Alert archive / Michigan / Flash Flood Warnings in 2011

Flash Flood Warning 19, NWS Grand Rapids, MI

August 13, 2011Allegan County, Michigan

NWS Grand Rapids, MI issued this flash flood warning at Aug 13, 2011, 9:52 AM EDT for Allegan County, Michigan. It was in force for 7 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: Aug 13, 2011, 9:52 AM EDT (13:52 UTC)
Expired: Aug 13, 2011, 4:59 PM EDT
In force: 7 hr
Issued by: NWS Grand Rapids, MI
Area: Storm-based polygon
Flood severity: None

County Allegan County, MI

The radar

The Grand Rapids radar (KGRR), 53 km from the middle of the area, began a volume at 13:56 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, 1.9 hours before the alert went out and 216 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 4981 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 133 m²/s²
0-3 km storm-relative helicity: 132 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.

139 
WGUS53 KGRR 131352
FFWGRR
MIC005-132200-
/O.NEW.KGRR.FF.W.0019.110813T1352Z-110813T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
952 AM EDT SAT AUG 13 2011

THE NATIONAL WEATHER SERVICE IN GRAND RAPIDS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  ALLEGAN COUNTY IN SOUTHWEST MICHIGAN...

* UNTIL 600 PM EDT SATURDAY

* AT 949 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL MOVING ACROSS   
  ALLEGAN COUNTY. THE STORMS HAVE BEEN TRAINING ACROSS THE SAME      
  AREAS...ESPECIALLY NEAR GLENN AND CLYDE TOWNSHIPS. RADAR ESTIMATES 
  THAT NEARLY 4 INCHES OF RAIN MAY HAVE FALLEN IN THIS AREA.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  ALLEGAN...SAUGATUCK...FENNVILLE...PLAINWELL...WAYLAND...BENTHEIM...
  BRAVO...CHESHIRE CENTER...CHICORA...CORNING...DIAMOND SPRINGS...
  DUNNINGVILLE...FILLMORE...GREEN LAKE...HOOPER...HOPKINSBURG...
  LEISURE...MONTEREY...NEELEY...NEW RICHMOND...OVERISEL...PEARL...
  PIER COVE...SPRING GROVE AND WATSON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

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.

&&

LAT...LON 4258 8623 4264 8624 4270 8621 4277 8621
      4277 8555 4242 8555 4242 8628

$$

DUKE

2 follow-up statements

900 
WGUS73 KGRR 131857
FFSGRR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
257 PM EDT SAT AUG 13 2011

MIC005-132200-
/O.CON.KGRR.FF.W.0019.000000T0000Z-110813T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ALLEGAN MI-
257 PM EDT SAT AUG 13 2011

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR ALLEGAN COUNTY UNTIL 600
PM EDT...

AT 253 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WITH VERY HEAVY RAINFALL OVER LAKE MICHIGAN 
APPROACHING ALLEGAN COUNTY. RADAR ESTIMATES RAINFALL OF OVER 2 
INCHES WITH THE EARLIER STORMS. THOUGH THE NEXT ROUND OF STORMS IS 
MOVING QUICKLY TO THE EAST... RAINFALL RATES MAY EXCEED A HALF INCH 
PER HOUR.

RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
ALLEGAN...SAUGATUCK...FENNVILLE...PLAINWELL...WAYLAND...BENTHEIM...
BRAVO...CHESHIRE CENTER...CHICORA...CORNING...DIAMOND SPRINGS...
DUNNINGVILLE...FILLMORE...GREEN LAKE...HOOPER...HOPKINSBURG...
LEISURE...MONTEREY...NEW RICHMOND...OVERISEL...PEARL...PIER COVE...
SPRING GROVE AND WATSON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLOODING OF SMALL CREEKS
AND STREAMS...COUNTRY ROADS...NORMALLY DRY WASHES... AS WELL AS
FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS.

&&

LAT...LON 4258 8623 4264 8624 4270 8621 4277 8621
      4277 8555 4242 8555 4242 8628

$$

63

943 
WGUS73 KGRR 132059
FFSGRR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
459 PM EDT SAT AUG 13 2011

MIC005-132114-
/O.CAN.KGRR.FF.W.0019.000000T0000Z-110813T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ALLEGAN MI-
459 PM EDT SAT AUG 13 2011

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR ALLEGAN COUNTY IS
CANCELLED...

EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS
AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO
RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED...
PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY.

LAT...LON 4258 8623 4264 8624 4270 8621 4277 8621
      4277 8555 4242 8555 4242 8628

$$

63

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 12, 11:19 PM EDT	Special Weather Statement	GRR	Lake, Mason, Muskegon, Newaygo, Oceana	116 min
Aug 13, 2:43 AM EDT	Areal Flood Advisory	GRR	Mason, Oceana	6 hr
Aug 13, 5:02 AM EDT	Areal Flood Advisory	GRR	Muskegon	6 hr
Aug 13, 6:23 AM EDT	Areal Flood Advisory	GRR	Newaygo	9 hr
Aug 13, 8:05 AM EDT	Areal Flood Advisory	GRR	Kent	6 hr
Aug 13, 9:31 AM EDT	Special Weather Statement	GRR	Allegan	59 min
Aug 13, 10:37 AM EDT	Special Weather Statement	GRR	Allegan, Kalamazoo, Van Buren	53 min
Aug 13, 10:42 AM EDT	Special Marine Warning	GRR		79 min
Aug 13, 10:53 AM EDT	Severe Thunderstorm Warning	GRR	Van Buren	67 min
Aug 13, 11:35 AM EDT	Small Craft Advisory	GRR		43 hr
Aug 13, 11:39 AM EDT	Flash Flood Warning	GRR	Van Buren	5 hr
Aug 13, 12:46 PM EDT	Special Weather Statement	GRR	Kalamazoo	59 min
Aug 13, 1:06 PM EDT	Severe Thunderstorm Warning	GRR	Kalamazoo, Van Buren	54 min
Aug 13, 1:31 PM EDT	Areal Flood Advisory	GRR	Kalamazoo	5 hr
Aug 13, 2:05 PM EDT	Special Weather Statement	GRR	Calhoun	55 min
Aug 13, 2:08 PM EDT	Special Weather Statement	GRR	Montcalm	67 min
Aug 13, 2:22 PM EDT	Special Marine Warning	GRR		83 min
Aug 13, 2:43 PM EDT	Special Weather Statement	GRR	Kent, Ottawa	92 min
Aug 13, 2:47 PM EDT	Flash Flood Warning	GRR	Newaygo	7 hr
Aug 13, 2:53 PM EDT	Special Weather Statement	GRR	Allegan	82 min
Aug 13, 3:07 PM EDT	Severe Thunderstorm Warning	GRR	Kent, Ottawa	70 min
Aug 13, 3:09 PM EDT	Special Marine Warning	GRR		81 min
Aug 13, 3:10 PM EDT	Special Marine Warning	GRR		77 min
Aug 13, 3:14 PM EDT	Areal Flood Advisory	GRR	Kent, Muskegon, Ottawa	106 min
Aug 13, 3:21 PM EDT	Severe Thunderstorm Warning	GRR	Kent, Ottawa	54 min
Aug 13, 3:32 PM EDT	Special Weather Statement	GRR	Newaygo	58 min
Aug 13, 3:43 PM EDT	Severe Thunderstorm Warning	GRR	Van Buren	65 min
Aug 13, 3:56 PM EDT	Special Weather Statement	GRR	Ionia	64 min
Aug 13, 4:08 PM EDT	Special Weather Statement	GRR	Allegan, Barry	82 min
Aug 13, 4:29 PM EDT	Special Weather Statement	GRR	Kalamazoo	91 min
Aug 13, 4:46 PM EDT	Special Weather Statement	GRR	Calhoun, Eaton	89 min
Aug 13, 5:04 PM EDT	Severe Thunderstorm Warning	GRR	Calhoun, Kalamazoo	64 min
Aug 13, 5:14 PM EDT	Special Weather Statement	GRR	Clinton, Ingham	91 min
Aug 13, 5:17 PM EDT	Areal Flood Advisory	GRR	Newaygo	105 min
Aug 13, 5:35 PM EDT	Severe Thunderstorm Warning	GRR	Jackson	73 min
Aug 13, 6:19 PM EDT	Severe Thunderstorm Warning	GRR	Ingham	30 min
Aug 13, 6:25 PM EDT	Tornado Warning	GRR	Jackson	20 min

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.