Marine Weather and Tides
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|Sunrise 6:20AM||Sunset 9:20PM||Thursday July 18, 2019 1:08 PM EDT (17:08 UTC)||Moonrise 9:45PM||Moonset 6:53AM||Illumination 97%|
7 Day Forecast for Marine Location Near Saugatuck, MIHourly EDIT Help
Area Discussion for - Grand Rapids, MI  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus63 kgrr 181540|
area forecast discussion
national weather service grand rapids mi
1140 am edt Thu jul 18 2019
Issued at 1140 am edt Thu jul 18 2019
updated the forecast for pops, clouds, winds and temperatures.
Extensive cloud cover and scattered showers and storms should
persist through the afternoon as indicated by satellite and radar
loops along with latest short range model guidance. Kept the
headlines unchanged although it is looking like heat warning and
advisory criteria may not be met today.
South to southeast wind gusts in the coastal zones to 30 knots or
higher late this morning will spread inland the next few hours as
indicated by mesoscale models as a wake low over wisconsin has
formed behind the mcs.
Issued at 318 am edt Thu jul 18 2019
- a band of storms expected to swing through the great lakes this
morning, but present indications are the strongest parts will
remain to our southwest.
- thunderstorms with heavy rain are expected tonight and again
Saturday night with a localized flooding threat.
- oppressive heat is expected late this afternoon through
Saturday, especially along and south of i-96.
- much calmer and cooler conditions are expected from Sunday
Discussion (today through next Wednesday)
issued at 318 am edt Thu jul 18 2019
robust elevated thunderstorms continue along nose of a low-level jet
in northern iowa and southern minnesota with subtle but increasing
signs of a consolidating cold pool and forward-propagating
elements. As the cold pool continues to deepen this morning, a
more dominant east southeasterly track will become established
with the MCS propagating into central wisconsin by sunrise. By
that point in time, the system may become surface-based and
intensify owing to boundary layer destabilization presenting the
risks for gusty winds, torrential rainfall, and cloud to ground
lightning. The only question at this point is just where the mcs,
at least strongest portion, will go. The ultimate track will
depend on the intrinsic details of the MCS itself, though our
hunch is the strongest part will probably track southwest of lower
michigan and through the chicago metro area giving our area a
band of showers with embedded thunder. At least abundant cloud
cover is a good bet from this morning through early afternoon, but
clearing skies by late afternoon in tandem with southerly flow
(enhanced by a wake low?) will turn on the sauna and boost heat
indices into the mid to upper 90s by dinnertime.
Tonight, the low-level jet will redevelop (perhaps a smidge stronger
than this morning) and take aim at central wisconsin to western
lower michigan. The position of the outflow boundary from convection
today will determine the location of renewed convective development
tonight (e.G. Isentropic ascent atop the residual low-level cold
pool), with a greater signal for heavy rainfall across central
wisconsin than western lower michigan. The activity may end up
further south than models currently advertise given the expected
track of the MCS this morning. Regardless, with pwats progged to
climb above 2" and a low-level jet pointing right toward our area,
there is growing concern for a swath of healthy rainfall totals
(>2") with localized flooding across western lower michigan.
Convection may continue into the daylight hours Friday, leaving|
behind an outflow boundary (e.G. Effective front) somewhere in
central lower michigan.
South of the effective front, oppressive heat is expected Friday and
Saturday with highs in the mid (to upper?) 90s, lows in the mid to
upper 70s, and MAX heat indices in the lower 100s. Along and north
of the front is more of a wild card (especially considering the
potential for diurnal convection and perhaps even a random mcs).
However, confidence is reasonably high that areas along and south of
i-96 will experience the worst conditions with a prolonged period of
oppressive heat and humidity. All things considered and in
collaboration with iwx dtx, we opted to issue an excessive heat
warning along and south of i-96 and a heat advisory to the north,
but the message across all of southern lower michigan is the same:
limit your time and strenuous activities outdoors, drink plenty of
fluids, and check in on your neighbors and loved ones.
