National Weather Service National Headquarters

• Home
• Site Map
• News
• Organization
• Search for: NWS All NOAA 

-- Discussion containing changed information from previous version are highlighted. --
000
FXUS61 KAKQ 210807
AFDAKQ

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE WAKEFIELD VA
407 AM EDT MON APR 21 2014

.SYNOPSIS...
-- Changed Discussion --
LOW PRESSURE OFF THE CAROLINA COAST...WILL TRACK SLOWLY NORTHEAST
INTO THE ATLANTIC THROUGH TODAY...AS HIGH PRESSURE SLIDES OFF THE
NEW ENGLAND COAST. A COLD FRONT WILL CROSS THE AREA TUESDAY
AFTERNOON INTO TUESDAY NIGHT. HIGH PRESSURE RETURNS FOR WEDNESDAY
AND THURSDAY.
-- End Changed Discussion --

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
-- Changed Discussion --
LO PRES OFF THE CAROLINA CST EARLY THIS MORNG...WILL MOVE SLOWLY
NE INTO THE ATLC DURING TODAY. CLOUDS WILL LINGER OVR EXTRM SE VA
AND NE NC FOR A WHILE THIS MORNG...ALONG WITH A SLGT CHC OF RAIN
OVR NE NC CNTIES NEXT TO THE ALBEMARLE SND AND ATLC OCEAN.
OTHERWISE...THE SKY WILL BE PARTLY OR MOSTLY SUNNY TODAY...AS THE
LO SLIDES FARTHER INTO THE ATLC AND UPR LVL RDG BLDS OVR THE
REGION. HI TEMPS WILL RANGE FM THE UPR 50S TO LWR 60S ALNG THE
CST/NEAR THE WTR...TO THE MID 60S TO NEAR 70 INLAND.
-- End Changed Discussion --

&&

.SHORT TERM /6 PM THIS EVENING THROUGH WEDNESDAY/...
-- Changed Discussion --
COLD FRONT TRACKING INTO THE OH VLY MON EVENG...WILL PUSH E AND
OVR THE MTNS TUE MORNG. THAT FRONT WILL BRING INCREASING CLOUDS FM
W TO E TUE...ALONG WITH A CHC FOR SHOWERS. MOST OF IF NOT ALL THE
SHOWERS MAY HOLD OFF UNTIL THE AFTN W...AND TWD LATE AFTN/EVENG E
ON TUE. WILL MAINTAIN A SLGT CHC OF A TSTM...THOUGH DYNAMICS
WEAKENING WITH TIME...AS THE FRONT ENTERS THE AREA. LO TEMPS MON
NGT WILL RANGE FM THE MID 40S TO NEAR 50. HI TEMPS ON TUE WILL
RANGE FM THE MID TO UPR 70S INLAND...TO THE UPR 60S TO LWR 70S AT
THE CST.

THE COLD FRONT WILL PUSH OUT TO SEA TUE NGT...WITH SGFNT DRYING
AND A PERIOD OF COOLING THEREAFTER (FM AFTR MIDNGT TUE NGT THRU WED).
MAINTAINING 30-40% POPS ERN PORTION OF THE FA TUE EVENG...15-25%
ELSEWHERE...THEN CLEARING AFTR MIDNGT...AS WINDS BECOME NW. NEAR
SEASONABLE/CLEAR-PRTLY CLOUDY WX THEN EXPECTED WED WITH GUSTY NW
WINDS...MAINLY ERN PORTION. LO TEMPS TUE NGT RANGING FM THE MID
40S NW TO THE LWR 50S SE. HI TEMPS ON WED WILL RANGE THRU THE 60S.
-- End Changed Discussion --

&&

.LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/...
PROGRESSIVE FLOW WILL RESULT IN NEAR SEASONABLE NORMAL TEMPS AND
GENERALLY DRY CONDITIONS THROUGH THE EXTENDED PERIOD FORECAST. A
COLD FRONT WILL BRING A CHANCE OF SHOWERS TO THE REGION FRIDAY
AFTERNOON INTO FRIDAY NIGHT.

