Area Forecast Discussion
Issued by NWS Boston, MA

Current Version | Previous Version | Text Only | 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
000
FXUS61 KBOX 281835
AFDBOX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TAUNTON MA
235 PM EDT MON JUL 28 2014

.SYNOPSIS...
A RATHER STRONG AREA OF LOW PRESSURE BY JULY STANDARDS WILL MOVE
ACROSS NORTHERN NEW ENGLAND THIS EVENING WITH ITS ATTENDING COLD
FRONT SWEEPING ACROSS THE REGION LATER TONIGHT AND THEN OFFSHORE
TUE. MAINLY DRY AND LESS HUMID WEATHER FOLLOWS FOR THE REMAINDER
OF THE WORK WEEK. THIS WEEKEND THE FRONT OFFSHORE MAY BUILD BACK
INTO NEW ENGLAND ALONG WITH A WAVE OF LOW PRESSURE. THIS WILL
RESULT IN THE RISK OF SHOWERS AND MORE HUMID WEATHER.

&&

.NEAR TERM /THROUGH TONIGHT/...

*** FEW STRONG/SEVERE STORMS THIS AFTERNOON ***

1135 AM UPDATE...
JUST MINOR TWEAKS TO THE FORECAST THIS MORNING. SUNSHINE HAS
BROKEN THROUGH THE CLOUDS...ESPECIALLY ACROSS SOUTHEAST MA. WILL
CONTINUE TO MONITOR THE THREAT OF ADDITIONAL SHOWERS AND STORMS
LATER THIS AFTERNOON.

PREVIOUS DISCUSSION...

ONCE THIS INITIAL ROUND OF SHOWERS/STORMS LIFTS N BY EARLY
AFTERNOON...ATTENTION THEN TURNS TO POSSIBLE REDEVELOPMENT OF
SCATTERED SHOWERS/STORMS.

MODELS INSISTENT THAT DRY SLOT WILL WORK ITS WAY UP COAST INTO SE
NEW ENGLAND...AND DEEPER MOISTURE SHOULD RESIDE ACROSS INTERIOR AS
SEEN IN K-INDEX FIELDS. INSTABILITY IS IN QUESTION AS WE ARE NOT
CONFIDENT ON HOW MUCH CLEARING WILL OCCUR...IF AT ALL. BUT
CONTINUED PRESENCE OF HIGH 0-6KM SHEAR /OVER 35KT/ AND GOOD LOW
LEVEL TURNING IN FORECAST HODOGRAPHS SUGGESTS POTENTIAL FOR AT
LEAST FEW STRONG OR SEVERE STORMS THIS AFTERNOON. DAMAGING WINDS
AND HAIL ARE MAIN THREATS...BUT WE CANNOT RULE OUT AN ISOLATED
WEAK TORNADO GIVEN HIGHLY SHEARED ENVIRONMENT...LOW LCL/S AND
PRESENCE OF CLOSED UPPER LOW. SYSTEM ALSO HAS HISTORY OF PRODUCING
A FEW WEAK TORNADOES THUS FAR AS WELL.

GIVEN UNCERTAINTY IN AMOUNT OF HEATING...STAYED CLOSE TO MODEL
BLEND FOR HIGHS TODAY /70S TO AROUND 80/ WHICH ALSO MATCHES MIXING
TO 850 MB /10-11C/.

&&

.SHORT TERM /TUESDAY THROUGH TUESDAY NIGHT/...
COLD FRONT PUSHES THROUGH REGION TONIGHT BRINGING MUCH LESS HUMID
AIR BY DAYBREAK AS SKIES CLEAR. LIGHT WINDS WITH LEFTOVER MOISTURE
MAY LEAD TO PATCHY FOG ACROSS INTERIOR.

RIDGE OF HIGH PRESSURE BUILDS OVER NEW ENGLAND TUE...RESULTING IN
PLENTY OF SUNSHINE. NOT MUCH OF AIRMASS CHANGE SO HIGHS ONCE AGAIN
SHOULD TOP OFF IN 70S TO AROUND 80 BUT WITH LOW HUMIDITY. WEAK
GRADIENT SUPPORTS AFTERNOON SEA BREEZES ALONG BOTH COASTS.

&&

.LONG TERM /WEDNESDAY THROUGH SUNDAY/...

HIGHLIGHTS...

* MAINLY DRY/QUIET AND SEASONABLE WEATHER WED THRU FRI
* POSSIBLY UNSETTLED AND MORE HUMID THIS WEEKEND

WEDNESDAY THRU FRIDAY...

LONG WAVE TROUGH REMAINS OVER THE NORTHEAST EARLY THIS PERIOD
HOWEVER THE MEAN MID LEVEL TROUGH AXIS IS FAR ENOUGH EAST TO KEEP
THE DEEP PLUME OF SUBTROPICAL MOISTURE OFFSHORE. THUS MAINLY DRY
WEATHER WILL PREVAIL WED THRU FRI. HOWEVER GIVEN COOL TEMPS ALOFT
COMBINED WITH CYCLONIC MID LEVEL FLOW CAN/T RULE OUT A LOW RISK OF A
FEW DIURNAL SHOWERS/T-STORMS INLAND.

AS FOR TEMPS...GIVEN THE BELOW NORMAL 500 HEIGHTS EXPECT LATE
JULY/EARLY AUG SUN ANGLE TO PROVIDE MILD DAYS BUT DEW PTS IN THE 50S
WILL YIELD COMFORTABLY COOL NIGHTS.

THIS WEEKEND...

