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Upstate/Eastern New York


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Temperatures are forecast to be near normal through the end of the month, then even a bit below normal for the first part of August. Precipitation is expected to be at or just below normal during the same period, which is some good news after all of the rain our area has received during the month of July up to this point.

weatherstory (17).gif

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Rain chances ramp up this weekend..

Saturday late afternoon and night a warm front will extend into our
region. This front will bring a warmer, more unstable atmosphere and
also increase humidity. Ahead of this front, and on the nose of a
shallow 40 knot LLJ, showers and thunderstorms will form across our
region through the night. As the moisture deepens the chances for
localized heavier rainfall is possible. Mild air will also be around
Saturday Night with lows warmer than the previous night.

A very humid airmass will start the day Sunday for our region. A few
showers will be possible through the morning hours...and this
activity will blossom during the afternoon and evening hours as a
cold front bears down upon the region. The cold front will begin to
pass through our region Sunday night, with shower and thunderstorms
diminishing in coverage area. Some patches of fog are possible over
the wet ground Sunday Night.

qpf_acc.us_ne - 2021-07-22T165338.730.png

qpf_acc.us_ne - 2021-07-22T165349.330.png

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A convectively augmented mid level shortwave will move from the
western Great Lakes Saturday morning to the eastern Great Lakes by
Saturday night, with an associated surface warm front and dewpoint
boundary reaching Western NY later Saturday afternoon, then the
eastern Lake Ontario region Saturday evening. Moisture transport and
convergence will be enhanced across the eastern Great Lakes by a
belt of 30-40 knot low level flow, and PWAT values will rise to
around 1.5".

Saturday will start dry, then a chance of showers and possibly a few
thunderstorms will arrive in Western NY during the afternoon. The
best forcing and moisture cross the eastern Great Lakes Saturday
night, when the most widespread coverage of showers and
thunderstorms is expected. PWAT values rising to around 1.5" and
ample moisture transport will support heavy downpours with some of
the storms. Forecast soundings are not supportive of much severe
weather risk, with poor mid level lapse rates resulting in skinny
and small CAPE profiles.

Most of the showers and storms will exit from west to east late
Saturday night and early Sunday morning as the mid level trough, low
level jet, and axis of deep moisture move into eastern NY and New
England. Drier and capped mid level air will move into the eastern
Great Lakes by afternoon, and stable lake shadows will also expand
northeast of Lakes Erie and Ontario. This will keep the bulk of the
area dry for the rest of Sunday once any early morning showers exit.
The one exception will be across the higher terrain of the Southern
Tier and Finger Lakes where some re-development of convection may
occur during the afternoon and early evening. Any diurnal convection
across these inland areas will end Sunday evening, leaving the rest
of Sunday night dry areawide.

d13_fill (7).gif

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Regional radar shows showers approaching from the west this
afternoon. Clouds will continue to increase across the region with
scattered light showers moving into far western NY this
afternoon. Dry conditions will continue east of the Genesee
River today. Warmer and more humid today as moisture continues
to increase ahead of the next system.

A warm front extends across the long axis of Lake Huron down to
western Lake Erie this afternoon. There is a sharp moisture gradient
across the region with PWATS less than an inch across most of
western and north central NY to close to 2 inches just to the west
of Buffalo. The area of showers and moisture will track east into
western NY through early evening and through late evening across
north central NY. The warm front will move east of north central NY
tonight while southwest winds increase across the region. Additional
moisture will advect into the region ahead of an approaching cold
front and shortwave trough. A line of showers with embedded
thunderstorms will form west of the region today and track across
western and north central NY tonight. Elevated instability will
increase but remain weak tonight. The best chance for thunderstorms
will be with the organized line of convection between 12am-8am
tonight. This line have forward progression however high moisture
content will result in heavy downpours especially with
thunderstorms. Widespread basin average amounts of 0.5-1.0 are
expected with localized higher amounts in storms. CAM guidance
suggest east of Lake Erie and southwest of Lake Ontario as the areas
to see the higher amounts of close to an inch of rainfall through
Sunday morning. Warm tonight with lows in the upper 60s to low 70s.

A cold front will move through the region Sunday morning. While a
lot of mid-level dry air moves into the region, greatly reducing
PWATS, surface dewpoints linger through the afternoon. With surface
temperatures rising into the low to mid 80s, isolated showers are
possible mainly across interior locations and along lake breezes in
the afternoon.
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Little cool down coming which the GFS predicted like a week ago..

With a decent amount of clouds around, especially Tuesday and
Thursday high temperatures will be near or just below normal...while
overnight lows dip to near normal levels.

&&

.LONG TERM /THURSDAY NIGHT THROUGH SUNDAY/...

A cooler and drier airmass is then forecast to build into the
eastern Great Lakes by Friday behind the departing cold front, with
temperatures trending about 5 degrees below average.

610temp.new (23).gif

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A pattern representative of a much "cooler" season will then take
shape toward the close of the weekend into the start of next week.
Strengthening of the western ridge centered over the Rockies will
take place, amplifying the ridge well into northern Canada.
Meanwhile, the impact downstream will be a large sharpening trough
over the east that will possibly dig well into the southeastern
states. In the center of this large trough will be a deep closed
upper low that is forecast to drop into Hudson/James Bays and
linger...ringing any bells yet? In layman`s terms, if I had no clue
what the current month is, just looking at the upper level pattern
would think it was early-mid winter with a potential blockbuster
lake effect event on the way (one can dream, right?). However, in
reality being that it`s the start of August, this will translate to
a strong cold front crossing the region at some point with the
likelihood for showers and thunderstorms. This will be followed by
yet another push of some unseasonably chilly air in its` wake. Still
a week away, so things like timing/positioning/etc can and likely
will change some, but something to watch. Highs Sunday will
generally be in the low to mid 70s ahead of the cold front, before
the next push of cooler air moves in.
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7 minutes ago, wolfie09 said:
A pattern representative of a much "cooler" season will then take
shape toward the close of the weekend into the start of next week.
Strengthening of the western ridge centered over the Rockies will
take place, amplifying the ridge well into northern Canada.
Meanwhile, the impact downstream will be a large sharpening trough
over the east that will possibly dig well into the southeastern
states. In the center of this large trough will be a deep closed
upper low that is forecast to drop into Hudson/James Bays and
linger...ringing any bells yet? In layman`s terms, if I had no clue
what the current month is, just looking at the upper level pattern
would think it was early-mid winter with a potential blockbuster
lake effect event on the way (one can dream, right?). However, in
reality being that it`s the start of August, this will translate to
a strong cold front crossing the region at some point with the
likelihood for showers and thunderstorms. This will be followed by
yet another push of some unseasonably chilly air in its` wake. Still
a week away, so things like timing/positioning/etc can and likely
will change some, but something to watch. Highs Sunday will
generally be in the low to mid 70s ahead of the cold front, before
the next push of cooler air moves in.

4 months too soon. 

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