Alert archive / Michigan / Flash Flood Warnings in 2021
Flash Flood Warning 1, NWS Grand Rapids, MI
NWS Grand Rapids, MI issued this flash flood warning at Aug 29, 2021, 2:33 PM EDT for Lake County, Michigan. It was in force for 8 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 29, 2021, 2:33 PM EDT (18:33 UTC)
- Expired
- Aug 29, 2021, 10:30 PM EDT
- In force
- 8 hr
- Issued by
- NWS Grand Rapids, MI
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Lake County, MI
The radar
The Grand Rapids radar (KGRR), 118 km from the middle of the area, began a volume at 18:35 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 12:00Z, 6.6 hours before the alert went out and 184 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
- 1272 J/kg
- Mixed-layer CIN
- -49 J/kg
- Mixed-layer LCL
- 845 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 207 m²/s²
- 0-3 km storm-relative helicity
- 216 m²/s²
- Significant tornado parameter
- 1.3
- Supercell composite
- 6.5
The text
As transmitted.
818
WGUS53 KGRR 291833
FFWGRR
MIC085-300230-
/O.NEW.KGRR.FF.W.0001.210829T1833Z-210830T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Grand Rapids MI
233 PM EDT Sun Aug 29 2021
The National Weather Service in Grand Rapids has issued a
* Flash Flood Warning for...
Southwestern Lake County in west central Michigan...
* Until 1030 PM EDT Sunday.
* At 233 PM EDT, Radar indicated that heavy rain has resulted in
significant rises on the Baldwin river. Flooding was occurring
around Baldwin and Green Cottage. Flash flooding is already
occurring. The flooding will works its way down portions of the
Pere Marquette River. It is possible that a small dam in the
upper portions of the Baldwin River may have been breached.
HAZARD...Life threatening flash flooding. Heavy rain producing
flash flooding.
SOURCE...Radar and automated gauges.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
Baldwin and Idlewild.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to higher ground now. Act quickly to protect your life.
&&
LAT...LON 4393 8604 4393 8602 4393 8596 4387 8588
4398 8577 4397 8571 4397 8570 4383 8585
4389 8597 4390 8604 4391 8604 4392 8604
FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
MJS2 follow-up statements
644
WGUS73 KGRR 292313
FFSGRR
Flash Flood Statement
National Weather Service Grand Rapids MI
713 PM EDT Sun Aug 29 2021
MIC085-300230-
/O.CON.KGRR.FF.W.0001.000000T0000Z-210830T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lake MI-
713 PM EDT Sun Aug 29 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1030 PM EDT THIS
EVENING FOR SOUTHWESTERN LAKE COUNTY...
At 713 PM EDT, Water levels along the Baldwin River downstream into
the Pere Marquette River to the county line will continue to
experience flooding. No additional rain is predicted this evening
HAZARD...Life threatening flash flooding. Some evacuations have
already occurred.
SOURCE...Trained spotters reported.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Baldwin and Idlewild.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to higher ground now. Act quickly to protect your life.
&&
LAT...LON 4393 8604 4393 8602 4393 8596 4387 8588
4398 8577 4397 8571 4397 8570 4383 8585
4389 8597 4390 8604 4391 8604 4392 8604
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
MJS317
WGUS73 KGRR 300229
FFSGRR
Flash Flood Statement
National Weather Service Grand Rapids MI
1029 PM EDT Sun Aug 29 2021
MIC085-300239-
/O.EXP.KGRR.FF.W.0001.000000T0000Z-210830T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lake MI-
1029 PM EDT Sun Aug 29 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 1030 PM EDT THIS EVENING FOR
SOUTHWESTERN LAKE COUNTY...
Flood waters have receded. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 4393 8604 4393 8602 4393 8596 4387 8588
4398 8577 4397 8571 4397 8570 4383 8585
4389 8597 4390 8604 4391 8604 4392 8604
$$
WDMThe office that day
Everything else NWS Grand Rapids, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 28, 9:02 PM EDT | Special Weather Statement | GRR | Clinton | 58 min |
| Aug 28, 11:14 PM EDT | Special Weather Statement | GRR | Clinton | 61 min |
| Aug 29, 2:21 AM EDT | Areal Flood Advisory | GRR | Mason | 5 hr |
| Aug 29, 1:54 PM EDT | Special Marine Warning | GRR | 2 hr | |
| Aug 29, 2:49 PM EDT | Special Marine Warning | GRR | 113 min | |
| Aug 29, 3:11 PM EDT | Areal Flood Warning | GRR | Mason | 17 hr |
| Aug 29, 3:18 PM EDT | Severe Thunderstorm Warning | GRR | Muskegon | 28 min |
| Aug 29, 3:26 PM EDT | Severe Thunderstorm Warning | GRR | Barry, Ionia, Kent | 28 min |
| Aug 29, 4:04 PM EDT | Severe Thunderstorm Warning | GRR | Clinton, Ionia | 56 min |
| Aug 29, 5:21 PM EDT | Severe Thunderstorm Warning | GRR | Ingham | 24 min |
Nearby
Flash Flood Warnings in Michigan, 2021Every flash flood 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.