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A cold front will approach overnight and cross the area on Monday and Monday evening, followed by high pressure building in from the west through Wednesday. A cold front crosses the area Wednesday night and Thursday morning. A warm front approaches from the southwest late Thursday and Thursday night, then lifts to the northeast on Friday. 12:05 AM Update: Very mild inland as of midnight with temperatures still in the low 70s in Caribou! Satellite pictures show that the low clouds are still mostly hanging offshore, with some lower clouds along parts of coastal Washington County. Made some adjustments to the sky grids based on the latest satellite trends. Showers ahead of a cold front are still mostly along or west of the Saint Lawrence River valley. Clouds will increase along with showers chances toward daybreak across the western zones. The upper level ridge will start to move to the E with the approaching cold front from the W tonight. By Monday, the cold front will enter the western edge of the area in the morning then quickly move through the region throughout the day. Rain showers are expected to end in the North Woods in the afternoon. Upper air model soundings indicate very weak surface CAPE and low lapse rates, but positive Showalter index, long, skinny CAPE, and high PWATs near 2 inches. In addition, the NAM shows a thin line of theta-E moving through the region after the pre- frontal boundary pushes through. This could indicate initial clearing ahead of convection which could provide enough lift to produce thunderstorms. All this ingredients is expected to produce isolated thunderstorms with the possibility of producing heavy rain. Temps around the low 70s on Monday could bounce around between upper 60s to low 70s if the NAM is to be trusted and the initial clear happens in the afternoon. As the front moves through, expect breezy conditions with gusts up 25 mph. The region is under SW flow at and above 700 hPa Monday night, with the flow becoming NW through the night below that. The low level flow will dry out this portion of the atmosphere, so even with shortwaves embedded in the flow, it should be dry, except for possibly some lingering showers over Downeast Maine early in the evening.

Lows Monday night should be near to slightly below normal.Ī northern stream shortwave trough crosses the area Tuesday, however, with dry low levels, it should remain dry. Highs on Tuesday should be near to slightly below normal. Northern stream shortwave ridging transits the area Tuesday night, with associated subsidence keeping things dry with minimal, if any cloud cover. Noting the expected mainly clear to clear sky and light winds, did opt towards the lower end of guidance for lows, with decent radiational cooling conditions expected. Lows Tuesday night should be around 5 degrees below normal, except up to around 10 degrees below normal in normally cooler valleys. Even with shortwaves embedded in the flow, the low to mid levels should be sufficiently dry to preclude any precipitation.

Highs on Wednesday should be a few degrees above normal and around 5-10 degrees warmer than on Tuesday. LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/. A northern stream trough crosses the area Wednesday night.