Alert archive / Indiana / Flash Flood Warnings in 1990

Flash Flood Warning 47, NWS Indianapolis, IN

August 17, 1990LaPorte County, Indiana

NWS Indianapolis, IN issued this flash flood warning at Aug 17, 1990, 10:12 PM CDT for LaPorte County, Indiana. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Aug 17, 1990, 10:12 PM CDT (03:12 UTC)
Expired
Aug 18, 1990, 2:15 AM CDT
In force
4 hr
Issued by
NWS Indianapolis, IN
Area
Whole counties

County LaPorte County, IN

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Dayton/James M C, OH (KDAY), launched 00:00Z, 3.2 hours before the alert went out and 282 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-pSkew-T log-p diagram, Dayton/James M C, OH at 00:00Z on 1990-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 82 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Dayton/James M C, OH at 00:00Z on 1990-08-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -12 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
82 J/kg
Mixed-layer CIN
-94 J/kg
Mixed-layer LCL
1144 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
-12 m²/s²
0-3 km storm-relative helicity
43 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 KSBN 180313
FFWSBN
INC091-180715-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SOUTH BEND IN
1012 PM EST (1012 PM CDT) FRI AUG 17 1990
 
THE NATIONAL WEATHER SERVICE IN SOUTH BEND HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  215 AM EST (215 AM CDT)
FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN NORTH CENTRAL INDIANA
          ...LAPORTE
 
AS OF 10 PM EST/CDT...UP TO 4 INCHES OF RAIN HAS FALLEN THIS EVENING
IN THE LAPORTE AND KINGSBURY INDIANA AREAS...18 MILES WEST SOUTHWEST
OF SOUTH BEND.
 
RADAR CONTINUES TO INDICATE THUNDERSTORMS MOVING THROUGH THIS AREA AND
ADDITIONAL HEAVY RAINFALL IS LIKELY TONIGHT.
 
 
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE
THE DANGERS OF FLOODS AND FLASH FLOODS.  IF FLASH FLOODING IS
OBSERVED...ACT QUICKLY.  MOVE UP TO ESCAPE FLOOD WATERS.  DO
NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
 
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHEREM THE WATER COVERS THE
ROADWAY.  THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO
CROSS SAFELY.  VEHICLES CAUGHT IN RISING WATER SHOULD BE
ABANDONED QUICKLY.  MOVE TO HIGHER GROUND.

What forecasters said that day

The local office's own words before this flash flood 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, Aug 17, 9:51 PM CDT, 21 minutes before
INZ006-010-180345-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE INDIANAPOLIS INDIANA
945 PM EST FRI AUG 18 1990

AT 940 PM EST...A VERY STRONG THUNDERSTORM WAS ALONG INTERSTATE 69 AT
MARION IN NORTHEST INDIANA.

JUST BEFORE 9PM EST...THE PERU STATE POLICE POST REPORTED BLINDING RAIN
...MARBLE SIZE HAIL AND WINDS ESTIMATED AT 30 MILES AN HOUR AND SMALL
TREE LIMBS DOWN AS THE STORM MOVED THROUGH SOUTHERN WABASH COUNTY.

THE STORM WAS MOVING SOUTHEAST AT 35 MILES AN HOUR AND WILL MOVE THROUGH
SOUTHEAST GRANT AND SOUTHWEST BLACKFORD COUNTIES AND INTO NORTHCENTRAL
DELAWARE COUNTY NEAR WHEELING AND EATON OR ABOUT 10 MILES NORTH OF MUNCIE
BY 1015 PM EST.

PERSON IN NORTHERN DELAWARE COUNT4Y SHOULD WATCH FOR THIS STORM AND BE
PREPARED TO TAKE SHELTER IF THREATENING WEATHER IS SIGHTED.

REPORT SEVERE WEATHER TO YOUR LOCAL LAW ENFORCEMENT AGENCTY FOR RELAY
TO THE NATIONAL WEATHER SERVICE.

CT

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 18, 6:30 AM CDTFlash Flood WarningINDMiami3 hr

Nearby

Flash Flood Warnings in Indiana, 1990Every flash flood warning in 1990

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.