A cold front will swing through Saturday night and put an end to
our brief heat wave. However, considerable post-frontal convection
may lead to a period of heavy rainfall into Sunday morning,
prompting the introduction of a marginal risk for excessive
rainfall from the weather prediction center (wpc). Should the same
area get hit repeatedly from this morning through early Sunday
morning, rainfall totals may get out of hand with flooding of
roadways and low-lying areas. As such, we've issued a hydrologic
outlook (esf) to message the potential for localized flooding.
Forecast deterministic and ensemble model guidance is in fair
agreement that Sunday onward will be much more comfortable and
drier as somewhat persistent troughing develops across the eastern
half of the united states.
Aviation (for the 12z tafs through 12z Friday morning)
issued at 749 am edt Thu jul 18 2019
showers and tstms currently in wi expected to move through from
mid morning through mid afternoon, leading to ocnl MVFR or lower
vsbys in rain. After this batch moves through, confidence is low
as to timing coverage of later convection. Have played it as a
lull from mid afternoon through mid evening, with re-newed
nocturnal low level jet convection develop toward midnight.
Issued at 318 am edt Thu jul 18 2019
thunderstorms are expected late this morning and again early Friday
morning with gusty winds and frequent cloud to water lightning.
South to southwesterly winds this afternoon through Friday will lead
to 3-5 ft waves thereby making conditions hazardous to boaters and
swimmers alike, mainly north of holland. Given the high water
levels, minor beach erosion is also possible mainly on the southern
sides of the points. Another chance for thunderstorms will arrive
late Saturday, after which calmer conditions will prevail into early
Grr watches warnings advisories
Mi... Excessive heat warning until 8 pm edt Saturday for miz056>059-
Beach hazards statement through Friday evening for miz037-043-
Heat advisory until 8 pm edt Saturday for miz037>040-043>046-
Lm... Small craft advisory until 8 pm edt Friday for lmz846>849.
Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
|Stations||Dist||Age||Wind||Air Temp||Water Temp||Waves||Pressure||DewPt|
|45029||19 mi||38 min||SW 9.7 G 12||72°F||72°F||2 ft||1013.5 hPa||68°F|
|HLNM4 - 9087031 - Holland, MI||23 mi||62 min||W 14 G 17||73°F||76°F||1014.5 hPa||71°F|
|45007 - S MICHIGAN 43NM East Southeast of Milwaukee, WI||24 mi||38 min||SSW 9.7 G 12||70°F||70°F||1015 hPa||70°F|
|45161||28 mi||68 min||SSW 14 G 18||72°F||73°F||1 ft||1012.1 hPa (+0.6)|
|MKGM4 - Muskegon, MI||31 mi||38 min||SW 37 G 41||73°F||1008.8 hPa||71°F|
|45168||34 mi||38 min||W 7.8 G 9.7||73°F||75°F||2 ft||1015 hPa||69°F|
|SVNM4 - South Haven, MI||35 mi||38 min||W 9.9 G 11||73°F|
|SJOM4 - St. Joseph, MI||52 mi||68 min||NW 8.9 G 13||74°F||1016.9 hPa (+3.0)|
Wind History for Holland, MI(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Holland - West Michigan Regional Airport, MI||29 mi||75 min||WNW 8||4.00 mi||Light Rain Fog/Mist||75°F||72°F||90%||1014.4 hPa|
Wind History from BIV (wind in knots)
|1 day ago||SW||W||W||W||W||W||NW||Calm||Calm||Calm||Calm||Calm||Calm||Calm||N||Calm||Calm||Calm||E||E|
|2 days ago||SW||SW||W||SW||SW|
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GOES Local Image of GreatLakes EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop
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Wind Forecast for Grand Rapids, MI (13,3,4,5)(on/off)  Help
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