Alert archive / Indiana / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 21, NWS Northern Indiana

July 26, 1987Grant County, Indiana

NWS Northern Indiana issued this severe thunderstorm warning at Jul 26, 1987, 7:42 PM EST for Grant County, Indiana. It was in force for 18 min.

The area

The counties it named.

The facts

Issued
Jul 26, 1987, 7:42 PM EST (00:42 UTC)
Expired
Jul 26, 1987, 8:00 PM EST
In force
18 min
Issued by
NWS Northern Indiana
Area
Whole counties

County Grant 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, 0.7 hours before the alert went out and 141 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 1987-07-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 450 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 00:00Z on 1987-07-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 39 square meters per square second.193958Sfc1 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
450 J/kg
Mixed-layer CIN
-127 J/kg
Mixed-layer LCL
1088 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
39 m²/s²
0-3 km storm-relative helicity
70 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFWA 270042
SVRFWA
INC053-270100-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE FORT WAYNE IN
742 PM EST SUN JUL 26 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 800 PM EST FOR PEOPLE IN THE FOLLOWING 
COUNTY OF

NORTHEAST INDIANA...SOUTHERN GRANT

AT 740 PM EST RADAR INDICATED A SEVERE THUNDERSTORM 10 MILES
SOUTHWEST OF MARION INDIANA MOVING TOWARD THE SOUTH AT 30 MPgH.

...SEVERE THUNDERSTORMS...PRODUCE STRONG DAMAGING WINDS...
LARGE HAIL...HEAVY RAIN AND DEADLY LIGHTNING.

 MARSHALL

The office that day

Everything else NWS Northern Indiana issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 26, 7:22 PM ESTSevere Thunderstorm WarningIWXGrant23 min

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; the sounding from the Mesonet's radiosonde archive.