Alert archive / Michigan / Flash Flood Warnings in 2021
Flash Flood Warning 9, NWS Detroit, MI
NWS Detroit, MI issued this flash flood warning at Aug 27, 2021, 1:56 PM EDT for Wayne County, Michigan. It was in force for 2 hr. 2 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 27, 2021, 1:56 PM EDT (17:56 UTC)
- Expired
- Aug 27, 2021, 4:14 PM EDT
- In force
- 2 hr
- Issued by
- NWS Detroit, MI
- Area
- Storm-based polygon
- Flood severity
- None
County Wayne County, MI
The radar
The Detroit radar (KDTX), 54 km from the middle of the area, began a volume at 17:58 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 27, 1:56 PM EDT | FLOOD | 5 Ne Downtown Detroit, MI | I94 ALL LANED CLOSED AROUND CONNER ST INTERSECTION |
| Aug 27, 3:16 PM EDT | HEAVY RAIN 1.81 | 6 Ene Detroit, MI | 3 HOUR TOTAL RAINFALL MEASURED AT KDET DETROIT CITY AIRPORT. |
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 12:00Z, 5.9 hours before the alert went out and 53 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
- 319 J/kg
- Mixed-layer CIN
- -61 J/kg
- Mixed-layer LCL
- 912 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 24 m²/s²
- 0-3 km storm-relative helicity
- 75 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
The text
As transmitted.
496
WGUS53 KDTX 271756
FFWDTX
MIC163-272100-
/O.NEW.KDTX.FF.W.0009.210827T1756Z-210827T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Detroit/Pontiac MI
156 PM EDT Fri Aug 27 2021
The National Weather Service in Detroit/Pontiac has issued a
* Flash Flood Warning for...
Northeastern Wayne County in southeastern Michigan...
* Until 500 PM EDT.
* At 156 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2 inches of rain
have fallen. The expected rainfall rate is 1.5 to 2.5 inches in 1
hour. 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...
Grosse Pointe, Downtown Detroit, Eastpointe, Hamtramck, Hazel
Park, Grosse Pointe Woods, Harper Woods, Highland Park, Grosse
Pointe Park, Grosse Pointe Farms, Northeast Detroit and Grosse
Pointe Shores.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 4245 8286 4236 8288 4234 8299 4231 8308
4245 8309
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1.5-2.5 INCHES IN 1 HOUR
$$
Behnke2 follow-up statements
871
WGUS73 KDTX 271847
FFSDTX
Flash Flood Statement
National Weather Service Detroit/Pontiac MI
247 PM EDT Fri Aug 27 2021
MIC163-272100-
/O.CON.KDTX.FF.W.0009.000000T0000Z-210827T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Wayne MI-
247 PM EDT Fri Aug 27 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 5 PM EDT THIS
AFTERNOON FOR NORTHEASTERN WAYNE COUNTY...
At 247 PM EDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 1 and 2 inches of rain have
fallen. Flash flooding is ongoing or expected to begin shortly. MDOT
and media reported a freeway closure of I 94 near Conner.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Warren, Grosse Pointe, Downtown Detroit, Eastpointe, Hamtramck,
Hazel Park, Grosse Pointe Woods, Harper Woods, Highland Park, Grosse
Pointe Park, Grosse Pointe Farms, Northeast Detroit and Grosse
Pointe Shores.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 4245 8286 4236 8288 4234 8299 4231 8308
4245 8309
FLASH FLOOD...RADAR INDICATED
$$
Behnke229
WGUS73 KDTX 272014
FFSDTX
Flash Flood Statement
National Weather Service Detroit/Pontiac MI
414 PM EDT Fri Aug 27 2021
MIC163-272024-
/O.CAN.KDTX.FF.W.0009.000000T0000Z-210827T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Wayne MI-
414 PM EDT Fri Aug 27 2021
...FLASH FLOOD WARNING IS CANCELLED FOR NORTHEASTERN WAYNE COUNTY...
The heavy rain has ended. Please continue to heed remaining road
closures.
LAT...LON 4245 8286 4236 8288 4234 8299 4231 8308
4245 8309
$$The office that day
Everything else NWS Detroit, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 26, 9:34 PM EDT | Small Craft Advisory | DTX | 30 hr | |
| Aug 27, 4:04 AM EDT | Beach Hazards Statement | DTX | Huron | 18 hr |
| Aug 27, 6:43 AM EDT | Special Weather Statement | DTX | Bay, Midland, Saginaw | 62 min |
| Aug 27, 8:32 AM EDT | Areal Flood Advisory | DTX | Saginaw | 3 hr |
| Aug 27, 10:03 AM EDT | Areal Flood Advisory | DTX | Genesee | 3 hr |
| Aug 27, 12:08 PM EDT | Special Weather Statement | DTX | Wayne | 67 min |
| Aug 27, 12:22 PM EDT | Special Weather Statement | DTX | Macomb | 68 min |
| Aug 27, 12:47 PM EDT | Areal Flood Advisory | DTX | Oakland, Wayne | 3 hr |
| Aug 27, 12:57 PM EDT | Special Weather Statement | DTX | Macomb | 63 min |
| Aug 27, 1:02 PM EDT | Special Marine Warning | DTX | 58 min | |
| Aug 27, 1:12 PM EDT | Flash Flood Warning | DTX | Oakland, Wayne | 3 hr |
| Aug 27, 4:26 PM EDT | Areal Flood Warning | DTX | Wayne | 6 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.