Alert archive / Michigan / Flash Flood Watches in 2011

Flash Flood Watch 2, NWS Detroit, MI

July 28, 201112 counties in Michigan

NWS Detroit, MI issued this flash flood watch at Jul 28, 2011, 3:16 PM EDT for 12 counties in Michigan. It took effect at Jul 28, 2011, 8:00 PM EDT. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued: Jul 28, 2011, 3:16 PM EDT (19:16 UTC)
In effect from: Jul 28, 2011, 8:00 PM EDT
Expired: Jul 29, 2011, 7:40 AM EDT
In force: 12 hr
Issued by: NWS Detroit, MI
Flood severity: None

Counties Genesee County, MI, Lapeer County, MI, Lenawee County, MI, Livingston County, MI, Macomb County, MI, Monroe County, MI, Oakland County, MI, Saginaw County, MI, Saint Clair County, MI, Shiawassee County, MI, Washtenaw County, MI, Wayne County, MI

The radar

The Detroit radar (KDTX), 10 km from the middle of the area, began a volume at 19:16 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, 7.3 hours before the alert went out and 14 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: 348 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 464 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 157 m²/s²
0-3 km storm-relative helicity: 207 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.7

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Detroit, MI wrote its last area forecast discussion before this flash flood watch went out at Jul 28, 1:57 PM EDT, 1 hour 19 minutes earlier.

Area forecast discussion, Jul 28, 1:57 PM EDT, 1 hour 19 minutes before

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Hazardous weather outlook, Jul 28, 4:31 AM EDT, 10 hours 45 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
431 AM EDT THU JUL 28 2011

MIZ047>049-053>055-060>063-068>070-075-076-082-083-290845-
MIDLAND-BAY-HURON-SAGINAW-TUSCOLA-SANILAC-SHIAWASSEE-GENESEE-LAPEER-
ST. CLAIR-LIVINGSTON-OAKLAND-MACOMB-WASHTENAW-WAYNE-LENAWEE-MONROE-
431 AM EDT THU JUL 28 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST
MICHIGAN.

.DAY ONE...TODAY AND TONIGHT

A STATIONARY FRONTAL BOUNDARY WILL REMAIN IN PLACE OVER
SOUTHEASTERN MICHIGAN TODAY AND TONIGHT. THIS FRONTAL BOUNDARY IS
EXPECTED TO BRING ADDITIONAL ROUNDS OF THUNDERSTORMS TO MUCH OF
THE AREA. A WARM AND MOISTURE LADEN AIRMASS WILL PROVIDE THE FUEL
FOR THESE STORMS. NO ORGANIZED SEVERE WEATHER IS
EXPECTED...ALTHOUGH AN ISOLATED SEVERE STORM REMAINS POSSIBLE. THE
BIGGEST THREAT TODAY AND TONIGHT WILL BE TORRENTIAL RAINFALL. THE
POTENTIAL EXISTS FOR ADDITIONAL FLASH FLOODING ISSUES. STORMS
TODAY AND TONIGHT WILL TRACK TO THE EAST AT 40 MPH.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE FRIDAY MORNING ACROSS
SOUTHEASTERN MICHIGAN. THE STORMS ARE EXPECTED TO MOVE OUT OF THE
REGION EARLY IN THE DAY...SETTING THE STAGES FOR A WONDERFUL
AFTERNOON AND EVENING ON FRIDAY.

A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS EXISTS SUNDAY NIGHT
ALONG AN APPROACHING FRONTAL BOUNDARY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED FOR TODAY AND TONIGHT.

LCZ422-423-460-LEZ444-LHZ361>363-421-422-441>443-462>464-290845-
ST. CLAIR RIVER-DETROIT RIVER-LAKE ST. CLAIR-
MICHIGAN WATERS OF LAKE ERIE FROM DETROIT RIVER TO NORTH CAPE MI-
LAKE HURON FROM 5NM EAST OF MACKINAC BRIDGE TO PRESQUE ISLE LT
BEYOND 5 NM OFF SHORE-
LAKE HURON FROM PRESQUE ISLE LIGHT TO STURGEON POINT MI BEYOND 5NM
OFF SHORE-
LAKE HURON FROM STURGEON POINT TO ALABASTER MI BEYOND 5NM OFF SHORE-
OUTER SAGINAW BAY SW OF ALABASTER TO PORT AUSTIN MI TO INNER SAGINAW
BAY-INNER SAGINAW BAY SW OF POINT AU GRES TO BAY PORT MI-
PORT AUSTIN TO HARBOR BEACH MI-HARBOR BEACH TO PORT SANILAC MI-
PORT SANILAC TO PORT HURON MI-
LAKE HURON FROM PORT AUSTIN TO HARBOR BEACH BEYOND 5NM OFF SHORE-
LAKE HURON FROM HARBOR BEACH TO PORT SANILAC BEYOND 5NM OFF SHORE-
LAKE HURON FROM PORT SANILAC TO PORT HURON BEYOND 5NM OFF SHORE-
431 AM EDT THU JUL 28 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF LAKE ERIE...LAKE
HURON AND LAKE ST CLAIR.

