Alert archive / Michigan / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 60, NWS Grand Rapids, MI
NWS Grand Rapids, MI issued this severe thunderstorm warning at Aug 22, 2002, 12:06 AM EDT for Allegan County, Van Buren County, Michigan. It was in force for 54 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 22, 2002, 12:06 AM EDT (04:06 UTC)
- Expired
- Aug 22, 2002, 1:00 AM EDT
- In force
- 54 min
- Issued by
- NWS Grand Rapids, MI
- Area
- Counties, with a storm outline in the text
Counties Allegan County, MI, Van Buren County, MI
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
Detroit, MI (KDTX), launched 00:00Z, 4.1 hours before the alert went out and 222 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
- 1935 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 96 m²/s²
- 0-3 km storm-relative helicity
- 139 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Grand Rapids, MI wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 21, 9:42 PM EDT, 2 hours 24 minutes earlier.
Area forecast discussion, Aug 21, 9:42 PM EDT, 2 hours 24 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAND RAPIDS MI 942 PM EDT WED AUG 21 2002 SURFACE LOW IS LOCATED NEAR LACROSSE WISCONSIN THIS EVENING...WITH A WARM FRONTAL BOUNDARY EXTENDING EAST INTO NORTHERN LOWER MICHIGAN (NORTH OF THE GRR CWA). WARM SOUTHERLY FLOW IS IN PLACE ACROSS SOUTHWEST LOWER MICHIGAN...WITH DEW POINTS IN THE 70S ALONG THE LAKE MICHIGAN COASTLINE. THE MOISTURE DECREASES ACROSS THE EASTERN CWA...BUT THE CONVECTION SHOULD ATLEAST HOLD ITS OWN ACROSS LAKE MICHIGAN INTO WESTERN LOWER. SITES IN EASTERN WISCONSIN HAVE GUSTED TO NEAR 50 KNOTS IN THE LAST HOUR (ETB TO 41KTS AND UES TO 49KTS). GIVEN AN INCREASING LOW LEVEL JET OVERHEAD...TO NEAR 50 KNOTS BY 06Z...DAMAGING WIND GUSTS ARE THE PRIMARY THREAT WITH THIS CONVECTION AS IT MOVES EAST ACROSS THE LAKE. WILL CARRY CATEGORICAL WORDING IN THE NORTH AND WEST...AND LEAVE THE CHANCE IN THE FAR SOUTHEAST AS THE PRECIPITATION WILL BE MOVING INTO A MUCH LESS FAVORABLE AIRMASS THERE. LOWS AND WINDS LOOK FINE IN THE GOING FORECAST. HEAVY RAIN IS ALSO A THREAT WITH THE LOW LEVEL JET POSITIONED OVERHEAD THROUGH THE NIGHT. REDEVELOPMENT IS ALREADY OCCURRING TO THE WEST OF THE LINE OF STORMS COMING OUT OVER LAKE MICHIGAN. ZONES TO FOLLOW SHORTLY. SPECIAL MARINE WARNING JUST ISSUED FOR GRAND HAVEN NORTHWARD TO MANISTEE. .GRR...NONE. DUKESHERER
The office that day
Everything else NWS Grand Rapids, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 9:40 PM EDT | Special Marine Warning | GRR | 2 hr | |
| Aug 21, 9:40 PM EDT | Special Marine Warning | GRR | 2 hr | |
| Aug 21, 9:40 PM EDT | Special Marine Warning | GRR | 2 hr | |
| Aug 21, 10:27 PM EDT | Special Marine Warning | GRR | 93 min | |
| Aug 21, 10:27 PM EDT | Special Marine Warning | GRR | 93 min | |
| Aug 21, 11:10 PM EDT | Severe Thunderstorm Warning | GRR | Muskegon, Ottawa | 50 min |
| Aug 21, 11:58 PM EDT | Special Marine Warning | GRR | 47 min | |
| Aug 21, 11:58 PM EDT | Special Marine Warning | GRR | 47 min |
Nearby
Severe Thunderstorm Warnings in Michigan, 2002Every severe thunderstorm warning in 2002
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.