Saturday, June 02, 2012

Heavy Rains For Some, Not For All

Rainfall amounts last night ranged from just a few hundredths of an inch across inland South Jersey (0.09" in Millville) to over three inches in parts of Lancaster and York Counties.  The heavier rains fell to our west (in line with computer modeling suggesting that Central into Northeast Pennsylvania would be more at risk for heavier rainfall than areas east of I-95) but the lack of rain that fell in a pocket from Dover to Hammonton was arguably a bit surprising last night.

Philadelphia picked up 0.77" of rain yesterday -- not a terribly huge amount but it was a decent dent in the bucket.  Heavier rainfalls were across the northern and western suburbs -- Montco, Bucks, and Chester Counties all picked up over an inch of rain in general...with two inch totals common across Lancaster County and portions of Lehigh and Berks Counties on north into the Poconos.  Lancaster picked up 2.68" and Lititz, which is north of Lancaster, picked up 3.85" of rainfall last night.

Rainfall was heaviest in a band from near the PA/MD state line on I-83 (just south of York) northeast through Lancaster to just west of Reading in Berks County thanks to heavy thunderstorms that tracked through there in the early evening hours.  Doppler estimates (below) show the heavier rainfall reports generally west and northwest of the city and the relative dearth of rain falling across South Jersey last night.

There were a few flood concerns this morning across portions of the region -- generally the Perkiomen Creek in Montgomery County and the Little Lehigh in Lehigh County -- neither stream was flooding at a major level but some low lying flooding had occurred overnight.

It could've been worse, especially since we did have one tornado warning in Lower Montgomery and Central Bucks Counties during the 9 PM hour (nothing confirmed in terms of damage to my knowledge) but the atmosphere stabilized as the night wore on...and the severe weather threat transitioned into more of a rain and some wind threat as the line of storms that were raking through Central PA last night weakened as they hit our region.  That said, we did have a soggy (for most of us) and wind-swept (for some) night in the Delaware Valley.