Alert archive / Michigan / Flash Flood Warnings in 2021
Flash Flood Warning 6, NWS Detroit, MI
NWS Detroit, MI issued this flash flood warning at Aug 12, 2021, 5:41 AM EDT for Macomb County, Oakland County, Wayne County, Michigan. It was in force for 3 hr. 10 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 12, 2021, 5:41 AM EDT (09:41 UTC)
- Expired
- Aug 12, 2021, 8:42 AM EDT
- In force
- 3 hr
- Issued by
- NWS Detroit, MI
- Area
- Storm-based polygon
- Flood severity
- None
Counties Macomb County, MI, Oakland County, MI, Wayne County, MI
The radar
The Detroit radar (KDTX), 37 km from the middle of the area, began a volume at 09:43 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 12, 6:00 AM EDT | HEAVY RAIN 2.7 | Garden City, MI | 6 HOUR RAINFALL. |
| Aug 12, 7:00 AM EDT | FLOOD | 4 Nw St. Clair Shores, MI | FLOODED ROADWAYS AROUND 13 MILE AND GROESBECK HIGHWAY. |
| Aug 12, 7:00 AM EDT | HEAVY RAIN 1.07 | 2 Sw Shelby Township, MI | 24 HOUR RAINFALL. |
| Aug 12, 7:00 AM EDT | HEAVY RAIN 2.21 | Bloomfield Hills, MI | 24 HOUR RAINFALL. |
| Aug 12, 7:00 AM EDT | HEAVY RAIN 2.32 | 4 S Detroit, MI | 24 HOUR RAINFALL. |
| Aug 12, 7:00 AM EDT | HEAVY RAIN 2.4 | Canton, MI | 24 HOUR RAINFALL. |
| Aug 12, 7:30 AM EDT | FLOOD | 5 Nw St. Clair Shores, MI | ROADWAY FLOODED AND CARS STRANDED. |
| Aug 12, 7:30 AM EDT | HEAVY RAIN 2.3 | Beverly Hills, MI | 24 HOUR RAINFALL. |
| Aug 12, 8:00 AM EDT | HEAVY RAIN 2.15 | 4 E White Lake, MI | 24 HOUR RAINFALL TOTAL AT THE NWS DETROIT/PONTIAC OFFICE. |
| Aug 12, 8:30 AM EDT | HEAVY RAIN 2.62 | Farmington, MI | 24 HOUR RAINFALL. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Detroit, MI (KDTX), launched 00:00Z, 9.7 hours before the alert went out and 36 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
- 12 J/kg
- Mixed-layer CIN
- -458 J/kg
- Mixed-layer LCL
- 1474 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 243 m²/s²
- 0-3 km storm-relative helicity
- 373 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
087
WGUS53 KDTX 120941
FFWDTX
MIC099-125-163-121300-
/O.NEW.KDTX.FF.W.0006.210812T0941Z-210812T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Detroit/Pontiac MI
541 AM EDT Thu Aug 12 2021
The National Weather Service in Detroit/Pontiac has issued a
* Flash Flood Warning for...
Southern Macomb County in southeastern Michigan...
Southern Oakland County in southeastern Michigan...
Northern Wayne County in southeastern Michigan...
* Until 900 AM EDT.
* At 541 AM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2 inches of rain
have fallen. Additional rainfall amounts of 1 to 2 inches are
possible in the warned area. Flash flooding is ongoing or expected
to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Warren, Livonia, Troy, Southfield, St. Clair Shores, Pontiac,
Novi, Mount Clemens, Milford, Grosse Pointe, Downtown Detroit,
Canton, Detroit, Sterling Heights, Dearborn, Royal Oak,
Birmingham, South Lyon, Northville and Clinton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4266 8368 4266 8271 4263 8277 4260 8274
4256 8274 4252 8283 4245 8283 4236 8288
4232 8306 4227 8311 4227 8354 4243 8355
4244 8366
FLASH FLOOD...RADAR INDICATED
$$
AM2 follow-up statements
779
WGUS73 KDTX 121048
FFSDTX
Flash Flood Statement
National Weather Service Detroit/Pontiac MI
648 AM EDT Thu Aug 12 2021
MIC099-125-163-121300-
/O.CON.KDTX.FF.W.0006.000000T0000Z-210812T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Macomb MI-Oakland MI-Wayne MI-
648 AM EDT Thu Aug 12 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 9 AM EDT THIS MORNING
FOR SOUTHERN MACOMB, SOUTHERN OAKLAND AND NORTHERN WAYNE COUNTIES...
