Weather Headlines

A late summer weather pattern, with daily chances for showers and local downpours in thunderstorms (mainly hit or miss during afternoon and early evening hours), will continue through coming days.

A notable difference being cooler temperatures, versus average, for this time of year, with more typical August heating not returning until later this weekend into next week when the atmosphere expands vertically.

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Interactive Lightning And Storm Tracking Doppler

Tropical Storm Isaias, which is likely to become a hurricane once again, will dominate regional weather conditions through early this week.

Although wind shear will increase again beyond 24-hours, Isaias is in position for intensification late Sunday and will later develop more extensive impacts due to enhanced upper-level divergence within the right-rear quadrant of a upper-level jet streak.

Isaias will become absorbed, or partially absorbed, into a upper-level trough, the axis of which (below) was over the Mississippi River Valley at 8:00 PM Sunday, and will become a more potent weather maker for the entire expanse of the eastern seaboard Monday into Wednesday. Isaias will be a potent rain producer given upper-level divergence aloft lifting tropical moisture vertically above a major population corridor.

I like the European Model and its ensemble mean best for handling of the upper-level dynamics, although both the GFS and high-resolution NAM are in general agreement, with indirect rain and thunderstorm development likely in the southern-central Appalachians.

With deep low pressure (Hurricane Isaias) moving across the eastern Carolina’s and Virginia, inflow and terrain convergence, in association initially (at least Monday) with upper-level divergence, will favor shower and thunderstorm development along both flanks of the Appalachian chain.

Locally strong-severe thunderstorm development will be possible.

Stay tuned to NOAA Weather Radio and your favorite media sources for possible alerts and warnings which may be needed through early this week.