Area Forecast Discussion
Issued by NWS Boston, MA

Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
-- Highlight Changed Discussion --
-- Discussion containing changed information from previous version are highlighted. --
000 FXUS61 KBOX 181131 AFDBOX Area Forecast Discussion National Weather Service Taunton MA 731 AM 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/...
-- Changed Discussion --
No major changes to the forecast this morning. Brought the forecast back in line with observed trends. Previous Discussion... Starting to see wide range in temperatures this morning, with 30s showing up where winds have gone calm and 40s where light SW winds prevail. Expect to see some fluctuations through sunrise but frost threat will be very limited. 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.
-- End Changed Discussion --
&& .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 /12Z WEDNESDAY THROUGH SUNDAY/...
-- Changed Discussion --
Forecaster Confidence Levels... Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Short Term /through Thursday/...High confidence. VFR. Exception is across NE CT, RI, and SE MA late tonight into Thu morning where we may see IFR ceilings develop, including KPVD. SW flow expected today through Thu, though weak sea breeze is once again possible along E MA coast for a few hours later this afternoon. If it occurs, it would be roughly from 19z to 22z. KBOS Terminal...High confidence in TAF. Low chance of weak sea breeze 19z-22z but am more confident in S/SW winds during that time. KBDL Terminal...High confidence in TAF. 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.
-- End Changed Discussion --
&& .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...Small Craft Advisory until 11 AM EDT this morning for ANZ250- 254. && $$ SYNOPSIS...Belk/JWD NEAR TERM...Belk/JWD SHORT TERM...JWD LONG TERM...Belk AVIATION...Belk/JWD MARINE...Belk/JWD is the U.S. government's official web portal to all federal, state and local government web resources and services.