Alert archive / Michigan / Special Weather Statements in 2021
Special Weather Statement, NWS Grand Rapids, MI
NWS Grand Rapids, MI issued this special weather statement at Aug 8, 2021, 12:09 AM EDT for 4 counties in Michigan. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 8, 2021, 12:09 AM EDT (04:09 UTC)
- Expired
- Aug 8, 2021, 2:15 AM EDT
- In force
- 2 hr
- Issued by
- NWS Grand Rapids, MI
- Hail
- 0.25 in
- Wind
- 40
Counties Kent County, MI, Mecosta County, MI, Montcalm County, MI, Newaygo County, MI
The radar
The Grand Rapids radar (KGRR), 63 km from the middle of the area, began a volume at 04:09 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 nearest sounding before it
Detroit, MI (KDTX), launched 00:00Z, 4.2 hours before the alert went out and 186 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
- 519 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 1029 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 57 m²/s²
- 0-3 km storm-relative helicity
- 39 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
776
WWUS83 KGRR 080409
SPSGRR
Special Weather Statement
National Weather Service Grand Rapids MI
1209 AM EDT Sun Aug 8 2021
MIZ044-045-051-057-058-080615-
Montcalm MI-Ionia MI-Mecosta MI-Newaygo MI-Kent MI-
1209 AM EDT Sun Aug 8 2021
...Strong thunderstorms will impact portions of northern Kent,
Newaygo, northern Ionia, Mecosta and Montcalm Counties through 215 AM
EDT...
At 1209 AM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Shelby to 9 miles northeast of Muskegon to
8 miles southwest of Grand Haven. Movement was east at 35 mph.
HAZARD...Winds in excess of 40 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
Locations impacted include...
Grand Rapids, Big Rapids, Greenville, Belding, Newaygo, Stanton,
White Cloud, Walker, Rockford, Sparta, Fremont, Howard City, Edmore,
Carson City, Lakeview, Hesperia, Grant, Morley, Mecosta and Canadian
Lakes.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4371 8604 4382 8536 4381 8509 4347 8508
4346 8484 4307 8484 4297 8578 4329 8579
4330 8604
TIME...MOT...LOC 0409Z 259DEG 31KT 4360 8640 4330 8609 4298 8636
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH
$$
NJJThe office that day
Everything else NWS Grand Rapids, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 11:20 PM EDT | Special Marine Warning | GRR | 55 min | |
| Aug 7, 11:37 PM EDT | Special Weather Statement | GRR | Muskegon, Oceana, Ottawa | 83 min |
| Aug 8, 12:55 AM EDT | Special Marine Warning | GRR | 110 min | |
| Aug 8, 4:05 AM EDT | Beach Hazards Statement | GRR | Mason, Muskegon, Oceana, Ottawa | 22 hr |
Nearby
Special Weather Statements in Michigan, 2021Every special weather statement 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.