Area Forecast Discussion
Issued by NWS Boston, MA

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000 FXUS61 KBOX 062318 AFDBOX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TAUNTON MA 718 PM EDT WED MAY 6 2015 .SYNOPSIS... DRY WEATHER WITH UNSEASONABLY WARM AFTERNOON/S WILL CONTINUE INTO THIS WEEKEND. THE POTENTIAL FOR WET WEATHER AND LOWER TEMPERATURES MAY FINALLY ARRIVE EARLY NEXT WEEK. && .NEAR TERM /UNTIL 6 AM THURSDAY MORNING/...
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7 PM UPDATE...NO MAJOR CHANGES. HIGH PRESSURE OVERHEAD AND MAINLY CLEAR SKIES SHOULD LEAD TO A GOOD NIGHT OF RADIATIONAL COOLING. THAT SAID..STILL EXPECTING SEASONABLE MINIMUM TEMPERATURES. LOWS AROUND THE MID-40S.
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&& .SHORT TERM /6 AM THURSDAY MORNING THROUGH THURSDAY NIGHT/... HIGH PRESSURE REMAINS IN PLACE THURSDAY. WITH DRY AIR IN PLACE... EXPECTING TEMPERATURES TO RISE RATHER QUICKLY. A MORE MODEST SOUTHERLY FLOW SHOULD DEVELOP. IT IS MARGINAL IF THESE WINDS WILL BE STRONG ENOUGH TO COMPLETELY PRECLUDE SEA BREEZE DEVELOPMENT. ODDS ARE THERE WILL BE A PERIOD OF A SEA BREEZE ALONG THE EAST COAST OF MA. THINKING THE SOUTHERLY FLOW WILL WIN OUT BY LATE IN THE DAY...WHICH SHOULD ALLOW MAX TEMPERATURES TO APPROACH 80 DEGREES EVEN AT THE COAST. HIGH PRESSURE MOVES FARTHER OFFSHORE THURSDAY NIGHT. THERE IS A LOW PROBABILITY THIS COULD LEAD TO SOME MARINE STRATUS AND FOG ACROSS PORTIONS OF THE SOUTH COAST OF RI AND MA. THE MAIN QUESTION WILL BE THE AVAILABILITY OF LOW LEVEL MOISTURE. AT THIS JUNCTURE...DO NOT HAVE ENOUGH CONFIDENCE TO SOCK IN THE SOUTH COAST. THIS WILL BE SOMETHING WHICH WILL NEED TO BE WATCHED OVER THE NEXT 24 HOURS OR SO. && .LONG TERM /FRIDAY THROUGH WEDNESDAY/... */ HIGHLIGHTS... - AL 90 INVEST YIELDING SOME HEADACHES WITH THIS FORECAST - CONFIDENT SW-FLOW AND ABOVE-AVERAGE TEMPS INTO THE WEEKEND - S/SE-COASTAL ISSUES OVERNIGHT-MORNING WITH MARINE STRATUS / FOG - INCREASING WET WEATHER CHANCES INTO EARLY NEXT WEEK */ DISCUSSION... A GOOD PORTION OF THE FORECAST HINGES UPON THE EVOLUTION OF AL 90 INVEST. WOBBLING AROUND COASTAL CAROLINA PRIOR TO SLIPPING NE WITH THE MEAN-FLOW...THERE IS SOME CONSENSUS WITH REGARDS TO TRACK PER FORECAST GUIDANCE BUT NOTHING CLEAR ABOUT EVOLUTION NOR TIMING. AM THOUGH CERTAIN THAT ITS PRESENCE ENHANCES H5 RIDGING ACROSS THE NE CONUS THROUGH THE WEEKEND. SURFACE HIGH PRESSURE MAINTAINS OVER THE NW-ATLANTIC ALONG THE W-PERIPHERY SW-FLOW PREVAILS ADVECTING WARM- MOIST AIR N. SO LOOKING AT A WARMER-THAN-AVERAGE PERIOD OF MOSTLY DRY WEATHER. PERHAPS A COUPLE OF DAYS OF 90-DEGREE READINGS FOCUSED FROM FRIDAY-SUNDAY. SW-FLOW OF WARM-MOIST AIR OVER THE COOLER OCEAN IS LIKELY TO YIELD PERIODS OF MARINE-STRATUS / FOG AS MOISTURE POOLS BENEATH THE SUBSIDENCE INVERSION PER THE RIDGE. COULD WE SEE SOME DRIZZLE? NOT OUT OF THE QUESTION ESPECIALLY FOR THE S/SE-COAST AND ISLANDS. CHANCES FOR WET-WEATHER INCREASE INTO EARLY NEXT WEEK. A COOL FRONT EDGES SLOWLY E AHEAD OF WHICH THE WARM-MOIST AIRMASS PREVAILS. WITH AL 90 INVEST IN THE MIX ENHANCING THE RIDGING PATTERN...AM EXPECTING SUBSIDENCE AND DRY AIR TO SQUASH ANY DIURNALLY-FORCED