textproduct: Caribou
This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.
WHAT HAS CHANGED
- Temperatures on Sunday night should generally be above frost level.
KEY MESSAGES
1) Below freezing temperatures over the north tonight and Saturday night leading to widespread frost, especially in colder valleys. This may lead to damage to sensitive vegetation.
2) Widespread soaking rain likely From Sunday night into Memorial Day. This could help aid in mitigating on going drought conditions across portions of the region.
DISCUSSION
KEY MESSAGE 1...Below freezing temperatures over the north tonight and Saturday night leading to widespread frost, especially in colder valleys. This may lead to damage to sensitive vegetation.
KEY MESSAGE 1 DESCRIPTION... Dry airmass continues to move in. This will lead to clearing skies but will also lead to fairly dry dewpoints as well. This may prevent frost from developing in portions of the area tonight. Frost advisory remains in effect for Central Piscataquis, northern Penobscot and eastern Aroostook counties for tonight where the growing season is now climatologically active. The North Woods will drop below freezing tonight with widespread frost over the area. Tomorrow night will once again drop below freezing over the North Woods. The airmass will be moderating but ridge axis will be cresting over the area. This will lead to another round of frost during the overnight hours and possibly a little further south than tonight.
KEY MESSAGE 2...Widespread soaking rain likely From Sunday night into Memorial Day. This could help aid in mitigating on going drought conditions across portions of the region.
KEY MESSAGE 2 DESCRIPTION... The upper level ridge will move to the E of the region Sunday night. The upper level trof slowly becomes closed which intensifies the surface low pressure system. This should stretch the vort max across the region onto the surface low. Through Memorial Day, the surface low should cross the Gulf of Maine.
This system should bring widespread wetting rain to the region from Sunday night into Memorial Day, with the potential for a widespread 1/4 to 1/2 inch of rainfall area wide. As a result expect Monday to be cooler than Sunday, with highs from the mid 50s to around 60.
AVIATION /18Z THURSDAY THROUGH TUESDAY/
Tonight...VFR. WNW winds 5-10kts.
Friday...VFR. NW 10-20kts with gusts 25-30kts.
Friday night...VFR. NW winds less than 5kts.
Saturday-Sunday...VFR. Light and variable winds, then S winds 5-10 kts on Sunday.
Sunday night-Monday...MVFR/IFR in rain showers. SSE winds 5-10 kts.
Monday night-Tuesday...VFR with brief MVFR in rain showers mainly Tuesday afternoon. Light and variable winds.
MARINE
Seas and winds remain well below small craft levels through the period.
A fairly relaxed pressure gradient over the waters Saturday-Monday should limit winds over the coastal waters to 15 kt or less and seas to 4 ft or less. Over the outer waters Saturday-Monday winds should be 20 kt or less and seas at or below 5 ft.
CAR WATCHES/WARNINGS/ADVISORIES
ME...Frost Advisory from midnight tonight to 7 AM EDT Friday for MEZ002-005-006-010. MARINE...None.
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