Alert archive / Michigan / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 129, NWS Grand Rapids, MI

September 26, 1998Mason County, Michigan

NWS Grand Rapids, MI issued this severe thunderstorm warning at Sep 26, 1998, 4:08 AM EDT for Mason County, Michigan. It was in force for 32 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
Sep 26, 1998, 4:08 AM EDT (08:08 UTC)
Expired
Sep 26, 1998, 4:40 AM EDT
In force
32 min
Issued by
NWS Grand Rapids, MI
Area
Whole counties

County Mason County, MI

What was reported inside it

TimeReportWhereRemark
Sep 26, 4:15 AM EDTHail 1Ludington, MI1 inch hail produced by Supercell moving east at 35 mph.

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

Green Bay/Straub, WI (KGRB), launched 00:00Z, 8.1 hours before the alert went out and 146 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, Green Bay/Straub, WI at 00:00Z on 1998-09-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 775 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, Green Bay/Straub, WI at 00:00Z on 1998-09-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 97 square meters per square second.1939587897Sfc1 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
775 J/kg
Mixed-layer CIN
-80 J/kg
Mixed-layer LCL
1020 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
97 m²/s²
0-3 km storm-relative helicity
146 m²/s²
Significant tornado parameter
0.5
Supercell composite
2.1

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.

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 26, 5:07 AM EDTSevere Thunderstorm WarningGRRLake, Mason33 min
Sep 26, 5:42 AM EDTSevere Thunderstorm WarningGRROsceola33 min
Sep 26, 6:16 AM EDTSevere Thunderstorm WarningGRRClare34 min
Sep 26, 7:20 AM EDTSevere Thunderstorm WarningGRRLake30 min
Sep 26, 7:51 AM EDTSevere Thunderstorm WarningGRROsceola34 min
Sep 26, 8:24 AM EDTSevere Thunderstorm WarningGRRClare31 min

Nearby

Severe Thunderstorm Warnings in Michigan, 1998Every severe thunderstorm warning in 1998

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.