At 648 AM EDT, Doppler radar indicated scattered thunderstorms
producing heavy rain across the warned area. Between 2 and 3 inches
of rain have fallen. Flooding has been reported on I-94 and the
Davison Freeway. Additional rainfall amounts of 1 to 2 inches are
possible in the warned area this morning.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Warren, Livonia, Troy, Southfield, St. Clair Shores, Pontiac,
Novi, Mount Clemens, Milford, Grosse Pointe, Downtown Detroit,
Canton, Detroit, Sterling Heights, Dearborn, Royal Oak,
Birmingham, South Lyon, Northville and Clinton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4266 8368 4266 8271 4263 8277 4260 8274
4256 8274 4252 8283 4245 8283 4236 8288
4232 8306 4227 8311 4227 8354 4243 8355
4244 8366
FLASH FLOOD...RADAR INDICATED
$$
MR817
WGUS73 KDTX 121242
FFSDTX
Flash Flood Statement
National Weather Service Detroit/Pontiac MI
842 AM EDT Thu Aug 12 2021
MIC099-125-163-121252-
/O.CAN.KDTX.FF.W.0006.000000T0000Z-210812T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Macomb MI-Oakland MI-Wayne MI-
842 AM EDT Thu Aug 12 2021
...FLASH FLOOD WARNING FOR SOUTHERN MACOMB, SOUTHERN OAKLAND AND
NORTHERN WAYNE COUNTIES HAS BEEN REPLACED WITH A FLOOD ADVISORY...
Heavy rain has ended, however it will take time for flood waters to
recede. A flood advisory is in effect through this morning. Please
continue to heed remaining road closures.
LAT...LON 4266 8368 4266 8271 4263 8277 4260 8274
4256 8274 4254 8281 4252 8283 4245 8283
4236 8288 4232 8306 4227 8311 4227 8354
4243 8355 4244 8366
$$
KDKThe office that day
Everything else NWS Detroit, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 10:42 PM EDT | Special Weather Statement | DTX | Genesee, Lapeer, Livingston, Oakland, Shiawassee | 63 min |
| Aug 11, 11:00 PM EDT | Special Weather Statement | DTX | Lenawee, Washtenaw | 60 min |
| Aug 11, 11:34 PM EDT | Special Weather Statement | DTX | Macomb, Monroe, Saint Clair, Wayne | 56 min |
| Aug 12, 12:47 AM EDT | Special Weather Statement | DTX | Tuscola | 43 min |
| Aug 12, 1:14 AM EDT | Special Weather Statement | DTX | Genesee, Shiawassee | 46 min |
| Aug 12, 2:04 AM EDT | Areal Flood Advisory | DTX | Livingston | 2 hr |
| Aug 12, 2:36 AM EDT | Special Weather Statement | DTX | Wayne | 54 min |
| Aug 12, 3:08 AM EDT | Areal Flood Advisory | DTX | Wayne | 4 hr |
| Aug 12, 4:33 AM EDT | Flash Flood Warning | DTX | Livingston | 2 hr |
| Aug 12, 5:18 AM EDT | Areal Flood Advisory | DTX | Macomb, Oakland | 3 hr |
| Aug 12, 6:31 AM EDT | Severe Thunderstorm Warning | DTX | Lenawee, Livingston, Monroe, Washtenaw | 59 min |
| Aug 12, 6:43 AM EDT | Areal Flood Warning | DTX | Livingston | 2 hr |
| Aug 12, 7:09 AM EDT | Severe Thunderstorm Warning | DTX | Macomb, Monroe, Oakland, Wayne | 45 min |
| Aug 12, 7:18 AM EDT | Special Weather Statement | DTX | Monroe | 42 min |
| Aug 12, 7:27 AM EDT | Special Marine Warning | DTX | 34 min | |
| Aug 12, 7:35 AM EDT | River Flood Warning | DTX | Livingston | 18 days |
| Aug 12, 8:42 AM EDT | Areal Flood Advisory | DTX | Macomb, Oakland, Wayne | 3 hr |
| Aug 12, 11:53 AM EDT | River Flood Warning | DTX | Macomb | 7 hr |
| Aug 12, 6:08 PM EDT | River Flood Warning | DTX | Wayne | 15 hr |
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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.