Area Forecast Discussion
Issued by NWS Portland, ME

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FXUS61 KGYX 041858
AFDGYX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAY ME
258 PM EDT FRI SEP 4 2015

.SYNOPSIS...
HIGH PRESSURE WILL BUILD SOUTH FROM CANADA THROUGH SATURDAY, THEN
MOVE OFFSHORE SATURDAY NIGHT. THIS HIGH WILL PROVIDE THE REGION
WITH A RESPITE IN THE HEAT AND HUMIDITY AT LEAST FOR A LITTLE
WHILE. HOWEVER...THE HEAT AND HUMIDITY WILL RETURN SUNDAY AS THE
HIGH ANCHORS OFF THE COAST. JULY-LIKE WEATHER IS EXPECTED MONDAY
INTO WEDNESDAY. A SLOW-MOVING COLD FRONT WILL CROSS THE AREA
THURSDAY INTO FRIDAY WITH SHOWERS AND THUNDERSTORMS.

&&

.NEAR TERM /THROUGH TONIGHT/...
A LARGE SURFACE/UPPER RIDGE OF HIGH PRESSURE IS CURRENTLY OVER
THE AREA. CLEAR SKIES AND LIGHT WINDS TONIGHT WILL PROVIDE
RADIATIONAL COOLING SO A COOL NIGHT WILL BE EXPECTED WITH
TEMPERATURES DROPPING INTO THE 40S TO LOWER 50S. AREAS OF VALLEY
FOG ARE EXPECTED LATER TONIGHT.

&&

.SHORT TERM /SATURDAY THROUGH SATURDAY NIGHT/...
HIGH PRESSURE ANCHORED OVER THE REGION WILL PROVIDE SUNNY SKIES
AND LIGHT WINDS WITH TEMPERATURES RECOVERING TO NEAR OR SLIGHTLY
ABOVE SEASONAL LEVELS. HIGH PRESSURE REMAINS CENTERED OVER THE
AREA SAT NIGHT WITH CLEAR SKIES AND CALM WINDS. OVERNIGHT LOWS
WILL NOT BE AS COOL EVEN WITH THE RADIATIONAL COOLING IN PLACE.
AREAS OF VALLEY FOG IS EXPECTED LATER AT NIGHT. USED A BLEND OF
MODEL TEMPS.

&&

.LONG TERM /SUNDAY THROUGH FRIDAY/...
THE UPPER LEVEL PATTERN BEGINS IN NEAR ZONAL FLOW FOR SUNDAY INTO
MONDAY. BY THE END OF THE WORK WEEK A DEEP TROUGH IS CARVED OUT
OVER THE EASTERN THIRD OF THE CONUS AND WILL BE MOVING TOWARDS
NEW ENGLAND. HIGH TEMPERATURES WILL HOVER IN THE UPPER 80S TO
LOWER 90S SUNDAY THROUGH WEDNESDAY WITH A CHANCE OF SHOWERS OVER
THE HIGHER TERRAIN... ESPECIALLY DURING THE HEAT OF THE DAY.

PRECIPITATION CHANCES INCREASE FOR THE ENTIRE AREA FOR THE LATTER
HALF OF THE WEEK. ON THURSDAY A BOUNDARY BEGINS TO MOVE THROUGH THE
REGION BRINGING WIDESPREAD SHOWERS AND A FEW THUNDERSTORMS. SLIGHTLY
COOLER AIR MOVES IN BEHIND THIS BOUNDARY WITH MOST LOCATIONS IN THE
70S ON FRIDAY. A REINFORCING FRONT... ASSOCIATED WITH A POTENT SHORT
WAVE AND THE AFOREMENTIONED UPPER LEVEL TROUGH... SWEEPS THROUGH
LATE FRIDAY BRINGING HEAVIER RAIN AND PERHAPS A FEW SIGNIFICANT
THUNDERSTORMS.

&&

.AVIATION /17Z FRIDAY THROUGH TUESDAY/...
SHORT TERM...VFR THROUGH SATURDAY. HOWEVER...LOCAL IFR CONDITIONS
IN RIVER VALLEY FOG WILL OCCUR IN RIVER VALLEYS LATE TONIGHT AND
EARLY SATURDAY MORNING.

LONG TERM...LOCAL IFR POSSIBLE MONDAY AND TUESDAY MORNING IN
VALLEY FOG AND STRATUS.

&&

.MARINE...
SHORT TERM...WINDS AND SEAS TO REMAIN LIGHT. NO FLAGS ARE
THROUGH SATURDAY NIGHT.

LONG TERM...MONDAY NIGHT INTO TUESDAY...SMALL CRAFT WINDS AND
SEAS ARE POSSIBLE AS THE SURFACE PRESSURE GRADIENT TIGHTENS.

&&

.GYX WATCHES/WARNINGS/ADVISORIES...
ME...NONE.
NH...NONE.
MARINE...NONE.

&&

$$

MARINE/HANES



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