Area Forecast Discussion
Issued by NWS Blacksburg, VA

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
FXUS61 KRNK 290807

Area Forecast Discussion
National Weather Service Blacksburg VA
407 AM EDT Mon May 29 2017

Warm front lifts north to the mid-Atlantic this evening, with a
cold front to follow across our area Monday. This front slows
and stalls from the Tidewater of Virginia to the Smokys
Tuesday, while a stronger cold front moves in helping to push
the deeper moisture out midweek.


As of 300 AM EDT Monday...

Upper low moves east across the Great Lakes today and tonight with
little change in 500MB heights over the Mid Atlantic region. 500MB
temperatures drop today which should eliminate the mid level cap.

Surface low off the southeast Virginia coast will move northeast
today. This will push the warm front out of the Virginia piedmont
with winds coming around to the west. Low clouds and fog over
Lynchburg and to the north and east will move out as the front

The west surface through 850MB wind will keep low level and moisture
against the west slopes of the Appalachians. By afternoon winds back
enough to the southwest to bring deeper moisture into the foothills
and piedmont of North Carolina and southern Virgina. Models now
bringing the boundary through the region this morning. A wave
of low pressure tracking along the front will slow down its
southward progress tonight. Will have highest probability of
precipitation in northern North Carolina this afternoon, but
GFS, RAP and NAM all showing differences in location of the
northern edge of the deeper moisture.


As of 250 AM EDT monday...

A broad area of low pressure will cover southern Canada south into
the southern plains to the Carolinas Tuesday. This upper level
trough will push a surface trough over the area Tuesday afternoon
and evening. This trough with lowering heights will be enough to
generate thunderstorms in the afternoon with a few becoming strong.
Majority of the stronger convection should stay south across the
Carolinas where a mid level disturbance is forecast to track.
Tuesday night this surface trough will slide south with little to no
overnight convection. The passing of the surface trough Tuesday will
mainly bring a wind shift. Outside of a shower, temperatures should
warm into the upper 70s to mid 80s.

A weak cold front will bring another day of scattered convection to
the area Wednesday. This front will have better jet dynamics than
Tuesday`s trough. However, low level winds will primarily be out of
the west and possibly strong enough to disrupt organized convection
in the afternoon. Still can not rule out some strong to severe
thunderstorms during the late afternoon and into the evening.
Depending on the timing of the front and associated showers,
temperatures will range in the 70s west of the Blue Ridge and low to
mid 80s east.

The upper level trough will begin to lose its influence on the
region Thursday. Surface high pressure and zonal flow will keep the
region dry. Temperatures will warm to near normal with mid 70s west
and lower 80s east.


As of 1111 AM EDT Sunday...

Heavily used a blend of guidance for this forecast period. Clearing
of the front Wednesday night with increasing subsidence follows for
overnight into Thursday. Thursday appears to be the next day with
fully dry and mostly sunny conditions for the forecast area along
with seasonable temperatures. Unfortunately, it appears that is
short-lived, as a trough digs into the southwestern CONUS and sends
weak vorticity maxima pivoting eastward across the central Plains,
Ohio/TN valleys and into the Appalachians. Difficult to time any
specific disturbances at this range but it does appear we return to
a more unsettled weather pattern for late week into the weekend.
Temperatures start out near normal, then begin to trend near to
slightly above along with rising dewpoints heading into the


As of 1100 PM EDT Sunday...

Through daybreak...IFR/LIFR stratus and Fog will be found from
KLYH northward into northern VA...the result of cool stable air
on the north side of a stalled frontal boundary. South and west
of the front, (from RLX-BLF-ROA-DAN and areas to the southwest)
conditions were mainly VFR...although do anticipate some patchy
ground fog for these locations too.

A surface front extends from the Ohio Valley southwest into the
lower MS Valley. This front will move east and over the
Appalachian mountains Monday, winds becoming west-northwest.
Frontal convergence will result in enough lift for afternoon
buildups and the development of showers/storms along the front
Monday afternoon, mainly from the VA/NC piedmonts to the coast.

Extended Aviation Discussion...

Mainly VFR through the week except for early morning river
valley fog. There is the potential for scattered afternoon and
evening storms Wednesday, Friday and the weekend. Tuesday and
Thursday are expected to be dry.




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