Weather Underground Forecast for Saturday, August 17, 2013.
Moisture from the Gulf of Mexico will continue streaming northward over the Southeastern states on Saturday. This will bring more heavy rainfall and strong thunderstorms to the region. Flood warnings and advisories will remain in effect from the panhandle of Florida through the Carolinas and into the Mid-Atlantic states. Rainfall totals in these areas will approach 4 inches again, reaching over 6 inches for the combined rainfall since Friday morning. North of this activity, high pressure over the Great Lakes and Northeast remains the dominant weather feature over the rest of the Eastern states. This system will maintain dry and pleasant weather from the upper Midwest through the Ohio River valley and Northeast. High temperatures will remain in the lower 80s for these areas.
Just west of this system, a trough of low pressure moving through central Canada extends into the north-central U.S. This will increase chances of showers and thunderstorms as it slides eastward across the northern Plains on Saturday. Heavy rainfall and strong storms are not anticipated with this system.
Out West, chances of showers and thunderstorms will continue across the Four Corners as monsoonal moisture lingers over the region. Storms will be isolated and are not expected to turn severe.
Temperatures in the Lower 48 states Friday have ranged from a morning low of 32 degrees at West Yellowstone, Mont. to a high of 107 degrees at Phoenix, Ariz.