Alert archive / Michigan / Flash Flood Warnings in 2021

Flash Flood Warning 4, NWS Detroit, MI

July 24, 2021Wayne County, Michigan

NWS Detroit, MI issued this flash flood warning at Jul 24, 2021, 8:59 PM EDT for Wayne County, Michigan. It was in force for 4 hr. 4 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, 8:59 PM EDT (00:59 UTC)
Expired: Jul 25, 2021, 1:00 AM EDT
In force: 4 hr
Issued by: NWS Detroit, MI
Area: Storm-based polygon
Flood severity: None

County Wayne County, MI

The radar

The Detroit radar (KDTX), 47 km from the middle of the area, began a volume at 00:57 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, 9:08 PM EDT	FLOOD	3 Ne Detroit, MI	FLOODING BLOCKED ALL LANES ALONG I-75 IN THE AREA OF HOLBROOK AVE AND CANIFF ST.
Jul 24, 9:17 PM EDT	HEAVY RAIN 2.02	1 S Livonia, MI	1 HOUR RAINFALL TOTAL
Jul 24, 10:00 PM EDT	FLOOD	1 Sse Dearborn, MI	SEVERAL ROAD CLOSURES ALONG M-39 BETWEEN JOY ROAD AND ROTUNDA DRIVE.
Jul 24, 10:31 PM EDT	FLOOD	1 N Detroit, MI	FLOODING ON ROADWAYS LEAD TO REMOVAL OF CARS AT THE DAVISON AND JOHN C LODGE FREEWAYS.

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, 1.0 hours before the alert went out and 309 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

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

Open this sounding in Storm Lab

The text

As transmitted.

940 
WGUS53 KDTX 250059
FFWDTX
MIC163-250500-
/O.NEW.KDTX.FF.W.0004.210725T0059Z-210725T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Detroit/Pontiac MI
859 PM EDT Sat Jul 24 2021

The National Weather Service in Detroit/Pontiac has issued a

* Flash Flood Warning for...
  Northern Wayne County in southeastern Michigan...

* Until 100 AM EDT.

* At 859 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 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...
  Livonia, Taylor, Grosse Pointe, Downtown Detroit, Canton, Detroit, 
  Dearborn, Wyandotte, Northville, Greenfield Village, Belle Isle, 
  Westland, Dearborn Heights, Lincoln Park, Allen Park, Garden City, 
  Inkster, Hamtramck, Grosse Pointe Woods and Harper Woods.

This includes the following highways...
	I-94 between mile markers 204 and 225.
	I-96 between mile markers 168 and 192.
	I-275 between mile markers 27 and 29.
	I-75 between mile markers 41 and 58.
	M-10 between mile markers 1 and 12.
	M-39 between mile markers 6 and 10.
	M-14 between mile markers 20 and 21.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Move to higher ground now. Act quickly to protect your life.

&&

LAT...LON 4233 8341 4243 8355 4245 8287 4238 8287
      4234 8296 4231 8308 4222 8313

FLASH FLOOD...RADAR INDICATED

$$

DG

2 follow-up statements

241 
WGUS73 KDTX 250216
FFSDTX

Flash Flood Statement
National Weather Service Detroit/Pontiac MI
1016 PM EDT Sat Jul 24 2021

MIC163-250500-
/O.CON.KDTX.FF.W.0004.000000T0000Z-210725T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Wayne MI-
1016 PM EDT Sat Jul 24 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1 AM EDT SUNDAY FOR 
NORTHERN WAYNE COUNTY...

At 1016 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...
  Livonia, Taylor, Grosse Pointe, Downtown Detroit, Canton, Detroit, 
  Dearborn, Wyandotte, Northville, Greenfield Village, Belle Isle, 
  Westland, Dearborn Heights, Lincoln Park, Allen Park, Garden City, 
  Inkster, Hamtramck, Grosse Pointe Woods and Harper Woods.

T

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 4233 8341 4243 8355 4245 8287 4238 8287
      4234 8296 4231 8308 4222 8313

FLASH FLOOD...RADAR INDICATED

$$

DG

826 
WGUS73 KDTX 250456
FFSDTX

Flash Flood Statement
National Weather Service Detroit/Pontiac MI
1256 AM EDT Sun Jul 25 2021

MIC163-250506-
/O.EXP.KDTX.FF.W.0004.000000T0000Z-210725T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Wayne MI-
1256 AM EDT Sun Jul 25 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 1 AM EDT EARLY THIS MORNING 
FOR NORTHERN WAYNE COUNTY...

The heavy rain has ended. Flooding is no longer expected to pose a 
major threat as water continues to gradually recede across the area. 
Please continue to heed all remaining road closures.

LAT...LON 4233 8341 4243 8355 4245 8287 4238 8287
      4234 8296 4231 8308 4222 8313

$$

DG

The 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 Tornado observed	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, 8:45 PM EDT	Flash Flood Warning	DTX	Macomb, Oakland	4 hr
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, 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, 2021 Every 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.