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 7, 2021, 11:37 PM EDT for Muskegon County, Oceana County, Ottawa County, Michigan. It was in force for 83 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
- Aug 7, 2021, 11:37 PM EDT (03:37 UTC)
- Expired
- Aug 8, 2021, 1:00 AM EDT
- In force
- 83 min
- Issued by
- NWS Grand Rapids, MI
- Hail
- 0.00 in
- Wind
- 40
Counties Muskegon County, MI, Oceana County, MI, Ottawa County, MI
The radar
The Grand Rapids radar (KGRR), 62 km from the middle of the area, began a volume at 03:39 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
Green Bay/Straub, WI (KGRB), launched 00:00Z, 3.6 hours before the alert went out and 209 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
- 22 J/kg
- Mixed-layer CIN
- -122 J/kg
- Mixed-layer LCL
- 1055 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 106 m²/s²
- 0-3 km storm-relative helicity
- 275 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
411
WWUS83 KGRR 080337
SPSGRR
Special Weather Statement
National Weather Service Grand Rapids MI
1137 PM EDT Sat Aug 7 2021
MIZ043-050-056-080500-
Oceana MI-Muskegon MI-Ottawa MI-
1137 PM EDT Sat Aug 7 2021
...Strong thunderstorms will impact portions of Ottawa, Muskegon and
Oceana Counties through 100 AM EDT...
At 1136 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from 7 miles southwest of Shelby to 13 miles
southwest of Grand Haven. Movement was east at 30 mph.
HAZARD...Winds in excess of 40 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Muskegon, Holland, Grand Haven, Hart, Walker, Shelby, Muskegon
Heights, Hudsonville, Zeeland, Coopersville, Roosevelt Park, North
Muskegon, Ferrysburg, Whitehall, Montague, Spring Lake, Lakewood
Club, Ravenna, Fruitport and Hesperia.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
Persons in campgrounds should consider seeking sturdy shelter until
these storms pass.
&&
LAT...LON 4382 8643 4382 8604 4330 8604 4329 8579
4277 8578 4277 8620 4278 8614 4279 8611
4278 8621 4309 8625 4362 8654
TIME...MOT...LOC 0336Z 280DEG 27KT 4354 8648 4295 8646
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH
$$
TJTThe 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 8, 12:09 AM EDT | Special Weather Statement | GRR | Kent, Mecosta, Montcalm, Newaygo | 2 hr |
| 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.