Eyes then turn to the Friday/Saturday time period where, if guidance
is any indication, significant rainfall is likely. This is thanks to
a coastal low sliding up from the Carolinas, pulled north ahead of
the trough digging into the Great Lakes. This has the potential to
bring showers and thunderstorms with gusty winds and very heavy
downpours. Confidence in rainfall amounts and placement is low,
depending heavily on the eventual low track. However, heavy rainfall
looks fairly certain with this system given a very potent tap of
tropical moisture...PWATs may cross into the 2.5-3 inch range! That
would be 2-4 standard deviations above normal for mid July and would
lead us to start thinking about the possibility of some flooding
issue