US

Weather Underground Forecast for Saturday, July 04, 2009.

Independence Day will bring an eventful weather pattern to the Central US as a trough of low pressure moves through a dominating high pressure system.

A low pressure system moving through the Central Plains will kick up scattered showers and thunderstorms over the Upper Midwest and Mid-Mississippi River Valley, approaching the Ohio River Valley throughout the day. This will allow for wet weather and periods of heavy rainfall in areas of thunderstorm development. The Northern Plains may see scattered isolated thunderstorms develop in the afternoon, while the Southern Plains will remain hot and humid with highs approaching 100 degrees.

In the Northeast, a low pressure system will weaken and push out of the region, but at the same time, another cold front will move in from the north and kick up light and scattered showers along the Canadian border. Moving down the East Coast, warm and humid conditions are expected with highs in the 80s and 90s as a ridge of high pressure lingers over the region. In the Southeast, a stationary frontal boundary will remain over the Gulf states and continue triggering moderate to heavy showers and thunderstorms. Expect humid conditions with highs remaining in the 90s.

Out West, high pressure will allow for hot and dry weather on Saturday. Expect plenty of sunshine with another day of highs in the 80s and 90s. Monsoonal moisture will continue to pour into the Southwest from Baja California. Expect partly cloudy skies developing into scattered thunderstorms by evening with highs in the 90s and 100s.

Temperatures in the Lower 48 states Friday ranged from a low of 35 degrees at Polebridge, Mont. to a high of 118 degrees at Death Valley, Calif.