Wednesday-Friday
High pressure will remain across the region today with a surface trough located to the west of Maine near the Saint Lawrence River. Meanwhile, a shallow upper-level trough approaches today and crosses the region tonight with partly sunny skies over the Valley today and mostly cloudy skies tonight. Light winds will help some patchy fog form overnight.
High pressure will build across the region Thursday with mostly sunny to partly cloudy skies and some isolated afternoon showers with a couple-hundredths an inch rainfall possible for most locations. Skies become mostly clear Thursday night with mostly sunny skies Friday and mostly clear skies Friday night.
Saturday-Tuesday
High pressure slides Saturday into Sunday, with a warm front and southerly flow drawing warmer temperatures into the region. Mostly sunny to partly cloudy skies are expected Saturday with a slight chance of afternoon showers as the warm front moves across the St. John Valley.
On Sunday, low pressure lifting towards James Bay in Canada pulls an occluded front towards the region with a chance of afternoon showers for Valley communities. A chance of showers continues Sunday night with showers likely Monday into Tuesday as the occluded front approaches and crosses the area. Isolated afternoon thunderstorms are also possible Monday and Tuesday.
Currently, precipitation amounts are uncertain due to model uncertainty, particularly with regards to atmospheric dynamics and some subtropical moisture that may be channeled into the region from a system off the Mid-Atlantic early next week, which could enhance precipitation amounts for northern Maine.
Daily Forecast
Wednesday: Partly sunny. Highs in the lower 70s. East winds around 5 mph.
Wednesday Night: Mostly cloudy. Patchy fog after midnight. Lows in the upper 40s. Southeast winds around 5 mph, becoming northwest after midnight.
Thursday: Mostly sunny. Patchy fog in the morning. A slight chance of showers in the afternoon. Highs in the mid-70s. Northwest winds around 5 mph. Chance of rain 20 percent.
Thursday Night: Mostly clear. Lows in the mid-40s. North winds around 5 mph in the evening, becoming light and variable.
Friday: Sunny. Highs in the upper 70s. North winds around 5 mph.
Friday Night: Mostly clear in the evening, then partly cloudy with a slight chance of showers after midnight. Lows around 50. Chance of rain 20 percent.
Saturday: Mostly sunny. Highs in the upper 70s.
Saturday Night: Partly cloudy in the evening, then becoming mostly cloudy. Lows in the mid-50s.
Sunday: Partly sunny. A chance of showers in the afternoon. Highs in the upper 70s. Chance of rain 40 percent.
Sunday Night: Showers likely. Lows in the mid-50s. Chance of rain 70 percent.
Monday: Showers. Highs in the lower 70s. Chance of rain 80 percent.
Monday Night: Showers, mainly in the evening. Lows in the lower 50s. Chance of rain 80 percent.
Tuesday: Showers likely. Highs in the upper 60s. Chance of rain 70 percent.
Tuesday Night: Showers and thunderstorms likely. Lows in the upper 40s.
Note: Weather information is based on computer weather models, personal weather station data, and information from NOAA, the National Weather Service, and other weather data providers available at time of update and may not reflect current conditions or later forecast updates. Check The County.me or the National Weather Service Caribou, Maine for weather updates with more recent information for the Saint John Valley.
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.
