Listen to article \u2022\u00a00:00 min<\/p>\n
In advance of the chilliest air mass of the season, potent thunderstorms are possible late Friday afternoon into the evening, and then major changes are in the winds.<\/p>\n
The federal Storm Prediction Center has issued a severe-thunderstorm watch <\/a>for the entire region until 8 p.m., warning that gusts approaching 60 mph are possible. <\/p>\n In addition, \u201cWe can\u2019t rule out a stray tornado,\u201d said Joe DeSilva, meteorologist in the National Weather Service\u2019s Mount Holly office. <\/p>\n And then expect about 100% chance of October, with frost looking likely Sunday morning.<\/p>\n Said DeSilva, \u201cFinally, some real fall weather.\u201d<\/p>\n When severe storms might arrive in Philly<\/p>\n The prime time for any severe storms would be between 5 and 7 p.m., said DeSilva.<\/p>\n Temperatures climbed well into the 70s Friday afternoon as the sun made a reappearance, but the retro-summer is about to end. <\/p>\n Frost is likely in the region Sunday morning<\/p>\n After the rain shuts off Friday night with the passage of a powerful front, temperatures are due to tumble into the 40s, and on Saturday may get stuck in the low 50s, or about 30 degrees cooler than the highs on Friday.<\/p>\n For the thousands participating in the annual Philly Bike Ride<\/a>, the trip to the hills of Manayunk<\/a> might be a challenge: Winds from the north are forecast to gust past 35 mph throughout the event. <\/p>\n Winds back off and temperatures drop Saturday night. Early Sunday they could drop into the low and mid-30s, said DeSilva. <\/p>\n If skies remain clear and winds are light enough to allow the daytime heat to escape, patchy frost is likely to coat the car roofs and ground foliage in the region.<\/p>\n A \u201cfreeze watch\u201d for subfreezing readings has been posted for northern and western sections of Bucks, Chester, and Montgomery Counties.<\/p>\n Highs Sunday are forecast to be in the mid- to upper 50s, which would be about 10 degrees below normal.<\/p>\n Temperatures during the workweek could get no higher than the mid 60s, with nights in the 40.<\/p>\n And it should be looking more like fall. <\/p>\n The Philly region\u2019s peak foliage-color period is a bit away, based on the behavior of recent seasons, but the show should be getting a boost, <\/p>\n