Alert archive / Michigan / Flash Flood Warnings in 2011

Flash Flood Warning 8, NWS Detroit, MI

July 28, 2011Genesee County, Saginaw County, Shiawassee County, Michigan

NWS Detroit, MI issued this flash flood warning at Jul 28, 2011, 4:31 AM EDT for Genesee County, Saginaw County, Shiawassee County, Michigan. It was in force for 6 hr. 19 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 28, 2011, 4:31 AM EDT (08:31 UTC)
Expired: Jul 28, 2011, 10:30 AM EDT
In force: 6 hr
Issued by: NWS Detroit, MI
Area: Storm-based polygon
Flood severity: None

Counties Genesee County, MI, Saginaw County, MI, Shiawassee County, MI

The radar

The Detroit radar (KDTX), 50 km from the middle of the area, began a volume at 08:31 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 28, 5:02 AM EDT	HEAVY RAIN 4.8	6 Se Swartz Creek, MI	11 HOUR TOTAL. NUMEROUS ROADS FLOODED IN THE AREA.
Jul 28, 5:44 AM EDT	FLOOD	2 S Flint, MI	AT SOUTHBOUND M 23 AND HILL ROAD. HIGHWAY FLOODED WITH VEHICLES STALLED.
Jul 28, 5:44 AM EDT	FLOOD	Flint, MI	STANDING WATER ON ALL LANES OF NORTHBOUND INTERSTATE 75 NEAR CORUNNA ROAD.
Jul 28, 5:44 AM EDT	FLOOD	Grand Blanc, MI	APPROXIMATELY 2 FEET OF WATER IN ROADWAY...NEAR HILL RD AND FENTON RD.
Jul 28, 5:44 AM EDT	HEAVY RAIN 4.75	Corunna, MI
Jul 28, 5:54 AM EDT	HEAVY RAIN 5.7	6 Se Swartz Creek, MI	12 HOUR TOTAL.
Jul 28, 6:17 AM EDT	HEAVY RAIN 5.5	5 Wsw Chesaning, MI
Jul 28, 6:54 AM EDT	FLOOD	4 Nw Flint, MI	STREET FLOODING NEAR W. PIERSON ROAD AND N. JENNINGS RD. A VEHICLE IS STALLED.
Jul 28, 6:54 AM EDT	FLOOD	5 Se Flint, MI	STREET FLOODING NEAR S. DORT HIGHWAY AND EAST BRISTOL ROAD. VEHICLES STALLED.
Jul 28, 6:54 AM EDT	HEAVY RAIN 2.42	Burton, MI
Jul 28, 7:18 AM EDT	FLOOD	Flint, MI	INTERSTATE 75...CORUNNA AND MILLER. ESTIMATED 18 INCHES OF WATER IN THE ROADWAYS.
Jul 28, 8:00 AM EDT	HEAVY RAIN 2.63	Durand, MI
Jul 28, 8:00 AM EDT	HEAVY RAIN 2.7	Linden, MI
Jul 28, 8:00 AM EDT	HEAVY RAIN 4.24	Owosso, MI
Jul 28, 8:00 AM EDT	HEAVY RAIN 4.98	4 Ssw Flint, MI	18 HOUR TOTAL AT FLINT BISHOP AIRPORT
Jul 28, 8:00 AM EDT	HEAVY RAIN 5.22	Chesaning, MI
Jul 28, 8:00 AM EDT	HEAVY RAIN 5.3	Flint, MI	14 HOUR RAINFALL TOTAL.
Jul 28, 8:00 AM EDT	HEAVY RAIN 5.34	5 Sse Flushing, MI	24 HOUR RAINFALL TOTAL.
Jul 28, 8:00 AM EDT	HEAVY RAIN 5.51	Goodrich, MI

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, 8.5 hours before the alert went out and 51 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: 159 J/kg
Mixed-layer CIN: -86 J/kg
Mixed-layer LCL: 634 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 183 m²/s²
0-3 km storm-relative helicity: 206 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

823 
WGUS53 KDTX 280831
FFWDTX
MIC049-145-155-281430-
/O.NEW.KDTX.FF.W.0008.110728T0831Z-110728T1430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
431 AM EDT THU JUL 28 2011

THE NATIONAL WEATHER SERVICE IN DETROIT/PONTIAC HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  GENESEE COUNTY IN SOUTHEAST MICHIGAN...
  SHIAWASSEE COUNTY IN SOUTHEAST MICHIGAN...
  SOUTHERN SAGINAW COUNTY IN SOUTHEAST MICHIGAN...