NORTHEAST TROUGH RETROGRADES TO THE MS VLY THIS WEEKEND. THIS OPENS
THE DOOR FOR TROPICAL MOISTURE AND THE OFFSHORE FRONT TO BACK INTO
NEW ENGLAND...ESPECIALLY EASTERN MA AND RI. THIS WILL INCREASE THE
RISK FOR SHOWERS AND T-STORMS ALONG WITH MORE HUMID CONDITIONS.

&&

.AVIATION /19Z MONDAY THROUGH SATURDAY/...
FORECASTER CONFIDENCE LEVELS...

LOW...LESS THAN 30 PERCENT.
MODERATE...30 TO 60 PERCENT.
HIGH...GREATER THAN 60 PERCENT.

MODERATE CONFIDENCE ON TRENDS TODAY. HIGH CONFIDENCE TONIGHT AND
MONDAY.

SCATTERED IFR IN LOW CLOUDS AND FOG...OTHERWISE VFR DEVELOPING
ACROSS SOUTHEAST MA AND RI.

SCATTERED SHOWERS/TSTMS SHOW REDEVELOP ACROSS THE INTERIOR AFTER
18Z. EXPECT MVFR CIGS/VSBYS IN ANY TSTMS. BEST CHANCE FOR TSTMS
WILL BE IN AREAS ALONG/WEST/NORTH OF I-495. THERE WILL BE
POTENTIAL FOR SOME OF THE STORMS IN THIS AREA TO PRODUCE STRONG OR
DAMAGING WIND GUSTS.

IMPROVING CONDITIONS TO VFR AFTER 00Z TUE...ALTHOUGH PATCHY
MVFR/IFR POSSIBLE IN FOG. VFR TUE WITH AFTERNOON SEA BREEZES.

KBOS TAF...MODERATE CONFIDENCE. IFR CIGS/VSBYS...FAIRLY CONFIDENT
ON IMPROVING CONDITIONS AFTER 15Z. TS SHOULD REMAIN W OF AIRPORT
18Z-22Z.

KBDL TAF...MODERATE CONFIDENCE. LIFR CIGS/VSBYS...FAIRLY
CONFIDENT IN IMPROVING CONDITIONS AFTER 13Z. TS MOST LIKELY 18Z-
22Z.

OUTLOOK...WEDNESDAY THROUGH SATURDAY...HIGH CONFIDENCE THRU FRI
THEN LOWER CONFIDENCE INTO THIS WEEKEND.

VFR EXPECT A LOW RISK FOR PATCHY IFR IN EARLY MORNING FOG EACH DAY.
MVFR CIGS/VSBYS IN WIDELY SCATTERED AFTERNOON TSTMS MAINLY WEST OF
MHT AND ORH. BY SAT CHANCE OF MVFR/IFR COMING ONSHORE INTO EASTERN
MA AND RI ALONG WITH THREAT OF SHOWERS. MARGINAL VFR-MVFR LIKELY
ELSEWHERE.

&&

.MARINE...
FORECASTER CONFIDENCE LEVELS...

LOW...LESS THAN 30 PERCENT.
MODERATE...30 TO 60 PERCENT.
HIGH...GREATER THAN 60 PERCENT.

MODERATE CONFIDENCE THROUGH TUE. MAIN CONCERN IS FOR ROUGH SEAS ON
S COASTAL WATERS WHERE SCA HAS BEEN EXTENDED INTO TUE.

S/SW FLOW PREVAILS TODAY WHICH WILL LEAD TO BUILDING SEAS ON S
COASTAL WATERS...REACHING AS HIGH AS 5 OR 6 FT OFFSHORE THIS
AFTERNOON. THIS WILL ALSO MAINTAIN PATCHY DENSE FOG THIS MORNING
ON S COASTAL WATERS.

SHOWERS/STORMS WILL MOVE ACROSS WATERS THIS MORNING FROM LONG
ISLAND. SO FAR THESE STORMS HAVE PRODUCED FREQUENT LIGHTNING AND
MAY PRODUCE STRONG WIND GUSTS TO 35KT. POSSIBILITY OF A FEW MORE
STORMS THIS AFTERNOON...ESPECIALLY ON E MA WATERS.

COLD FRONT APPROACHES WATERS TONIGHT BUT EXPECT ANOTHER ROUND OF
PATCHY DENSE FOG...AT LEAST EARLY TONIGHT BEFORE DRIER AIR ARRIVES
OVERNIGHT. HIGH PRESSURE BUILDS OVERHEAD TUE WITH LIGHT WINDS AND
AFTERNOON SEA BREEZES. SEAS SLOWLY SUBSIDE OFFSHORE.

OUTLOOK...WEDNESDAY THROUGH SATURDAY...MODERATE CONFIDENCE.

FAIRLY LIGHT WINDS AND SEAS WED THRU FRI THEN SE WINDS POSSIBLY
INCREASING SAT PENDING STRENGTH AND TRACK OF FRONTAL WAVE MOVING NE
FROM THE MID ATLC. FAIR VSBY WED THRU FRI THEN POSSIBLY LOWERING SAT
IN SHOWERS AND FOG.

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...NONE.
MA...NONE.
NH...NONE.
RI...NONE.
MARINE...SMALL CRAFT ADVISORY FOR HAZARDOUS SEAS UNTIL 2 PM EDT TUESDAY
     FOR ANZ235-237-250-254>256.

&&

$$
SYNOPSIS...NOCERA
NEAR TERM...BELK
SHORT TERM...BELK
LONG TERM...NOCERA
AVIATION...BELK/NOCERA
MARINE...BELK/NOCERA



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.