Sunrise 6:26 AM   Sunset 8:56 PM Moonrise 5:32 AM   Moonset 9:12 PM

  Print   HELP   Reset   Save   Recall  New

LMZ872 Expires:202405081530;;829485 Fzus63 Kmkx 080740 Glflm
open lake forecast for lake michigan national weather service milwaukee/sullivan wi 240 am cdt Wed may 8 2024
for waters beyond five nautical miles of shore on lake michigan.
waves are provided as a range of significant wave heights, which is the average of the highest 1/3 of the wave, along with the average height of the highest 10% of the waves which will occasionally be encountered.
Synopsis -
low pressure of 29.4 inches over the northern end of lake michigan will exit east toward lake ontario through today. Light to moderate northwesterlies over the northern end of the lake to southwesterlies over the south end of the lake will persist until about mid-day, when a weak trough attached to the low moves from north to south over the lake. Winds behind this trough will come around to northerly and finally northeasterly by the late afternoon to early evening. Northeasterlies will then continue overnight into Thursday as an area of low pressure passes east over the ohio river valley. Gusts to 25 knots may occur over the south half of the lake late Thursday morning into Thursday afternoon.
winds then ease Thursday night as high pressure of 30.0 inches approaches the upper great lakes.
lmz080-669-671-673-675-777-779-870-872-874-876-878-081530- lake michigan from michigan city in to st. Joseph mi 5 nm offshore to mid lake- lake michigan from sheboygan to port washington wi 5 nm offshore to mid lake- lake michigan from port washington to north point light wi 5 nm offshore to mid lake- lake michigan from north point light to wind point wi 5 nm offshore to mid lake- lake michigan from wind point wi to winthrop harbor il 5 nm offshore to mid lake- lake michigan from winthrop harbor to wilmette harbor il 5 nm offshore to mid lake- lake michigan from wilmette harbor il to michigan city in 5 nm offshore to mid lake- lake michigan from whitehall to pentwater mi 5 nm offshore to mid lake- lake michigan from grand haven to whitehall mi 5 nm offshore to mid lake- lake michigan from holland to grand haven mi 5 nm offshore to mid lake- lake michigan from south haven to holland mi 5 nm offshore to mid lake- lake michigan from st. Joseph to south haven mi 5 nm offshore to mid lake- 240 am cdt Wed may 8 2024
sheboygan wi to pentwater mi south - .
Today - Southwest winds 10 to 20 kt veering to northeast. Waves 1 to 3 ft. Tonight - Northeast winds 10 to 20 kt increasing to 15 to 25 kt. Chance of rain showers and slight chance of Thunderstorms overnight. Waves 1 to 3 ft building to 3 to 5 ft. Thursday - Northeast winds 15 to 25 kt becoming north to 30 kt. Showers likely. Waves 4 to 6 ft occasionally to 8 ft building to 5 to 8 ft occasionally to 10 ft. Thursday night - North winds 15 to 25 kt diminishing to 10 to 20 kt. Waves 5 to 8 ft occasionally to 10 ft subsiding to 4 to 6 ft occasionally to 8 ft. Friday - Northwest winds 10 to 20 kt becoming west. Waves 2 to 4 ft. Friday night - South winds 10 to 15 kt becoming southwest 10 to 20 kt. Showers likely. Waves 2 to 4 ft. Saturday - Northwest winds 10 to 20 kt. Waves 1 to 3 ft. Sunday - West winds 10 to 20 kt becoming south. Waves 1 to 3 ft.

LMZ800
No data

FXUS63 KGRR 080750 AFDGRR

Area Forecast Discussion National Weather Service Grand Rapids MI 350 AM EDT Wed May 8 2024

KEY MESSAGES

- Dry and mostly sunny today

- Rain and chance thunderstorm tonight through Thursday

- Showers on Saturday

DISCUSSION
Issued at 350 AM EDT Wed May 8 2024

- Dry and mostly sunny today

The upper-level shortwave trough and surface low associated with yesterday's thunderstorms is scooting east toward New England today, while its former parent low over the Dakotas begins to fill and shear out. There will be a narrow zone of ridging with 500 mb height rises over our area along with drier air moving through, keeping us mostly sunny until clouds increase late in the evening. There should be only a moderate breeze from the west becoming northwest.

- Rain and chance thunderstorm tonight through Thursday

Remnants of the Dakota low phasing with a southward-moving positively tilted trough from northern Ontario are expected to develop a surface low across Illinois-Indiana-Ohio tonight. To its north will be a period of likely rain for much of the day Thursday across southern to central Lower Michigan. Some MUCAPE may be present in southern Michigan which could be enough for some rumbles of thunder. Some questions remain as to the northward extent of a soaking rainfall, and also rainfall totals. HRRR member model mean rain totals suggest 0.5 to 1.0 inch rain totals are most likely (though much less near/north of US-10), however, 1.5 inch totals are possible in some spots.

- Showers on Saturday

Shortwave ridging should bring fair weather for Friday into Friday night but clouds will be moving in after midnight as a shortwave trough approaches, with rain moving back in for Saturday. This trough is less amplified than previous runs but some diurnal enhancement of the showers Saturday afternoon is still possible given the steep lapse rates. Isolated thunderstorms are possible and even some small hail with any deeper updrafts.

Cool air in northerly flow on the back side of the sfc low results in low temperatures in the upper 30s to lower 40s Saturday night with scattered frost potential in the colder outlying areas.

The trough moves east on Sunday but there is low confidence with forecast details next week, although there is model agreement on a longwave trough forming across the central/eastern CONUS by late in the week.

AVIATION /06Z TAFS THROUGH 06Z THURSDAY/
Issued at 132 AM EDT Wed May 8 2024

VFR conditions will prevail through Wednesday afternoon with winds turning northwest around 10 knots.

MARINE
Issued at 350 AM EDT Wed May 8 2024

West winds becoming north later today are not expected to pose a hazard on Lake Michigan. East-northeast winds Thursday morning may gust over 20 knots Thursday morning. As winds become north later on Thursday, some larger waves may peel toward the shore from the stronger midlake wind field. Essentially, could be marginally hazardous for small craft on Thursday, not to mention the chance of lightning.

GRR WATCHES/WARNINGS/ADVISORIES
MI...None.
MARINE...None.

toggle option: (graph/table)

Full Color Weather Map

Link to Loop


Other links: GEOS-West     Contential US     Full GOES-East

Grand Rapids/Muskegon, MI,