000 FXUS61 KCAR 082013 AFDCAR AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CARIBOU ME 413 PM EDT MON APR 8 2002 .SYNOPSIS... LOW PRESSURE WILL LIFT THROUGH THE GREAT LAKES TONIGHT...THEN TRACK TOWARD MAINE TUESDAY...BRINGING RAIN TO THE REGION. THE LOW WILL CROSS THE STATE TUESDAY NIGHT. SCATTERED RAIN SHOWERS COULD LINGER EARLY WEDNESDAY...WITH HGH PRESSURE BUILDING BACK TOWARD THE STATE LATER WEDNESDAY. .DISCUSSION... CURRENT SURFACE ANALYSIS INDICATED LOW PRESSURE ACROSS THE MID MISSISSIPPI RIVER VALLEY. THE LOW WILL LIFT THROUGH THE GREAT LAKES TONIGHT...THEN APPROACH MAINE TUESDAY. THE LOW WILL CROSS THE STATE TUESDAY NIGHT DRAWING A COLD FRONT ACROSS THE REGION LATE. HIGH PRESSURE WILL BUILD BACK TOWARD THE STATE WEDNESDAY. ALOFT...A VORT MAX WILL LIFT TOWARD THE REGION TONIGHT...WITH ANOTHER DISTURBANCE TUESDAY. KCBW 88D INDICATED LIGHT RAIN SHOWERS/SPRINKLES SCATTERED ACROSS MOSTLY CENTRAL/DOWNEAST PORTIONS OF THE FORECAST AREA. MODELS SHOW DEEP MOISTURE OVERSPREADING THE FORECAST AREA TONIGHT WITH 1000-500 MB LAYER AVERAGE RELATIVE HUMIDITIES INCREASING TO AROUND 90 PERCENT...ALONG WITH 850-500 MB LAYER Q-VECTOR CONVERGENCE ASSOCIATED WITH WARM AIR ADVECTION AND THE APPROACHING VORT MAX. PRECIPITATION WILL BECOME MORE WIDESPREAD OVERNIGHT...PARTICULARLY ACROSS NORTHERN AREAS. WILL HAVE CATEGORICAL POPS NORTH AND LIKELY POPS DOWNEAST TONIGHT. ALTHOUGH PRECIPITATION SHOULD GENERALLY REMAIN RAIN ACROSS THE FORECAST AREA...CRITICAL THICKNESSES AND LINGERING DRIER AIR AT LOW LEVELS COULD ALLOW SOME MIXED RAIN AND SNOW EARLY ACROSS THE NORTH...ALTHOUGH NO SNOW ACCUMULATION WILL OCCUR. LOWS TONIGHT WILL RANGE FROM THE UPPER 30S NORTH TO THE LOWER 40S ALONG THE DOWNEAST COAST. DEEP MOISTURE...1000-500 MB LAYER AVERAGE RELATIVE HUMIDITIES OF 80-90 PERCENT...WILL PERSIST ACROSS THE REGION TUESDAY AND TUESDAY NIGHT. WITH THE APPROACH AND PASSAGE OF THE LOW OCCASIONAL RAIN WILL CONTINUE TUESDAY AND EARLY TUESDAY NIGHT. MODELS SHOW DRIER AIR STARTING TO OVERSPREAD NORTHERN AND WESTERN PORTIONS OF THE FORECAST AREA LATER TUESDAY NIGHT IN THE WAKE OF THE COLD FRONT. THUS...EXPECT RAIN WILL TAPER TO SCATTERED RAIN SHOWERS ACROSS NORTHERN AND WESTERN PORTIONS OF THE FORECAST AREA LATER TUESDAY NIGHT...WHILE A STEADIER RAIN PERSISTS DOWNEAST. HIGHS TUESDAY WILL RANGE FROM THE UPPER 40S NORTH TO 50 TO 55 DOWNEAST. LOWS TUESDAY NIGHT WILL RANGE FROM THE MID 30S NORTH TO THE LOWER 40S DOWNEAST. SCATTERED SHOWERS COULD LINGER EARLY WEDNESDAY...PARTICULARLY DOWNEAST. OTHERWISE...SKIES SHOULD BECOME PARTLY CLOUDY ACROSS THE REGION WITH DRIER AIR OVERSPREADING THE FORECAST AREA AND AN APPROACHING AREA OF HIGH PRESSURE. HIGHS WEDNESDAY WILL RANGE FROM THE UPPER 40S NORTH TO 50 TO 55 DOWNEAST. HIGH PRESSURE WILL CONTINUE TO BUILD TOWARD THE REGION WEDNESDAY NIGHT THEN CROSS THE AREA THURSDAY AND THURSDAY NIGHT. HIGH PRESSURE WILL MOVE TO THE EAST FRIDAY...WITH A FRONTAL BOUNDARY APPROACHING NORTHERN AREAS LATE. LOW PRESSURE SHOULD CROSS THE STATE SATURDAY...WITH HIGH PRESSURE RETURNING SUNDAY. COASTAL WATERS... WINDS WILL INCREASE TO GALE LEVELS LATER TONIGHT AND PERSIST TUESDAY THROUGH EARLY TUESDAY NIGHT. WINDS WILL BEGIN TO DIMINISH LATER TUESDAY NIGHT. VISIBILITIES WILL LOWER TONIGHT IN DEVELOPING AREAS OF RAIN AND FOG...WITH REDUCED VISIBILITIES PERSISTING THROUGH EARLY TUESDAY NIGHT. VISIBILITIES SHOULD BEGIN TO IMPROVE IN THE WAKE OF THE COLD FRONTAL PASSAGE LATER TUESDAY NIGHT. .CAR...GALE WARNING. NORCROSS