TROUGH AXIS WILL PUSH OFF THE NE COAST WEDS NIGHT AS AN UPPER
LEVEL RIDGE BUILDS EWD OVER THE CNTRL-ERN CONUS. AT THE SFC...COOL
CANADIAN HIGH PRESSURE WILL BUILD SEWD FROM THE GREAT LAKES INTO
THE MID-ATLANTIC REGION WEDS NIGHT-THURS. THIS WILL RESULT IN
ANOTHER COOL DAY THURS (HIGHS GENERALLY IN THE MID-UPPER 60S) AS
FLOW REMAINS NW-W. SFC HIGH WILL SLIDE OVER THE LOCAL AREA THURS-
LATE THURS...LOCATING OFFSHORE THURS NIGHT. THIS WILL VEER THE
FLOW AROUND TO THE SOUTH AS THE UPPER RIDGE AXIS BUILDS OVERHEAD.
MEDIUM RANGE GUIDANCE IS COMING INTO BETTER AGREEMENT...BUT
CONTINUE TO STRUGGLE WITH THE EVOLUTION OF AN UPPER TROUGH OVER
THE INTERMOUNTAIN WEST INTO THE NRN PLAINS THURS-THURS NIGHT.
HOWEVER...GUIDANCE IS IN FAIRLY GOOD AGREEMENT WITH LIFTING A WARM
FRONT OVER THE REGION IN THE AMPLIFYING FLOW. TRAILING COLD FRONT
FORECAST TO CROSS THE REGION FRIDAY AFTERNOON. WLY FLOW OVER THE
SRN PLAINS INTO THE GULF STATES WILL LIMIT THE AMOUNT OF MOISTURE
ADVECTION INTO THE REGION...ESPECIALLY EAST OF THE APPALACHIANS.
DEWPOINTS ONLY PROGGED TO WARM INTO THE LOW-MID 50S FRI. BEST
DYNAMICS WILL ALSO REMAIN NORTH OF THE LOCAL AREA AS ZONAL FLOW
PREVAILS OVER THE LOCAL AREA. HOWEVER...INCREASING SPEEDS ALOFT
AND SMALL AMPLITUDE SHORTWAVES WILL BE ENOUGH TO MENTION SLIGHT
CHANCE-LOW END CHANCE POPS ALONG THE FRONT ATTM. WITH THE LOCAL
AREA IN THE WARM SECTOR FRI...TEMPS WILL WARM INTO THE MID-UPPER
70S (NEAR 80 INLAND). WARM TEMPS COMBINED WITH LOW LEVEL THETA-E
ADVECTION WILL MAINTAIN A MARGINALLY UNSTABLE AIRMASS OVER THE
REGION FRI AFTERNOON. THUS WILL CARRY A SLIGHT CHANCE OF THUNDER.
SRN PORTION OF THE FRONT WILL LIKELY STALL OVER THE CAROLINAS FRI
NIGHT-SAT IN WLY FLOW ALOFT. COOL CANADIAN HIGH PRESSURE WILL BE
SLOW TO BUILD OVER THE REGION AS THE TROUGH REMAINS OVER THE NE
STATES THRU THE WEEKEND. THIS WILL RESULT IN ANOTHER WARM DAY SAT
WITH HIGHS IN THE MID-UPPER 70S IN WLY FLOW. COOLER SUNDAY AS COOL
CANADIAN HIGH PRESSURE FINALLY BUILDS SEWD OVER THE REGION.

&&

.AVIATION /07Z MONDAY THROUGH FRIDAY/...
THE PRESSURE GRADIENT BETWEEN HIGH PRESSURE OVER NEW ENGLAND AND LOW
PRESSURE WELL OFF THE CAROLINA COAST WILL CONTINUE TO SLOWLY
WEAKEN THROUGH THE TAF PERIOD. HELD ON TO MVFR AT ECG AND ORF
EARLY THIS MORNING. CIGS QUICKLY IMPROVE TO VFR ACROSS SE
TERMINALS BY MID-MORNING, WITH SOME GUSTS TO 20 KT THROUGH
MIDDAY.

