Alert archive / Michigan / Beach Hazards Statements in 2016

Beach Hazards Statement 15, NWS Grand Rapids, MI

July 25, 2016Allegan County, Ottawa County, Van Buren County, Michigan

NWS Grand Rapids, MI issued this beach hazards statement at Jul 25, 2016, 5:15 AM EDT for Allegan County, Ottawa County, Van Buren County, Michigan. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued
Jul 25, 2016, 5:15 AM EDT (09:15 UTC)
Expired
Jul 25, 2016, 12:00 PM EDT
In force
7 hr
Issued by
NWS Grand Rapids, MI

Counties Allegan County, MI, Ottawa County, MI, Van Buren County, MI

The radar

The Grand Rapids radar (KGRR), 58 km from the middle of the area, began a volume at 09:19 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 00:00Z, 9.3 hours before the alert went out and 221 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 00:00Z on 2016-07-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1605 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 00:00Z on 2016-07-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 200 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
1605 J/kg
Mixed-layer CIN
-52 J/kg
Mixed-layer LCL
967 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
200 m²/s²
0-3 km storm-relative helicity
236 m²/s²
Significant tornado parameter
0.9
Supercell composite
8.4

Open this sounding in Storm Lab

The text

As transmitted.

513 
WHUS43 KGRR 250915
CFWGRR

COASTAL HAZARD MESSAGE
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
515 AM EDT MON JUL 25 2016

MIZ056-064-071-251600-
/O.NEW.KGRR.BH.S.0015.160725T0915Z-160725T1600Z/
OTTAWA-ALLEGAN-VAN BUREN-
515 AM EDT MON JUL 25 2016

...BEACH HAZARDS STATEMENT IN EFFECT UNTIL NOON EDT TODAY...

THE NATIONAL WEATHER SERVICE IN GRAND RAPIDS HAS ISSUED A BEACH
HAZARDS STATEMENT...WHICH IS IN EFFECT UNTIL NOON EDT TODAY. 

* HIGH WAVE ACTION... STRONG CURRENTS AND DANGEROUS SWIMMING 
  CONDITIONS EXPECTED.

* STRONG STRUCTURAL CURRENTS EXPECTED.

* STRONG LONGSHORE CURRENTS EXPECTED.

* RIP CURRENTS EXPECTED.

* LOCATION...BEACHES FROM ST. JOSEPH TO GRAND HAVEN

* BEACHES WITH PARTICULARLY DANGEROUS CONDITIONS TODAY INCLUDE... 


  SOUTH BEACH IN SOUTH HAVEN... 
  GRAND HAVEN STATE PARK... 

* OVERVIEW/POTENTIAL IMPACTS...SOUTHWEST WINDS OF 15 TO 25 MPH
  WILL SUPPORT A PERIOD OF WAVES OF 3 TO 5 FEET TO START THE DAY.
  BY NOON CONDITIONS SHOULD BECOME LESS HAZARDOUS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HIGH WAVE ACTION MAKES SWIMMING DIFFICULT AND CAN TIRE EVEN A
STRONG SWIMMER QUICKLY. 

STRUCTURAL CURRENTS FORM ALONG PIERS WHERE LONGSHORE CURRENTS AND
WAVE ACTION FLOW INTO THE STRUCTURE. STRUCTURAL CURRENTS CAN
SWEEP YOU OUT INTO DEEPER WATER ALONG THE PIER STRUCTURE.

A LONGSHORE CURRENT IS A LAKE CURRENT THAT MOVES PARALLEL TO
SHORE. LONGSHORE CURRENTS CAN BE STRONG ENOUGH TO PREVENT
SWIMMERS FROM BEING ABLE TO KEEP THEIR FEET ON THE BOTTOM...
MAKING IT DIFFICULT TO RETURN TO SHORE.

RIP CURRENTS ARE POWERFUL CHANNELS OF WATER FLOWING QUICKLY AWAY
FROM SHORE...WHICH OCCUR MOST OFTEN AT LOW SPOTS OR BREAKS IN
SANDBARS. RIP CURRENTS CAN SWEEP YOU INTO DEEPER WATER.

&&

$$


WEATHER.GOV/GRR
1 follow-up statement
327 
WHUS43 KGRR 251600
CFWGRR

COASTAL HAZARD MESSAGE
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
1200 PM EDT MON JUL 25 2016

MIZ056-064-071-251700-
/O.CAN.KGRR.BH.S.0015.000000T0000Z-160725T1600Z/
OTTAWA-ALLEGAN-VAN BUREN-
1200 PM EDT MON JUL 25 2016

...BEACH HAZARDS STATEMENT IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN GRAND RAPIDS HAS CANCELLED THE
BEACH HAZARDS STATEMENT. 

WAVE HEIGHTS HAVE SUBSIDED TO 2 TO 4 FEET AND WILL DIMINISH
FURTHER LATE THIS AFTERNOON. THEREFORE THE BEACH HAZARDS STATEMENT
HAS BEEN CANCELLED.

$$


WEATHER.GOV/GRR

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 24, 11:51 PM EDTSpecial Weather StatementGRRGratiot39 min
Jul 25, 2:06 AM EDTSpecial Weather StatementGRRJackson39 min
Jul 25, 5:16 AM EDTSmall Craft AdvisoryGRR7 hr

Nearby

Beach Hazards Statements in Michigan, 2016Every beach hazards statement 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.