Alert archive / Michigan / Severe Thunderstorm Watches in 2001
Severe Thunderstorm Watch 668
The Storm Prediction Center issued this severe thunderstorm watch at Aug 9, 2001, 4:45 PM EDT for 37 counties in Michigan. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 9, 2001, 4:45 PM EDT (20:45 UTC)
- Expired
- Aug 9, 2001, 11:00 PM EDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 37 counties
Alcona County, MI, Allegan County, MI, Alpena County, MI, Arenac County, MI, Barry County, MI, Bay County, MI, Clare County, MI, Clinton County, MI, Eaton County, MI, Genesee County, MI, Gladwin County, MI, Gratiot County, MI, Huron County, MI, Ionia County, MI, Iosco County, MI, Isabella County, MI, Kent County, MI, Lake County, MI, Lapeer County, MI, Mason County, MI, Mecosta County, MI, Midland County, MI, Missaukee County, MI, Montcalm County, MI, Muskegon County, MI, Newaygo County, MI, Oceana County, MI, Ogemaw County, MI, Osceola County, MI, Oscoda County, MI, Ottawa County, MI, Roscommon County, MI, Saginaw County, MI, Shiawassee County, MI, Tuscola County, MI, Van Buren County, MI, Wexford County, MI
Warnings issued inside it
9 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 5:05 PM EDT | Severe Thunderstorm Warning | APX | Wexford | 40 min |
| Aug 9, 5:15 PM EDT | Severe Thunderstorm Warning | GRR | Lake, Mason | 60 min |
| Aug 9, 5:48 PM EDT | Severe Thunderstorm Warning | APX | Oscoda | 42 min |
| Aug 9, 6:20 PM EDT | Severe Thunderstorm Warning | APX | Ogemaw, Roscommon | 70 min |
| Aug 9, 6:30 PM EDT | Severe Thunderstorm Warning | APX | Gladwin | 60 min |
| Aug 9, 6:45 PM EDT | Severe Thunderstorm Warning | APX | Iosco | 45 min |
| Aug 9, 6:52 PM EDT | Severe Thunderstorm Warning | DTX | Midland | 38 min |
| Aug 9, 6:55 PM EDT | Severe Thunderstorm Warning | APX | Arenac | 65 min |
| Aug 9, 7:23 PM EDT | Severe Thunderstorm Warning | GRR | Kent, Montcalm | 67 min |
The nearest sounding before it
Detroit, MI (KDTX), launched 12:00Z, 8.8 hours before the alert went out and 178 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.
- Mixed-layer CAPE
- 1074 J/kg
- Mixed-layer CIN
- -57 J/kg
- Mixed-layer LCL
- 1070 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 34 m²/s²
- 0-3 km storm-relative helicity
- 35 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.6
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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 1:45 PM EDT | Severe Thunderstorm Watch | SPC | Antrim, Benzie, Charlevoix, Cheboygan, Chippewa, Crawford and 13 more | 7 hr |
| Aug 9, 5:30 PM EDT | Severe Thunderstorm Watch | SPC | Mason, Oceana | 5 hr |
Nearby
Severe Thunderstorm Watches in Michigan, 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.