Alert archive / Michigan / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 662

August 8, 20019 counties in Michigan; Florence County, Wisconsin

The Storm Prediction Center issued this severe thunderstorm watch at Aug 8, 2001, 9:45 AM EDT for 9 counties in Michigan; Florence County, Wisconsin. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Aug 8, 2001, 9:45 AM EDT (13:45 UTC)
Expired
Aug 8, 2001, 2:00 PM EDT
In force
4 hr
Issued by
the Storm Prediction Center

Counties Alger County, MI, Baraga County, MI, Chippewa County, MI, Delta County, MI, Dickinson County, MI, Luce County, MI, Mackinac County, MI, Marquette County, MI, Schoolcraft County, MI, Florence County, WI

The radar

The Marquette radar (KMQT), 81 km from the middle of the area, began a volume at 13:45 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

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

IssuedProductOfficeCountiesLasted
Aug 8, 10:34 AM EDTSevere Thunderstorm WarningMQTAlger56 min
Aug 8, 11:18 AM EDTSevere Thunderstorm WarningMQTLuce, Schoolcraft57 min
Aug 8, 11:35 AM EDTSevere Thunderstorm WarningAPXMackinac70 min
Aug 8, 12:04 PM EDTSevere Thunderstorm WarningAPXChippewa71 min
Aug 8, 12:35 PM EDTSevere Thunderstorm WarningAPXMackinac40 min

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 1.8 hours before the alert went out and 272 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 2001-08-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2259 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 2001-08-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 40 square meters per square second.1939Sfc1 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
2259 J/kg
Mixed-layer CIN
-148 J/kg
Mixed-layer LCL
1129 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
40 m²/s²
0-3 km storm-relative helicity
3 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.

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 8, 5:30 AM EDTSevere Thunderstorm WatchSPCGogebic, Houghton, Iron, Ontonagon6 hr
Aug 8, 5:00 PM EDTSevere Thunderstorm WatchSPCAshland, Bayfield, Burnett, Douglas, Price, Sawyer and 1 more6 hr

Nearby

Severe Thunderstorm Watches in Michigan, 2001Severe Thunderstorm Watches in Wisconsin, 2001Every severe thunderstorm watch in 2001

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.