.DAY ONE...TODAY AND TONIGHT

A STATIONARY FRONTAL BOUNDARY WILL REMAIN IN PLACE OVER
SOUTHEASTERN MICHIGAN TODAY AND TONIGHT. THIS FRONTAL BOUNDARY IS
EXPECTED TO BRING ADDITIONAL ROUNDS OF THUNDERSTORMS TO MUCH OF
THE AREA. A WARM AND MOISTURE LADEN AIRMASS WILL PROVIDE THE FUEL
FOR THESE STORMS. NO ORGANIZED SEVERE WEATHER IS
EXPECTED...ALTHOUGH AN ISOLATED SEVERE STORM REMAINS POSSIBLE. THE
BIGGEST THREAT TODAY AND TONIGHT WILL BE TORRENTIAL RAINFALL. THE
POTENTIAL EXISTS FOR ADDITIONAL FLASH FLOODING ISSUES. STORMS
TODAY AND TONIGHT WILL TRACK TO THE EAST AT 40 MPH.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE FRIDAY MORNING ACROSS
SOUTHEASTERN MICHIGAN. THE STORMS ARE EXPECTED TO MOVE OUT OF THE
REGION EARLY IN THE DAY...SETTING THE STAGES FOR A WONDERFUL
AFTERNOON AND EVENING ON FRIDAY.

A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS EXISTS SUNDAY NIGHT
ALONG AN APPROACHING FRONTAL BOUNDARY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED FOR TODAY AND TONIGHT.

CB

YOU CAN OBTAIN YOUR LATEST NATIONAL WEATHER SERVICE FORECASTS ONLINE
AT WWW.WEATHER.GOV/DETROIT (ALL LOWER CASE).

In the hours before

Local storm report, Jul 28, 9:44 AM EDT, 5 hours 32 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
944 AM EDT THU JUL 28 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0800 AM     HEAVY RAIN       5 SSE FLUSHING          42.99N 83.82W
07/28/2011  E5.34 INCH       GENESEE            MI   BROADCAST MEDIA

            24 HOUR RAINFALL TOTAL.

&&

DKOOK

Local storm report, Jul 28, 9:46 AM EDT, 5 hours 30 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
946 AM EDT THU JUL 28 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0800 AM     HEAVY RAIN       5 SSE FLUSHING          42.99N 83.82W
07/28/2011  M5.34 INCH       GENESEE            MI   BROADCAST MEDIA

            24 HOUR RAINFALL TOTAL.

&&

DKOOK

Local storm report, Jul 28, 9:50 AM EDT, 5 hours 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
950 AM EDT THU JUL 28 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0800 AM     HEAVY RAIN       BELLEVILLE              42.20N 83.48W
07/28/2011  M3.56 INCH       WAYNE              MI   COCORAHS

0800 AM     HEAVY RAIN       NEW BALTIMORE           42.68N 82.74W
07/28/2011  M1.46 INCH       MACOMB             MI   COCORAHS

0800 AM     HEAVY RAIN       SHELBY TOWNSHIP         42.67N 83.03W
07/28/2011  M2.11 INCH       MACOMB             MI   COCORAHS

0800 AM     HEAVY RAIN       CLINTION TOWNSHIP       42.59N 82.92W
07/28/2011  M1.97 INCH       MACOMB             MI   COCORAHS

0800 AM     HEAVY RAIN       MONROE                  41.92N 83.39W
07/28/2011  M0.98 INCH       MONROE             MI   COCORAHS

0800 AM     HEAVY RAIN       PLYMOUTH                42.37N 83.47W
07/28/2011  M1.86 INCH       WAYNE              MI   COCORAHS

0800 AM     HEAVY RAIN       YPSILANTI               42.24N 83.62W
07/28/2011  M3.89 INCH       WASHTENAW          MI   COCORAHS

0800 AM     HEAVY RAIN       CANTON                  42.31N 83.48W
07/28/2011  M1.91 INCH       WAYNE              MI   COCORAHS

0800 AM     HEAVY RAIN       LIVONIA                 42.40N 83.37W
07/28/2011  M1.63 INCH       WAYNE              MI   COCORAHS

0800 AM     HEAVY RAIN       LINDEN                  42.82N 83.78W
07/28/2011  M2.70 INCH       GENESEE            MI   COCORAHS

0800 AM     HEAVY RAIN       STERLING HEIGHTS        42.58N 83.03W
07/28/2011  M1.87 INCH       MACOMB             MI   COCORAHS

0800 AM     HEAVY RAIN       WHITE LAKE              42.65N 83.50W
07/28/2011  M2.90 INCH       OAKLAND            MI   COCORAHS

0800 AM     HEAVY RAIN       MILFORD                 42.59N 83.60W
07/28/2011  M3.22 INCH       OAKLAND            MI   COCORAHS

0800 AM     HEAVY RAIN       1 N FERNDALE            42.47N 83.13W
07/28/2011  M2.70 INCH       OAKLAND            MI   COCORAHS

0800 AM     HEAVY RAIN       WATERFORD               42.66N 83.39W
07/28/2011  M3.48 INCH       OAKLAND            MI   COCORAHS

0800 AM     HEAVY RAIN       ORTONVILLE              42.85N 83.44W
07/28/2011  M5.13 INCH       OAKLAND            MI   COCORAHS

0800 AM     HEAVY RAIN       COMMERCE                42.59N 83.49W
07/28/2011  M3.65 INCH       OAKLAND            MI   COCORAHS

&&

ADODSON

Local storm report, Jul 28, 11:35 AM EDT, 3 hours 41 minutes before

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Local storm report, Jul 28, 11:59 AM EDT, 3 hours 17 minutes before

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Local storm report, Jul 28, 12:15 PM EDT, 3 hours 1 minute before

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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, 4:31 AM EDT	Flash Flood Warning	DTX	Genesee, 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

Nearby

Flash Flood Watches in Michigan, 2011 Every flash flood watch 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.