Alert archive / Michigan / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 10, NWS Grand Rapids, MI

July 18, 1990Gratiot County, Michigan

NWS Grand Rapids, MI issued this severe thunderstorm warning at Jul 18, 1990, 4:21 PM EDT for Gratiot County, Michigan. It was in force for 39 min.

The area

The counties it named.

The facts

Issued: Jul 18, 1990, 4:21 PM EDT (20:21 UTC)
Expired: Jul 18, 1990, 5:00 PM EDT
In force: 39 min
Issued by: NWS Grand Rapids, MI
Area: Whole counties

County Gratiot County, MI

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

Detroit, MI (KFNT), launched 12:00Z, 8.4 hours before the alert went out and 115 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: NaN m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 116 m²/s²
0-3 km storm-relative helicity: 96 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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, Jul 18, 1:24 PM EDT, 2 hours 57 minutes before

MIZ014-051-053-181900

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE  MUSKEGON MI
120 PM EDT WED JUL 18 1990

...CLUSTER OF THUNDERSTORMS DROPPING SMALL HAIL...

RADAR SHOWED THUNDERSTORMS WITH VERY HEAVY RAINFALL EXTENDING FROM
OFF LITTLE SABLE POINT INLAND ACROSS SOUTHERN MASON...LAKE...AND NORTHERN
NEWAYGO COUNTIES. SMALL HAIL WAS REPORTED SOUTH OF SCOTTSVILLE IN MASON
COUNTY SHORTLY BEFORE 1PM.

STRONG GUSTY WINDS...DEADLY LIGHTNING STRIKES...HEAVY DOWNPOURS...AND
SMALL HAIL MAY ACCOMPANY THESE STORMS AS THEY MOVE SOUTHEAST AT ABOUT
25 MILES AN HOUR.

MOTORISTS SHOULD ALLOW EXTRA TIME FOR TRAVEL AS HEAVY RAINFALL WILL
SHARPLY REDUCE DRIVING VISIBILITIES AND CREATE PONDING OF WATER ACROSS
LOW LYING ROADWAYS.
DUBRISH

Special weather statement, Jul 18, 3:09 PM EDT, 1 hour 12 minutes before

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Local storm report, Jul 18, 3:39 PM EDT, 42 minutes before

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Special weather statement, Jul 18, 3:53 PM EDT, 28 minutes before

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Special weather statement, Jul 18, 3:54 PM EDT, 27 minutes before

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Special weather statement, Jul 18, 4:09 PM EDT, 12 minutes before

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The office that day

Everything else NWS Grand Rapids, MI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 18, 3:05 PM EDT	Severe Thunderstorm Warning	GRR	Isabella	55 min

Nearby

Severe Thunderstorm Warnings in Michigan, 1990 Every severe thunderstorm 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.