Monday, April 24, 2017, 10:42 PM EDT
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Area Forecast Discussion
Valid At
Wed, Dec 31, 7:00pm EST
FXUS61 KCTP 241910

Area Forecast Discussion
National Weather Service State College PA
310 PM EDT Mon Apr 24 2017

A storm system over the southeastern states will begin to make
slow progress northward along the coast over the next several 


Rain continues to advance from the south. Showers remain
scattered as lower atmosphere is fairly dry. Have tried to 
refine the timing and northward extent of the rain and opaque 
cloud cover for the near term. Overall, the timing is similar 
between all the guidance. QPF will be light today, on the order 
of a tenth of an inch or less south of I-80 and a tenth to 
quarter of an inch south of the turnpike. Maxes should be above 
normals in the north but below normal in the south. Temps
through southern and central PA are in low 60s where the mainly 
sunny Northern portion of PA has reached the 70s. 


The guidance is very consistent with timing and placement of the
major features. Deep easterly flow will slide up the coast into
PA through the short term period. Moisture will slowly
infiltrate the lower levels and rainfall will become more
widespread overnight into Tuesday morning. The confidence in 
occurrence of the decent rain is highest tomorrow afternoon, 
especially through the eastern half of the region. However, the 
tilt of the trough which the upper low is associated with is a 
little fuzzy. With a more- negative tilt it may move a little 
faster, and bands of rain may move more quickly. This would 
probably keep the rain lighter at any one location. Looking at 
latest plumes keep precip total/accumulation around 0.5 through 
the period. Most of this rain should be out of stable profiles, 
so thunder and big totals are not likely. Temps will be 
seasonably mild overnight tonight. Maxes on Tues will be 
homogeneous in the u50s to low 60s in the far northwest where 
skies will see some sun. 


The upper low is progged to take a right turn as or even before
it gets to our latitude. As it pulls away to the east, the
chance of rain drops off Tuesday night. It will get warm fast. 
It should feel like summer through the second half of the week.

As the 500 hPa low fills and the attendant low moves to our 
northeast the chance of rain should fall off Wednesday into 
Wednesday evening. Our 850 hPa temperatures will rise rapidly 
Wednesday and it should be noticeably warmer Wednesday relative 
to Monday and Tuesday.

Thursday into Saturday the 850 hPa temperatures will be well
above normal, mainly in the 14 to 16C range and we will be on
the western edge of a rather impressive early season subtropical

Thursday through at least Saturday should be very warm and 
humid. We should have several days with high temperatures around
80. Thursday into Friday will see the passage of large upper 
level trough. Have left broad POPS as this trough will move a 
corresponding front through.


High pressure and associated dry air mass over Pennsylvania will
keep widespread VFR conditions and light winds through the
afternoon over much of PA. Low pressure lifting up the east 
coast will spread lowering clouds and spotty light rain into 
southern Pa through late this afternoon. The dry air in the low
levels should keep conditions VFR. However, model soundings and
SREF prob charts suggest MVFR conditions will become likely by 
this evening across southern Pa, with IFR even possible at 
AOO/JST. Overnight tonight into tomorrow IFR and lower cigs are
possible encroaching from the south to the north beginning
around 06Z. Expect IFR possible at most TAF sites and possibly
continuing into tomorrow afternoon. 


Tue...Rain/low CIGs likely.

Wed...AM rain/low CIGs possible. 

Thu...AM fog possible. PM tsra impacts possible. 

Fri...PM tsra impacts possible.




NEAR TERM...Dangelo/Ceru
SHORT TERM...Dangelo
LONG TERM...Dangelo/Ceru

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