WEATHER: Heat Advisory and risk for severe storms Friday

Posted at 4:27 AM, Jul 27, 2012
and last updated 2012-07-27 12:42:29-04

RICHMOND, Va. (WTVR) – A Heat Advisory is in effect again Friday for the same heat index values that plagued central Virginia on Thursday, ranging 105 to 109 degrees. Our afternoon heating may be exacerbated by an approaching upper-level trough and surface cool front, which can aid the warming occurring ahead of the front (compressional heating). In addition, the hot southwest wind that we experienced yesterday persists Friday until the cold front nears us from the northwest this evening.

The approaching cold front will also help force strong to severe thunderstorms to form this afternoon and evening as it moves through the Commonwealth. Our threats in central Virginia will be for thunderstorms capable of damaging wind gusts in excess of 60 mph, as well as large hail. In addition, any strong storms that form will also have frequent lightning and torrential downpours. Although an isolated, brief tornado cannot be ruled out, especially east of I-95, the overall chance for this is low. The primary concern remains damaging wind gusts.

Air Quality for today is slightly elevated into the Yellow range, which is unhealthy for the most sensitive groups.

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