Alert archive / Indiana / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 9, NWS Indianapolis, IN

May 20, 1987Clinton County, Montgomery County, Indiana

NWS Indianapolis, IN issued this severe thunderstorm warning at May 20, 1987, 11:18 AM EST for Clinton County, Montgomery County, Indiana. It was in force for 57 min. 1 report 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
May 20, 1987, 11:18 AM EST (16:18 UTC)
Expired
May 20, 1987, 12:15 PM EST
In force
57 min
Issued by
NWS Indianapolis, IN
Area
Whole counties

Counties Clinton County, IN, Montgomery County, IN

The radar

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

What was reported inside it

TimeReportWhereRemark
May 20, 12:03 PM ESTThunderstorm Wind 0Montgomery, 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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Dayton/James M C, OH (KDAY), launched 12:00Z, 4.3 hours before the alert went out and 214 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 12:00Z on 1987-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Dayton/James M C, OH at 12:00Z on 1987-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 43 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1382 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
43 m²/s²
0-3 km storm-relative helicity
51 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 KIND 201619
SVRIND
INC107-023-201715-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
1118 AM EST WED MAY 20 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 1215 PM EST FOR PEOPLE IN THE FOLLOWING
COUNTIES OF

CENTRAL INDIANA...MONTGOMERY AND CLINTON.

AT 1115 AM EST...RADAR SHOWED A LINE OF SEVERE THUNDERSTORMS FROM
10 MILES NORTHWEST OF FRANKFORT TO 15 MILES SOUTHWEST OF
CRAWFORDSVILLE. THESE THUNDERSTORMS WERE MOVING EAST AT 15 MPH.

A SEVERE THUNDERSTORMS PRODUCES DAMAGING WINDS IN EXCESS OF
60 MILES AN HOUR...LARGE HAIL AND FREQUENT LIGHTNING.

THIS SLOW MOVING THUNDERSTORM MAY CAUSE FLOODING OF SMALL
STREAMS AND UNDERPASSES

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY FOR
RELAY TO THE NATIONAL WEATHER SERVICE.

HAINES

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, May 20, 9:08 AM EST, 2 hours 10 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
905 AM WED MAY 20 1987

...FOG ADVISORY FOR NORTHERN INDIANA IS NO LONGER IN EFFECT...

THE FOG ADVISORY THAT WAS ISSUED FOR THE NORTH THIRD OF INDIANA EARLIER
THIS MORNING IS NO LONGER IN EFFECT. AT 9 AM EST VISIBILITIES HAVE
IMPROVED TO 1/4 MILE OR BETTER AND CONTINUED IMPROVEMENT IS EXPECTED.

THERE ARE STILL PATCHY AREAS OF DENSE FOG WITH VISIBILITIES OF 1/8 MILE
IN NORTHEAST INDIANA. MOTORISTS SHOULD REMAIN ALERT WHEN DRIVING THROUGH
SECTIONS OF NORTHEAST INDIANA.

MEANWHILE... AT 9 AM EST A FEW SMALL AREAS OF THUNDERSTORMS MOVED INTO
SECTIONS OF NORTHWEST INDIANA BETWEEN LAFAYETTE AND GARY. A FEW OF THE
STORMS MAY PRODUCE HEAVY DOWNPOURS AS IT SLOWLY MOVES THROUGH NORTHERN
INDIANA THIS MORNING.

KOLDITZ
Special weather statement, May 20, 10:21 AM EST, 57 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
1015 AM EST WED MAY 20 1987

VERY STRONG THUNDERSTORMS CONTINUED TO FIRE UP OVER CENTRAL INDIANA.

AT 1010 AM EST A THUNDERSTORM WAS MOVING OVER DOWNTOWN INDIANAPOLIS.
HOWEVER THE STRONGEST STORMS WERE ABOUT 25 MILES NORTH
OF INDIANAPOLIS...SOUTH OF SHERIDAN AND ABOUT 40 MILES NORTH OF
INDIANAPOLIS...EAST OF FRANKFORT.

ALL OF THESE STORMS WERE MOVING EAST AT 10 MILES AN HOUR AND
WILL PRODUCE DRENCHING RAINS AND CONSIDERABLE LIGHTNING.

ANOTHER STRONG THUNDERSTORM HAS CROSSED INTO WEST CENTRAL INDIANA
EAST OF DANVILLE ILLINOIS OR ABOUT 40 MILES SOUTHWEST OF LAFAYETTE.

A NEW DEVELOPED THUNDERSTORM WAS 30 MILES NORTHWIEST OF INDIANPOLIS
SOUTHEAST OF CRAWFORDSVILLE.
EDWARDS

The office that day

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

IssuedProductOfficeCountiesLasted
May 19, 9:37 PM ESTTornado WarningINDPerry, Spencer38 min
May 20, 12:25 PM ESTSevere Thunderstorm WarningINDMontgomery35 min
May 20, 1:23 PM ESTSevere Thunderstorm WarningINDParke, Vermillion52 min
May 20, 2:28 PM ESTSevere Thunderstorm WarningINDMonroe, Owen47 min
May 20, 3:40 PM ESTSevere Thunderstorm WarningINDMonroe35 min
May 20, 4:00 PM ESTFlash Flood WarningINDMonroe, Owen2 hr

Nearby

Severe Thunderstorm Warnings in Indiana, 1987Every severe thunderstorm warning in 1987

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.