After a brilliant weekend of sunshine and mild temperatures, the upcoming week will be less ideal. A slow moving pattern has setup across the country and Atlantic thanks in part to a large storm system near the Azores Islands. This blocking pattern is yielding a slow-moving pattern upstream to the west through the rest of the Atlantic and across eastern North America. Unfortunately, when a storm system moves in, this pattern means things will linger around for a while and lead to an unsettled stretch of weather for the first part of the week.
Showers and drizzle will be with us for Monday and Tuesday as a weak disturbance tracks to our south. This weak low, in tandem with high pressure over Nova Scotia, will push east breezes into the region and bring us cooler weather to start the work week. Those showers will gradually nudge to the south as high pressure tries to build in for Wednesday and Thursday. However, with a bit of an east wind around we’ll continue to deal with the prospect of clouds at times and temperatures that will be cooler at the Shore than they will be around here.
As we work towards and through the weekend, a storm system that works through the Midwest will gradually work to the East Coast. This storm system will cut off from the main jet stream over Canada and move through the Ohio Valley and to the East Coast very slowly. We could see a rainy and damp stretch set up at some point in the weekend into early next week, with this stretch of time potentially more significant in terms of rainfall compared to what we get the next couple of days.
Temperatures will be cool to start this week – highs around 60 on Monday and Tuesday afternoon. We should be a bit milder for Wednesday, Thursday, and perhaps into Friday. However, next weekend’s prospect for rain may yield cooler temperatures once again. This weekend’s forecast…and the potential impact on the Broad Street Run…is still very much in the air due to the very slow moving nature of this storm system and its uncertain track according to computer modeling.
-------------------------------------------------------------------------------
Tom Thunstrom is the editor and publisher of Phillyweather.net. You can also follow Phillyweather.net on twitter @phillywx or on Facebook.