Alert archive / Michigan / Tornado Watches in 1998
Tornado Watch 661
The Storm Prediction Center issued this tornado watch at Jun 24, 1998, 10:30 PM EDT for 21 counties in Michigan. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 24, 1998, 10:30 PM EDT (02:30 UTC)
- Expired
- Jun 25, 1998, 3:00 AM EDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 21 counties
Alcona County, MI, Alpena County, MI, Antrim County, MI, Arenac County, MI, Bay County, MI, Cheboygan County, MI, Crawford County, MI, Emmet County, MI, Gladwin County, MI, Grand Traverse County, MI, Huron County, MI, Iosco County, MI, Kalkaska County, MI, Missaukee County, MI, Montmorency County, MI, Ogemaw County, MI, Oscoda County, MI, Otsego County, MI, Roscommon County, MI, Sanilac County, MI, Tuscola County, MI
Warnings issued inside it
3 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 24, 10:42 PM EDT | Severe Thunderstorm Warning | APX | Crawford | 63 min |
| Jun 24, 11:11 PM EDT | Tornado Warning | APX | Crawford | 49 min |
| Jun 24, 11:25 PM EDT | Severe Thunderstorm Warning | APX | Oscoda | 65 min |
The nearest sounding before it
Alpena, MI (KAPX), launched 00:00Z, 2.5 hours before the alert went out and 142 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
- 1646 J/kg
- Mixed-layer CIN
- -44 J/kg
- Mixed-layer LCL
- 985 m above ground
- 0-6 km bulk shear
- 57 kt
- 0-1 km storm-relative helicity
- 241 m²/s²
- 0-3 km storm-relative helicity
- 340 m²/s²
- Significant tornado parameter
- 3.7
- Supercell composite
- 15.6
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 |
|---|---|---|---|---|
| Jun 25, 3:00 PM EDT | Severe Thunderstorm Watch | SPC | Delta, Dickinson, Iron, Menominee | 6 hr |
| Jun 25, 6:30 PM EDT | Tornado Watch | SPC | Alcona, Alpena, Antrim, Benzie, Charlevoix, Cheboygan and 19 more | 7 hr |
Nearby
Tornado Watches in Michigan, 1998Every tornado watch in 1998
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.