textproduct: Caribou

WHAT HAS CHANGED

- Updated aviation discussion.

KEY MESSAGES

1) Potential for patchy frost both Monday and Tuesday night across the north.

2) A coastal low could impact at least Downeast Maine late this week.

DISCUSSION

KEY MESSAGE 1... Potential for patchy frost both Monday and Tuesday night across the north.

KEY MESSAGE 1 DESCRIPTION... Strong Canadian high pressure builds into the region Monday night. With mostly clear skies amd light winds during the overnight hours, radiational cooling conditions are possible in the north. This could will result in patchy frost. The frost will be limited to the north due to ample cloud cover elsewhere, with best conditions in the low lying cold valleys.

High pressure will be ridged across the region Tuesday night with clear skies and light winds. This will provide favorable conditions for radiational cooling. Patchy/areas of frost are expected Tuesday night across northern and central portions of the region. Temperatures could fall below freezing across the normally colder northern low lying and valley locations.

KEY MESSAGE 2... A coastal low could impact at least Downeast Maine late this week.

KEY MESSAGE 2 DESCRIPTION... An ocean low will develop offshore from the Mid-Atlantic region mid week. At the same time, high pressure will remain centered northwest of the region. The track of the ocean low through late week is still uncertain. With blocking high pressure to the northwest, uncertainty still exists regarding the northern edge of the precipitation shield and whether rain will reach the forecast area.

AVIATION /18Z SUNDAY THROUGH FRIDAY/

Today...Generally VFR, becoming MVFR as lower ceilings and rain showers move into the Downeast terminals. S winds 10-15kts with gusts up to around 20kts.

Tonight...MVFR/IFR, occasional LIFR. A chance of showers at all terminals, along with patchy fog. S winds 5-10 kts, becoming W/NW.

Monday...MVFR/IFR early in patchy fog, before lifting to VFR after sunrise. NW 5-10kts, gusting to 15-20kts in the afternoon.

Monday night...VFR. NW winds in the north at 5-10kts, with N winds 5-10kts in the Downeast and Bangor region.

Tuesday-Thursday night...Variable conditions in any patchy late night fog. Otherwise, VFR. North/northeast winds 5 to 10 knots.

Friday...VFR north. VFR/MVFR Downeast with a chance of rain. Across northern areas, northeast/north winds 5 to 10 knots. Across Downeast areas, northeast/north winds 10 to 15 knots with gusts up to around 20 knots.

MARINE

Seas and winds remain below SCA levels over all waters through Monday night. Patchy fog and rain showers reducing visibilities possible tonight. S winds today, becoming light and variable overnight. Become N on Monday.

Small craft advisory level wind gusts possible Wednesday. Building seas late week.

CAR WATCHES/WARNINGS/ADVISORIES

ME...None. MARINE...None.