Dyskusje naukowe prognostyków
fxus61 kokx 251949
Area forecast discussion
National Weather Service New York New York
349 PM EDT sun Jun 25 2017
a weak low pressure troughs will form over land Monday and move
offshore Monday night. A cold front crosses the region Tuesday
afternoon with high pressure building to the south of the region
for Wednesday. A warm front crosses the region late Thursday
followed by warm, humid and unsettled weather on Friday though
Near term /until 6 am Monday morning/...
a surface trough moves east this evening. Any shower activity
weakens and comes to an end, with dry conditions expected
overnight. Winds tonight will veer more towards the west or NW,
and remain fairly light.
Overnight lows fall into the 50s and 60s.
A moderate risk for rip current development remains at Suffolk
ocean beaches this evening.
Short term /6 am Monday morning through Monday night/...
another weak surface trough develops over the area Monday.
Aloft, heights fall to the west of the area as next shortwave
moves across the Great Lakes region.
Plenty of sunshine Monday morning, gives way to a some
afternoon clouds especially north and west of NYC. A few
isolated showers will again be possible across the interior.
Dry conditions are expected Monday night.
Temperatures on Monday will climb into the 70s and lower 80s.
Monday night, lows fall into the 50s and 60s.
Long term /Tuesday through Sunday/...
looks fairly dry with comfortable humidity and slightly below normal
temperatures through mid week. A warm front approaches on Thursday
as low pressure passes across southern Canada. In its wake, a cold
front sags south into New York state on Friday. The front becomes
stationary near the region into the weekend - which appears will be
Upper trough axis approaches Tuesday, passing Tuesday night. Perhaps
a tad more instability Tuesday and trof/pseudo cold frontal passage triggers a
showers and perhaps a ts (instability is limited with dry mid
Wednesday is dry and then warm advection starts in on Thursday.
Frontal boundary in the region, or just north, on Friday and have
pops in for thunderstorms and rain. Looks to remain unsettled through the Holiday
weekend at this time. Li's as low as -5 c with long narrow cape's
and pwat's over 2 inches in a unidirectional flow supports
potential for flash flooding - mainly in urban areas.
Temps come back to near seasonable on Thursday and then go above
Friday into the weekend. No heat issues foreseen though.
Aviation /19z Sunday through Friday/...
a weak low pressure trough will move through late this afternoon
into this evening. High pressure to the south will otherwise be in
Line of showers is now moving across southern CT, with an associated
gust front extending SW to the NYC metros as of 1945z and already
through kteb/kewr/klga. Gust front may get hung up over NYC and may
or may not make it to kjfk, hence tempo forecast for a wind shift.
Farther east the gust front is unimpeded, and kbdr/kisp can expect a
brief wind shift to northwest 10-15g20kt. Based on kteb obs the wind shift
should only last about 30-40 min at most, followed by another 30-40
min of variable winds less than 10 kt, then brief resumption of S-SW
winds 10 kt or less until about sunset.
SW winds should then diminish further this evening, then winds
become light west-northwest overnight, and SW close to 10 kt by Mon afternoon,
with coastal sea breeze development by 15z-16z.
Outlook for 18z Monday through Friday...
Monday afternoon ... VFR. Coastal sea breezes. Slight
chance of a late day shower/tstm northwest of NYC metros.
Tuesday...mainly VFR. Chance of a late day shower/tstm.
Thursday...mainly VFR. Chance of a late day shower/tstm mainly
north of the NYC metros and Long Island.
Friday...mainly VFR. Chance of a late day shower/tstm at kswf.
winds and seas will remain below small craft levels through
Monday night. Ocean seas will likely build to Small Craft Advisory criteria late
Thursday and continue as such into Friday.
no hydrologic impacts expected through Thursday. There is potential
for localized flash flooding associated with Summer convection
Friday through the weekend - mainly in urban areas. River flooding
is not anticipated.
astronomical tides are running high, especially during the
nighttime high tide cycles.
Main area to watch would be across the Nassau South Shore bays,
where water levels should briefly touch or barely exceed minor
thresholds this evening. The times of high tide are from 9-11pm.
observations from kfrg (farmingdale, ny) are not available.
Observations from khpn (white plains ny) and khvn (new Haven ct)
are being disseminated through backup methods. All is due to
an FAA communication line outage. Return to service time is
near term...British Columbia
short term...British Columbia