Weather Underground Forecast for Thursday, August 23, 2012.
The Desert Southwest will see more active weather, while storms move through the Upper Midwest and Great Lakes on Thursday. A trough of low pressure moving through the Northern Plains will continue pushing a cold front through the North-Central US. This will trigger showers and thunderstorms as it continues moving southeastward over the Upper Midwest into the Great Lakes, stretching into the Central and Southern Plains. Some of these storms may turn severe with strong winds and large hail. Expect fire danger to remain high across the Central Plains due to increased lightning probability and prevailing dry conditions.
In the East, a ridge of high pressure remains the dominant weather feature, maintaining warm, dry, and sunny conditions from the Mississippi River Valley through the East Coast. However, the tail end of a stationary front will linger over the Gulf Coast, bringing a few more showers and thunderstorms to parts of Florida.
Out West, monsoonal moisture shifts eastward and covers the Four Corners region. This will allow for storms over the Sierra Nevadas to taper off, but persist from Arizona, Utah, Colorado, and New Mexico. Expect fire danger to remain high in these areas as dry surface conditions will allow for most precipitation to evaporate before reaching the ground. Thus, if lightning strikes ground and creates a fire, rapid fire spread will occur. Temperatures in the Lower 48 states Wednesday have ranged from a morning low of 36 degrees at Meacham, Ore. to a high of 98 degrees at Needles, Calif.