Sunrise 5:37 AM   Sunset 7:50 PM Moonrise 3:52 AM   Moonset 3:53 PM

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LMZ080 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- 248 Am Cdt Sat May 4 2024
sheboygan wi to pentwater mi south - .
Today - East winds 10 to 20 kt becoming southeast. Waves 1 to 2 ft. Tonight - South winds 10 to 15 kt veering to west 10 to 20 kt late in the evening, then becoming northwest after midnight increasing to 15 to 25 kt late. Chance of rain showers and Thunderstorms in the evening, then slight chance of rain showers and Thunderstorms overnight. Waves 1 to 3 ft building to 2 to 4 ft. Sunday - Northwest winds 15 to 25 kt becoming north 10 to 20 kt. Waves 3 to 5 ft. Sunday night - Northeast winds 10 to 20 kt diminishing to 5 to 10 kt overnight. Waves 2 to 4 ft subsiding to 1 to 3 ft. Monday - East winds 10 to 15 kt increasing to 10 to 20 kt. Waves 2 to 4 ft. Monday night - East winds 10 to 15 kt becoming southeast 10 to 20 kt. Waves 2 to 4 ft building to 3 to 5 ft. Tuesday - Southeast winds 15 to 25 kt becoming south. Showers with a chance of Thunderstorms. Waves 4 to 6 ft occasionally to 8 ft. Wednesday - Southwest winds 10 to 20 kt becoming south. Waves 1 to 3 ft.

LMZ005
No data

FXUS63 KIWX 040921 AFDIWX

Area Forecast Discussion National Weather Service Northern Indiana 521 AM EDT Sat May 4 2024

KEY MESSAGES

- Active weather pattern for this week, with chances for showers and storms every day. The best chances will be Tuesday into Thursday when a stronger low pressure system moves through the area. A few strong to severe storms are possible Tuesday afternoon into Wednesday, but confidence is low at this time.

- Temperatures linger in the 70s and low 80s through most of the week, except Sunday when highs north of US 24 will be in the 50s and 60s, coldest near Lake Michigan. Next weekend lows will be in the 60s.

DISCUSSION
Issued at 458 AM EDT Sat May 4 2024

Mostly dry today as a weak surface high lingers in place, with mid level ridging breaking down somewhat late this afternoon thanks to an approaching trough. There is a stationary front settled just to the southeast of our CWA, oriented from roughly southern Ontario southwest towards Lima, OH and down into Saint Louis, MO. This will be a focus for shower activity, maybe a few storms, into the afternoon-with the best chances after 18z as we build up some instability. Going by the NAM, it looks like we'll have around 500- 1000 J/kg of sfc based CAPE by 21z largely east of I 69 (more like 200-500 J/kg west), in addition to weak moisture advection from the southeast and mid level lapse rates of around 7 C/km. We have a subsidence inversion to overcome and weak forcing overall, but felt 20-30 percent pops were warranted for the east. Luckily the bulk effective shear for the afternoon time period is less than 20 knots, so if any storms develop, don't expect much in the way of severe weather. Otherwise, expect partly to mostly sunny skies with increasing clouds towards the evening. Highs will be in the 70s.

Late this afternoon into tonight, a surface low and mid level trough will move through, bringing better chances for rain and some storms that dwindle with eastward progression. SPC Day 1 outlook has all of our area in general thunder, with the marginal risk for severe weather to the west of our CWA associated with the system, where wind shear is more on the order of 25-35 knots and the cold front is moving through during more favorable time of day. For us, the shear weakens to about 20-30 knots, with waning instability-so while I have higher pops west tonight (40-60 percent) I dropped them off to 20-35 percent further east with lesser chances for thunder. Severe weather is not expected at this time. Lows will be in the 50s and 60s, warmest inland from Lake Michigan.

Isolated/scattered showers & storms will persist east of I 69 through Sunday evening-largely associated with the slowly exiting cold front. Again, minimal shear with around 500-1000 J/kg of sfc based CAPE by Sunday afternoon in the east warrants 20-30 percent pops, however, severe weather is unlikely. Highs will be in the 50s and 60s north of US 24 (coldest near Lake MI) and the low to mid 70s south. Otherwise, expect partly to mostly sunny skies.

For most areas, Sunday night into late Monday night will be dry thanks to an amplifying mid level ridge and an expansive surface high sprawling over the Great Lakes. A low pressure system approaching from the southwest Monday afternoon and evening will bring increasing chances for showers and maybe a few thunderstorms south of US 24, but confidence is low (it could miss us to the south all together). Highs will be in the upper 60s and low to mid 70s.

Tuesday into Wednesday will be the best shot at more significant precipitation and even thunderstorm chances. An upper level low dives into the north central CONUS and develops a surface low somewhere over IA/MO/KS Tuesday afternoon, lifting it through the Great Lakes as it deepens. The low is forecast to reach southern Ontario roughly Wednesday evening. The warm front moves through Tuesday, followed by the cold front on Tue Night/Wed Am, with decent moisture transport out ahead of the low. Kept the 50-90 percent chances Tuesday into Tuesday night, with thunderstorms likely. I suspect that we have potential for severe weather if this pans out as the models currently suggest, with 40-65 knots of bulk effective shear and 500-1500 J/kg surface based cape by Tuesday afternoon/evening. At this time, we are in the 15 percent for the western half of the CWA for the Day 4 SPC outlook, and think it's definitely worth monitoring.

The upper low over the central CONUS will gradually migrate eastward into the Great Lakes by Friday afternoon, lingering through the weekend and bringing additional chances for showers and storms, particularly Thursday. A secondary low develops behind the Tue/Wed system in much the same location, drifting over the forecast area through the day and bringing potentially heavy rain-but too far out to add much detail at this point (we are in the WPC Excessive Rainfall Outlook Marginal Category for Wed/Thu).
Temperatures linger in the 70s and low 80s until the weekend, when we cool into the 60s for highs (40s and 50s for lows).

AVIATION /12Z TAFS THROUGH 12Z SUNDAY/
Issued at 520 AM EDT Sat May 4 2024

Latest satellite/ob trends showing stratus (IFR-MVFR) and fog expanding just east of KFWA, and another smaller area advecting west toward KSBN. Low confidence on if and how long this impacts the terminals early this morning. This lingering boundary layer moisture will allow for a high MVFR to low VFR stratocu deck to settle in otherwise mid morning into the afternoon, especially at KFWA. Models do try to generate isolated showers in the vicinity of KFWA later this afternoon as weak surface based buoyancy develops on the western fringe of a stalled OH trough. However, point chances are too low for a mention in the TAF. A sfc trough does approach KSBN tonight (3-6z Sun) with non-zero chances for decaying showers to move through.

IWX WATCHES/WARNINGS/ADVISORIES
IN...None.
OH...None.
MI...None.
MARINE...None.

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