Alert archive / Michigan / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 620
The Storm Prediction Center issued this severe thunderstorm watch at Jul 13, 2004, 11:55 AM EDT for 14 counties in Michigan; 11 counties in Wisconsin. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 13, 2004, 11:55 AM EDT (15:55 UTC)
- Expired
- Jul 13, 2004, 6:00 PM EDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 25 counties
Antrim County, MI, Benzie County, MI, Charlevoix County, MI, Cheboygan County, MI, Chippewa County, MI, Delta County, MI, Dickinson County, MI, Emmet County, MI, Grand Traverse County, MI, Leelanau County, MI, Mackinac County, MI, Manistee County, MI, Menominee County, MI, Schoolcraft County, MI, Brown County, WI, Door County, WI, Kewaunee County, WI, Manitowoc County, WI, Marinette County, WI, Menominee County, WI, Oconto County, WI, Outagamie County, WI, Portage County, WI, Shawano County, WI, Waupaca County, WI
The radar
The Green Bay radar (KGRB), 83 km from the middle of the area, began a volume at 15:59 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
13 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 13, 1:35 PM EDT | Severe Thunderstorm Warning | MQT | Delta, Menominee | 55 min |
| Jul 13, 3:11 PM EDT | Severe Thunderstorm Warning | GRB | Portage, Waushara | 49 min |
| Jul 13, 3:15 PM EDT | Severe Thunderstorm Warning | GRB | Outagamie | 60 min |
| Jul 13, 3:25 PM EDT | Severe Thunderstorm Warning | GRB | Marinette, Oconto | 65 min |
| Jul 13, 3:35 PM EDT | Severe Thunderstorm Warning | MQT | Dickinson, Iron | 40 min |
| Jul 13, 3:44 PM EDT | Severe Thunderstorm Warning | GRB | Door, Kewaunee | 46 min |
| Jul 13, 3:50 PM EDT | Severe Thunderstorm Warning | MQT | Menominee | 55 min |
| Jul 13, 3:56 PM EDT | Severe Thunderstorm Warning | GRB | Brown | 49 min |
| Jul 13, 4:07 PM EDT | Severe Thunderstorm Warning | GRB | Calumet, Manitowoc | 53 min |
| Jul 13, 4:41 PM EDT | Severe Thunderstorm Warning | GRB | Marinette, Oconto | 49 min |
| Jul 13, 4:49 PM EDT | Tornado Warning | GRB | Manitowoc | 41 min |
| Jul 13, 5:12 PM EDT | Severe Thunderstorm Warning | GRB | Door | 48 min |
| Jul 13, 5:36 PM EDT | Severe Thunderstorm Warning | APX | Emmet | 39 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, 3.9 hours before the alert went out and 84 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
- 1324 J/kg
- Mixed-layer CIN
- -100 J/kg
- Mixed-layer LCL
- 841 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 46 m²/s²
- 0-3 km storm-relative helicity
- 100 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 13, 11:08 AM EDT | Mesoscale Discussion | SPC | Alger, Alpena, Antrim, Benzie, Charlevoix, Cheboygan and 18 more | 2 hr |
| Jul 13, 3:10 PM EDT | Mesoscale Discussion | SPC | Antrim, Benzie, Charlevoix, Cheboygan, Chippewa, Delta and 8 more | 2 hr |
| Jul 13, 4:05 PM EDT | Severe Thunderstorm Watch | SPC | Alcona, Alpena, Antrim, Arenac, Barry, Bay and 44 more | 8 hr |
| Jul 13, 7:08 PM EDT | Mesoscale Discussion | SPC | Barry, Bay, Calhoun, Clare, Clinton, Eaton and 21 more | 2 hr |
| Jul 13, 2:20 AM EDT | Severe Thunderstorm Watch | SPC | Ashland, Barron, Bayfield, Burnett, Douglas, Iron and 5 more | 6 hr |
| Jul 13, 4:35 AM EDT | Mesoscale Discussion | SPC | Barron, Burnett, Polk, Saint Croix, Washburn | 55 min |
| Jul 13, 2:19 PM EDT | Mesoscale Discussion | SPC | Adams, Calumet, Columbia, Crawford, Dane, Dodge and 21 more | 116 min |
Nearby
Severe Thunderstorm Watches in Michigan, 2004Severe Thunderstorm Watches in Wisconsin, 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.