Alert archive / Michigan / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 84, NWS Detroit, MI

July 21, 1998Lenawee County, Michigan

NWS Detroit, MI issued this severe thunderstorm warning at Jul 21, 1998, 7:32 AM EDT for Lenawee County, Michigan. It was in force for 58 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
Jul 21, 1998, 7:32 AM EDT (11:32 UTC)
Expired
Jul 21, 1998, 8:30 AM EDT
In force
58 min
Issued by
NWS Detroit, MI
Area
Whole counties

County Lenawee County, MI

The radar

The Detroit radar (KDTX), 102 km from the middle of the area, began a volume at 11:35 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
Jul 21, 8:05 AM EDTThunderstorm Wind 52Tecumseh, 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.

The nearest sounding before it

Detroit, MI (KDTX), launched 00:00Z, 11.5 hours before the alert went out and 106 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, Detroit, MI at 00:00Z on 1998-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 joules per kilogram.LCLEL10008507005003002001001 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, Detroit, MI at 00:00Z on 1998-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 37 square meters per square second.19395878Sfc1 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
4 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
2132 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
37 m²/s²
0-3 km storm-relative helicity
45 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.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 21, 7:24 AM EDTTornado WarningDTXWashtenaw66 min
Jul 21, 8:12 AM EDTSevere Thunderstorm WarningDTXMonroe33 min
Jul 21, 5:23 PM EDTSevere Thunderstorm WarningDTXLivingston37 min
Jul 21, 5:33 PM EDTSevere Thunderstorm WarningDTXWashtenaw57 min
Jul 21, 5:38 PM EDTSevere Thunderstorm WarningDTXLenawee57 min
Jul 21, 5:48 PM EDTSevere Thunderstorm WarningDTXOakland42 min
Jul 21, 5:56 PM EDTSevere Thunderstorm WarningDTXMonroe, Wayne64 min
Jul 21, 5:56 PM EDTSevere Thunderstorm WarningDTXMacomb64 min
Jul 21, 6:39 PM EDTSevere Thunderstorm WarningDTXSaint Clair31 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; radar from the NEXRAD Level II archive.