Warmth with isolated showers Wednesday
This incredible stretch of weather for Maine continues for one more day. Any areas of patchy fog should clear off by mid-morning. A weak shortwave may bring a few more clouds than Tuesday, but temperatures nudge a bit higher in combination of the upper-level ridge to the west and a southwesterly surface air flow. Record highs are possible in Caribou (73° in 1943) and Houlton (75° in 1954) as the mercury continues to run 15-20° above daily average. Shorelines for MidCoast and DownEast areas will be cooler as the air off the ocean keeps the daily highs in the mid to upper 60s.
Wednesday Noon - Thursday Midnight: The aforementioned shortwave may trigger some isolated showers primarily over the mountains and north for the afternoon into the evening. I can't rule out potential for a sprinkle or light shower for southern and eastern areas as the weak frontal boundary passes through. Shower activity is expected to end by late evening. Expect areas of patchy fog to emerge overnight into Thursday morning.
Driving in Patchy Fog
Driving in fog can be dangerous. Be on the lookout for sudden changes in visibility. The patchy nature of fog can lower visibility quickly and unexpectedly, especially if you are driving fast, so be sure to slow down. Visibility may also be lower near rivers. weather.gov/safety/fog
Showers and cooler temps on the way for the weekend
Wednesday 2 AM - Sunday 8 PM: The pattern becomes more active heading into the remainder of the week. Note the Colorado Low which is dumping snow over the Rockies and associated frontal boundary that drags Hurricane Pamela over the eastern Pacific into the Midwest. The energy associated with that storm could play a factor in how the weekend plays out as it rides along the frontal boundary and a new area of low pressure ignites along it Friday and rapidly intensifies as it races towards northern Quebec and drags a longwave cold front into the region for the weekend.
At this point, the mountains and north appear to receive the most rainfall, which is desperately needed in those areas. Isolated afternoon showers are expected to be in forecast for southern areas Friday and become scattered to the entire state on Saturday. The front slides through Saturday night into early Sunday bringing the best chance for rain for all. Scattered showers may persist into Sunday as a secondary area of low pressure may form along the front as it heads into eastern Canada. Temperatures cool off behind the front to start next week.
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Penn State '21
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