* UNTIL 1030 AM EDT

* AT 430 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE      
  WARNED AREA. PORTIONS OF THE WARNED AREA RECEIVED BETWEEN 2 AND 3  
  INCHES OF RAIN ON WEDNESDAY EVENING. ADDITIONAL HEAVY RAINFALL     
  WILL MOVE THROUGH THE AREA BY 7 AM BRINGING AN ADDITIONAL 1 TO 3   
  INCHES OF RAIN. TORRENTIAL RAINFALL RATES ARE OCCURRING. 

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...     
  CHESANING...DURAND...FLINT...FLUSHING...GRAND BLANC...NEW          
  LOTHROP...OWOSSO...ST. CHARLES...BANCROFT...BURTON...BYRON...      
  CORUNNA...GAINES...GOODRICH...  HENDERSON...LENNON...MARION        
  SPRINGS...MONTROSE...MOUNT   MORRIS...OAKLEY AND SWARTZ CREEK.

* EXTREMELY HEAVY RAINFALL WILL EFFECT MOTORISTS TRAVELING ON        
  INTERSTATE 69...INTERSTATE 75 AND ROUTE 23 THROUGH THE EARLY       
  MORNING COMMUTE. MOTORISTS SHOULD PLAN TO SLOW DOWN AS THEY        
  ENCOUNTER HEAVY RAINFALL AND FLOODING. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. DO
NOT ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND TO
ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN
WATER BEGINS RISING.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN
DETROIT/PONTIAC.

&&

LAT...LON 4340 8437 4331 8396 4316 8369 4309 8346
      4288 8347 4287 8369 4278 8369 4278 8373
      4279 8395 4289 8437

$$

KEC

2 follow-up statements

088 
WGUS73 KDTX 281119
FFSDTX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
719 AM EDT THU JUL 28 2011

MIC049-145-155-281430-
/O.CON.KDTX.FF.W.0008.000000T0000Z-110728T1430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GENESEE MI-SAGINAW MI-SHIAWASSEE MI-
719 AM EDT THU JUL 28 2011

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR SHIAWASSEE...SOUTHERN
SAGINAW AND GENESEE COUNTIES UNTIL 1030 AM EDT...

BY 7 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT 3 TO 
5 INCHES OF RAIN HAVE FALLEN ACROSS PORTIONS OF SAGINAW...SHIAWASSEE 
AND GENESEE COUNTIES. ALTHOUGH THE RAIN IS COMING TO AN END...THE 
WATER WILL BE SLOW TO RECEDE AND FLOODING WILL CONTINUE ACROSS THE 
WARNING AREA. SMALL CREEKS AND RIVERS WILL BE RUNNING HIGH AND 
SHOULD BE AVOIDED. 

RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLASH FLOODING 
INCLUDE...CHESANING...DURAND...FLINT...FLUSHING...GRAND BLANC...NEW 
LOTHROP...OWOSSO...ST. CHARLES...BANCROFT...BURTON...BYRON...        
CORUNNA...GAINES...GOODRICH...  HENDERSON...LENNON...MARION          
SPRINGS...MONTROSE...MOUNT   MORRIS...OAKLEY AND SWARTZ CREEK.


MANY ROADS HAVE FLOODED ACROSS THE WARNED AREA. FLOODING HAS BEEN 
REPORTED ON SOUTHBOUND INTERSTATE 75 BETWEEN CORUNNA AND MILLER 
ROADS. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.

REPORT FLOODING TO THE NEAREST LAW ENFORCEMENT AGENCY SO THAT THEY
MAY TAKE APPROPRIATE ACTION TO CLOSE FLOODED ROADWAYS. THEY WILL
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN DETROIT/PONTIAC.