OUTLOOK...SOME PATCHY FOG IS PSBL TUESDAY MORNING BUT CURRENT
INDICATIONS DO NOT POINT TO WIDESPREAD IFR. AS A COLD FRONT MOVES
THROUGH...THERE IS A GOOD CHANCE FOR SHOWERS AND A FEW
THUNDERSTORMS TUESDAY AFTN AND EVENING. HIGH PRESSURE RETURNS
WEDNESDAY AND THURSDAY. THERE WILL ONCE AGAIN BE A CHANCE FOR
SHOWERS AND THUNDERSTORMS ON FRIDAY.

&&

.MARINE...
-- Changed Discussion --
LATEST OBS REFLECT CONTINUED NE WINDS OVER THE WATERS THIS MORNING.
WINDS HAVE DIMINISHED SLIGHTLY OVER THE PAST FEW HOURS AS LOW
PRESSURE SLOWLY PUSHES E-NE AWAY FROM THE SOUTHEAST COAST THIS
MORNING AND HIGH PRESSURE PUSHES OFF THE NE COAST. HV DROPPED SCA
OVER THE YORK/RAPPAHANNOCK/UPPER JAMES WITH AM PACKAGE ISSUANCE.
HOWEVER, WITH SFC LOW STILL SLOWLY PUSHING FARTHER OFFSHORE, SCA
WILL REMAIN IN PLACE OVER THE BAY AND LOWER JAMES UNTIL MID-MORNING,
AND THE MOUTH OF THE BAY (FOR SEAS AND GUSTS TO 20 KT) AND CURRITUCK
SOUND THROUGH THIS AFTN. STILL NOTING SEAS OF 8-12FT OVER THE
COASTAL WATERS EARLY THIS MORNING, AND SEAS WILL BE SLOW TO DIMINISH
TODAY THROUGH TONIGHT. THUS SCA REMAINS IN PLACE OVER THE ATLANTIC
COASTAL WATERS UNTIL LATE TONIGHT.

SFC LOW WILL PUSH FARTHER OUT TO SEA THROUGH TONIGHT AS HIGH
PRESSURE REMAINS RIDGED OVER THE WATERS. SEAS WILL SUBSIDE TO 4-8 FT
BY THIS AFTN. FLOW VEERS AROUND TO THE SOUTH TONIGHT, IN ADVANCE OF
A COLD FRONT APPROACHING FROM THE WEST. SEAS FINALLY FALL BELOW 5FT
BY TUE MORNING. COULD HAVE A FEW GUSTS TO LOW END SCA OVER THE
BAY/SND IN S-SW FLOW AHEAD OF THE FRONT ON TUESDAY, BUT EXPECT
PREDOMINATE CONDITIONS TO BE SUB-SCA. THE FRONT CROSSES THE WATERS
TUESDAY NIGHT, WITH A PERIOD OF SCA EXPECTED WITH RESULTANT N-NWLY
CAA SURGE LATE TUESDAY NIGHT AND WEDNESDAY. AFTER A SHORT LIVED
SECONDARY SURGE WED NGT, QUIETER MARINE CONDITIONS ARE EXPECTED AS
HIGH PRESSURE BUILDS OVER THE AREA FROM THE WEST THU.
-- End Changed Discussion --

&&

.AKQ WATCHES/WARNINGS/ADVISORIES...
-- Changed Discussion --
MD...NONE.
NC...HIGH SURF ADVISORY UNTIL 4 AM EDT EARLY THIS MORNING FOR
     NCZ102.
VA...NONE.
MARINE...SMALL CRAFT ADVISORY UNTIL 4 AM EDT EARLY THIS MORNING FOR
     ANZ635>637.
     SMALL CRAFT ADVISORY UNTIL 4 PM EDT THIS AFTERNOON FOR ANZ633-
     634.
     SMALL CRAFT ADVISORY UNTIL 10 AM EDT THIS MORNING FOR
     ANZ630>632-638.
     SMALL CRAFT ADVISORY UNTIL 6 AM EDT TUESDAY FOR ANZ650-652-654-
     656-658.
-- End Changed Discussion --

&&

$$
SYNOPSIS...TMG
NEAR TERM...TMG
SHORT TERM...ALB/TMG
LONG TERM...SAM
AVIATION...MAM
MARINE...MAM