Alert archive / Michigan / Flash Flood Warnings in 2012

Flash Flood Warning 2, NWS Detroit, MI

March 15, 2012Genesee County, Lapeer County, Tuscola County, Michigan

NWS Detroit, MI issued this flash flood warning at Mar 15, 2012, 7:19 PM EDT for Genesee County, Lapeer County, Tuscola County, Michigan. It was in force for 5 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
Mar 15, 2012, 7:19 PM EDT (23:19 UTC)
Expired
Mar 16, 2012, 12:47 AM EDT
In force
5 hr
Issued by
NWS Detroit, MI
Area
Storm-based polygon
Flood severity
None

Counties Genesee County, MI, Lapeer County, MI, Tuscola County, MI

The radar

The Detroit radar (KDTX), 55 km from the middle of the area, began a volume at 23:22 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 12:00Z, 11.3 hours before the alert went out and 52 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-pSkew-T log-p diagram, Detroit, MI at 12:00Z on 2012-03-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2007 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Detroit, MI at 12:00Z on 2012-03-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 78 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
2007 J/kg
Mixed-layer CIN
-65 J/kg
Mixed-layer LCL
802 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
78 m²/s²
0-3 km storm-relative helicity
66 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

992 
WGUS53 KDTX 152319
FFWDTX
MIC049-087-157-160530-
/O.NEW.KDTX.FF.W.0002.120315T2319Z-120316T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
719 PM EDT THU MAR 15 2012

THE NATIONAL WEATHER SERVICE IN DETROIT/PONTIAC HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN GENESEE COUNTY IN SOUTHEAST MICHIGAN...
  NORTHWESTERN LAPEER COUNTY IN SOUTHEAST MICHIGAN...
  SOUTHERN TUSCOLA COUNTY IN SOUTHEAST MICHIGAN...

* UNTIL 130 AM EDT FRIDAY

* AT 718 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE   
WARNED AREA. ESTIMATES IN EXCESS OF 4 INCHES HAVE FALLEN...WITH 
ADDITIONAL RAINFALL STILL POSSIBLE.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  COLUMBIAVILLE...MAYVILLE...MILLINGTON...NORTH BRANCH...VASSAR...
  CLIFFORD...LUM...MOUNT MORRIS...OTISVILLE AND OTTER LAKE.

RAINFALL ESTIMATES OF 4 INCHES HAVE FALLEN...WITH ADDITIONAL 
RAINFALL POSSIBLE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

&&

LAT...LON 4304 8312 4306 8371 4322 8372 4322 8369
      4337 8370 4338 8312

$$

DRK
2 follow-up statements
482 
WGUS73 KDTX 160142
FFSDTX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
942 PM EDT THU MAR 15 2012

MIC049-087-157-160530-
/O.CON.KDTX.FF.W.0002.000000T0000Z-120316T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GENESEE MI-LAPEER MI-TUSCOLA MI-
942 PM EDT THU MAR 15 2012

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR SOUTHERN 
TUSCOLA...NORTHWESTERN LAPEER...AND NORTHEASTERN GENESEE COUNTIES 
UNTIL 130 AM EDT...

AT 942 PM EDT...SCATTERED THUNDERSTORMS CONTINUED OVER THE REGION 
BUT COVERAGE AND INTENSITY WERE DIMINISHING. THIS WILL ALLOW RUNOFF 
TO PROGRESS AND FLOODING TO GRADUALLY SUBSIDE DURING THE REST OF THE 
EVENING. 

DOPPLER RADAR INDICATED THE AXIS OF HEAVIEST RAINFALL FROM EARLIER 
STORMS EXTENDED FROM TUSCOLA TO MILLINGTON TO COLUMBIAVILLE TO KINGS 
MILL. FLASH FLOODING IMPACTS ARE ALSO POSSIBLE IN AND NEAR 
MAYVILLE...NORTH BRANCH...VASSAR...CLIFFORD...LUM...MOUNT 
MORRIS...OTISVILLE AND OTTER LAKE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM THE STORMS WILL CONTINUE TO CAUSE MINOR 
FLOODING OF SMALL CREEKS AND STREAMS...HIGHWAYS...STREETS AND OTHER 
DRAINAGE AREAS AND LOW LYING SPOTS.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLOODING IS OBSERVED...ACT QUICKLY. DO NOT 
ENTER THE WATER. DO NOT DRIVE INTO WATER OF UNKNOWN DEPTH.

&&

LAT...LON 4304 8312 4306 8371 4322 8372 4322 8369
      4337 8370 4338 8312

$$

BT
507 
WGUS73 KDTX 160447
FFSDTX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
1247 AM EDT FRI MAR 16 2012

MIC049-087-157-160458-
/O.CAN.KDTX.FF.W.0002.000000T0000Z-120316T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GENESEE MI-LAPEER MI-TUSCOLA MI-
1247 AM EDT FRI MAR 16 2012

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR SOUTHERN TUSCOLA...
NORTHWESTERN LAPEER AND NORTHEASTERN GENESEE COUNTIES IS CANCELLED...

