Alert archive / Michigan / Severe Thunderstorm Warnings in 1991
Severe Thunderstorm Warning 29, NWS Grand Rapids, MI
NWS Grand Rapids, MI issued this severe thunderstorm warning at Jul 7, 1991, 6:24 PM EDT for Allegan County, Ottawa County, Michigan. It was in force for 36 min. 4 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jul 7, 1991, 6:24 PM EDT (22:24 UTC)
- Expired
- Jul 7, 1991, 7:00 PM EDT
- In force
- 36 min
- Issued by
- NWS Grand Rapids, MI
- Area
- Whole counties
Counties Allegan County, MI, Ottawa County, MI
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 7, 6:30 PM EDT | Tornado F0 | Allegan, MI | |
| Jul 7, 6:40 PM EDT | Thunderstorm Wind 52 | Ottawa, MI | |
| Jul 7, 6:41 PM EDT | Thunderstorm Wind 57 | Ottawa, MI | |
| Jul 7, 7:00 PM EDT | Thunderstorm Wind 57 | Ottawa, MI |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Detroit, MI (KFNT), launched 12:00Z, 10.4 hours before the alert went out and 214 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
- 1038 J/kg
- Mixed-layer CIN
- -84 J/kg
- Mixed-layer LCL
- 1127 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 35 m²/s²
- 0-3 km storm-relative helicity
- 126 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.3
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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.
In the hours before
Special weather statement, Jul 7, 1:05 PM EDT, 5 hours 19 minutes before
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</html>Special weather statement, Jul 7, 1:49 PM EDT, 4 hours 35 minutes before
MIZ013-004-016-015-003-010-009-002-071850- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GRAND RAPIDS MI 148 PM EDT THU JUL 4 1991 ...INTENSE THUNDERSTORMS OVER SOUTHWEST LOWER MICHIGAN... AT 140 PM EDT...WEATHER RADAR SHOWED AN INTENSE THUNDERSTORM OVER THE CITY OF HOLLAND...25 MILES WEST SOUTHWEST OF GRAND RAPIDS. OTHER STRONG THUNDERSTORMS WERE NEAR GREEN LAKE AND THE CITY OF PARCHMENT. THE STROMS WERE MOVING TO THE EAST AT 40 MPH. THE STORM OVER HOLLAND WILL REACH THE NORTH DORR AREA BY 215 PM EDT. PERSONS IN SOUTHWEST LOWER MICHIGAN SHOULD BE PREPARED FOR BRIEF HEAVY RAIN...SMALL HAIL...STRONG GUSTY WINDS...AND DANGEROUS CLOUD TO GROUND LIGHTNING. IF YOU ARE OUTDOORS...MOVE INCDOORS BEFORE THE THUNDERSTORMS APPROACH YOUR AREA. MJK
Special weather statement, Jul 7, 5:49 PM EDT, 35 minutes before
MIZ013-004-016-015-003-010-009-002-072245- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GRAND RAPIDS MI 548 PM EDT THU JUL 4 1991 ...TORNADO WATCH IN EFFECT UNTIL 1100 PM EDT... ...STRONG THUNDERSTORMS APPROACHING THE EAST SHORE OF LAKE MICHIGAN... AT 543 PM EDT...WEATHER RADAR SHOWED A LINE OF STRONG THUNDERSTORMS APPROACHING THE EAST SHORE OF LAKE MICHIGAN. THE LINE WAS JUST OFFSHORE GRAND HAVEN...TO 15 MILES WEST OF ST. JOSEPH. THE LINE WAS MOVING TO THE EAST AT 50 MPH AND WILL REACH THE CITIES OF COOPERSVILLE AND PAW PAW BY 615 PM EDT. THESE STORMS HAVE A HISTORY OF PRODUCING VERY STRONG WINDS...HAIL...AND TORNADOES. PERSONS IN SOUTHWEST LOWER MICHIGAN SHOULD BE ON THE LOOKOUT FOR POSSIBLE SEVERE WEATHER. IF SEVERE WEATHER IS SIGHTED IN YOUR AREA... TAKE COVER IMMEDIATELY. AFTER THE WEATHER HAS PASSED...NOTIFY YOUR NEAREST LAW ENFORCEMENT AGENCY. MJK
The office that day
Everything else NWS Grand Rapids, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 9:46 PM EDT | Severe Thunderstorm Warning | GRR | Kent, Ottawa | 44 min |
| Jul 6, 9:58 PM EDT | Severe Thunderstorm Warning | GRR | Van Buren | 47 min |
| Jul 6, 10:09 PM EDT | Severe Thunderstorm Warning | GRR | Ionia | 51 min |
| Jul 6, 10:23 PM EDT | Severe Thunderstorm Warning | GRR | Allegan | 52 min |
| Jul 6, 10:29 PM EDT | Severe Thunderstorm Warning | GRR | Kent | 46 min |
| Jul 6, 10:32 PM EDT | Severe Thunderstorm Warning | GRR | Clinton | 58 min |
| Jul 6, 11:36 PM EDT | Severe Thunderstorm Warning | GRR | Clinton | 39 min |
| Jul 7, 6:42 PM EDT | Severe Thunderstorm Warning | GRR | Kent | 33 min |
| Jul 7, 6:57 PM EDT | Severe Thunderstorm Warning | GRR | Ionia, Montcalm | 48 min |
| Jul 7, 7:02 PM EDT | Tornado Warning | GRR | Ottawa | 28 min |
| Jul 7, 7:09 PM EDT | Tornado Warning | GRR | Allegan, Van Buren | 36 min |
| Jul 7, 7:16 PM EDT | Severe Thunderstorm Warning | GRR | Barry, Kent | 29 min |
| Jul 7, 7:22 PM EDT | Severe Thunderstorm Warning | GRR | Eaton | 68 min |
| Jul 7, 7:29 PM EDT | Severe Thunderstorm Warning | GRR | Calhoun | 61 min |
| Jul 7, 7:30 PM EDT | Severe Thunderstorm Warning | GRR | Kalamazoo | 30 min |
| Jul 7, 7:47 PM EDT | Severe Thunderstorm Warning | GRR | Clinton, Gratiot, Ingham | 43 min |
Nearby
Severe Thunderstorm Warnings in Michigan, 1991Every severe thunderstorm warning in 1991
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.