Area Forecast Discussion
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000 FXUS61 KPBZ 141550 AFDPBZ Area Forecast Discussion National Weather Service Pittsburgh PA 1150 AM EDT Mon Aug 14 2017 .SYNOPSIS... Although most locations will remain dry, a series of disturbances is forecast to cross the region and cause some local showers and storms through mid week. && .NEAR TERM /THROUGH TONIGHT/...
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With noon update, have tweaked sky grids across northwestern counties to account for partial clearing. Also went with 100 pops in southeastern counties with widespread rainfall occurring. Bulk of precipitation should come to an end by sunset, although lingering showers could continue into the overnight hours.
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&& .SHORT TERM /TUESDAY THROUGH THURSDAY/... Dynamics associated with a shortwave digging eastward across the Great Lakes on Tuesday may clip the I 80 corridor as per the latest NAM and GFS depictions. Have thus restructured some minimal POPs over northern, and ridge zones for that scenario as per favorable afternoon timing. Rising heights via overall shortwave ridging support a warmer Wednesday forecast, but an embedded impulse may mar a dry forecast as it traverses the weak boundary anticipated over zones south of I 70. Isolated/slight POPs were maintained overnight as that boundary will be surging northward as a warm front in response to deepening low pressure over the Upper MS Valley. That low is projected to stay well north, but the associated frontal system is likely to spawn showers and storms on Thursday. Overall low amplitude flow will maintain seasonable temperature for the period. && .LONG TERM /THURSDAY NIGHT THROUGH SUNDAY/... Periodic rain chances are projected for the long term period as per a series of crossing shortwave troughs. Temperature under this pattern will remain near the seasonal averages. && .AVIATION /16Z MONDAY THROUGH FRIDAY/... A weak shortwave tracking NE from the TN valley will bring clouds today, along with shower chances toward MGW. .OUTLOOK... Localized erly mrng fog psbl thru the week. Widespread restriction potential returns with a Thu/Fri cold front. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...None. OH...None. PA...None. WV...None. && $$

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