Weather Underground Forecast for Tuesday, July 23, 2013.
Wet and unsettled weather will continue for the East on Tuesday. In the north, a low pressure trekking eastward through southeastern Canada will begin to lift north-northeastward through Quebec, while frontal disturbances associated with the system advance into the eastern third of the nation. An associated warm front will lift through northern Ne England with a wave of low pressure, stirring up scattered showers and chances of thunderstorms. Behind this activity, an associated cold front will trek eastward through the Midwest and is expected to reach from the Lower Great Lakes through the Ohio Valley and into the Central Plains by Tuesday evening. Strong to severe thunderstorms will become possible along and ahead parts of the cold front in the afternoon and evening hours. The Storm Prediction Center issued a slight risk of severe thunderstorm development for parts of the Central Plains, the Ozark Plateau, and the Mid-Mississippi and Ohio Valleys through Tuesday and into Tuesday night. Meanwhile, numerous scattered showers and thunderstorms are expected in the Mid-Atlantic and parts of the Southeast.
Elsewhere, an upper level disturbance will kick up rain and thunderstorms in the Northern Plains, while monsoonal moisture triggers showers and thunderstorms across the Desert Southwest, the Sierra Nevadas, and parts of the Central Great Basin.
Temperatures in the Lower 48 states Monday have ranged from a morning low of 30 degrees at Stanley, Idaho to a high of 100 degrees at Alva, Okla.