Alert archive / Michigan / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 34, NWS Grand Rapids, MI
NWS Grand Rapids, MI issued this severe thunderstorm warning at Jul 24, 2021, 4:38 PM EDT for Gratiot County, Michigan. It was in force for 52 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 24, 2021, 4:38 PM EDT (20:38 UTC)
- Expired
- Jul 24, 2021, 5:30 PM EDT
- In force
- 52 min
- Issued by
- NWS Grand Rapids, MI
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Gratiot County, MI
The radar
The Grand Rapids radar (KGRR), 87 km from the middle of the area, began a volume at 20:42 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 24, 3:16 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Detroit, MI (KDTX), launched 12:00Z, 8.6 hours before the alert went out and 108 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
- 588 J/kg
- Mixed-layer CIN
- -27 J/kg
- Mixed-layer LCL
- 557 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 113 m²/s²
- 0-3 km storm-relative helicity
- 129 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.8
The text
As transmitted.
518
WUUS53 KGRR 242038
SVRGRR
MIC057-242130-
/O.NEW.KGRR.SV.W.0034.210724T2038Z-210724T2130Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Rapids MI
438 PM EDT Sat Jul 24 2021
The National Weather Service in Grand Rapids has issued a
* Severe Thunderstorm Warning for...
Southern Gratiot County in central Michigan...
* Until 530 PM EDT.
* At 438 PM EDT, a severe thunderstorm was located 7 miles west of
Ithaca, moving east at 35 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Ithaca... Sumner... North Star...
Ashley... Perrinton... Pompeii...
Bannister...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4312 8454 4325 8482 4337 8481 4332 8437
4312 8437
TIME...MOT...LOC 2038Z 286DEG 29KT 4328 8475
TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
$$
CAS3 follow-up statements
446
WWUS53 KGRR 242053
SVSGRR
Severe Weather Statement
National Weather Service Grand Rapids MI
453 PM EDT Sat Jul 24 2021
MIC057-242130-
/O.CON.KGRR.SV.W.0034.000000T0000Z-210724T2130Z/
Gratiot MI-
453 PM EDT Sat Jul 24 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR SOUTHEASTERN GRATIOT COUNTY...
At 453 PM EDT, a severe thunderstorm was located near Ithaca, moving
east at 35 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Ithaca... North Star... Ashley...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4321 8459 4328 8466 4333 8461 4332 8437
4312 8437
TIME...MOT...LOC 2052Z 281DEG 31KT 4327 8457
TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
$$
CAS806 WWUS53 KGRR 242109 SVSGRR Severe Weather Statement National Weather Service Grand Rapids MI 509 PM EDT Sat Jul 24 2021 MIC057-242130- /O.CON.KGRR.SV.W.0034.000000T0000Z-210724T2130Z/ Gratiot MI- 509 PM EDT Sat Jul 24 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT FOR SOUTHEASTERN GRATIOT COUNTY... At 509 PM EDT, a severe thunderstorm was located near Ashley, or 9 miles southeast of Ithaca, moving east at 30 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Ashley... PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain alert for a possible tornado! Tornadoes can develop quickly from severe thunderstorms. If you spot a tornado go at once into the basement or small central room in a sturdy structure. For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4320 8454 4329 8449 4331 8437 4316 8437 TIME...MOT...LOC 2109Z 289DEG 26KT 4323 8444 TORNADO...POSSIBLE HAIL...<.75IN WIND...60MPH $$ CAS
706
WWUS53 KGRR 242129
SVSGRR
Severe Weather Statement
National Weather Service Grand Rapids MI
529 PM EDT Sat Jul 24 2021
MIC057-242137-
/O.EXP.KGRR.SV.W.0034.000000T0000Z-210724T2130Z/
Gratiot MI-
529 PM EDT Sat Jul 24 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN GRATIOT COUNTY
WILL EXPIRE AT 530 PM EDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.
A Severe Thunderstorm Watch remains in effect until 1000 PM EDT for
central Michigan.
LAT...LON 4320 8454 4329 8449 4331 8437 4316 8437
TIME...MOT...LOC 2127Z 286DEG 29KT 4319 8426
$$
CASThe office that day
Everything else NWS Grand Rapids, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 24, 12:30 PM EDT | Special Weather Statement | GRR | Clare, Lake, Osceola | 60 min |
| Jul 24, 2:58 PM EDT | Severe Thunderstorm Warning | GRR | Clare | 32 min |
| Jul 24, 5:50 PM EDT | Severe Thunderstorm Warning | GRR | Allegan, Barry, Kent, Ottawa | 55 min |
| Jul 24, 6:58 PM EDT | Severe Thunderstorm Warning | GRR | Clinton, Eaton, Ingham | 62 min |
| Jul 24, 7:17 PM EDT | Severe Thunderstorm Warning | GRR | Eaton, Ingham | 43 min |
Nearby
Severe Thunderstorm Warnings in Michigan, 2021Every severe thunderstorm warning in 2021
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.