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Upstate/Eastern New York


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Still looks like a mild day is on tap for Wednesday. However, a weak
wave of low pressure passing to the north now looks like it will
nudge the cold frontal boundary southward across the eastern Great
Lakes. This would result in cooler MaxT`s depending on how far south
the front makes it. Have kept with the previous forecast with low to
mid 70s.

Wednesday night through Friday, lots of uncertainty during this time
period. ECMWF sends the cold front through the Lower Lakes during
the Wednesday night time frame with a brief period of dry
conditions. However, right on its heels low pressure over the Mid-
Mississippi Valley quickly races NE with wet weather returning for
Thursday and then possibly turning sharply colder for Friday. Maybe
even some snow showers? On the flip side, the GFS stalls the
boundary over the region with much milder yet unsettled as several
waves ride along this boundary through Friday. Low confidence
forecast at this point and have made only minor adjustments for
now to MaxT`s and POPs.

sn10_acc.us_ne - 2021-04-24T093649.205.png

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11 minutes ago, wolfie09 said:

Still looks like a mild day is on tap for Wednesday. However, a weak
wave of low pressure passing to the north now looks like it will
nudge the cold frontal boundary southward across the eastern Great
Lakes. This would result in cooler MaxT`s depending on how far south
the front makes it. Have kept with the previous forecast with low to
mid 70s.

Wednesday night through Friday, lots of uncertainty during this time
period. ECMWF sends the cold front through the Lower Lakes during
the Wednesday night time frame with a brief period of dry
conditions. However, right on its heels low pressure over the Mid-
Mississippi Valley quickly races NE with wet weather returning for
Thursday and then possibly turning sharply colder for Friday. Maybe
even some snow showers? On the flip side, the GFS stalls the
boundary over the region with much milder yet unsettled as several
waves ride along this boundary through Friday. Low confidence
forecast at this point and have made only minor adjustments for
now to MaxT`s and POPs.

sn10_acc.us_ne - 2021-04-24T093649.205.png

One more?

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17 minutes ago, wolfie09 said:

Another chilly day on tap, made it down to 33° with a forecast high of 44°..

Tues-thurs is now forecasted upper 50s-mid 60s...

We still have mid 60s to mid 70s (Wed) in forecast. Hope it holds. Golf league starts wednesday. Could be rare good timing for starting so early.

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Some much needed rain..

Broad upper level ridge shifts from the central CONUS to the Great
Lakes and Northeast. Jet energy and shortwaves will lift along the
edge of the ridge to support bouts of lift and increased deeper
moisture which will ultimately focus better chances of rain. At
the sfc, low pressure from central plains will expand over the
western Great Lakes Tuesday into Wednesday while a warm front lifts
across the Great Lakes and eventually over the Northeast CONUS
Tuesday night into Wednesday.

Warm front slower to lift through on Tuesday so lowered temps from
Genesee valley to east of Lake Ontario with now low to mid 60s at
best with plenty of cloud cover. Temps could still reach lower and
maybe mid 70s over especially southwest NYS where clouds clear
earlier in the day and sfc warm front begins to move through.
Overall idea of forecast Tuesday into Tuesday night stayed same
though with warm, moist advection aloft to north of sfc warm front
supporting small chances for showers mainly over North Country on
Tuesday into Tuesday night. Hint of a couple shortwaves moving
through as well along edge of warmer air aloft will modulate
coverage and intensity of showers. Seems elevated CAPE is too far
southwest to include thunder through Tuesday night, so have left any
mention out for now. Sfc warm front makes it through area on Tuesday
night so still looks like warm night with lows only in the 50s and
maybe staying near 60 along Lake Erie shore.

On Wednesday, sfc-H85 warm front and associated shortwaves running
along edge of ridge aloft will result in greatest focus for showers
through early afternoon along and north of Lake Ontario, but also
including the North Country and St. Lawrence River Valley. Kept pops
high all day in these areas. Otherwise, with sfc low still west over
central Great Lakes, expect minimum in shower coverage elsewhere
through midday. By early afternoon though with shortwave hinted at
moving into western NY and temps across most areas south of Lake
Ontario warming well into the 70s and dewpoints climbing well into
the 50s, will see some build up of sfc based instability, perhaps up
to 500 j/kg of MUCAPE. Moisture may be lacking though in the warm
sector, so away from the warm front boundary, kept pops only in the
chance range for some showers and possible thunderstorms.

On Wednesday night, seems there may be a lull in showers and
possible thunderstorms as lead shortwave shifts toward New England
and we await developing upper level trough and resulting downstream
warm, moist advection over the Ohio Valley. Cannot rule out a
shower, but chances will probably be lower until later at night over
southwest NYS. Lows again in the 50s.

&&

.LONG TERM /THURSDAY THROUGH SUNDAY/...
Approaching upper level trough and increasing upper level jet and
sfc warm front lifting toward region from another wave of sfc low
pressure are pointing toward a wet day with widespread showers and
maybe a rumble of thunder with some elevated instability shown
closer toward sfc warm front. Also looks like the wave of low
pressure will lift across our region through the day, heading
toward New England Thursday night while deepening. Overall, pops
will stay higher over eastern areas Thursday night while
trending down over western NY.

By Friday, sfc low will continue to deepen over Canadian
Maritimes while ridge will be building northern Ontario to
western Great Lakes. A cooler blustery day is in store with some
scattered showers. Wind gusts of 30-40 mph look possible. Highs
on Friday only in the lower to middle 50s. Cold air advection
Friday night into Saturday (H85 temps lowering to -5c) will
result in some snow mixing with the rain over higher terrain,
especially east of Lake Ontario where better moisture will be
located closer to upper level trough and sfc low.

qpf_acc.us_ne - 2021-04-26T124017.998.png

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Kbuf morning discussion..

