Apex Weather

St. John Valley weather for Sept. 21-27

3-day outlook: Wednesday-Friday

NWS Caribou hazardous weather outlook: The potential exists for strong gusty winds Friday into the weekend, as a powerful low-pressure system associated with Hurricane Fiona tracks into the Canadian Maritimes. Gusts up to 50 mph are possible with this system, which could lead to downed trees and power outages.

An isolated shower is possible this morning with mostly cloudy skies expected over the course of the day as an upper-level ridge of high pressure crosses the region. Clouds increase tonight, with showers likely after midnight along with a chance for an isolated thunderstorms as an occluding frontal system approaches. 

The front will move through Thursday with showers likely across the SJV. Precipitation tapers off Thursday evening as the front moves east. Then, Hurricane Fiona approaches Cape Breton Island/northeast Nova Scotia Friday with increasingly gusty winds across the SJV. NWS Caribou notes that the “system will begin transitioning to an extratropical cyclone which will expand its circulation. We will be on the western edge of the circulation where strong gusty northwesterly winds can be expected Friday night into Saturday. Winds will diminish Saturday night as the low center lifts into Labrador and weakens.”

Today and tonight 

Cloudy early then mostly cloudy with a high around 62 degrees. 20 percent chance for morning showers. Light north wind becoming southeast in the afternoon.

Tonight, partly-to-mostly cloudy in the evening then overcast after midnight with a 90 percent chance for showers and a slight chance for an isolated thunderstorm. Between 1/10th and a quarter-inch rainfall expected. Low near 52 degrees. South wind 4-6 mph.

Thursday, Sept. 22 / Astronomical Autumn begins at 9:03 pm EDT

Mostly cloudy with a 90 percent chance for showers through the afternoon. Between 1/10th and a quarter-inch rainfall expected. High around 64 degrees. Southwest wind around 8 mph in the morning becoming west-northwest wind 5-8 mph in the afternoon.

Thursday night, partly cloudy with a 40 percent chance for showers in the evening. Low near 44 degrees. Northwest wind 5-10 mph. 

Friday, Sept. 23

Mostly cloudy and breezy with a high around 52 degrees. Northwest wind 10-15 mph gusting to 20-25 mph.

Friday night, partly cloudy with a low near 40 degrees. Breezy northwest wind 10-15 mph gusting 25-35 mph.

4- to 7-day outlook: Saturday-Tuesday

Fiona, which will be transitioning to a non-tropical system, will track towards Labrador Saturday keeping windy conditions across the Valley as it interacts with high pressure building in from the west. Partly cloudy skies and breezy conditions are expected Sunday as high pressure continues to build across the SJV and the remnants of Fiona move away. Clouds increase Monday as a low pressure system approaches the Valley from the Great Lakes with a chance for showers by the afternoon. Showers are possible overnight Monday through Tuesday afternoon as the system crosses the Saint John Valley followed by the associated upper-level trough.

Saturday, Sept. 24

Partly sunny and windy with a high around 58 degrees. Northwest wind 15-20 mph with gusts 40 to 50 mph possible.

Saturday night, partly cloudy with a low near 42 degrees. Northwest wind 5-10 mph gusting to 15-20 mph.

Sunday, Sept. 25

Partly cloudy to mostly sunny with a high around 63 degrees. West wind 5-10 mph.

Sunday night, partly cloudy with a low near 45 degrees. 20 percent chance for showers after midnight. South wind 0-5 mph.

Monday, Sept. 26

Partly cloudy in the morning then mostly cloudy in the afternoon. 60 percent chance for showers. High around 64 degrees. South wind 5-10 mph.

Monday night, mostly cloudy with a 50 percent chance for showers. Low near 49 degrees. Southwest wind 0-5 mph.

Tuesday, Sept. 27

Mostly cloudy in the morning then partly sunny in the afternoon with a 50 percent chance for showers. High around 62 degrees. Southwest wind 5-10 mph.

Tuesday night, mostly cloudy with a 30 percent chance for showers. Low near 45 degrees. West wind 5-10 mph.

8- to 14-day trends: Wednesday, Sept. 29-Monday, Oct. 3
Near 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.

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