Alert archive / Michigan / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 726
The Storm Prediction Center issued this severe thunderstorm watch at Aug 9, 2004, 7:50 PM EDT for 44 counties in Michigan. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 9, 2004, 7:50 PM EDT (23:50 UTC)
- Expired
- Aug 10, 2004, 1:00 AM EDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 44 counties
Alcona County, MI, Allegan County, MI, Alpena County, MI, Antrim County, MI, Arenac County, MI, Barry County, MI, Bay County, MI, Calhoun County, MI, Charlevoix County, MI, Cheboygan County, MI, Clare County, MI, Clinton County, MI, Crawford County, MI, Eaton County, MI, Emmet County, MI, Gladwin County, MI, Grand Traverse County, MI, Gratiot County, MI, Ingham County, MI, Ionia County, MI, Iosco County, MI, Isabella County, MI, Jackson County, MI, Kalamazoo County, MI, Kalkaska County, MI, Kent County, MI, Lake County, MI, Mecosta County, MI, Midland County, MI, Missaukee County, MI, Montcalm County, MI, Montmorency County, MI, Newaygo County, MI, Ogemaw County, MI, Osceola County, MI, Oscoda County, MI, Otsego County, MI, Ottawa County, MI, Presque Isle County, MI, Roscommon County, MI, Saginaw County, MI, Shiawassee County, MI, Van Buren County, MI, Wexford County, MI
The radar
The Grand Rapids radar (KGRR), 76 km from the middle of the area, began a volume at 23:49 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
12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 8:06 PM EDT | Severe Thunderstorm Warning | GRR | Kent | 54 min |
| Aug 9, 8:14 PM EDT | Severe Thunderstorm Warning | APX | Charlevoix | 31 min |
| Aug 9, 8:23 PM EDT | Severe Thunderstorm Warning | GRR | Montcalm | 52 min |
| Aug 9, 8:29 PM EDT | Severe Thunderstorm Warning | GRR | Allegan, Van Buren | 46 min |
| Aug 9, 8:52 PM EDT | Severe Thunderstorm Warning | APX | Antrim, Charlevoix | 68 min |
| Aug 9, 9:08 PM EDT | Severe Thunderstorm Warning | GRR | Gratiot | 52 min |
| Aug 9, 9:41 PM EDT | Severe Thunderstorm Warning | GRR | Calhoun | 49 min |
| Aug 9, 9:42 PM EDT | Severe Thunderstorm Warning | DTX | Saginaw | 78 min |
| Aug 9, 10:00 PM EDT | Severe Thunderstorm Warning | APX | Antrim | 45 min |
| Aug 9, 10:02 PM EDT | Severe Thunderstorm Warning | APX | Charlevoix | 28 min |
| Aug 9, 10:08 PM EDT | Severe Thunderstorm Warning | APX | Charlevoix | 22 min |
| Aug 9, 10:12 PM EDT | Severe Thunderstorm Warning | APX | Otsego | 63 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Green Bay/Straub, WI (KGRB), launched 12:00Z, 11.8 hours before the alert went out and 253 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
- 1021 J/kg
- Mixed-layer CIN
- -47 J/kg
- Mixed-layer LCL
- 718 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 116 m²/s²
- 0-3 km storm-relative helicity
- 138 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.8
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 11:53 AM EDT | Mesoscale Discussion | SPC | Baraga, Dickinson, Iron, Marquette, Menominee | 97 min |
| Aug 9, 1:05 PM EDT | Severe Thunderstorm Watch | SPC | Alger, Baraga, Charlevoix, Delta, Dickinson, Emmet and 7 more | 6 hr |
| Aug 9, 4:32 PM EDT | Mesoscale Discussion | SPC | Alger, Baraga, Charlevoix, Delta, Dickinson, Emmet and 7 more | 88 min |
Nearby
Severe Thunderstorm Watches in Michigan, 2004Every severe thunderstorm watch in 2004
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.