ACTIVITY AHEAD OF THE FRONT ACROSS OUR REGION. BETTER CHANCES FOR SHOWERY WEATHER SHOULD BE ALONG THE FRONT WHERE THE BEST MOISTURE-LIFT-INSTABILITY RESIDE. COINCIDENT DEEP-LAYER MOISTURE ALONG WITH PWATS IN EXCESS OF 1.5-INCHES. IF RIDGING HOLDS KEEPING OUR REGION DRY PRIOR TO A PROMINENT TROUGH SIGNATURE PER ENSEMBLE SOLUTIONS BY MIDWEEK...THEN FLOODING CONCERNS THAT WERE DISCUSSED YESTERDAY MAY NOT BE A WORRY AFTER ALL. THE MEAN- LAYER FLOW IS STILL SW AROUND 25 MPH WITH A WEAK CORFIDI FLOW...BUT AS MENTIONED EARLIER...BETTER CONDITIONALLY UNSTABLE/MOIST ADIABATIC ENVIRONMENT IS N/W PUTTING THE OH-RIVER VALLEY INTO N NEW ENGLAND UNDER THE RISK. LOTS OF INTANGIBLES AND LOW CONFIDENCE AT THIS TIME. ANY ASPECT OF THE FORECAST /RIDGE - COOL FRONT - AL INVEST 90/ CAN WOBBLE YIELDING SIGNIFICANTLY DIFFERENT OUTCOMES. YET IF CONSENSUS OF FORECAST SOLUTIONS ARE CORRECT THEN THE TROUGH SWEEPING ACROSS OUR REGION RATHER QUICK UP AGAINST POTENTIALLY AL 90 INVEST WOULD YIELD NUISANCE WET WEATHER ACTIVITY. WAIT AND SEE. && .AVIATION /23Z WEDNESDAY THROUGH MONDAY/...
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FORECASTER CONFIDENCE LEVELS... LOW...LESS THAN 30 PERCENT. MODERATE...30 TO 60 PERCENT. HIGH...GREATER THAN 60 PERCENT. SHORT TERM /TODAY THROUGH THURSDAY NIGHT/... VFR. SKC. LIGHT WINDS OVERNIGHT INTO THURSDAY. SEA-BREEZES DEVELOPING BY LATE MORNING ERODING INTO EVENING. KBOS TAF...HIGH CONFIDENCE IN TAF. KBDL TAF...HIGH CONFIDENCE IN TAF. OUTLOOK...FRIDAY THOUGH MONDAY... VFR. SW-FLOW. BREEZY AT TIMES. IFR MARINE STRATUS / FOG AT TIMES ALONG THE S/SE-SHORELINE TERMINALS DURING OVERNIGHT-MORNING PERIODS. INCREASING CHANCES FOR -SHRA TOWARDS MONDAY.
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&& .MARINE... FORECASTER CONFIDENCE LEVELS... LOW...LESS THAN 30 PERCENT. MODERATE...30 TO 60 PERCENT. HIGH...GREATER THAN 60 PERCENT. SHORT TERM /TODAY THROUGH THURSDAY NIGHT/... HIGH CONFIDENCE. HIGH PRESSURE NEARBY WILL KEEP WINDS AND SEAS BELOW SMALL CRAFT ADVISORY THRESHOLDS THROUGH THURSDAY NIGHT. SEAS GENERALLY 1 TO 3 FEET WITH GOOD VISIBILITY. OUTLOOK...FRIDAY THOUGH MONDAY... WINDS AND SEAS REMAINING BELOW SMALL-CRAFT ADVISORY CRITERIA. EXPECT BREEZY SW-FLOW AHEAD OF AN APPROACHING COOL FRONT INTO EARLY NEXT WEEK AHEAD OF WHICH MARINE STRATUS / FOG MAY BE AN ISSUE ALONG THE S/SE-SHORE-LINE DURING THE OVERNIGHT INTO MORNING PERIODS. DRY FORECAST OVERALL WITH JUST A CHANCE OF SHOWER ACTIVITY BEGINNING MONDAY. && .FIRE WEATHER... DRY WEATHER WILL CONTINUE THROUGH AT LEAST SATURDAY...IF NOT INTO SUNDAY. MINIMUM AFTERNOON RELATIVE HUMIDITY VALUES WILL DROP TO BETWEEN 15 AND 25 PERCENT THIS AFTERNOON AND AGAIN THURSDAY AFTERNOON. WHILE WINDS WILL PROBABLY NOT BE STRONG ENOUGH THROUGH THE REST OF THIS WORK WEEK FOR FIRE WEATHER HEADLINES...WE MAY HAVE TO BE MORE CONCERNED THIS WEEKEND IF IT REMAINS DRY. && .BOX WATCHES/WARNINGS/ADVISORIES... CT...NONE. MA...NONE. RI...NONE. MARINE...NONE. && $$ SYNOPSIS...BELK/SIPPRELL NEAR TERM...BELK/SIPPRELL SHORT TERM...BELK LONG TERM...SIPPRELL AVIATION...BELK/SIPPRELL MARINE...BELK/SIPPRELL FIRE WEATHER...WFO BOX STAFF

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