Alert archive / Michigan / Flood Watches in 2016

Flood Watch 1, NWS Grand Rapids, MI

August 12, 201612 counties in Michigan

NWS Grand Rapids, MI issued this flood watch at Aug 12, 2016, 3:40 PM EDT for 12 counties in Michigan. It took effect at Aug 12, 2016, 4:00 PM EDT. It was in force for 16 hr.

The area

The counties it named.

The facts

Issued
Aug 12, 2016, 3:40 PM EDT (19:40 UTC)
In effect from
Aug 12, 2016, 4:00 PM EDT
Expired
Aug 13, 2016, 8:00 AM EDT
In force
16 hr
Issued by
NWS Grand Rapids, MI
Flood severity
None

Counties Allegan County, MI, Barry County, MI, Calhoun County, MI, Clinton County, MI, Eaton County, MI, Ingham County, MI, Ionia County, MI, Jackson County, MI, Kalamazoo County, MI, Kent County, MI, Ottawa County, MI, Van Buren County, MI

The radar

The Grand Rapids radar (KGRR), 40 km from the middle of the area, began a volume at 19:40 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, 7.7 hours before the alert went out and 150 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 2016-08-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1934 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Detroit, MI at 12:00Z on 2016-08-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -3 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
1934 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
603 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
-3 m²/s²
0-3 km storm-relative helicity
-1 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

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

NWS Grand Rapids, MI wrote its last area forecast discussion before this flood watch went out at Aug 12, 3:26 PM EDT, 14 minutes earlier.

Area forecast discussion, Aug 12, 3:26 PM EDT, 14 minutes before
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Hazardous weather outlook, Aug 12, 3:54 AM EDT, 11 hours 46 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
354 AM EDT FRI AUG 12 2016

MIZ037>040-043>046-050>052-056>059-064>067-071>074-130800-
MASON-LAKE-OSCEOLA-CLARE-OCEANA-NEWAYGO-MECOSTA-ISABELLA-MUSKEGON-
MONTCALM-GRATIOT-OTTAWA-KENT-IONIA-CLINTON-ALLEGAN-BARRY-EATON-
INGHAM-VAN BUREN-KALAMAZOO-CALHOUN-JACKSON-
354 AM EDT FRI AUG 12 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST LOWER
MICHIGAN.

.DAY ONE...TODAY AND TONIGHT

RAIN WILL BE HEAVY AT TIMES THROUGH TONIGHT. AN ELEVATED RISK FOR
FLOODING EXISTS. URBAN AND POOR DRAINAGE AREAS LOOK MOST PRONE.
IF THE THUNDERSTORMS REPEAT OVER THE SAME AREA...SMALLER STREAMS
AND RIVERS COULD SEE FLOODING AS WELL.

A MARGINAL RISK FOR SEVERE WEATHER EXISTS...MAINLY ALONG AND SOUTH
OF A MUSKEGON TO LANSING LINE. DAMAGING WINDS ARE THE PRIMARY
RISKS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THE HEAVY RAIN COULD PERSIST INTO EARLY SATURDAY MORNING WITH
FLOODING POSSIBLE.

NON SEVERE THUNDERSTORMS ARE POSSIBLE TUESDAY INTO THURSDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED INTO TONIGHT.

LMZ844>849-130800-
ST JOSEPH TO SOUTH HAVEN MI-SOUTH HAVEN TO HOLLAND MI-
HOLLAND TO GRAND HAVEN MI-GRAND HAVEN TO WHITEHALL MI-
WHITEHALL TO PENTWATER MI-PENTWATER TO MANISTEE MI-
354 AM EDT FRI AUG 12 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST LOWER
MICHIGAN.

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS COULD CONTAIN GUSTY WINDS AND FREQUENT CLOUD TO
WATER LIGHTNING STRIKES. WAVES COULD BE LOCALLY HIGHER NEAR AND
THUNDERSTORMS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

NON SEVERE THUNDERSTORMS ARE POSSIBLE TUESDAY INTO THURSDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED INTO TONIGHT.

In the hours before

Local storm report, Aug 12, 10:18 AM EDT, 5 hours 22 minutes before
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
1018 AM EDT FRI AUG 12 2016

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

0630 AM     HEAVY RAIN       1 W SHELBYVILLE         42.59N 85.66W
08/12/2016  E1.30 INCH       ALLEGAN            MI   PUBLIC

            VIA SOCIAL MEDIA. RADAR SUGGESTS THIS IS A 2
            HOUR TOTAL BETWEEN 430 AM AND 630 AM.

0645 AM     HEAVY RAIN       FREEPORT                42.76N 85.31W
08/12/2016  E1.20 INCH       BARRY              MI   BROADCAST MEDIA

            VIEWER REPORT. FELL BETWEEN 245 AND 645 AM
            ACCORDING TO RADAR .

