Area Forecast Discussion
Issued by NWS Wakefield, VA

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FXUS61 KAKQ 191428

Area Forecast Discussion
National Weather Service Wakefield VA
1028 AM EDT Thu Apr 19 2018

A cold front will push off the coast this afternoon. Dry
weather with below normal temperatures will prevail Friday
through the weekend.


As of 1025 AM EDT Thursday...

Late this morning, sfc low pressure was just off the New Jersey
coast. A cold front extended fm the low SW acrs SE VA and NE NC.
A few light showers behind the front were moving thru the VA nrn
neck, middle peninsula, and into the Lower MD and VA ern shore.
The cold front will push off the coast this aftn, and despite
meager moisture fields, there is sufficient forcing associated
with a potent mid-level shortwave trough for iso-sct shras over
the NE counties thru this aftn. Otherwise, decreasing clouds
this aftn with dewpoints dropping quickly behind the front. The
low RH and WNW winds gusting up to 25-35 mph will lead to
increased fire danger this aftn (see fire wx section below for
more info). High temps will range fm the upper 50s to lower 60s
far N, to the lower 70s extrm SE VA and NE NC.

Winds slowly decrease tonight, under a mostly clear sky. Should
be too dry for frost, but temps are expected to bottom out
near 32F over portions of the Piedmont where a Freeze Watch has
been issued. Low temps in the mid/upr 30s elsewhere.


As of 400 AM EDT Thursday...

Dry/cool wx Fri as lo pres is slow to exit New England and hi
pres only gradually builds into the local area from the NW.
Still hanging on to a gusty NW wind near the coast. Mostly
sunny w/ highs mainly 55-60F.

Dry/cool wx continues Fri night-Sat as sfc hi pres arrives from
the NW. Winds to decouple/become light most places Thu night
resulting in another night w/ lows in the mid 30s inland
to around 40F near coast in ern/SE VA-NE NC. Mostly sunny Sat
w/ N winds aob 10 mph and highs from the u50s E to the l-m60s
along-W of I 95.


As of 420 PM EDT Wednesday...

Below average temperatures expected through the bulk of the extended
period as surface high pressure slowly moves from the wrn Great
Lakes to New England from Sunday through Tuesday. At the same time,
a low pressure system slowly tracks from the srn Plains to the
southeastern US. Rain chances return early next week as that same
area of low pressure tracks northeastward up the Atlantic coast.
Some track/timing differences exist between the 18/12z suite of
guidance. GFS brings in the rain late in the day on Monday while the
ECMWF holds it off until Tuesday PM and has much less QPF than the
GFS. CMC keeps all of the precipitation south of the CWA. Given the
uncertainty, kept PoPs around 40% for the bulk of the CWA from Tue-

Highs in the mid-upper 60s Sun-Wed from Central VA to NE NC.
Slightly cooler on the Ern Shore with low 60s Sun-Tue warming to mid
60s by Wednesday. Lows mainly in the 40s throughout the CWA on
Mon/Tue rising to around 50 Wed AM with the clouds/possible


As of 630 AM EDT Thursday...

Mainly VFR through the 12Z TAF period. Included some MVFR cigs
solely at KSBY where an increase in low-level moisture is
expected this morning. A cold front will then move through the
area during the day and bring mid level clouds and gusty W-NW
winds. Expect sustained winds of ~20 kt with gusts up to 30-35
kt from late morning through afternoon. Kept most TAFs dry for
now, with the exception of KSBY (VCSH) where the chances are

Outlook: VFR conditions continue through Sat. Winds will
diminish and shift to the NW tonight. VFR/dry with ~10 kt winds
from the NW on Fri, shifting to the N to NE on Sat.


As of 400 AM EDT Thursday...

Low pressure is pushing across the coast early this morning
with a cold front trailing back to the SW of the low. Low pressure
will push off the Delmarva coast by 12z, with the cold front pushing
across the coast later this morning. A SW wind is generally 10-15kt
ahead of the low. The wind will become NW aob 15kt as the low pushes
offshore, and then become WNW 15-25kt later this morning into the
aftn as CAA develops in the wake of the cold front. The wind will
become NW 15-25kt tonight, with gusts up to 30kt for the Bay/ocean.
Seas will initially be ~3ft early this morning, then build to 4-6ft
later this aftn into tonight. Waves in the Bay will be ~2ft, the
increase to 3-4ft later this aftn into tonight. Current SCA flags
will remain as is, but there will be a few hours of sub-SCA
conditions early today before CAA develops. High pressure builds in
from the NW Friday into Friday night. A secondary surge is expected
Friday night, but this surge should generally be sub-SCA. High
pressure will build over the region Saturday and Sunday resulting in
benign marine conditions. High pressure pushes off the Srn New
England coast early next week as low pressure pushes off the
Southeast coast. This will result in increasing onshore flow.


As of 1025 AM EDT Thursday...

WNW winds will gust to 25-35 mph this aftn into early this
evening behind a cold front. This pattern looks favorable given
the time of year, due to typical lag in the arrival of cold air
to the sfc as the downslope offsets the drop in 850 mb
temperatures for increased fire concerns. After coordination
with the VA fire service, have an Increased Fire Danger
Statement (SPS) for this aftn/early this evening over central
and eastern VA, as WNW winds become gusty to 25-35 mph and most
RH values fall to 25-30%. Also, have an SPS for Increased Fire
Danger for all of NE NC except the NC Outer Banks, and for the
VA ern shore and VA Beach.


VA...Freeze Watch from late tonight through Friday morning for
MARINE...Small Craft Advisory until 10 AM EDT Friday for ANZ630>634-650-
     Small Craft Advisory until 10 AM EDT Friday for ANZ656-658.
     Small Craft Advisory until 7 AM EDT Friday for ANZ635>638.


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