ChescoWx

Today we should see highs from low 60's in ridge locations to the mid 60's in valley spots. Temperatures will fall from the low 50's at midnight to lows in the upper 30's to mid 40's by morning. Our stretch of beautiful autumnal weather continues through at least the next week! With little to no chance of rain. By Sunday morning we should see lows in the low to mid 30's with a freeze possible in the colder valleys! Temperatures will run about 5 degrees below normal through Sunday before we return to near normal by Monday, but by Tuesday we warm to about 3 degrees above normal. Of note 82 years ago today back in 1944 the Chester County Area was on the last day of a 2 day storm that left as much as 1.63" of rain at Phoenixville 1E. This was the remnants of an unnamed hurricane which tracked within about 120 miles of the county.

Today we should see highs from low 60's in ridge locations to the mid 60's in valley spots. Temperatures will fall from the low 50's at midnight to lows in the upper 30's to mid 40's by morning. Our stretch of beautiful autumnal weather continues through at least the next week! With little to no chance of rain. By Sunday morning we should see lows in the low to mid 30's with a freeze possible in the colder valleys! Temperatures will run about 5 degrees below normal through Sunday before we return to near normal by Monday, but by Tuesday we warm to about 3 degrees above normal. Of note 82 years ago today back in 1944 the Chester County Area was on the last day of a 2 day storm that left as much as 1.63" of rain at Phoenixville 1E. This was the remnants of an unnamed hurricane which tracked within about 120 miles of the county.

Over the last 25 years, Since 2001 PHL Airport warming is statistically clear in both its raw and NOAA-adjusted records. By comparison here in the nearby philly burbs of Chester County PA our warming is less or about 40% smaller than the PHL heat island. The warming across Chester County has not been statistically significant using either the raw or NCEI adjusted data over the last 25 years! The gap between the two (+0.34°F/decade) is consistent with an urban/airport effect. One more point of interest: NOAA’s data adjustment only trims PHL’s trend slightly (0.86 → 0.78). So, importantly whatever UHI warming that is in the airport record over this window, the homogenization is removing very little of it!

Over the last 25 years, Since 2001 PHL Airports warming is statistically clear in both its raw and NOAA-adjusted records. By comparison Chester County’s warming is about 40% smaller and not statistically significant using either the raw or NCEI adjusted data. The gap between the two (+0.34°F/decade) is consistent with an urban/airport effect. One more point of interest: NOAA’s data adjustment only trims PHL’s trend slightly (0.86 → 0.78). So, importantly whatever UHI warming that is in the airport record over this window, the homogenization is removing very little of it!

Today we should see highs from low 60's in ridge locations to the mid 60's in valley spots with lows tonight in the upper 30's to low 40's. It should be one of the better weather weeks of the year with almost no chance of rain. By Sunday morning we should see lows in the low to mid 30's with a freeze possible in the colder valleys! Temperatures will be near normal through Friday but this weekend we drop to about 5 degrees below normal, before we return to near normal by Monday. Of note 82 years ago today back in 1944 the Chester County Area was at the start of a 2 day storm that left as much as 1.63" of rain at Phoenixville 1E. This was the remnants of an unnamed hurricane which tracked within about 120 miles of the county.

Today we should see highs from low 60's in ridge locations to the mid 60's in valley spots with lows tonight in the upper 30's to low 40's. It should be one of the better weather weeks of the year with almost no chance of rain. By Sunday morning we should see lows in the low to mid 30's with a freeze possible in the colder valleys! Temperatures will be near normal through Friday but this weekend we drop to about 5 degrees below normal, before we return to near normal by Monday. Of note 82 years ago today back in 1944 the Chester County Area was at the start of a 2 day storm that left as much as 1.63" of rain at Phoenixville 1E. This was the remnants of an unnamed hurricane which tracked within about 120 miles of the county.

I have added some additionals stations within 3 miles of the Chester County border to enhance our climate data. The support and rationale is included in our latest study on the website. Thanks! https://chescowx.com/chester-county-area-3-mile-rule/

I have added some additionals stations within 3 miles of the Chester County border to enhance our climate data. The support and rationale is included in our latest study on the website. Thanks! https://chescowx.com/chester-county-area-3-mile-rule/

Over the last 25 years Chester County has shown minor but not significant warming....however PHL Airport is as always off to the races with warming.

No data is of course perfect but it is the best historical validated data we have from the time of record

Almost a 20 degree spread in morning low temperatures today within just a few miles across the area this morning. Elevation and terrain impacts.

Almost a 20 degree spread in morning low temperatures today within just a few miles across the area this morning. Elevation and terrain impacts.

The minute we put the words scientific and consensus together we know it is fake news!

Today we should see highs from mid 60's in ridge locations to the low 70's in valley spots with lows tonight in the upper 30's to low 40's. It should be one of the better weather weeks of the year with almost no chance of rain. By Saturday morning we should see lows in the low to mid 30's with a freeze possible in the colder valleys! Temperatures will be near normal through Thursday but by Friday we drop to about 5 degrees below normal, before we return to near normal by Sunday. Of note 7 years ago today back in 2019 Chester County was at the start of a 3 day storm that left as much as 1.56" of rain at Coatesville 1E. This was the remnants of Tropical Storm Nestor which tracked within about 190 miles of the county.

Today we should see highs from mid 60's in ridge locations to the low 70's in valley spots with lows tonight in the upper 30's to low 40's. It should be one of the better weather weeks of the year with almost no chance of rain. By Saturday morning we should see lows in the low to mid 30's with a freeze possible in the colder valleys! Temperatures will be near normal through Thursday but by Friday we drop to about 5 degrees below normal, before we return to near normal by Sunday. Of note 7 years ago today back in 2019 Chester County was at the start of a 3 day storm that left as much as 1.56" of rain at Coatesville 1E. This was the remnants of Tropical Storm Nestor which tracked within about 190 miles of the county.