Alert archive / Michigan / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 38, NWS Grand Rapids, MI

June 10, 1999Allegan County, Barry County, Kent County, Michigan

NWS Grand Rapids, MI issued this severe thunderstorm warning at Jun 10, 1999, 10:08 PM EDT for Allegan County, Barry County, Kent County, Michigan. It was in force for 52 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 10, 1999, 10:08 PM EDT (02:08 UTC)
Expired: Jun 10, 1999, 11:00 PM EDT
In force: 52 min
Issued by: NWS Grand Rapids, MI
Area: Whole counties

Counties Allegan County, MI, Barry County, MI, Kent County, MI

What was reported inside it

Time	Report	Where	Remark
Jun 10, 10:24 PM EDT	Thunderstorm Wind	Alaska, MI	Trees were downed in Alaska, just northeat of Grand Rapids, and also in Rockford. Several trees and power lines were also downed in the vicinity of Lowell, just east of Cannonsburg, and just northwest of Byron Center (all in Kent County).

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.

The nearest sounding before it

Detroit, MI (KDTX), launched 00:00Z, 2.1 hours before the alert went out and 176 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: 932 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 1734 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: -8 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.

NWS Grand Rapids, MI wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 10, 2:50 PM EDT, 7 hours 18 minutes earlier.

Area forecast discussion, Jun 10, 2:50 PM EDT, 7 hours 18 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
Jun 11, 2:07 PM EDT	Severe Thunderstorm Warning	GRR	Allegan	38 min
Jun 11, 2:45 PM EDT	Severe Thunderstorm Warning	GRR	Allegan	30 min
Jun 11, 2:52 PM EDT	Severe Thunderstorm Warning	GRR	Ottawa	23 min
Jun 11, 3:05 PM EDT	Severe Thunderstorm Warning	GRR	Kent	40 min
Jun 11, 3:20 PM EDT	Severe Thunderstorm Warning	GRR	Montcalm	40 min
Jun 11, 3:36 PM EDT	Severe Thunderstorm Warning	GRR	Newaygo	24 min
Jun 11, 3:37 PM EDT	Severe Thunderstorm Warning	GRR	Kalamazoo	68 min
Jun 11, 3:49 PM EDT	Severe Thunderstorm Warning	GRR	Kent, Montcalm	41 min
Jun 11, 4:10 PM EDT	Severe Thunderstorm Warning	GRR	Barry	35 min

Nearby

Severe Thunderstorm Warnings in Michigan, 1999 Every severe thunderstorm warning in 1999

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.