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Next 12 Hours

Forecast data from the National Digital Forecast Database.

5 Day Forecast

• Wednesday
• 
• High: 79 °
• Low: 57 °
• Chance of Rain

• Thursday
• 
• High: 77 °
• Low: 59 °
• Chance of T-Storms

• Friday
• 
• High: 82 °
• Low: 57 °
• Chance of T-Storms

• Saturday
• 
• High: 88 °
• Low: 55 °
• Partly Cloudy

• Sunday
• 
• High: 86 °
• Low: 55 °
• Chance of T-Storms

Area forecast discussion 
National Weather Service Gray ME 
334 PM EDT Tuesday may 22 2012 


Synopsis... 
low pressure to our south will pass east of the area overnight. A 
cold front will move into northern New England by tomorrow morning 
and offshore late tomorrow. Weak high pressure will move into the 
area Thursday and Friday with a chance of showers mainly inland. A 
warm and dry Saturday is on tap as high pressure crests over New 
England...then a cold front is expected to sag from west to east over 
New England Sunday and Monday. The front is expected to push 
northward through the area on Tuesday. 


&& 


Near term /through tonight/... 
a low pressure system was centered near Cape Cod this afternoon 
with a warm front arcing into southern New Hampshire and Maine. Moisture 
continued to flow north into the area. At the same time a cold 
front was moving slowly through southern Quebec...New York...and 
Pennsylvania. 


At the moment most of the heavier showers were located over the 
higher terrain of northern Coos...Franklin...Oxford...and 
Somerset. The hrrr and nam12 indicate a break over much of the 
area tonight except for perhaps southern New Hampshire and southwest Maine 
where moisture convergence is best. Still...expect drizzle and 
widespread fog for much of the region. As the cold front moves 
into the New Hampshire mountains and western Maine overnight...showers will 
become more widespread. There is some elevated instability but 
felt there was not enough to include thunderstorms in the 
forecast. Overnight lows will be in the middle 50s. 


&& 


Short term /Wednesday through Wednesday night/... 
line of showers will work slowly southeast tomorrow with the cold 
front along with isolated thunderstorms. Quantitative precipitation forecast amounts will 
generally be light however any convection will boost rainfall 
totals. We will see clearing and eventually partly sunny skies 
work in from the north by the afternoon. This will contribute to 
high temperatures in the 70s. 


The boundary essentially stalls and by washes out by evening as 
the low pressure to our east pulls away and we lose any upper 
level push. This will ensure moisture hangs around in the low 
levels. Once the rain ends fog will develop and become dense after 
dark. Wednesday night's lows will be in the lower 50s north to 
upper 50s south with negligible temperature advection. 


&& 


Long term /Thursday through Tuesday/...medium range models are in 
fair agreement in the general pattern. Weak surface high pressure 
will remain over the area Thursday and Friday...but shortwaves 
aloft moving through New England will keep a chance of showers 
each day...mainly inland. On Saturday the ridge over the 
southeastern United States surges northward into New England for a 
very warm day...with some locations in New Hampshire possibly 
touching 90 degrees. Then a west-east-oriented cold front will sag 
southward across the area Sunday through Tuesday. Position and 
strength of this boundary are uncertain at this time. Can't rule 
out a chance of afternoon thunderstorms and showers each day. 


&& 


Aviation /18z Tuesday through Sunday/... 
short term...mostly VFR conditions at the moment with a break in 
precipitation for most terminals until the evening. The exception 
will be Portsmouth which stays in an area of convergence. Drizzle 
and fog will return around 00z causing ceilings and visibilities 
to drop again to IFR/LIFR categories. A cold front will move in 
from the west tonight with rain chances increasing from northwest to southeast 
through tomorrow. 


Long term...occasional MVFR conditions in scattered showers 
Thursday and Friday. VFR Saturday then possible MVFR in 
any thunderstorms Sunday. 


&& 


Marine... 
short term...have issued a Small Craft Advisory for high seas beginning tonight and 
ending tomorrow evening as low pressure passes to the east. 


Long term...no significant features during the period. 


&& 


Fire weather... 
scattered showers and high relative humidities will last through 
Friday with a cold frontal passage and more substantial rains 
Saturday. 


&& 


Gyx watches/warnings/advisories... 
ME...none. 
New Hampshire...none. 
Marine...Small Craft Advisory for hazardous seas from 6 PM this evening 
to 8 PM EDT Wednesday for anz150-152-154. 


&& 


$$ 


Hanes/St.Jean