Area Forecast Discussion
Issued by NWS Marquette, MI
Issued by NWS Marquette, MI
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292 FXUS63 KMQT 080525 AFDMQT Area Forecast Discussion National Weather Service Marquette MI 125 AM EDT Wed May 8 2024 .KEY MESSAGES... -Rain showers this afternoon and tonight to bring half an inch to an inch of rainfall to the area. Thunder chances are low, but are most likely (15-30%) along the MI/WI state line. - Multiple passing low pressure systems will keep rain chances in the forecast into early next week. && .SHORT TERM /THROUGH TONIGHT/... Issued at 242 PM EDT Tue May 7 2024 GOES-16 Day Cloud Phase imagery shows high cirrus over the eastern UP and east half of Lake Superior while a cumulus deck moves over the remainder of the region along with weakly convective shower activity along the MI/WI state line. RAP analysis shows a 984 mb low pressure over the ND/SD state line that is vertically stacked and not moving much over the past 3 hours. Rotating around the upper low are shortwaves that are supporting a now- occluded front which is pushing into the UP and causing the shower activity. CAMs show this shower activity overspreading the UP throughout the afternoon and evening. The QPF forecast has gone up a bit with the most recent run of the HREF, with the central UP now seeing slightly over 50% probabilities of an inch of rainfall compared to around 2/3 of an inch at the same probability the last couple of runs. Mean MUCAPE values are still meager, peaking at only around 100 J/kg along the MI/WI state line so the ~15% chance of thunderstorms remains the prevailing forecast along with no severe weather expected. RHs fell into the 20s and 30s ahead of the occluded front in the central and eastern UP this afternoon along with wind gusts around 25 mph, but with cirrus overrunning the region preventing RHs from falling further, expected reductions in wind with time, and the arrival of showers within the next 6 hours, fire weather concerns are low. && .LONG TERM /WEDNESDAY THROUGH TUESDAY/... Issued at 307 PM EDT Tue May 7 2024 Upper air pattern consists of a closed 500 mb low over South Dakota 12z Wed which moves into the upper Great Lakes 12z Thu. A shortwave over northern Saskatchewan 12z Thu dives southeast into the upper Great Lakes late Fri. Get a glancing blow from a shortwave to the south on Thu, otherwise pcpn ends by Wed afternoon. In the extended, the GFS and ECMWF show a 500 mb trough and closed low in the desert sw, a deep trough in the ern U.S. 12z Sat. The trough in the ern U.S. moves to the east 12z Sun with more shortwave energy poised to come into the area with a shortwave over Manitoba. This shortwave dives into the upper Great Lakes 12z Mon and into the lower Great Lakes 12z Tue. Temperatures look to be warming to above normal this forecast period with an active pattern of alberta clipper type systems moving through. One on Saturday, one Sunday. Looks unsettled for this forecast period with some fronts nearby, but no real strong systems to bring widespread rain at this point. && .AVIATION /06Z TAFS THROUGH 06Z THURSDAY/... Issued at 125 AM EDT Wed May 8 2024 Main band of showers rotating back into the area from the east for the overnight with only SAW probably seeing steady rain from these showers. Expect conditions to lower to MVFR and then IFR overnight at SAW and IWD in showers as an upslope n-ne flow develops on the backside of the associated sfc low moving toward the Straits later tonight. CMX also has a good chance to see a period showers and MVFR cigs early overnight, but then expect CMX to improve to VFR late tonight (08Z or after) and continuing into Wednesday as a downslope ne flow develops there. Conditions will be slower to improve at IWD and SAW during the day on Wednesday under the n-ne wind onshore flow with improvement to MVFR by late morning and then to VFR in the afternoon. && .MARINE... Issued at 307 PM EDT Tue May 7 2024 Easterly winds diminish to below 20 knots tonight before becoming northeast and increasing to 30 knots on Wed into Wed night. North to northeast winds drop below 20 knots on Thu and stay that way into Sun. && .MQT WATCHES/WARNINGS/ADVISORIES... Upper Michigan... None. Lake Superior... Small Craft Advisory from 11 AM EDT /10 AM CDT/ this morning to 8 PM EDT /7 PM CDT/ this evening for LSZ240>242. Small Craft Advisory from 11 AM this morning to 5 PM EDT this afternoon for LSZ243-244. Lake Michigan... None. && $$ SHORT TERM...GS LONG TERM...07 AVIATION...Voss MARINE...07