A trio of upper lows will dominate the weather. The first of these is along the coastal border of California/Oregon and will lead to showers, particularly during the peak heating of the day. There may be pockets of heavy rainfall anywhere near this upper low center. The second upper low will linger around the Big Bend of Texas and produce moderate to heavy rains across south Texas/northeastern Mexico. The third upper low will trigger numerous showers and thunderstorms as it meanders about the Georgia/Florida Panhandle border.
A slow-moving frontal system which will stretch from the upper Central Plains eastward into the Northeast. To the south of this front, abundant warmth is expected with near to above 100 degree temperatures possible from the Mid-Mississippi Valley and into the upper Ohio Valley. Numerous thunderstorms should erupt along the front, especially in the interiror Northeast.
There is a slight risk of severe thunderstorms across the northern Plains and from western and northern New York to northern New England.
Temperatures surpassing the century mark are possible from the Mid-Mississippi Valley toward the upper Ohio Valley on Tuesday. Local forecast offices over this region have already issued Heat Advisories for the hot temperatures on Tuesday. Excessive Heat Warnings have also been issued for parts of Michigan and Indiana as well as the Philadelphia area.
Red Flag warnings are in effect for the Pacific Northwest. Conditions across the west have left vegetation dry and vulnerable in the event of a lightning strike.
At 200 AM PDT the center of Tropical Storm Fabio was located about 675 miles west of the southern tip of Baja California. Movement was toward the north near 9 MPH. This motion is expected to continue for the next 24 hours with a gradual turn to the north-northeast thereafter. Maximum sustained winds were near 50 MPH with higher gusts. Weakening is forecast and Fabio could become a remnant low on Wednesday or sooner.