Yesterday was very active.

Yesterday and last night was very active. This was the result of a series of disturbances rotating around that heat dome anchored over the Central Mississippi Valley. There was an earlier round of showers and thunderstorms. These produced a lot of rain. Several inches of rain fell, with storms producing 1-2 inches of rain per hour. Then another stronger disturbance moved across New York State and Pennsylvania. This allowed things to reorganize During the evening a line of severe thunderstorms swept through western-central New York State and north-central Pennsylvania. The line produced widespread damaging wind and frequent in cases near continuous lightning, over 48,000 lightning strikes were observed. As the line pushed through many tornado warnings occurred, there was at least one confirmed tornado, and the NWS survey teams are looking at other areas.  There was a lot of flash flooding due to the training nature of the thunderstorms (storm cells repeatedly tracking over the same areas).   

 Surface Chart and Radar

 

 

We can see the cold front is prepared to drop into New York State. This will become semi stationary, with disturbances moving along it, bringing rounds of rain showers and thunderstorms. We can see the disturbance over the Upper Midwest and Upper Great Lakes; this will roll through later today into the evening. Some of these will be strong to severe

Today

The NWS Storm Prediction Center has western Pennsylvania under an Enhanced Risk, with central/southern Pennsylvania, Maryland, Delaware, into New Jersey at a Slight Risk for the possibility of isolated severe thunderstorms. Strong, damaging wind gusts (Wind could gust above 70 mph) and heavy rain will be the primary hazard within these storms, though isolated hail, frequent lightning and a few tornadoes are also possible. With the heavy downpours localized flash and urban flooding is very possible.

Behind yesterday’s storms, the air is very humid, along to seasonal temperatures across New York State and New England. Across Pennsylvania and the Middle Atlantic, the air feels tropical with higher temperatures and humidity.  The tropical air will sag south as the cold front continues to slowly move south.

Stay weather aware, have a way to receive warnings. 

Rest of the Week

Storm chance continues tomorrow, this will be especially true over southwestern Pennsylvania, northern Maryland and southern Delaware. Where the NWS has a Marginal Risk for severe storms. Far southern Maryland and Delaware and points South will be highlighted in a Slight Risk.  The good news is much of this unsettled pattern ends in time for Labor Day weekend. Saturday and continuing into Labor Day Monday, temperatures and humidity levels look to be seasonal, with plenty of dry time. But those troughs will be close by, so a few isolated showers can’t be ruled out.  Tuesday will see a warm front lift into the region allowing temperatures and humidity to start to climb.  The next chance for rain appears on Wednesday, as a cold front approaches and move in over the region.