Sunrise 5:47 AM   Sunset 7:50 PM Moonrise 1:08 AM   Moonset 9:39 AM

  Print   HELP   Reset   Save   Recall

LMZ741 Expires:202404300930;;349752 Fzus53 Klot 300246 Nshlot
nearshore marine forecast national weather service chicago/romeoville il 946 pm cdt Mon apr 29 2024
for waters within 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 waves, along with the average height of the highest 10 percent of the waves which will occasionally be encountered.
lmz740>742-300930- winthrop harbor to wilmette harbor il- wilmette harbor to northerly island il- northerly island to calumet harbor il- 946 pm cdt Mon apr 29 2024
Rest of tonight - West winds 15 to 20 kt diminishing to around 10 kt. Mostly cloudy late in the evening then clearing. Waves around 1 ft. Tuesday - West winds 5 to 10 kt becoming southeast 10 to 15 kt in the afternoon. Mostly Sunny. Waves 1 ft or less. Tuesday night - Southeast winds 10 to 15 kt becoming south overnight. Slight chance of showers overnight. Waves 1 to 2 ft.Wednesday - Southwest winds 10 to 15 kt becoming northwest in the afternoon. Partly cloudy. Waves 1 to 2 ft.

LMZ700
No data

FXUS63 KLOT 292324 AFDLOT

Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 624 PM CDT Mon Apr 29 2024

KEY MESSAGES

- Chance (30%) of showers through sunset.

- After a break on Tuesday, a stormy pattern returns for a period midweek along with continued unseasonably warm temperatures.

DISCUSSION
Issued at 252 PM CDT Mon Apr 29 2024

Through Tuesday Night:

A cold front will move across the area late this afternoon into early this evening with a chance of showers through sunset, ending from west to east with the cold front. Instability is weak but an isolated thunderstorm is possible generally east of I-57. Southwest winds will slowly turn westerly and remain gusty to 30 mph through sunset and then will quickly diminish.

Quiet and dry weather is expected tonight and Tuesday. Lows in the 40s for most areas tonight, lower 50s in Chicago. Highs will rebound well into the 70s for Tuesday with a lake breeze expected, which will likely move inland in the late afternoon and early evening before dissipating, turning temps cooler behind it.

Another cold front will move across the area Tuesday night.
Convection is expected to develop Tuesday afternoon well west of the local area and spread into the area in the late evening and overnight but in a weakening/dissipating phase. Much of the guidance keeps the eastern half of the area completely dry now.
Lowered pops for Tuesday night and if current trends continue, much of the area may remain dry. cms

Wednesday through Monday:

Dry and mild weather is expected for Wednesday, with high temperatures expected to be in the 70s. However, cooler conditions are likely to develop along the Lake Michigan shores late in the day as the winds will turn east-northeasterly with the approach of backdoor cold front. This cold front will ultimately shift back northward across far northern IL into southern WI as a warm front on Thursday in response to the next wave of low pressure tracking northeastward into the Upper Midwest. As this occurs, increasing warm air advection over the front may foster the development of scatted elevated showers and storms over parts of northern IL late Wednesday night into Thursday morning. The focus for these storms should then shift northward into WI with the warm front into Thursday afternoon, thus leaving our area in the breezy warm sector. Breezy south winds (gusting 30 to 35 mph) Thursday afternoon could push temperatures into the lower to mid 80s for highs.

The parent surface low is expected to occlude late Thursday night as it shifts northward into northern MN and far southwestern Ontario. As it does so, the attendant surface cold front will slide eastward into our area late Thursday night into Friday. An additional period of showers and thunderstorms is likely to accompany this front, with the highest chances (60%+ chances) coming Thursday night through Friday morning. We will need to continue to monitor the potential for any hydrologic concerns during this time frame given the recent rainfall and that precipitable water values near or in excess of 1.5" (near- record values for this time of year here, per DVN and ILX sounding climatology) are progged to be drawn northward out ahead of the cold front. A north-northeastward storm movement could also result in a period of training cells along the cold frontal boundary, which may lead to some narrow corridors of enhanced rainfall and possible flooding.

In the wake of the cold frontal passage, temperatures are favored to return closer to normal going into the weekend before another warm-up appears to be on the horizon going into next week.

KJB

AVIATION /00Z TAFS THROUGH 06Z TUESDAY/
Issued at 612 PM CDT Mon Apr 29 2024

Aviation Key Messages:

- Cold front moves through this evening with a shift to west winds, which persist into Tuesday. Wind shift to southeast then expected toward Tuesday evening.

Surface low pressure was lifting northeast across the upper peninsula of MI early this evening, with a cold front trailing through IL. This front, which just moved through KRFD, will continue to push east across the Chicago terminals by 02Z.
Breezy southwest winds ahead of the front will shift westerly behind it, and may remain briefly gusty before settling to less than 10 kts overnight into midday-Tuesday. Weak surface high pressure will drift east across the area Tuesday afternoon, while another area of low pressure develops into the mid and upper Missouri River Valley Tuesday afternoon. This will allow winds to back south-southeasterly late in the day/toward evening, which be aided by a lake breeze which should affect KORD and KMDW. Winds should remain southeast Tuesday evening, then eventually turn more southerly again toward midnight.

The last of the spotty light showers have moved out of the area at TAF issuance time, with only KGYY still reporting an MVFR ceiling which should lift to VFR shortly. VFR conditions are otherwise expected through the period, though thickening mid- level clouds are expected Tuesday night and a few showers are possible just beyond the end of the current TAF period.

Ratzer

LOT WATCHES/WARNINGS/ADVISORIES
IL...None.
IN...None.
LM...None.

toggle option: (graph/table)

Full Color Weather Map

Link to Loop


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

Chicago, IL,