Alert archive / Indiana / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 9, NWS Indianapolis, IN
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
| Time | Report | Where | Remark |
|---|---|---|---|
| May 20, 12:03 PM EST | Thunderstorm Wind 0 | Montgomery, 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.
- 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
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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 19, 9:37 PM EST | Tornado Warning | IND | Perry, Spencer | 38 min |
| May 20, 12:25 PM EST | Severe Thunderstorm Warning | IND | Montgomery | 35 min |
| May 20, 1:23 PM EST | Severe Thunderstorm Warning | IND | Parke, Vermillion | 52 min |
| May 20, 2:28 PM EST | Severe Thunderstorm Warning | IND | Monroe, Owen | 47 min |
| May 20, 3:40 PM EST | Severe Thunderstorm Warning | IND | Monroe | 35 min |
| May 20, 4:00 PM EST | Flash Flood Warning | IND | Monroe, Owen | 2 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.