Alert archive / Michigan / Flash Flood Warnings in 2021
Flash Flood Warning 3, NWS Detroit, MI
NWS Detroit, MI issued this flash flood warning at Jul 24, 2021, 8:45 PM EDT for Macomb County, Oakland County, Michigan. It was in force for 4 hr. 7 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
- Jul 24, 2021, 8:45 PM EDT (00:45 UTC)
- Expired
- Jul 25, 2021, 12:45 AM EDT
- In force
- 4 hr
- Issued by
- NWS Detroit, MI
- Area
- Storm-based polygon
- Flood severity
- None
Counties Macomb County, MI, Oakland County, MI
The radar
The Detroit radar (KDTX), 25 km from the middle of the area, began a volume at 00:45 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 |
|---|---|---|---|
| Jul 24, 8:50 PM EDT | FLOOD | 4 Sw Troy, MI | FLOODING OF THE UNDERPASS AT THE INTERSECTION OF E MAPLE RD AND S EATON ST. |
| Jul 24, 9:08 PM EDT | FLOOD | 4 W Warren, MI | FLOODING BLOCKED ALL LANES OF TRAFFIC AT I-75 SOUTHBOUND AND 11 MILE ROAD. |
| Jul 24, 9:08 PM EDT | HEAVY RAIN 2.16 | Troy, MI | 2 HOUR RAINFALL TOTAL |
| Jul 24, 9:17 PM EDT | HEAVY RAIN 1.2 | N Troy, MI | 1.5 HOUR RAINFALL TOTAL |
| Jul 24, 9:24 PM EDT | HEAVY RAIN 1.06 | 2 Wnw St. Clair Shores, MI | 1 HOUR RAINFALL TOTAL |
| Jul 24, 9:30 PM EDT | HEAVY RAIN 2.42 | Bloomfield Hills, MI | 1.5 HOUR RAINFALL TOTAL |
| Jul 24, 9:30 PM EDT | HEAVY RAIN 3.57 | 1 Ne Highland, MI | 2 HOUR STORM TOTAL MOST OF WHICH FELL IN AN HOUR |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Alpena, MI (KAPX), launched 00:00Z, 0.8 hours before the alert went out and 280 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
- 2 J/kg
- Mixed-layer CIN
- -124 J/kg
- Mixed-layer LCL
- 959 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- -67 m²/s²
- 0-3 km storm-relative helicity
- -34 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
774
WGUS53 KDTX 250045
FFWDTX
MIC099-125-250445-
/O.NEW.KDTX.FF.W.0003.210725T0045Z-210725T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Detroit/Pontiac MI
845 PM EDT Sat Jul 24 2021
The National Weather Service in Detroit/Pontiac has issued a
* Flash Flood Warning for...
Southern Macomb County in southeastern Michigan...
Oakland County in southeastern Michigan...
* Until 1245 AM EDT.
* At 845 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2 and 4 inches of rain
have fallen. Additional rainfall amounts up 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, Sterling Heights, Royal Oak,
Birmingham, Rochester, South Lyon, Northville, Clinton, West
Bloomfield, Clarkston, Detroit Zoo and Farmington Hills.
This includes the following highways...
I-94 between mile markers 226 and 233...and
between mile markers 234 and 238...and
between mile markers 1 and 28.
I-96 between mile markers 154 and 167.
I-75 between mile markers 60 and 98.
M-53 between mile markers 16 and 18.
M-10 between mile markers 13 and 18.
M-59 between mile markers 38 and 49.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4278 8369 4278 8338 4266 8311 4258 8275
4254 8279 4254 8281 4245 8287 4243 8366
FLASH FLOOD...RADAR INDICATED
$$
DG2 follow-up statements
041
WGUS73 KDTX 250134
FFSDTX
Flash Flood Statement
National Weather Service Detroit/Pontiac MI
934 PM EDT Sat Jul 24 2021
MIC099-125-250445-
/O.CON.KDTX.FF.W.0003.000000T0000Z-210725T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Macomb MI-Oakland MI-
934 PM EDT Sat Jul 24 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1245 AM EDT SUNDAY
FOR SOUTHERN MACOMB AND OAKLAND COUNTIES...
At 934 PM EDT, While the thunderstorms with torrential rainfall have
moved south of the region, runoff continues from an estimated 2 to 4
inches of rain that has fallen in many locations.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Warren, Livonia, Troy, Southfield, St. Clair Shores, Pontiac,
Novi, Mount Clemens, Milford, Sterling Heights, Royal Oak,
Birmingham, Rochester, South Lyon, Northville, Clinton, West
Bloomfield, Clarkston, Detroit Zoo and Farmington Hills.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 4278 8369 4278 8338 4266 8311 4258 8275
4254 8279 4254 8281 4245 8287 4243 8366
FLASH FLOOD...RADAR INDICATED
$$
DG290
WGUS73 KDTX 250436
FFSDTX
Flash Flood Statement
National Weather Service Detroit/Pontiac MI
1236 AM EDT Sun Jul 25 2021
MIC099-125-250446-
/O.EXP.KDTX.FF.W.0003.000000T0000Z-210725T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Macomb MI-Oakland MI-
1236 AM EDT Sun Jul 25 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 1245 AM EDT EARLY THIS MORNING
FOR SOUTHERN MACOMB AND OAKLAND COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat as water continues to recede across the area. Please continue
to heed remaining road closures.
LAT...LON 4278 8369 4278 8338 4266 8311 4258 8275
4254 8279 4254 8281 4245 8287 4243 8366
$$
DGThe office that day
Everything else NWS Detroit, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 24, 8:01 PM EDT | Severe Thunderstorm Warning | DTX | Macomb | 59 min |
| Jul 24, 8:07 PM EDT | Tornado Warning | DTX | Macomb, Saint Clair | 12 min |
| Jul 24, 8:14 PM EDT | Severe Thunderstorm Warning | DTX | Washtenaw, Wayne | 76 min |
| Jul 24, 8:23 PM EDT | Special Marine Warning | DTX | 67 min | |
| Jul 24, 8:26 PM EDT | Special Marine Warning | DTX | 64 min | |
| Jul 24, 8:50 PM EDT | Severe Thunderstorm Warning | DTX | Lenawee, Washtenaw | 55 min |
| Jul 24, 8:58 PM EDT | Severe Thunderstorm Warning | DTX | Monroe | 77 min |
| Jul 24, 8:59 PM EDT | Flash Flood Warning | DTX | Wayne | 4 hr |
| Jul 24, 9:06 PM EDT | Special Marine Warning | DTX | 69 min | |
| Jul 24, 9:27 PM EDT | Special Marine Warning | DTX | 20 min | |
| Jul 24, 9:30 PM EDT | Severe Thunderstorm Warning | DTX | Wayne | 16 min |
| Jul 24, 9:41 PM EDT | Severe Thunderstorm Warning | DTX | Lenawee | 44 min |
| Jul 25, 4:03 AM EDT | Dense Fog Advisory | DTX | Huron, Lapeer, Lenawee, Livingston, Macomb, Monroe and 6 more | 5 hr |
| Jul 25, 8:12 AM EDT | River Flood Warning | DTX | Wayne | 23 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.