St. John Valley Weather for July 8-14, 2020
Short-Term Outlook: Wednesday-Friday
A warm front will approach the Valley today and cross the region this evening. There will be two waves of activity associated with this system with the first wave occurring this morning followed by another round of showers and thunderstorms this afternoon.
Current atmospheric dynamics indicate that isolated strong storms will be most likely in the Allagash / North Woods regions with central and eastern portions of the County at risk for non-severe thunderstorms. Locally heavy downpours and gusty winds are possible with any thunderstorm activity today. Cloudy skies this morning will become mostly cloudy this afternoon then partly cloudy tonight as the warm front moves east of the region. Humidity will increase and conditions will remain rather muggy through early next week.
Thursday will feature partly cloudy skies, hot, and humid conditions with a slight chance for afternoon showers and thunderstorms. Partly cloudy skies are expected Friday with temperatures reaching the upper 80s/lower 90s across the SJV. There will be a slight chance for afternoon showers and thunderstorms Friday as daytime heating destabilizes the atmosphere. Partly cloudy skies are expected Friday night with continued warm and humid conditions.
Today & Tonight
Mostly cloudy, warm, and increasingly humid with an 100 percent chance for showers and thunderstorms. A few strong-to-severe storms are possible, especially in the Allagash and North Woods. Rainfall totals between 1/2 and 3/4-inch possible with some locally heavy downpours. High around 74 degrees F. South/southeast winds around 0 to 5 mph.
Overnight, partly cloudy with a 20 percent chance for showers before midnight. Low near 60 degrees F with south/southeast winds near calm.
Thursday, July 9
Partly cloudy and humid with a 20 percent chance for afternoon/evening showers and thunderstorms. High near 87 degrees F with west/southwest winds 0 to 5 mph.
Thursday night, partly cloudy with a low near 62 degrees F. West/southwest winds 0 to 5 mph.
Friday, July 10
Partly cloudy, hot, and humid with a 20 percent chance for afternoon/evening showers and thunderstorms. High near 90 degrees F. South winds 5 to 10 mph.
Friday night, partly cloudy with a 20 percent chance for showers. Low near 65 degrees F. South winds 0 to 5 mph.
Medium-Range: Saturday – Tuesday
A tropical/subtropical low pressure area is expected to track up the East Coast Thursday and Friday and weaken as it moves across western New England from the south Saturday. Showers are expected to overspread the Valley Saturday afternoon with rain likely overnight into Sunday. Showers and a chance for thunderstorms will be possible Sunday into Sunday night as the system lifts northeast into the Maritimes Sunday. An area of low pressure will track northeast from the eastern Great Lakes Monday and Tuesday with a chance for showers and thunderstorms Monday and decreasing chances for showers Tuesday.
Saturday, July 11
Partly sunny in the morning then mostly cloudy in the afternoon with a 50 percent chance for showers, mainly in the afternoon. High near 83 degrees F with south winds 5 to 10 mph.
Saturday night, mostly cloudy with a 60% chance for showers and thunderstorms. Low near 64 degrees F with south/southeast winds 0 to 5 mph.
Sunday, July 12
Mostly cloudy with a 70 percent chance for showers and thunderstorms. High near 80 degrees F. West/southwest winds 5 to 10 mph.
Sunday night, partly cloudy with a 50 percent chance for showers and thunderstorms. Low near 60 degrees F. West/southwest winds 0 to 5 mph.
Monday, July 13
Partly sunny with a 50 percent chance for showers and a slight chance for afternoon thunderstorms. High near 80 degrees F with west/northwest winds 5 to 10 mph.
Monday night, partly cloudy with a 30 percent chance for showers. Low near 59 degrees F with northwest winds 0 to 5 mph.
Tuesday, July 14
Partly sunny and less humid with a 50 percent chance for showers. High near 77 degrees F. Northwest winds 5 to 10 mph.
Tuesday night, partly cloudy with a 30 percent chance for showers. Low near 57 degrees F. Southwest winds 0 to 5 mph.
Regional Long-Range Trends: Wed. July 15 – Tue. July 21
Above normal temperatures and slightly below 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.