Severe Thunderstorm Watch Most of Eastern Pennsylvania & New Jersey Hudson Valley
Fast-moving/accelerating bands of showers/thunderstorms will continue to move northeastward across the region this evening. Winds through a deep layer are very strong and, in spite of weak instability, will be conducive to strong/near-severe wind gusts capable of damage. A brief tornado cannot be entirely ruled out
We have another Severe Thunderstorm Watch that had been posted for Northeast Pennsylvania (including Pike County) and for Sullivan, Ulster, and Dutchess County northward in the Hudson Valley. This is ahead of a strong cold front now moving through Western Pennsylvania. Radars are loaded to the west and we will see heavy downpours and some severe weather later this evening. The watch is in effect until 2am Friday.
Regional radar is busy across Pennsylvania with downpours moving northeast and most of those pass north and west of Philadelphia and NYC though the eastern flank could catch a few spots this evening. Local radars are also picking up on some clusters of showers. We will watch the regional radar load up this evening as thunderstorms move into Pennsylvania and strengthen.
LOCAL RADAR NEW YORK CITY
The main frontal action with thunderstorms will be from 10-11pm in Eastern Pennsylvania and Western NJ. Those showers and thunderstorms should reach the Hudson Valley east of the Hudson River, NYC and the Jersey shore around midnight and over Long Island and Connecticut shortly afterward. As the front passes given the sharp nature of it, winds will pick up considerably this evening and become strong and gusty. Some gusts to 50 mph are possible especially along the coast as the front passes.
We have the HRRR model above which starts at 5pm and ends at 6am Friday. We have problems with all the models in terms of how they represent the front and the radar presentation. They seem underdone compared to what we are actually seeing on the radars at the moment. I don’t have problem with the timing issue. The front moves through fast and note the sharp V shaped front that move though indicating a rather turbulent atmosphere with a sharp windshift from southwest to northwest as the front goes by. Bursts of wind are likely here when the front passes regardless of whether the storms hold together or not.
We also have the HRRR wind forecast. These show sustained winds and we can see the fast development of gales this evening. The first frame is at 10pm Thursday and the last is 4am Friday. This would certainly support gusts of 40 to 50 mph with that sharp V structured front moves on through. Weather conditions improve on Friday with sunshine returning with a gusty wind and temperatures in the 50s. The weekend looks dry and chilly with some sun and clouds both Saturday and Sunday with daytime highs in the low to mid 50s. Nighttime lows will be in the 30s with 20s in cold spots and near 40 in some warmer urban areas.
WEATHER IN 5 VIDEO 2PM THURSDAY
MANY THANKS TO TROPICAL TIDBITS FOR THE USE OF MAPS
Please note that with regards to any severe weather, tropical storms, or hurricanes, should a storm be threatening, please consult your local National Weather Service office or your local government officials about what action you should be taking to protect life and property.