Alert archive / Michigan / Beach Hazards Statements in 2017

Beach Hazards Statement 8, NWS Grand Rapids, MI

July 14, 2017Allegan County, Ottawa County, Van Buren County, Michigan

NWS Grand Rapids, MI issued this beach hazards statement at Jul 14, 2017, 7:43 PM EDT for Allegan County, Ottawa County, Van Buren County, Michigan. It took effect at Jul 14, 2017, 8:00 PM EDT. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Jul 14, 2017, 7:43 PM EDT (23:43 UTC)
In effect from
Jul 14, 2017, 8:00 PM EDT
Expired
Jul 14, 2017, 11:00 PM EDT
In force
3 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 23:44 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, 11.7 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 12:00Z on 2017-07-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 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 2017-07-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -27 square meters per square second.1939587897Sfc1 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
4 J/kg
Mixed-layer CIN
-34 J/kg
Mixed-layer LCL
737 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
-27 m²/s²
0-3 km storm-relative helicity
9 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

232 
WHUS43 KGRR 142343
CFWGRR

COASTAL HAZARD MESSAGE
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
743 PM EDT FRI JUL 14 2017

MIZ056-064-071-150300-
/O.NEW.KGRR.BH.S.0008.170715T0000Z-170715T0300Z/
OTTAWA-ALLEGAN-VAN BUREN-
743 PM EDT FRI JUL 14 2017

...BEACH HAZARDS STATEMENT IN EFFECT UNTIL 11 PM EDT THIS
EVENING...

THE NATIONAL WEATHER SERVICE IN GRAND RAPIDS HAS ISSUED A BEACH
HAZARDS STATEMENT...WHICH IS IN EFFECT UNTIL 11 PM EDT THIS
EVENING. 

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

* STRONG STRUCTURAL CURRENTS EXPECTED.

* STRONG LONGSHORE CURRENTS EXPECTED. 

* RIP CURRENTS POSSIBLE. 

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

BEACHES WITH PARTICULARLY DANGEROUS CONDITIONS INCLUDE... 


  NORTH BEACH IN SOUTH HAVEN...
  HOLLAND STATE PARK... 



* OVERVIEW/POTENTIAL IMPACTS...NORTH WINDS WILL KEEP THE WAVES
  RUNNING AROUND 4 FEET THROUGH 10 PM...BUT THEY WILL DIMINISH
  LATER THIS EVENING. 

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
883 
WHUS43 KGRR 150313
CFWGRR

COASTAL HAZARD MESSAGE
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
1113 PM EDT FRI JUL 14 2017

MIZ056-064-071-150415-
/O.EXP.KGRR.BH.S.0008.000000T0000Z-170715T0300Z/
OTTAWA-ALLEGAN-VAN BUREN-
1113 PM EDT FRI JUL 14 2017

...BEACH HAZARDS STATEMENT HAS EXPIRED...

THE WAVES HAVE FALLEN TO UNDER 4 FEET...LIMITING THE RISKS.
AS A RESULT THE HAZARD WAS ALLOWED TO EXPIRE.

$$


WEATHER.GOV/GRR

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 14, 7:39 PM EDTSmall Craft AdvisoryGRR3 hr

Nearby

Beach Hazards Statements in Michigan, 2017Every beach hazards statement in 2017

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.