I talked about this in the Atlanta, GA weather thread, but if you live along the South/Central Plains and the Southeast, get ready to start preparing for this.

From the HPC
LOCATIONS FROM THE CENTRAL PLAINS ACROSS THE MID-SOUTH/TENNESSEE
VALLEY INTO THE MID-ATLANTIC STATES AND CAROLINAS ARE EXPECTED TO
BAKE...SIZZLE...AND FRY THIS PERIOD DUE TO A BURGEONING WARM CORE
RIDGE BUILDING ACROSS THE REGION.
THE 00Z ECMWF WAS THE HOTTEST
OF THE CURRENT GUIDANCE...WITH ITS ENSEMBLE MEAN EQUALLY
IMPRESSIVE. TO ACCOUNT FOR TEMPERATURE DIFFERENCES...WE FOLLOWED
A COMPROMISE OF THE 00Z GEFS MEAN AND 00Z ECMWF.
TEMPERATURES AT
THE 850 HPA LEVEL ARE EXPECTED TO BE NEAR 27C/82F...WHICH WOULD
EQUATE TO TEMPERATURES APPROACHING 110F EACH AFTERNOON. IF DEBBY
DEPARTS FASTER THAN THE NHC FORECAST /OR REMAINS A STRONGER SYSTEM
THAN CURRENTLY ANTICIPATED/ ALONG THE LINES OF THE NON-UKMET
DETERMINISTIC GUIDANCE...HIGH TEMPERATURES COULD BE EVEN MORE
IMPRESSIVE IN ITS WAKE ACROSS THE SOUTHEAST AND MID-SOUTH.http://www.hpc.ncep.noaa.gov/discussions/hpcdiscussions.php?disc=pmdepd