SJV Weather for Aug. 18-24, 2021
Short-Term Outlook: Wednesday – Friday
Southwest flow across the region behind high pressure centered southeast of the state today will channel plenty of moisture across the region increasing both clouds and humidity levels. A weak upper-level trough will approach today and cross the region tonight. Valley residents can expect some isolated morning showers with more widespread showers activity along with some isolated thunderstorms this afternoon. With generally light winds aloft, storms will move slowly and may feature heavy downpours. Dew points will rise into the middle 60s and remain there through Friday morning creating muggy conditions across the Valley.
Thursday will be hot and muggy with partly cloudy to mostly sunny skies across much of the SJV. The remnants of Fred are expected to slide across southern/coastal Maine with little impact on the Valley currently anticipated. Indeed, aside from an isolated shower, no significant precipitation is expected.
A cold front will slide down from the north Friday with partly cloudy skies and a chance for some scattered showers as it moves across the SJV. Little precipitation is associated with this system, and it will drop to the coast with high pressure building down from the north producing mostly clear skies across the region overnight into Saturday morning.
Today & Tonight
Partly sunny with a chance for isolated morning showers then scattered afternoon showers with isolated thunderstorms. Chance for precipitation 50 percent. Precipitation totals less than 0.10-inch with higher totals possible in any storms. High near 81 degrees with southwest winds 6-9 mph.
Wednesday night, partly cloudy with a 40 percent chance for scattered showers and isolated thunderstorms, mainly in the evening. Low around 64 degrees with southwest winds 2-3 mph.
Thursday, August 19
Partly cloudy with a 5 percent chance for isolated showers. High near 88 degrees with west winds 4-5 mph.
Thursday night, partly cloudy with a 10 percent chance for isolated showers. Low near 63 degrees with west winds 3-4 mph.
Friday, August 20
Partly cloudy with a 30 percent chance for isolated to scattered, mainly afternoon showers. High around 83 degrees with northwest winds 6-10 mph.
Friday night, partly cloudy with a low near 55 degrees. 10 percent chance for isolated showers with northeast winds near calm.
Medium-Range Outlook: Saturday – Tuesday
High pressure to the north/northeast will bring partly cloudy to mostly sunny skies and lower humidity Saturday with mostly clear skies overnight into Sunday. A weak trough brings a chance for mainly afternoon showers Sunday with a chance for scattered showers overnight into Monday.
Forecast uncertainty increases due to the ultimate track of Henri. Models vary with the track of the tropical system due to the location of an upper-trough to the west/northwest of the Valley late in the weekend. Depending on where this trough is located early next week, Henri could be pulled close to Downeast Maine as Hurricane or strong Tropical Storm.
Other models keep the storm weaker and further out to sea with high pressure suppressing the storms track southwards with little impact on the state and/or New England in general. Due to considerable uncertainty at this time, updates on Henri should be monitored as the week progresses.
Saturday, August 21
Partly cloudy to mostly sunny with a 10 percent chance for isolated showers. High near 80 degrees with southeast winds around 4 mph.
Saturday night, partly cloudy with a 20 percent chance for isolated showers. Low near 57 degrees with southeast winds around 4 mph.
Sunday, August 22
Partly cloudy with a 30 percent chance for scattered showers, mainly in the afternoon. High near 81 degrees with south winds around 7 mph.
Sunday night, partly cloudy with a 20 percent chance for isolated showers. Low near 61 degrees with south winds around 3-4 mph.
Monday, August 23
Partly sunny with a 50 percent chance for showers and isolated afternoon thunderstorms. High around 81 degrees with southwest winds around 5-6 mph.
Monday night, partly cloudy with a 40 percent chance for scattered showers and isolated thunderstorms. Low near 60 degrees with northwest winds around 3-4 mph.
Tuesday, August 24
Partly sunny with a 30 percent chance for scattered showers, mainly in the morning. High near 79 degrees with northwest winds 5-6 mph.
Tuesday night, partly cloudy with a 10 percent chance for isolated showers. Low near 57 degrees with north winds around 3 mph.
Long-Range Trends: Wed. Aug. 25 – Tue. Aug. 31Near normal temperatures / Near normal precipitation
Note: Computer model precision diminishes the further into the week the forecast projects. Check the Fiddlehead Focus for weather updates with more current information.
The Week Ahead is the work of UMFK Professor Joseph E. Becker based on personal weather station data, various computer forecast models, and information that the National Weather Service, NOAA, and other weather resources provide.