0647 AM     HEAVY RAIN       1 NE IRVING             42.70N 85.40W
08/12/2016  M2.38 INCH       BARRY              MI   MESONET

            3 HOUR TOTAL. 1.15 INCHES WAS RECORDED IN 1
            HOUR. CWOP STATION 1 ENE IRVING /D3807/.

0650 AM     HEAVY RAIN       2 WNW BRADLEY           42.64N 85.68W
08/12/2016  M1.08 INCH       ALLEGAN            MI   MESONET

            3 HOUR TOTAL. CWOP STATION 2 WNW BRADLEY
            /C5467/.

0700 AM     HEAVY RAIN       2 W WAYLAND             42.67N 85.68W
08/12/2016  M1.61 INCH       ALLEGAN            MI   COCORAHS

            24 HOUR TOTAL. RADAR SUGGESTS MAJORITY FELL
            IN 3 HOURS BETWEEN 330 AM AND 630 AM.
            COCORAHS STATION 1 W WAYLAND /MI-AN-1/.

0700 AM     HEAVY RAIN       1 NNE SHELBYVILLE       42.61N 85.63W
08/12/2016  M1.22 INCH       ALLEGAN            MI   COCORAHS

            24 HOUR TOTAL. RADAR SUGGESTS MAJORITY FELL
            IN 3 HOURS BETWEEN 330 AM AND 630 AM.
            COCORAHS STATION 1 NE SHELBYVILLE
            /MI-AN-18/.

0700 AM     HEAVY RAIN       1 NNE HOPKINS           42.64N 85.76W
08/12/2016  M1.14 INCH       ALLEGAN            MI   CO-OP OBSERVER

            24 HOUR TOTAL. RADAR CONFIRMS THE RAIN FELL
            IN ABOUT 3 HOURS ENDING AT 630 AM EDT. CO-OP
            OBSERVER STATION HOPKINS 1 N /HPKM4/.

0730 AM     HEAVY RAIN       1 ENE CASTLE PARK       42.76N 86.18W
08/12/2016  M1.24 INCH       ALLEGAN            MI   COCORAHS

            24 HOUR TOTAL. RADAR SUGGESTS MAJORITY FELL
            IN 4 HOURS BETWEEN 3 AM AND 7 AM. COCORAHS
            STATION 1 ENE CASTLE PARK /MI-AN-16/.

0800 AM     HEAVY RAIN       5 ENE SAUGATUCK         42.68N 86.11W
08/12/2016  M1.08 INCH       ALLEGAN            MI   COCORAHS

            24 HOUR TOTAL. RADAR SUGGESTS IT ALL FELL
            WITHIN 5 HOURS BETWEEN 2 AM AND 7 AM.
            COCORAHS STATION 5 ENE SAUGATUCK /MI-AN-23/.

&&

CAS
Special weather statement, Aug 12, 1:24 PM EDT, 2 hours 16 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
124 PM EDT FRI AUG 12 2016

MIZ056-064-071-121815-
VAN BUREN MI-ALLEGAN MI-OTTAWA MI-
124 PM EDT FRI AUG 12 2016

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN OTTAWA...WESTERN ALLEGAN
AND WESTERN VAN BUREN COUNTIES UNTIL 215 PM EDT...

AT 122 PM EDT...DOPPLER RADAR WAS TRACKING STRONG THUNDERSTORMS
ALONG A LINE EXTENDING FROM 13 MILES WEST OF HOLLAND TO 16 MILES
WEST OF SAINT JOSEPH. MOVEMENT WAS EAST AT 20 MPH.

WINDS IN EXCESS OF 30 MPH WILL BE POSSIBLE WITH THESE STORMS ALONG
WITH CLOUD TO GROUND LIGHTNING STRIKES. TORRENTIAL DOWNPOURS MAY
LEAD TO TEMPORARY FLOODING SEVERAL INCHES DEEP ON SOME ROADWAYS.

LOCATIONS IMPACTED INCLUDE...
HOLLAND...             SOUTH HAVEN...         VAN BUREN SP...
HUDSONVILLE...         ZEELAND...             HARTFORD...
BANGOR...              FENNVILLE...           SAUGATUCK...
SAUGATUCK SP...        BEECHWOOD...           JENISON...
COVERT...              GANGES...              KEELER...
HAMILTON...            DOUGLAS...             LAWRENCE...
BLOOMINGDALE...        BREEDSVILLE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS OCCURRING WITH THESE STORMS...AND MAY LEAD TO
LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

THESE STORMS MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO
STATIONS AND AVAILABLE TELEVISION STATIONS FOR ADDITIONAL INFORMATION
AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

&&

LAT...LON 4207 8622 4224 8622 4224 8636 4249 8625
      4271 8621 4288 8621 4289 8579 4207 8604
TIME...MOT...LOC 1719Z 272DEG 17KT 4281 8647 4214 8682

CAS
Local storm report, Aug 12, 3:17 PM EDT, 23 minutes before
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Local storm report, Aug 12, 3:33 PM EDT, 7 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 12, 1:24 PM EDTSpecial Weather StatementGRRAllegan, Van Buren51 min
Aug 12, 2:12 PM EDTSevere Thunderstorm WarningGRRAllegan45 min
Aug 12, 2:17 PM EDTTornado WarningGRRAllegan28 min

Nearby

Flood Watches in Michigan, 2016Every flood watch in 2016

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.