AS OF 1245 AM...RAIN HAD ENDED OVER THE AREA. THE DRY CONDITIONS 
OVER THE LAST FEW HOURS HAS ALLOWED FLASH FLOOD PRODUCING RUNOFF TO 
EASE. HOWEVER...MOTORISTS SHOULD BE ALERT FOR STANDING WATER ON AND 
NEAR AREA ROADS DURING THE REST OF THE NIGHT. 

LAT...LON 4304 8312 4306 8371 4322 8372 4322 8369
      4337 8370 4338 8312

$$

BT

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 15, 10:35 AM EDTSpecial Marine WarningDTX55 min
Mar 15, 10:55 AM EDTSevere Thunderstorm WarningDTXMacomb, Wayne30 min
Mar 15, 12:56 PM EDTSpecial Marine WarningDTX94 min
Mar 15, 1:56 PM EDTSpecial Marine WarningDTX64 min
Mar 15, 3:03 PM EDTSevere Thunderstorm WarningDTXHuron72 min
Mar 15, 3:06 PM EDTSpecial Marine WarningDTX105 min
Mar 15, 3:24 PM EDTSpecial Marine WarningDTX2 hr
Mar 15, 3:28 PM EDTSpecial Marine WarningDTX92 min
Mar 15, 3:31 PM EDTSevere Thunderstorm WarningDTXBay59 min
Mar 15, 4:01 PM EDTSevere Thunderstorm WarningDTXHuron48 min
Mar 15, 4:09 PM EDTSevere Thunderstorm WarningDTXLivingston81 min
Mar 15, 4:26 PM EDTSevere Thunderstorm WarningDTXGenesee, Saginaw30 min
Mar 15, 4:28 PM EDTSevere Thunderstorm WarningDTXBay77 min
Mar 15, 4:36 PM EDTSevere Thunderstorm WarningDTXLenawee84 min
Mar 15, 4:40 PM EDTSevere Thunderstorm WarningDTXGenesee, Tuscola95 min
Mar 15, 4:42 PM EDTSevere Thunderstorm WarningDTXShiawassee55 min
Mar 15, 4:53 PM EDTSpecial Marine WarningDTX97 min
Mar 15, 4:57 PM EDTSevere Thunderstorm WarningDTXWashtenaw93 min
Mar 15, 5:07 PM EDTTornado WarningDTXLivingston, Washtenaw53 min
Mar 15, 5:28 PM EDTSpecial Marine WarningDTX92 min
Mar 15, 5:28 PM EDTTornado WarningDTXWashtenaw62 min
Mar 15, 5:33 PM EDTSevere Thunderstorm WarningDTXMonroe87 min
Mar 15, 5:37 PM EDTSevere Thunderstorm WarningDTXLapeer, Tuscola83 min
Mar 15, 5:45 PM EDTTornado WarningDTXMonroe16 min
Mar 15, 6:16 PM EDTSevere Thunderstorm WarningDTXGenesee, Tuscola29 min
Mar 15, 6:22 PM EDTSpecial Marine WarningDTX113 min
Mar 15, 6:28 PM EDTTornado WarningDTXWashtenaw47 min
Mar 15, 6:33 PM EDTSevere Thunderstorm WarningDTXLenawee42 min
Mar 15, 6:34 PM EDTSevere Thunderstorm WarningDTXTuscola56 min
Mar 15, 6:44 PM EDTTornado WarningDTXLapeer34 min
Mar 15, 6:45 PM EDTSevere Thunderstorm WarningDTXOakland29 min
Mar 15, 6:51 PM EDTFlash Flood WarningDTXWashtenaw3 hr
Mar 15, 6:57 PM EDTSpecial Marine WarningDTX93 min
Mar 15, 6:58 PM EDTTornado WarningDTXLenawee, Monroe47 min
Mar 15, 7:03 PM EDTSevere Thunderstorm WarningDTXWayne25 min
Mar 15, 7:06 PM EDTSevere Thunderstorm WarningDTXHuron, Sanilac54 min
Mar 15, 7:12 PM EDTSpecial Marine WarningDTX2 hr
Mar 15, 7:17 PM EDTSevere Thunderstorm WarningDTXLapeer73 min
Mar 15, 7:26 PM EDTSevere Thunderstorm WarningDTXBay16 min
Mar 15, 7:47 PM EDTSevere Thunderstorm WarningDTXMonroe52 min
Mar 15, 7:52 PM EDTSevere Thunderstorm WarningDTXLapeer47 min
Mar 15, 7:55 PM EDTSevere Thunderstorm WarningDTXLenawee44 min

Nearby

Flash Flood Warnings in Michigan, 2012Every flash flood warning in 2012

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.