Alert archive / Michigan / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 558

July 31, 200214 counties in Michigan; Door County, Wisconsin

The Storm Prediction Center issued this severe thunderstorm watch at Jul 31, 2002, 4:00 PM EDT for 14 counties in Michigan; Door County, Wisconsin. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jul 31, 2002, 4:00 PM EDT (20:00 UTC)
Expired
Jul 31, 2002, 9:00 PM EDT
In force
5 hr
Issued by
the Storm Prediction Center

Counties Alger County, MI, Antrim County, MI, Charlevoix County, MI, Cheboygan County, MI, Chippewa County, MI, Delta County, MI, Emmet County, MI, Leelanau County, MI, Luce County, MI, Mackinac County, MI, Menominee County, MI, Montmorency County, MI, Otsego County, MI, Schoolcraft County, MI, Door County, WI

The radar

The Marquette radar (KMQT), 123 km from the middle of the area, began a volume at 20:01 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.

Warnings issued inside it

4 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jul 31, 4:27 PM EDTSevere Thunderstorm WarningMQTAlger78 min
Jul 31, 5:01 PM EDTSevere Thunderstorm WarningMQTSchoolcraft74 min
Jul 31, 5:35 PM EDTSevere Thunderstorm WarningMQTLuce70 min
Jul 31, 5:36 PM EDTSevere Thunderstorm WarningAPXMackinac84 min

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 8.0 hours before the alert went out and 222 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 12:00Z on 2002-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1182 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 12:00Z on 2002-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 147 square meters per square second.193958Sfc1 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
1182 J/kg
Mixed-layer CIN
-205 J/kg
Mixed-layer LCL
1280 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
147 m²/s²
0-3 km storm-relative helicity
174 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

Nearby

Severe Thunderstorm Watches in Michigan, 2002Severe Thunderstorm Watches in Wisconsin, 2002Every severe thunderstorm watch in 2002

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; radar from the NEXRAD Level II archive.