Friday, September 27, 2013

Central PA's Dry Island

Philly is running with normal rainfall so far this month but it, and the immediate Philly burbs, are a bit of an exception to the rest of the region. Atlantic City is running about an inch and a half below average since the start of September and Allentown is nearly two inches below average.

It's not a cause for alarm -- our stretch of dry weather is relatively normal given this is one of the times of the year where rainfall tends to fall a bit less frequently.  However, it is a flip of the switch from the seemingly endless rainfall of June, July, and August.

If we were to get a rainfall event tomorrow around the region, six hour flood guidance (left) has much of the region in the four and five inch category. The only areas that would be below three inches would be around Lansdale in Montgomery County (the little green dot on the map above), plus North Jersey.

Granted, this isn't a "pray for rain, omg we're in a drought" moment...especially here given this summer's epic rains, but it has been dry of late and will be dry for a while yet, probably a week or so.  This is a byproduct of the nice weather regime we're dealing with and outlined earlier today!

Where's it been a bit of an issue is Central Pennsylvania. 60 day rainfall departures through Central Pennsylvania average between three and five inches below where they should be. In fact, Central Pennsylvania is in enough of a dry spell to warrant the "abnormally dry" shade on the Drought Monitor.

It does appear we may have a shot at rain next weekend or in the early parts of the following week (October 6th).