&&

LAT...LON 4340 8437 4331 8396 4316 8369 4309 8346
      4288 8347 4287 8369 4278 8369 4278 8373
      4279 8395 4289 8437

$$

KEC

038 
WGUS73 KDTX 281227
FFSDTX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
827 AM EDT THU JUL 28 2011

MIC049-145-155-281430-
/O.CON.KDTX.FF.W.0008.000000T0000Z-110728T1430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GENESEE MI-SAGINAW MI-SHIAWASSEE MI-
827 AM EDT THU JUL 28 2011

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR SHIAWASSEE...SOUTHERN
SAGINAW AND GENESEE COUNTIES UNTIL 1030 AM EDT...

THROUGH 8 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THAT 3 TO 5 INCHES OF RAIN HAVE FALLEN ACROSS PORTIONS OF 
SAGINAW...SHIAWASSEE AND GENESEE COUNTIES. ALTHOUGH THE RAIN WILL 
LARGELY COME TO AN END THIS MORNING...THE WATER WILL BE SLOW TO 
RECEDE AND FLOODING WILL CONTINUE ACROSS THE WARNING AREA. SMALL 
CREEKS AND RIVERS WILL BE RUNNING HIGH AND SHOULD BE AVOIDED. 

RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLASH FLOODING INCLUDE...
CHESANING...CLIO...DAVISON...DURAND...FENTON...FLINT...FLUSHING...
GRAND BLANC...LAINGSBURG...NEW LOTHROP...OWOSSO...ST. CHARLES...
BANCROFT...BURTON...BYRON...CORUNNA...GAINES...GOODRICH...
HENDERSON...LENNON...LINDEN...MARION SPRINGS...MONTROSE...MOUNT
MORRIS...OAKLEY AND SWARTZ CREEK.

MANY ROADS HAVE FLOODED ACROSS THE WARNED AREA WITH STANDING WATER 
RECENTLY REPORTED ON WESTBOUND INTERSTATE 69 NEAR EXIT 133. SWARTZ 
CREEK VALLEY PARK WAS ALSO REPORTEDLY UNDER WATER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.

REPORT FLOODING TO THE NEAREST LAW ENFORCEMENT AGENCY SO THAT THEY
MAY TAKE APPROPRIATE ACTION TO CLOSE FLOODED ROADWAYS. THEY WILL
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN DETROIT/PONTIAC.

&&

LAT...LON 4340 8437 4331 8396 4316 8369 4309 8346
      4288 8347 4287 8369 4278 8369 4278 8373
      4279 8395 4289 8437

$$

DG

The office that day

Everything else NWS Detroit, MI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 27, 9:20 PM EDT	Areal Flood Advisory	DTX	Genesee, Shiawassee	4 hr
Jul 27, 11:09 PM EDT	Areal Flood Advisory	DTX	Washtenaw	4 hr
Jul 27, 11:09 PM EDT	Severe Thunderstorm Warning	DTX	Washtenaw	51 min
Jul 27, 11:55 PM EDT	Flash Flood Warning	DTX	Washtenaw	6 hr
Jul 28, 12:47 AM EDT	Areal Flood Advisory	DTX	Livingston	6 hr
Jul 28, 1:21 AM EDT	Flash Flood Warning	DTX	Monroe, Wayne	6 hr
Jul 28, 3:23 AM EDT	Areal Flood Advisory	DTX	Genesee, Oakland, Saginaw, Shiawassee	6 hr
Jul 28, 4:52 AM EDT	Flash Flood Warning	DTX	Oakland	6 hr
Jul 28, 5:51 AM EDT	Areal Flood Warning	DTX	Washtenaw	8 hr
Jul 28, 6:01 AM EDT	Areal Flood Advisory	DTX	Macomb	4 hr
Jul 28, 7:04 AM EDT	Areal Flood Advisory	DTX	Wayne	3 hr
Jul 28, 10:06 AM EDT	Areal Flood Warning	DTX	Genesee, Oakland, Saginaw, Shiawassee	4 hr
Jul 28, 10:11 AM EDT	River Flood Warning	DTX	Washtenaw	25 hr
Jul 28, 10:11 AM EDT	River Flood Warning	DTX	Macomb	7 hr
Jul 28, 3:16 PM EDT	Flash Flood Watch	DTX	Genesee, Lapeer, Lenawee, Livingston, Macomb, Monroe and 6 more	16 hr

Nearby

Flash Flood Warnings in Michigan, 2011 Every flash flood warning in 2011

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.