Numerous thunderstorms rumbled across the First Coast Wed. afternoon dumping heavy rain & producing gusty winds & intense lightning. 3" fell in Lake City...2.24" in San Marco with a monthly total of 13.89"! -- more than half the total of 26.96" since from Jan. through June! Fleming Island measured 1.12" but has had 11.54" for the month. But few areas have been as wet as Gainesville where 3.55" poured down Wed. pushing the monthly total to an all-time July record of 16.65"! which beat the old record of 16.41" set in 1909.
The first photo below shows the intersection at University Ave. late Wed. Other photos below....my daughter was very proud -- & rightly so -- of the lightning bolt she captured....Dennis Treco sent in a photo of a tree toppled & stripped of its bark by lightning...David Carlson, downtown Jax...Donna Yost-Williams at JIA...& Robert Samuel at the World Golf Village.
More storms for Thu. The cause of the recent uptick is yet another unseasonable upper level trough dipping far to the south over the Eastern U.S. Such a set-up creates an especially unstable atmosphere with quick t'storm development by midday that will continue through the afternoon with storms moving E/SE. There may be just enough upper level cool air Thu. to allow for some hail as well. The trough will move out fairly quickly by Fri. through the weekend taking us back to a more "normal" pattern of scattered afternoon storms mostly generated by sea breezes. Radar imagery below courtesy our Jax N.W.S.
So we now turn the calendar to August. The averages for JIA:
Low / High 73 / 92 72 / 89
SR / SS 6:45am / 8:20pm 7:03am / 7:50pm - lose 48 min. of daylight!
The tropics -- at least in the Atlantic -- are very quiet as we begin the traditionally busier time of the hurricane season. One of the reasons is a very dry mid & upper level atmosphere stretching from the Caribbean east across much of the Central Atlantic - see the water vapor image below.
Saharan dust moving west off of Africa can also hinder tropical waves that might otherwise try to develop. From NASA:
HS3 Mission to Investigate Saharan Dust NASA's HS3 hurricane mission will address the controversial role of the Saharan Air Layer in tropical storm formation and intensification as well as the role of deep convection in the inner-core region of storms. The Moderate Resolution Imaging Spectroradiometer or MODIS instrument aboard NASA's Terra satellite captured this image of a dust storm in the Sahara Desert and dust blowing into the eastern Atlantic Ocean on July 30, 2013 at 7:40 a.m. EDT. Credit for photo below: NASA Goddard MODIS Rapid Response Team