Area Forecast Discussion
Issued by NWS Boston, MA

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000 FXUS61 KBOX 181728 AFDBOX Area Forecast Discussion National Weather Service Taunton MA 128 PM EDT Wed Oct 18 2017 .SYNOPSIS... High pressure will maintain dry weather and warmer than normal temperatures through the weekend. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... 940 AM update... Mid level ridging moves into New Eng today with rather dry column and moderating temps aloft. Expect a nice recovery in temps this afternoon. Current forecast on track. Previous Discussion... High pressure builds south of New England today, resulting in plenty of sunshine and milder W/SW flow with highs in the 60s and lower 70s. Once again today there is possibility of weak sea breeze along eastern MA coast later this afternoon, mainly from 3-6 pm as gradient weakens for a time. Forecast soundings show winds slackening through lowest 2kft and heating over land should create enough land/sea differential for sea breeze development. && .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM THURSDAY/... Tonight starts off clear but model cross sections show potential for some low clouds to develop across NE CT, RI, and SE MA due to persistent SW flow and increasing low level moisture. Not entirely confident this will occur, as high-res models can overdo cloud cover in these situations, so for now we simply trended forecast to indicate some cloudiness in these areas. Any low clouds should burn off quickly Thu morning, followed by plenty of sunshine and increasing SW winds. Highs should end up a few degrees warmer than today, mainly in low to mid 70s, except 60s near south coast, Cape Cod, and Islands. This will fall a bit short of tomorrow`s record highs which are in the low to mid 80s (BOS 84 in 1945, PVD 83 in 2016, BDL 82 in 1963, ORH 81 in 1963). && .LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/... Highlights... * Above average temperatures and dry conditions lasting into this weekend * Next shot for rainfall appears to be around Tuesday Not much has changed with this portion of the forecast. High pressure remains in control through much of this period. Continue to favor a consensus approach to smooth over the less predictable details. A weak cold front sweeps through southern New England Thursday night. However, the air mass still appears that it will be too dry to generate showers. Even though temperatures should be a little lower Friday, still expecting above normal temperatures to prevail through this period. A stronger cold front should approach toward the middle of next week. That is our next decent chance for rainfall. Timing of this front is not certain, but currently looks to be sometime Monday night into Tuesday. && .AVIATION /17Z WEDNESDAY THROUGH SUNDAY/... Forecaster Confidence Levels... Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Short Term /through Thursday night/...Generally high confidence. Mainly VFR. A few IFR SCT-BKN CIGS possible mainly E CT into RI, including PVD after 06Z tonight through 12Z. Confidence too low for TAF at this time, but will hint at it. VFR then returns tomorrow and most of tomorrow night. SW flow expected today through the daylight tomorrow, then gradual shift to the W is expected tomorrow evening/overnight. KBOS Terminal...High confidence in TAF. KBDL Terminal...Moderate confidence in TAF. Although VFR dominates there is a low risk for some low CIGS around IFR late tonight into early tomorrow morning. Outlook /Thursday Night through Sunday/... Thursday: VFR. Breezy. Thursday Night: VFR. Windy with local gusts to 30 kt. Friday: VFR. Breezy. Friday Night through Sunday: VFR. && .MARINE... Forecaster Confidence Levels... Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Short Term /through Thursday/...High confidence. Maintaining SCA for outer waters from Stellwagen Bank to east of Cape Cod, due to lingering 25kt winds and 5-6 ft seas this morning. Otherwise high pressure building south of New England will result in SW flow through Thursday, which should build seas on south coastal waters to 5-6 ft during afternoon. May need to issue another round of SCA if it becomes more likely. Outlook /Thursday Night through Sunday/...High confidence. High pressure lingers across the waters through much of this period, resulting in rather tranquil boating conditions. The exception to this would be Thursday night into Friday, when a weak cold front crosses the waters. Small Craft Advisories may be needed during that period. && .BOX WATCHES/WARNINGS/ADVISORIES... CT...None. MA...None. RI...None. MARINE...None. && $$ SYNOPSIS...Belk/JWD NEAR TERM...KJC/JWD SHORT TERM...JWD LONG TERM...Belk AVIATION...Belk/Doody MARINE...Belk/JWD

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