US

Weather Underground Forecast for Monday, July 06, 2009.

Several weather disturbances will produce areas of active weather across the nation on Monday.

In the South, a frontal boundary will remain stretched from Texas through the southeastern states. Significant moisture from the Gulf of Mexico will spread across these states and combine with afternoon heating to enhance instability along this front. This will translate into a considerable amount of scattered showers and thunderstorms across these regions. The heaviest amounts of precipitation and strongest thunderstorms are expected to develop throughout Louisiana as an area of low pressure settles over the Lower Mississippi Valley.

In the West, a trough of low pressure will extend from eastern Wyoming through eastern New Mexico, yielding to unsettling weather activity throughout the Central and Southern High Plains. Intense afternoon heating will make atmospheric conditions ripe for strong to severe isolated thunderstorms throughout the afternoon and evening.

Meanwhile, a larger area of low pressure and an associated cold front will bring cool and light showers to the Northwest Coast and active weather to the Northern US. The cold front will advance across Montana, instigating scattered strong to severe thunderstorms from the Northern High Plains to the Northern Plains.

Temperatures in the Lower 48 states Sunday ranged from a low of 30 degrees at Mammoth, Calif to a high of 113 degrees at Thermal, Calif.