Technical Pennsylvania Forecast Discussion
Updated 6:41 PM ET 4/18/2010
SYNOPSIS…
High Pressure will build across the Great Lakes as low pressure lingers over SE Canada during the next few days. The high will slide into the Ohio Valley by Tuesday, as low pressure pushes in behind it. A weak cutoff low will form over the Southeastern US, with another low and its associated fronts sliding into the Great Lakes and eventually into the Northeast by Wednesday night into Thursday.
Short and Long Term…
Clouds will temporarily decrease overnight tonight for much of PA, with cooler temperatures. Seasonal temps and SCT to OVC conditions will return with a weak N flow. Some uncertainty exists in the models over the amount of CU, as the high low level RH persist through Wednesday on some runs. However, all models agree on no precipitation for PA through TUE, as a ridge builds in from the Great Lakes. Cutoff will develop over the SE, before it marches to the ENE. A weak relatively cold front associated with low over SE Canada will slide in behind the cut off low on WED and THU, as the low moves out to sea. All of the state will see a CHC of showers on Wednesday night or Thursday, with some FRZ precipitation mixing in across the NERN zones and the higher elevations. A little bit of uncertainty on how much precipitation some of the zones will see, but all models seem to favor the front drying out as it passes. Temperatures should stay seasonal until front passes.
Forecaster: Michael Kozar
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Michael Kozar
The Pennsylvania State University
College of Earth and Mineral Sciences
Integrated Undergraduate/Graduate of Meteorology, Class of 2011
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