Area Forecast Discussion
Issued by NWS Marquette, MI
Issued by NWS Marquette, MI
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401 FXUS63 KMQT 081741 AFDMQT Area Forecast Discussion National Weather Service Marquette MI 1241 PM EST Fri Nov 8 2024 .KEY MESSAGES... - Winds shifting to the NW remain breezy through the morning, but turn calmer through the afternoon. - Dry weather weather through Saturday with above normal temperatures, then rain returns Saturday night and Sunday. - Blustery west to northwest winds on Monday, especially over the Keweenaw and eastern Lake Superior shoreline areas where gusts of 40-45 mph are possible. - Next chance for widespread precipitation possible Wednesday/Thursday, but uncertainty on specifics is high && .UPDATE... Issued at 611 AM EST Fri Nov 8 2024 The forecast remains on track this morning. Though westerly winds are coming down compared to earlier tonight, 20-25mph gusts are still expected across the Keweenaw and eastern UP through the morning hours. Winds slowly fall back this afternoon while turning to the NW. && .SHORT TERM /THROUGH TONIGHT/... Issued at 252 AM EST Fri Nov 8 2024 The Great Lakes remain situated between deep low pressure moving into northern Quebec and high pressure sprawled out over the Plains. Resulting tight pressure gradient is keeping winds gusty out of the west early this morning, particularly across the Keweenaw, where gusts around 20-30mph (and higher) remain common. Elsewhere across the UP, winds continue to gust up to 20mph. Temperatures are staying a couple degrees warmer than expected so far, but are still looking to fall into the mid 30s in the interior UP and the upper 30s to near 40 along the lakeshores. Sunny and increasingly quieter weather is expected today as the aforementioned low continues to pull away and the ridge builds over the UP. Winds shifting to the NW gradually fall back, while temperatures climb to highs mainly in the upper 40s under sunny skies. Skies remain mostly clear into the night while winds remain light, allowing for better radiational cooling compared to early this morning. Expect lows in the 20s in the interior UP, and in the lower 30s near the lakeshores. && .LONG TERM /SATURDAY THROUGH THURSDAY/... Issued at 344 AM EST Fri Nov 8 2024 Surface and upper-level ridging will continue to dominate the region, keeping Upper Michigan dry through Saturday with above normal temperatures expected on Saturday in the upper 40s and lower 50s. By Saturday night into Sunday, the focus shifts to a closed low now over the desert Southwest which will be poised to lift through the Central Plains on Saturday and into the Upper Great Lakes later this weekend, bringing our next shot of rain late Saturday night into Sunday evening. Models still not in great agreement on the sfc low track into the Upper Great Lakes on Sunday but guidance suggests any rainfall will be light, generally in the .1 to .2 inch range based on ensemble probability QPF fields, highest south central and east along the most probable sfc low track. After a brief period of ridging and drying on Sunday night, a Clipper shortwave moving through northern Ontario and associated CAA behind it under a gusty nw wind flow into the Upper Great Lakes should initiate some light showers across the area on Monday, especially into northwest and eastern portions of the U.P. on Monday. With 850 mb temps expected to dip as low as -7C and Lake Superior sfc temps 9-10C, expect the overwater instability to generate some lake effect rain/snow showers Monday afternoon/evening especially in the far east, although coverage of lake effect showers will likely be offset by dry low levels as noted by inverted-V look to fcst soundings. Increased mixing from the unstable conditions will allow west to northwest winds to gust perhaps as high as 40-45 mph across the Keweenaw and eastern shoreline areas on Monday. Ridging and continued subsidence building in from the west behind the shortwave should quickly end any remaining lake effect pcpn by late evening Monday. Highs on Monday will quickly range from the mid 40s northwest to the lower 50s south and east. After a period of drier conditions under ridging on Tuesday, our attention then turns to a shortwave/frontal boundary moving through the region in the Wednesday/Thursday time frame. Model agreement on forecast details at this time is poor with this midweek system, lending great uncertainty to the forecast details. Deterministic models and ensemble members offer a wide range of solutions and spread with perhaps the GFS/GEFS hinting at a deeper solution than the ECMWF/EPS. Given the great uncertainty, for now will stick closer to the model blend on pops and temps at this time. && .AVIATION /18Z TAFS THROUGH 18Z SATURDAY/... Issued at 1240 PM EST Fri Nov 8 2024 High pres approaching from the w will move across the Upper Great Lakes tonight. Associated dry air mass will allow VFR to prevail at IWD/CMX/SAW thru this fcst period. NW to N winds around 10kt, but gusting to near 20kt at SAW, will diminish to light under 5kt late aftn/early evening as the high arrives. S winds will set in overnight, but will remain under 10kt thru Sat morning. && .MARINE... Issued at 344 AM EST Fri Nov 8 2024 After westerly gales of 35 to 40 kts end around sunrise over the east half of Lake Superior, winds then veer northwest 15-30 kts by late morning (highest east half) and then weaken to 20 kts or less late in the day as surface high pressure builds in from the west. Winds will remain light, less than 20 kts, into tonight. As the surface high pushes east of the Upper Great Lakes on Saturday a surface low will gradually be lifting north through the Central Plains. This will result in southerly winds increasing to 20-25 knots on Saturday, highest north and east half. The Plains low will eventually reach northern Lake Michigan on Sunday at 29.6 inches as winds become light, generally less than 20 kts late Saturday night into Sunday evening. A deeper low pressure of 29.3 inches moving east through northern Ontario will bring a front and associated shot of cold air across Lake Superior on Monday. The unstable conditions will cause gusty west to northwest gales to develop Monday into Monday evening with model ensemble probability showing a high potential for at least low-end gales (70-90%) across central and eastern Lake Superior. Ridging builds in quickly Monday night as winds fall below 20kts Monday night into Tuesday morning, but as the high pushes east southerly winds will ramp up to 25 to 30 kts late Tuesday with EPS ensemble probability showing a 30-50% chance of low-end gales Tuesday night into Wednesday over northern and eastern sections of the lake ahead of another approaching frontal system during the midweek period. && .MQT WATCHES/WARNINGS/ADVISORIES... Upper Michigan... None. Lake Superior... None. Lake Michigan... None. && $$ UPDATE...LC SHORT TERM...LC LONG TERM...Voss AVIATION...Rolfson MARINE...Voss