FXUS63 KDTX 192242 AFDDTX Area Forecast Discussion National Weather Service Detroit/Pontiac MI 642 PM EDT Thu Apr 19 2018 .AVIATION... High pressure will build into the area from the west during the forecast period and provide vfr conditions with relatively light winds. Northwest flow will ease to 10-12 knots this evening and approach those levels again on Friday during best period of mixing. The only expected clouds will be thin cirrus, mainly on Friday. .DTW THRESHOLD PROBABILITIES... * None. && .PREV DISCUSSION... Issued at 328 PM EDT Thu Apr 19 2018 DISCUSSION... The upper low responsible for the clouds earlier this morning has quickly exited to the east allowing clearing to occur quicker than anticipated. Due to this earlier clearing trend, temperatures have risen several degrees above model guidance this afternoon with most locations in the upper 40s to low 50s across SE Michigan. Incoming high pressure has led to a tightened pressure gradient supporting gusty northwest winds across the region. As the high settles into the region tonight, expect winds to dissipate quickly under clear skies. This will allow temperatures to fall quickly through the evening into the upper 20s to possibly mid 20s in colder, outlying areas by late tonight (possibly near the record low of 24 at Flint). An upper level ridge will then slowly slide eastward into the region on Friday into Saturday while surface high pressure becomes established over the Great Lakes. This will maintain dry, calm conditions to end the week. With mainly clear skies on Friday high temperatures could again overachieve Friday afternoon with widespread mid 50s across SE Michigan. An upper low moving well to the south of the region this weekend will bring some high clouds across mainly the southern half of the CWA on Saturday while high temperatures rise into the upper 50s. The stretch of dry weather and accompanying plentiful sunshine will continue through the end of the weekend and into early next week as high pressure remains in control. Aloft, upper-level ridging will gradually break down with time into early next week as a broad, closed upper low across the lower Mississippi River Valley interacts with northern stream energy diving southeastward from the northern Plains. Partial phasing of these two features will lead to an increasing chance for showers for the midweek period. Remnant deep longwave troughing across the eastern CONUS will give way to building heights aloft to end the work week and a return to drier weather. Temperatures will continue to moderate through the 50s to near normal for late April (around 60), with high temperatures reaching into the low/mid 60s Monday and Tuesday. As showers overspread the region during the midweek period, temperatures will cool, but still remain in the 50s for daytime highs. MARINE... Northwest winds gusting to 25 knots or slightly greater over much of Lake Huron this afternoon will slowly decrease tonight as high pressure builds into the Central Great Lakes tomorrow, leading to light and variable winds over the Weekend. Small craft advisories continue for the southern Lake Huron waves through Friday morning, as waves do not fall below 4 feet until Friday afternoon. Light southerly winds early next week as high pressure slides off the East Coast. && .DTX WATCHES/WARNINGS/ADVISORIES... MI...NONE. Lake Huron...Small Craft Advisory until 4 PM EDT Friday for LHZ421-441>443. Lake St Clair...NONE. Michigan waters of Lake Erie...NONE. && $$ AVIATION.....DG DISCUSSION...JD/IRL MARINE.......SF You can obtain your latest National Weather Service forecasts online at www.weather.gov/detroit.