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An expansive and unusually strong ridge of high pressure will build over the Eastern Seaboard through Saturday. The high pressure will be both at the surface and aloft, and allow for abundant sunshine and abnormally warm temperatures. This surface high (ridge) will be much like the mid-summer high pressure areas that commonly build over the Eastern Seaboard and Western Atlantic known as "Bermuda Highs." The southerly winds over the region will bring a noticeable increase in moisture as well as very warm temperatures.
These very warm conditions will last from Friday into at least Tuesday. So, late April will feel more like July. Daily temperatures will run 15 to 20 degrees above normal during this stretch, with afternoon highs in the 70s and 80s. |
North American Ensemble Forecast System (NAEFS)
Mean Surface Pressure Saturday Evening (25April2009). |
2009 Weather Features:
- Early (Earliest) Snow - October 15-16, 2009
- Heavy-Wet Snow Possible Thursday and Friday
- September 2009 Climate Summary
- Local Observer wins Thomas Jefferson Award
- August 2009 Climate Summary for Harrisburg and Williamsport
- Severe Weather Event - August 20, 2009
- Severe Weather of 9 August 2009
- Heavy Rains and Flooding - July 23, 2009
- Severe Weather of Sat July 11th
- Severe Weather Events - June 25&26, 2009
- Early (Earliest) Snow - October 15-16, 2009
- Heavy-Wet Snow Possible Thursday and Friday
- September 2009 Climate Summary
- Local Observer wins Thomas Jefferson Award
- August 2009 Climate Summary for Harrisburg and Williamsport
- Severe Weather Event - August 20, 2009
- Severe Weather Event - June 20, 2009
- Severe Weather Event - June 9, 2009
- Severe Weather Event - May 16, 2009
- Wet pattern of early May
- Heat Wave sets Record Highs
- Unusually warm weather in store.
- York County Straight Line Wind Damage Sunday afternoon Mar 29, 2009
- Tornado Damage in Lancaster County 29 March 2009
- Coastal Low and Deep Snow SE, March 1st-2nd, 2009
- Strong Winds, Feb 11th-12th, 2009
- Local Heavy Snow in Lancaster, PA Feb 3rd-4th, 2009
- Snow and Ice Storm, Jan 27-28th
- Low Temperatures Saturday 17 Jan
- State College Represents NWS at the PA Farm Show
- Heavy Snow in Central PA, Jan 10th
- Ice Storm then Heavy Rain in the South, Jan 6th-8th
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