Alert archive / Michigan / Flash Flood Warnings in 2021
Flash Flood Warning 7, NWS Detroit, MI
NWS Detroit, MI issued this flash flood warning at Aug 24, 2021, 9:57 PM EDT for Wayne County, Michigan. It was in force for 2 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 24, 2021, 9:57 PM EDT (01:57 UTC)
- Expired
- Aug 25, 2021, 12:19 AM 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), 69 km from the middle of the area, began a volume at 02:01 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
Detroit, MI (KDTX), launched 00:00Z, 2.0 hours before the alert went out and 70 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
- 3040 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 1099 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 33 m²/s²
- 0-3 km storm-relative helicity
- 25 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
412
WGUS53 KDTX 250157
FFWDTX
MIC163-250500-
/O.NEW.KDTX.FF.W.0007.210825T0157Z-210825T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Detroit/Pontiac MI
957 PM EDT Tue Aug 24 2021
The National Weather Service in Detroit/Pontiac has issued a
* Flash Flood Warning for...
South Central Wayne County in southeastern Michigan...
* Until 100 AM EDT.
* At 957 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2 and 4 inches of rain
have fallen. The expected rainfall rate is 1 to 2 inches in 1
hour. Additional rainfall amounts up to 1 inch 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...
Flat Rock, Trenton, Grosse Ile, Woodhaven, Riverview, Gibraltar
and Rockwood.
This includes the following highways...
I-75 between mile markers 28 and 33.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 4208 8327 4212 8328 4218 8321 4215 8313
4213 8312 4209 8313 4209 8315 4209 8319
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR
$$
Behnke1 follow-up statement
899
WGUS73 KDTX 250419
FFSDTX
Flash Flood Statement
National Weather Service Detroit/Pontiac MI
1219 AM EDT Wed Aug 25 2021
MIC163-250429-
/O.CAN.KDTX.FF.W.0007.000000T0000Z-210825T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Wayne MI-
1219 AM EDT Wed Aug 25 2021
...FLASH FLOOD WARNING IS CANCELLED FOR SOUTH CENTRAL WAYNE COUNTY...
Flood waters have receded. The heavy rain has ended. Flooding is no
longer expected to pose a threat. Please continue to heed remaining
road closures.
LAT...LON 4208 8327 4212 8328 4218 8321 4215 8313
4213 8312 4209 8313 4209 8315 4209 8319
$$
SCThe office that day
Everything else NWS Detroit, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 24, 8:02 PM EDT | Severe Thunderstorm Warning | DTX | Lapeer | 30 min |
| Aug 24, 8:05 PM EDT | Special Weather Statement | DTX | Oakland | 55 min |
| Aug 24, 8:10 PM EDT | Special Weather Statement | DTX | Wayne | 35 min |
| Aug 24, 8:31 PM EDT | Special Weather Statement | DTX | Macomb | 44 min |
| Aug 24, 8:36 PM EDT | Areal Flood Advisory | DTX | Macomb, Oakland, Wayne | 2 hr |
| Aug 24, 9:28 PM EDT | Areal Flood Advisory | DTX | Macomb | 92 min |
| Aug 24, 9:40 PM EDT | Special Weather Statement | DTX | Macomb | 35 min |
| Aug 25, 3:10 AM EDT | Special Weather Statement | DTX | Tuscola | 80 min |
| Aug 25, 3:21 AM EDT | Heat Advisory | DTX | Lenawee, Livingston, Macomb, Monroe, Oakland, Washtenaw and 1 more | 17 hr |
| Aug 25, 5:43 AM EDT | Special Marine Warning | DTX | 26 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.