Alert archive / Michigan / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 759
The Storm Prediction Center issued this severe thunderstorm watch at Aug 18, 2004, 5:30 PM EDT for 29 counties in Michigan. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 18, 2004, 5:30 PM EDT (21:30 UTC)
- Expired
- Aug 18, 2004, 11:00 PM EDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 29 counties
Alcona County, MI, Alpena County, MI, Antrim County, MI, Arenac County, MI, Benzie County, MI, Charlevoix County, MI, Cheboygan County, MI, Chippewa County, MI, Clare County, MI, Crawford County, MI, Emmet County, MI, Gladwin County, MI, Grand Traverse County, MI, Iosco County, MI, Kalkaska County, MI, Lake County, MI, Leelanau County, MI, Mackinac County, MI, Manistee County, MI, Mason County, MI, Missaukee County, MI, Montmorency County, MI, Ogemaw County, MI, Osceola County, MI, Oscoda County, MI, Otsego County, MI, Presque Isle County, MI, Roscommon County, MI, Wexford County, MI
The radar
The NCL Michigan radar (KAPX), 33 km from the middle of the area, began a volume at 21:33 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
2 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 5:48 PM EDT | Severe Thunderstorm Warning | APX | Leelanau | 42 min |
| Aug 18, 8:59 PM EDT | Severe Thunderstorm Warning | APX | Alpena | 46 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, 9.5 hours before the alert went out and 238 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 993 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 72 m²/s²
- 0-3 km storm-relative helicity
- 131 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 8:48 PM EDT | Mesoscale Discussion | SPC | Berrien, Branch, Calhoun, Cass, Hillsdale, Jackson and 8 more | 117 min |
| Aug 18, 1:27 PM EDT | Mesoscale Discussion | SPC | Alger, Baraga, Delta, Dickinson, Gogebic, Houghton and 6 more | 63 min |
| Aug 18, 2:10 PM EDT | Severe Thunderstorm Watch | SPC | Alger, Baraga, Delta, Dickinson, Gogebic, Iron and 5 more | 7 hr |
| Aug 18, 4:03 PM EDT | Mesoscale Discussion | SPC | Monroe, Wayne | 57 min |
| Aug 18, 4:46 PM EDT | Mesoscale Discussion | SPC | Alger, Antrim, Benzie, Charlevoix, Cheboygan, Chippewa and 19 more | 59 min |
| Aug 18, 6:52 PM EDT | Mesoscale Discussion | SPC | Luce | 113 min |
| Aug 18, 7:41 PM EDT | Mesoscale Discussion | SPC | Alcona, Alpena, Antrim, Arenac, Bay, Cheboygan and 23 more | 94 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.