Quote

Summerlike pattern in terms of chances for showers and thunderstorms
next couple days. The significant widespread warmup that looked to
occur is not as likely, though good part of the area south of Lake
Ontario to the NY/PA line today and Wed will still see temps in the
70s.

Upper air pattern features broad trough over western CONUS with
large, flat ridge from central to eastern CONUS. Belt of stronger
westerlies runs from central Plains to western Great Lakes. At the
sfc, a warm front is lifting across southern portions of the western
Great Lakes while sfc high is centered over western Quebec. Ridge
aloft only slowly moves east through Wed morning before getting
flattened some as stronger shortwave trough crests it. Sfc warm
front gradually lifts over eastern Great Lakes into Wed, though due
to convection riding west to east to the north of the front and the
front encountering cooler lakes, expect the front to not completely
make it to the north of our forecast area. Instead expect it to
maybe make it to south shore of Lake Ontario before dropping back
across the rest of the area late Wed.

Now to the details. Batch of showers more tied to the H85 warm front
continues to exit eastern Lake Ontario region this morning. Thus
far, most locations impacted by the rain have measured a few
hundredths of rain. Looks like sfc temps have probably warmed enough
enough east of Lake Ontario to limit potential for any freezing
rain. Otherwise, area of showers with stronger embedded wave aloft
sliding across Georgian Bay and north of Lake Ontario should reach
eastern Lake Ontario region rest of this morning into early
afternoon. Could also be a few showers later today as far south as
south shore of Lake Ontario just ahead of arriving sfc warm front.
Highs today will show a range across that front, with upper 50s/60F
North Country to mid 70s near NY/PA state line.

Tonight, appears embedded shortwave will emerge out of convection
currently over Upper Mississippi valley and western Great Lakes
on edge of greater MUCAPE and just to north of sfc warm front.
Main focus for this wave and higher pops will be over North
Country, along H85 temp gradient and north of sfc warm front.
Increased pops to likely for those areas. At this time, appears
better elevated instability feeding the convection this morning
over western Great Lakes fades before making it into our area,
so have not included thunder tonight. Lows still showing the
range across the sfc warm front, with 40s North Country to
55-60F western NY.

On Wednesday, a lot of moving parts are at play for the forecast.
Decent signal that sfc warm front stays nearly stationary across our
region as northerly winds that are reinforced from showers tonight
across northern Lake Ontario to the North Country keep front from
moving north of the south shore of Lake Ontario. In fact, could be
some marine/advection type fog that could impact south shore of Lake
Ontario through the day. Even to the south of warm front there are
indications intervals of low-mid clouds may cut down on potential
warming. Similar to Lake Ontario, rain showers moving into western
NY through the morning and higher dewpoints into the 50s flowing
atop the cooler waters of Lake Erie may lead to fog or at least
stratus closer to Lake Erie. Based on this, tempered warming
along Lake Erie and Lake Ontario. Areas near NY/PA line to
western Finger Lakes seem to be in line with best chance of
seeing afternoon temps well into the 70s, with a lower 80F
degree not out of question as long as clouds are not a factor.

Showers in the morning will be due to stronger wave sliding from
Upper Great Lakes toward southern Ontario and eventually southern
Quebec in the aftn. Once again highest pops with this wave will be
over North Country as it has looked for a while now. On the southern
edge of this better forcing where temps reach the 70s and dewpoints
surge into the 50s, MLCAPE may reach 750-1000J/kg and there is ample
shear over 40 kts to support stronger updrafts and some risk of a
severe storm. H7 winds due west at 40-50 kts, so main area of
concern would be NY/PA border to western Finger Lakes and not much
farther north than that. However, if the warm front ends up farther
north, all these expectations would have to be shifted north as
well. Also see that high-res guidance is not as restricted in
location as this forecast with stronger thunderstorm potential
even closer to Lake Ontario and as far north as St. Lawrence
river valley. SPC has introduced marginal risk for severe on
day2/Wed and that seems reasonable given the shear. Location
will be the main thing to fine tune. Forecast mentions slight
chances of thunder all areas and chance in the corridor where
temps will reach well into the 70s.

&&

.SHORT TERM /WEDNESDAY NIGHT THROUGH THURSDAY NIGHT/...
Wednesday night and Thursday, a brief lull in the showers is
expected late in the evening Wednesday into early Thursday morning
as the shortwave trough tracks east of the area. Additional showers
will fill in from the southwest Thursday morning as a plume of
moisture tracks northeast ahead of an approaching area of low
pressure. Showers, followed by the low pressure will generally track
across the region along a west to east oriented frontal boundary
that originally tracked over the region from the earlier shortwave
trough. Deviations north or south with this boundary will dictate
rain amounts, as well as temps for Thursday. As of now though, looks
like a soggy period for most areas across Western and North Central
NY. Some thunderstorms will be possible late Wednesday evening, and
then to a lesser extent on Thursday afternoon. Temperatures on
Wednesday night will be in the mid to upper 40s for the North
Country, where the above mentioned boundary is more likely to pass
over. Temperatures in the low to mid 50s south of Lake Ontario,
where timing certainty for the frontal passage is a bit less clear.
Highs on Thursday will be in the low to mid 60s from north to south
respectively. But again, depending on exact placement of the front,
temps may be a bit warmer or cooler.

Thursday night, showers will taper off from west to east toward
daybreak on Friday morning. Timing with the back edge of the main
area of showers is a bit unclear still as different guidance
solutions and track of the system dictate how quickly the area of
low pressure moves through. As the area of low pressure moves across
the region, a cold front will move across the region as well,
causing a cooling trend for the next few days. Temperatures on
Thursday night will be in the mid to upper 40s.

 

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