A deep trough has taken over the eastern US over the past few days, and a strong Canadian high pressure has set shop over the Plains which is leading to a NW flow injecting a continuous strong polar air mass into the region with temperatures between 8-12 degrees below average , the same general theme will remain in place through Monday with highs in the upper 40s to mid 50s area wide, lows generally in the mid to upper 20s interior, upper 30s to around 40 in urban areas and along the coast, lower to mid 30s in between. Tomorrow night will be a tad warmer due to a weak cold front and increased clouds but not by much
The growing season has officially ended for much of the interior areas, like NE PA, Northern and Central NJ and some portions of SE PA points west therefore, freeze/frost watches are only in effect for coastal areas for early tomorrow morning
Areas of western Union county and western Essex have seen frosts and freezes over the past 2 nights as well and the growing season should have ended so not sure why advisories are posted there but anyway, areas in blue are areas where the growing season will likely end tonight which is actually a little ahead of schedule for coastal areas, while interior areas were a little behind schedule.
Monday through much of next week will moderate towards more average temperatures as we see a storm develop out in the Plains and influence our weather, much of the week will be in the lower to mid 50s interior, upper 50s to low 60s elsewhere with lows in the mid 30s to low 40s , the best chance of above average warmth will come Thursday and Friday as a strong cold front comes east and southerly winds develop ahead of it with potential for all locations to spike up into at least the 60s for highs
There will be a chance of isolated showers later on Weds and Thursday with a weak warm front but with dry air in place most locations should be dry, this includes Halloween which should be mostly dry , some increasing clouds with highs in the upper 50s to mid 60s and lows in the upper 30s to mid 40s
The more significant rain should hold off until sometime between Friday afternoon and Saturday as a strong low pressure tracks towards the Great Lakes, bringing heavier rains and wind to the area, there’s a lot of timing issues with this as the GFS has it impacting on Halloween while the Euro has it on Friday and Saturday, given the strong high pressure that will be in place over the eastern US a later solution is likely
After this cold front pases through we will likely return to a similar pattern we are now with the MJO locked in phases 8-1 and we should see a ridge re-emerge in the east Pacific and western US pretty easily as a trough establishes itself once again near the Aleutians which would bring in a trough and chilly weather to the east by November 3-4th or so after this brief break in the pattern.