Alert archive / Michigan / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 87, NWS Indianapolis, IN

June 15, 1991Cass County, Michigan

NWS Indianapolis, IN issued this severe thunderstorm warning at Jun 15, 1991, 3:56 PM EST for Cass County, Michigan. It was in force for 49 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
Jun 15, 1991, 3:56 PM EST (20:56 UTC)
Expired
Jun 15, 1991, 4:45 PM EST
In force
49 min
Issued by
NWS Indianapolis, IN
Area
Whole counties

County Cass County, MI

What was reported inside it

TimeReportWhereRemark
Jun 15, 4:15 PM ESTThunderstorm Wind 0Cass, MI

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, 8.9 hours before the alert went out and 270 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 1991-06-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2266 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 1991-06-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 90 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
2266 J/kg
Mixed-layer CIN
-37 J/kg
Mixed-layer LCL
768 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
90 m²/s²
0-3 km storm-relative helicity
58 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.8

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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, Jun 15, 3:07 PM EST, 49 minutes before
INZALL-152100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
305 PM EST SAT JUN 15 1991

A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 900 PM EST FOR EXTREME
NORTHWEST INDIANA. THE WATCH AREA IS FOR THAT PART OF INDIANA NORTH AND
WEST OF A LINE FROM KENTLAND...TO KNOX...TO LA PORTE.

SOME CITIES INCLUDED IN THE WATCH ARE GARY...RENNSELAER...VALPRAISO...
AND CROWN POINT.

AT 300 PM EST NATIONAL WEATHER SERVICE RADAR SHOWED THUNDERSTORMS WITH
VERY HEAVY RAIN IN EXTREME NORTHWEST INDIANA NEAR CROWN POINT AND
VALPRAISO. ANOTHER THUNDERSTORM WAS JUST NORTH OF MOROCCO...WHICH IS 50
MILES NORTHWEST OF LAFAYETTE. THE THUNDERSTORMS WERE MOVING EAST AT 35
MPH.

PEOPLE IN EXT_REME NORTHWEST INDIANA SHOULD BE ALERT FOR RAPIDLY
CHANGING WEATHER CONDITIONS AND BE PREPARED TO TAKE SHELTER IF
THREATENING WEATHER APPROACHES.

SBH
Special weather statement, Jun 15, 3:43 PM EST, 13 minutes before
INZ009-152100-

SPECIAL WEATHER STATEMENT...WARM SPELL
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
325 PM EST SAT JUN 15 1991

AT 250 PM EST...THE TEMPERATURE AT THE INDIANAPOLIS INTERNATIONAL
AIRPORT REACHED 91 DEGREES. THIS IS THE WARMEST TEMPERATURE RECORED AT
INDIANAPOLIS SINCE SEPTEMBER 6 1990 WHEN THE HIGH WAS 92 DEGREES.

THE RECORD HIGH TEMPERATURE IN INDIANAPOLIS FOR TODAY IS 94 DEGREES
SET IN 1952 AND REPEATED IN 1954. THAT RECORD IS PROBABLY SAFE...
ALTHOUGH OUR TEMPERATURE WILL LIKELY RAISE ANOTHER DEGREE OR TWO
THIS AFTERNOON.

SO FAR IN JUNE...OUR DAILY AVERAGE TEMPERATURE IS 72.4 DEGREES...WHICH
IS 2.7 DEGREES ABOVE NORMAL AND WE HAVE HAD ABOVE NORMAL HIGH
TEMPRATURES ON ALL BUT 4 DAYS.

TEMPERATURES WILL COOL...AT LEAST TEMPORAIRLY TO MORE NORMAL SEASAONAL
VALUES TOMORROW AND MONDAY WITH HIGHS EXPECTED TO BE IN THE LOWER TO
MIDDLE 80S AND LOWS IN THE MIDDLE 60S.

THE 30 DAY OUTLOOK FOR MID JUNE THROUGH MID JULY CALLS FOR A RETURN
OF THE WARM SPELL WITH CENTRAL INDIANA TEMPERATURES EXPECTED TO AVERAGE
WARMER THEN NORMAL.

CT

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 15, 4:36 PM ESTSevere Thunderstorm WarningINDMarshall39 min
Jun 15, 5:00 PM ESTTornado WarningINDKosciusko30 min
Jun 15, 5:25 PM ESTSevere Thunderstorm WarningINDFulton50 min
Jun 15, 5:39 PM ESTSevere Thunderstorm WarningINDKosciusko51 min
Jun 15, 6:33 PM ESTSevere Thunderstorm WarningINDCarroll42 min
Jun 15, 6:47 PM ESTSevere Thunderstorm WarningINDBenton, Warren43 min

Nearby

Severe Thunderstorm Warnings in Michigan, 1991Every severe thunderstorm warning in 1991

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.