9/8 – Rob’s “Humidity Returns” Tuesday Morning Forecast
The trend of more humidity and high moisture content in the atmosphere is expected to really make a difference over the next couple days with a return of higher atmospheric content. The greatest increase will be today and Wednesday due to deeper and persistent southeast to south winds in the low to mid-levels. This will likely bring isolated to scattered, diurnally driven showers and thunderstorms to most areas today and that trend should continue into Wednesday with even higher coverage of showers and thunderstorms expected in areas south of the I-10 corridor.
A Four Corners to central Rockies cut-off low will move slowly during the Wed/Thur period. During this period, and extension of a large and deep layer ridge over the Atlantic will develop over the interior southeast U.S. into the lower Mississippi Valley on Thursday. The southern portion of the trough will not be anywhere near the Gulf coast, however the lower Mississippi Valley ridge will be suppressed and positioned more to the north and east again. There is no longer any push of drier air with a frontal boundary, but rather more moisture from easterlies and inverted trough features from Florida and the eastern Gulf coast into the central Gulf coast region over the weekend and early next week. This will mean typical September heat and humidity and daily rain chances from diurnally driven showers and thunderstorms.