textproduct: Gray - Portland

WHAT HAS CHANGED

Minor update to the Aviation section for the 12Z TAFs.

KEY MESSAGES

1. Rain moves away from the coast, with a warm up getting underway today.

2. Return to above average temperatures during the latter half of the work week with increasing humidity. Thunderstorm chances increase Thursday afternoon onward.

DISCUSSION

KEY MESSAGE 1 DESCRIPTION...

Rain continues to move away from the coast this morning as low pressure tracks out to sea. Broad high pressure gradually builds in from the west through the daytime, bringing abundant sunshine. With the sunshine, temps rise into the 80s across most of the area today. A seabreeze is expected along the coast during the afternoon hours, knocking temps back into the 70s this afternoon.

A quiet night is expected with lows generally bottoming out in the 60s. As dew points continue to creep up with the warming airmass, nighttime valley fog is likely again tonight through the northern valleys and the CT River Valley.

KEY MESSAGE 2 DESCRIPTION...

A typical summertime pattern is expected mid to late week as temperatures warm into the middle to upper 80s with a few spots approaching the 90 degree mark. The warmest day looks to be Thursday with dew points climbing into the middle to upper 60s. This may result in afternoon heat indices to approach 95F for a couple of hours, mainly across southern NH. A few scattered showers and thunderstorms will also be possible, especially across the mtns and towards the Canadian Border as a cold front sags southward.

Scattered showers and thunderstorms will remain possible on Friday with high temperatures roughly 5 degrees cooler than those of Thursday but it will remain humid. Temperatures look to largely remain near or a bit above avg this weekend into early next week with typical diurnally driven showers and thunderstorms possible at times.

AVIATION /12Z WEDNESDAY THROUGH SUNDAY/

Through 12Z Thursday...Valley fog at CON and LEB will dissipate over the next hour or two. Low cigs at RKD will also scatter by mid morning. VFR then prevails today, but valley fog will be possible again tonight at LEB, HIE, and CON. VFR likely prevails elsewhere tonight.

Outlook:

Thursday-Sunday: Mainly VFR conditions expected with TEMPO restrictions possible at times within scattered SHRA/-TSRA, especially during the afternoon hours.

MARINE

Seas lower below SCA levels across the southern waters through daybreak. Fair conditions return as high pressure gradually builds across the waters today and low pressure exits the Gulf of Maine. Fair conditions continue tonight. Seas outside of the bays may approach 5 ft Thursday PM but otherwise winds and seas will likely largely remain below SCA criteria through early next week.

GYX WATCHES/WARNINGS/ADVISORIES

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