIVATION MAY BE
REQUESTED TODAY.

STUREY

The office that day

Everything else NWS Louisville, KY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 21, 8:22 AM EST	Severe Thunderstorm Warning	LMK	Perry	38 min
Feb 21, 9:44 AM EST	Severe Thunderstorm Warning	LMK	Jefferson	31 min

Nearby

Severe Thunderstorm Warnings in Indiana, 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.