Alert archive / Indiana / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 21, NWS Indianapolis, IN

April 30, 1997Knox County, Indiana

NWS Indianapolis, IN issued this severe thunderstorm warning at Apr 30, 1997, 5:52 PM EST for Knox County, Indiana. It was in force for 38 min. 2 reports 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 30, 1997, 5:52 PM EST (22:52 UTC)
Expired: Apr 30, 1997, 6:30 PM EST
In force: 38 min
Issued by: NWS Indianapolis, IN
Area: Whole counties

County Knox County, IN

What was reported inside it

Time	Report	Where	Remark
Apr 30, 5:53 PM EST	Thunderstorm Wind	Vincennes, IN
Apr 30, 6:00 PM EST	Thunderstorm Wind 59	Vincennes, IN

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 watch it was issued in

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

Issued	Product	Office	Lasted
Apr 30, 2:30 PM EST	Tornado Watch	SPC	7 hr
Apr 30, 5:30 PM EST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.9 hours before the alert went out and 192 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: 1130 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 115 m²/s²
0-3 km storm-relative helicity: 166 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.

976 
WUUS1 KIND 302254 RRA
SVRIND
INC083-302330-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
552 PM EST WED APR 30 1997
 
THE NATIONAL WEATHER SERVICE IN INDIANAPOLIS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  630 PM EST
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN SOUTHWEST INDIANA
 
   ...KNOX COUNTY
 
AT 550 PM EST NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM 5 MILES WEST OF VINCENNES. THIS STORM WAS MOVING NORTHEAST
AT 45 MPH. THE TOWN OF FREELANDVILLE IS IN THE PATH OF THIS STORM.
 
A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA.  REMEMBER
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES
WITH LITTLE OR NO ADVANCE WARNING.  REMAIN CALM BUT BE ALERT TO
RAPIDLY CHANGING WEATHER CONDITIONS.
 
STAY TUNED TO THIS SOURCE FOR LATER INFORMATION ON THIS SITUATION.
 
CS

The office that day

Everything else NWS Indianapolis, IN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 30, 5:04 PM EST	Tornado Warning	IND	Parke, Vermillion	26 min
Apr 30, 5:32 PM EST	Severe Thunderstorm Warning	IND	Montgomery	28 min
Apr 30, 6:06 PM EST	Severe Thunderstorm Warning	IND	Daviess	39 min
Apr 30, 6:24 PM EST	Severe Thunderstorm Warning	IND	Greene	36 min
Apr 30, 6:32 PM EST	Severe Thunderstorm Warning	IND	Monroe	28 min
Apr 30, 6:39 PM EST	Severe Thunderstorm Warning	IND	Hendricks	36 min
Apr 30, 6:43 PM EST	Severe Thunderstorm Warning	IND	Daviess, Knox	32 min
Apr 30, 6:52 PM EST	Severe Thunderstorm Warning	IND	Brown	38 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.