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Area forecast discussion 
National Weather Service Taunton Massachusetts 
403 am EDT Fri Oct 20 2017 

high pressure will move from the Appalachians today to a 
position east of New England on Sunday. It will provide dry 
and much warmer than normal temperatures through the weekend. 
The risk of showers will increase by the middle of next week. 


Near term /until 6 PM this evening/... 
3 am update... 

Satellite imagery shows that the upper level trough axis has 
shifted east of the region. A band of thick cirrus clouds over 
southern New England was beginning to pull out to the east. 
It should be mainly off the coast by daybreak, leaving mostly 
sunny skies across our area. At the surface, a weak, dry cold 
front will move through as a wind shift, with winds shifting to 
west toward daybreak and then to the northwest during the day 
today. Wind gusts to 20 mph are expected for a time late this 
morning and into the mid afternoon hours. 

Mixing during the day will reach 925 mb or a little higher, 
similar to yesterday, with temperatures at that level supporting 
Max sfc temps around 70, except mid 60s in the slopes of the 
Berkshires and on Nantucket. 


Short term /6 PM this evening through 6 PM Saturday/... 
skies will be clear and winds will be light. It will be on the 
chilly side with lows in the upper 30s to mid 40s, except mid 40s 
to lower 50s Cape Cod and the islands. 


* very warm weather, but may fall short of record highs 

High pressure will become centered just south of southern New 
England. An upper level ridge along the East Coast will build 
into the region. 925 mb temperatures will reach +17c during the 
afternoon. With full sunshine, am expecting highs in the mid to 
upper 70s, but cannot rule out a high near 80 in Hartford 
County. Should be cooler...in the 60s to lower 70s...along the 
South Coast, Cape Cod, and the islands with southwest flow. 

Record highs are 80 at Worcester, 81 at Providence, and 82 at 
Hartford and Boston...all set back in 1920. 


Long term /Saturday night through Thursday/... 

* warm and dry weather lasting into Monday 
* unsettled weather pattern with showers at times Tue into Thu 

20/00z guidance coming into better agreement on the upcoming 
pattern change later next week. Still some detail differences, 
with the CMC remaining the odd model out after Tuesday. Will 
continue to favor a consensus blend approach to smooth over the 
less predictable details. Have high confidence in the forecast 
through Monday, dropping to low confidence in the details after 

Strong mid level ridge along the eastern Seaboard will finally 
be replaced by a deep trough during the middle of next week. 
Still expecting temperatures to be above normal for late 
October, but the trend will be downward after Monday. 

Our prolonged dry spell also appears it will come to an end 
during the middle of next week. Depending upon how quickly a 
cold front can move east, which is not a given with a strong 
high pressure over the North Atlantic, we could see periods of 
showers lingering from Monday night through the end of next 
week. This would be a greater possibility if a low pressure 
develops along this front by Wednesday. 

Still thinking the greatest risk for widespread showers 
will be ahead of a cold front Tuesday into Wednesday. 


Aviation /08z Friday through Tuesday/... 
forecaster confidence levels... 

Low - less than 30 percent. 
Moderate - 30 to 60 percent. 
High - greater than 60 percent. 

Short term /through Saturday/...generally high confidence. 

3 am update... 

Any isolated fog patches, especially in the CT River Valley, 
will dissipate first thing after sunrise. Otherwise VFR 
conditions through Saturday. Just an isolated fog patch or two 
late tonight in the normally colder spots. Northwest winds will 
pick up a little, with late morning and afternoon gusts near 20 
knots today. Winds then diminish with sunset and will be light 
through Saturday. 

Kbos terminal...high confidence in taf. 

Kbdl terminal...high confidence in taf. 

Outlook /Saturday night through Tuesday/... 

Saturday night through Sunday night: VFR. 
Monday: VFR. Slight chance rain showers. 
Monday night: mainly VFR, with local MVFR possible. Chance 
rain showers. 
Tuesday: mainly MVFR, with local IFR possible. Breezy. Rain showers. 


forecaster confidence levels... 

Low - less than 30 percent. 
Moderate - 30 to 60 percent. 
High - greater than 60 percent. 

Short term /through Saturday/...high confidence. 

3 am update... 

Today...northwest winds will gust to around 20 knots during the 
day. Seas will be near 5 ft early this morning on the southern 
outer waters but seas will subside to 3 to 4 ft throughout all 
outer waters during the day. Have kept a Small Craft Advisory 
posted for the southern outer waters through 10 am this morning. 

Tonight and Saturday...ideal boating weather. Winds remain 15 
knots or less, and seas mainly 2 ft or less. Wind direction will 
shift from the north tonight to the southwest on Saturday. 

Outlook /Saturday night through Tuesday/...high confidence. 

Saturday night through Sunday night: winds less than 25 kt. 
Monday: winds less than 25 kt. Seas locally approaching 5 ft. 
Monday night: winds less than 25 kt. Seas locally approaching 
5 ft. Slight chance of rain showers. 
Tuesday: low risk for Small Craft Advisory winds with gusts up 
to 25 kt. Local rough seas. Chance of rain showers. 


Fire weather... 
will reissue the Special Weather Statement highlighting a 
risk of only marginally elevated fire weather potential for 
today. Northwest winds may gust up to 20 mph at times late this 
morning through the mid-afternoon hours. We are not expecting 25 
mph or higher gusts. Minimum relative humidity values will reach 30-35 percent 
across much of the region. These values, combined with the lack 
of recent rainfall will lead to a marginally elevated fire 
weather potential for today. 


record high temperatures for Saturday, October 21: 
bos 82 in 1920 
bdl 82 in 1920 
pvd 81 in 1920 
orh 80 in 1920 


Box watches/warnings/advisories... 
Rhode Island...none. 
Marine...Small Craft Advisory until 10 am EDT this morning for anz255- 


near term...field 
short term...field 

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