Area Forecast Discussion
Issued by NWS Detroit/Pontiac, MI
Issued by NWS Detroit/Pontiac, MI
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890 FXUS63 KDTX 271759 AFDDTX Area Forecast Discussion National Weather Service Detroit/Pontiac MI 159 PM EDT Mon May 27 2024 .KEY MESSAGES... - Additional showers and a few thunderstorms return to the area tonight and Tuesday as unsettled conditions persist. _ There remains a chance of showers Tuesday night into Wednesday, before drier conditions return to finish the work week. - Temperatures will remain near to below average throughout the midweek period. && .AVIATION... Lake enhanced moisture has filled in across SE MI in the wake of a departing low pressure system which will support mvfr cigs through the day. A strong low-level jet will also increase in strength through the afternoon and evening hours and will be oriented west to east over southern Michigan. Shallow mixing depths will be able to tap into these stronger winds aloft, bringing wind gusts up to 25-30 knots for the remainder of the daylight hours. The Metro terminals will be most susceptible to the gusts up to 30 knots given the position of the jet. Otherwise, the more likely chance for rain showers will enter late tonight as an upper-level trough moves through. The better forcing will be found across KMBS to KFNT, where a TEMPO group has been introduced for rain chances. For DTW/D21 Convection...Thunderstorms are unlikely today, but a chance for thunderstorms will return tomorrow afternoon. Confidence in coverage and timing is too low to include in the TAFs at this time. DTW THRESHOLD PROBABILITIES... * High in ceilings aob 5000 feet today and tonight. * Low in crosswind thresholds being exceeded this afternoon and evening. && .PREV DISCUSSION... Issued at 309 AM EDT Mon May 27 2024 DISCUSSION... Scattered showers and a few thundestorms will pivot through the area this morning as an upper level shortwave and associated low pressure lifts into northern lower MI and a cold front wraps west to east through the area. Mainly dry conditions are expected for much of the afternoon with gusty westerly winds as the cooler air is ushered in behind the front. Showers will pivot back southeast into the area this evening into tonight and persist into Tuesday as this upper level system opens and shifts back through the area on its way to the eastern Great Lakes. A fast moving Pacific shortwave will merge with this MI system tonight and help re-invigorate the rain shower potential to some degree and will increase pops just a bit overnight into early Tuesday. In the meantime, an upper low pressure system positioned east of Lake Winnipeg will pivot southeast into the area in the wake of both of these merging upper waves from Tuesday into Tuesday night. This will result in a continuation of unsettled weather with periodic scattered showers into early Wednesday. As the colder upper level core of this northern stream system works over the area, instability will increase enough to warrant a thunderstorm mention as well. While this will be most prevalent during peak heating from Tuesday afternoon into early evening, a small chance of a thunderstorm or two will persist overnight Tuesday night into early Wednesday as the upper low/trough crosses the area. Thereafter, upper ridging will expand into the area late this week once the upper trough that results from these various shortwaves shifts off to the east. This will bring dry conditions from late Wednesday on through at least Friday with temperatures gradually moderating from the mid 60s to lower 70s in the Tuesday-Thursday time frame back into the middle 70s by Friday. By next weekend, the surface high pressure system that coincides with the upper level ridge will shift off to the southeast with south to southwest flow becoming established over the area. This will lead to further warming with high temperatures into the upper 70s to lower 80s. By this point in the forecast, the next stream of Pacific origin shortwaves begin to impact the Great Lakes and this brings a return of at least scattered/widely scattered shower and thunderstorm chances. MARINE... After a lull in winds early today, expect southwest to west winds to increase again this afternoon into tonight as a cold front pivots east through the area around low pressure to the north. Small Craft Advisories are in effect in anticipation for this increase in wind speed with wave heights responding as well. These gusty conditions will be slow to subside over Saginaw Bay and the tip of the Thumb where an advisory will continue into Tuesday. Cooler and unsettled conditions will prevail into midweek with periodic showers and a stray thunderstorm possible into Tuesday night as a secondary upper level disturbance sweeps southeast across the central Great Lakes in the wake of the current low pressure as it moves off to the east. HYDROLOGY... Periodic scattered showers and a few thunderstorms will impact the region into Tuesday night and early Wednesday. Additional rainfall will generally remain light to occasionally moderate. However, a few localized downpours early this morning may bring one quarter of an inch of rain to some locations. Otherwise, the highest precipitation totals of one quarter to one half an inch from tonight into Tuesday night and Wednesday morning will focus especially over the Saginaw Valley and Thumb regions with perhaps one to two tenths of an inch possible further south. Rises on local rivers associated with Sunday evening rainfall will peak and subside today into tonight with this additional early week rainfall having little to no additional impact. && .DTX WATCHES/WARNINGS/ADVISORIES... MI...None. Lake Huron...Small Craft Advisory until 4 AM EDT Tuesday for LHZ442-443. Small Craft Advisory until 4 PM EDT Tuesday for LHZ421-422-441. Lake St Clair...Small Craft Advisory until 4 AM EDT Tuesday for LCZ460. Michigan waters of Lake Erie...Small Craft Advisory until 4 AM EDT Tuesday for LEZ444. Low Water Advisory until 11 PM EDT this evening for LEZ444. && $$ AVIATION.....AM DISCUSSION...DG MARINE.......DG HYDROLOGY....DG You can obtain your latest National Weather Service forecasts online at www.weather.gov/detroit.