The nation's weather

AP News
Posted: Dec 17, 2009 4:49 AM

Another round of wet, wintry weather was forecast to develop throughout the Pacific Northwest as yet another disturbance approached the region on Thursday. Moist, onshore flow from the Pacific was expected to continue to pour across the Pacific Northwest Coast as a trough of low pressure and its associated cold front trekked toward the shoreline. This activity was expected to translate into areas of low elevation rainfall and high elevation snowfall. Neither drastic temperature changes nor significant rain or snow were forecast.

To the south, a ridge of high pressure was forecast to build back over California and keep showery weather restricted to the northernmost regions of the state. Dry and mild conditions were expected to last through the weekend.

Significant showers and heavy rainfall were expected in eastern Texas and near the central Gulf Coast as an area of low pressure along a frontal boundary strengthened in the Gulf. Southeastern Texas and Louisiana were set to see the strongest concentrations of precipitation throughout the day. Strong winds and high seas were also likely to accompany unsettling weather near the coast. Meanwhile, energy along the frontal boundary was expected to spark showers and isolated to scattered thunderstorms in the Florida Peninsula.

Cold weather was forecast to spread from the Northern and Central Plains into the Northeast. As the system left, temperatures in the Plains would begin to warm again. Cold air over the Great Lakes and the Northeast was expected to trigger areas of lake effect snow showers during the afternoon, along with lower daytime highs.

On Wednesday, temperatures in the Lower 48 states ranged from a low of -37 degrees at Westby, Montana to a high of 87 degrees at Miami, Florida.