Area Forecast Discussion
Issued by NWS Buffalo, NY
FXUS61 KBUF 280221
Area Forecast Discussion
National Weather Service Buffalo NY
1021 PM EDT WED JUL 27 2016
A weak cold front will drop southward from Canada overnight
bringing a few stray showers and thunderstorms to the North
Country tonight and and across portions of Western New York and
the Finger Lakes region on Thursday. Chances of showers and
thunderstorms will continue into the weekend as a broad trough
temporarily settles across the Great Lakes and Northeast States.
.NEAR TERM /THROUGH THURSDAY/...
A weak cold front will gradually drop across Lake Ontario
overnight. Showers with this, and along an outflow boundary from
this have weakened considerably late this evening, with only
minimal chances though midnight and then largely a dry forecast
Clouds will gradually increase overnight, spreading from north to
south. This will still leave skies clear for most of the night
across the Southern Tier which will provide good radiational
cooling conditions. This should result in some valley fog forming
after midnight. Overnight low temperatures will settle to the
lower to mid 60s inland and across higher terrain, and to the mid
to upper 60s closer to the warm lakes and in urbanized areas.
The weak cold front will continue to move south across the region on
Thursday and should reach the Southern Finger Lakes and Southern
Tier counties by midday and the afternoon. A combination of the
front and lake breeze boundaries will provide a focus for some afternoon
convection with scattered showers and possibly a few thunderstorms.
The low chance for afternoon convection will also linger over the
Saint Lawrence Valley closer to the broad upper trough over
Quebec. High temperatures on Thursday will be in the lower to
middle 80s with some upper 80s across Central New York.
.SHORT TERM /THURSDAY NIGHT THROUGH SATURDAY NIGHT/...
There had been some hope that parts of our area would pick up some
beneficial showers and thunderstorms during this period...but the
trend of most of the guidance packages are suggesting that such
activity may not be as widespread as earlier anticipated. In fact...
a large portion of Western New York may not pick up measurable rain
through Saturday night...with an even greater chance for dry weather
found across the North Country. Looking at the details...
A weak cold front that will gradually push south across our region
on Thursday will settle across Pennsylvania where it will stall
Thursday night and Friday. While a wave moving east along the
stalled front will help to generate some showers and thunderstorms
over the Keystone state...the track of the wave is now expected to
be further to the south. General lift associated with the
disorganized sfc low will thus be further south as well...leaving
little forcing across our forecast area. Have thus backed off on the
pops a little for sites north of the Srn Tier. In fact...high
pressure based over the the Upper Great Lakes will press far enough
across Lake Ontario to promote some clearing from the north during
the course of Friday afternoon.
The sfc high will expand across all of the Great Lakes region Friday
night...and this will help to push the wavy frontal boundary even
further south across the Mid Atlantic region. Outside of a leftover
evening shower across the Southern Tier...this will leave an
uneventful night in place for our forecast area with at least
partial clearing continuing from north to south.
On Saturday...the high will make its way across New England with
generally fair weather holding in place across our region. The
exception could come across the Srn Tier where increased moisture
within the return flow around the exiting sfc high could support a
late day shower or day for sites well south of Buffalo.
.LONG TERM /SUNDAY THROUGH WEDNESDAY/...
A progressive...low amplitude trough over the Great Lakes at the
start of this period will push off to the East during the start of
the new work week. This will allow scattered showers and
thunderstorms at the end of the weekend to clear out...leaving
fine...mid summer weather across the region for the Monday through
Wednesday time frame.
Temperatures during this period will once again climb to levels that
will average some 5 to 8 deg f above normal early Aug values.
.AVIATION /02Z THURSDAY THROUGH MONDAY/...
Expect mainly VFR conditions later overnight and Thursday. The
exception is at JHW where fog is likely to form after midnight,
resulting in variable vsby through daybreak. This should average
around 2SM, but could range wildly late tonight.
On Thursday a front will gradually drop south across the area, and
this combined with lake breeze boundaries may result in scattered
showers and possibly a thunderstorm Thursday afternoon. Coverage
should be quite spotty, and largely avoiding TAF sites.
Thursday night...Mainly VFR with a chance of showers and
Friday through Sunday...VFR/MVFR with a chance of
showers and thunderstorms.
A weak cold front will gradually drop south across Lake Ontario
overnight. This will then be followed by another high pressure
area late in the week. Winds and waves are expected to remain
below small craft criteria into the beginning of the weekend.