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National Situation Update: Sunday, March 11, 2007

Homeland Security Threat Level: YELLOW (ELEVATED).

National Weather

West: Much of this area of the country is enjoying unseasonably warm weather under a high pressure area centered over Utah. Record high temperatures are forecast for the Desert Southwest and Great Basin with some locations hitting the 90 degree mark. Moisture from the tropics near Hawaii, the pineapple express, is streaming toward western Washington. The moist west to southwest winds will continue to produce heavy precipitation on the west-facing slopes of the Olympics and Cascades with snow above 8000 feet. This precipitation along with the melting snow pack will produce river flooding in western Washington and Oregon.

Midwest: A low pressure system moving across the Southern Plains will produce rain over New Mexico, Texas, Oklahoma and Kansas. West Texas will have severe weather in the form of thunderstorms for most of the day. Local rainfall totals from 1 to 3 inches may trigger flash flooding from southwest Oklahoma into West Texas through early Monday. Melting snowpack will result in minor flooding in many of the river basins in the upper Midwest. High temperatures will range from the 40s in the Upper Midwest and Great Lakes to 60s in the Missouri Valley to the Lower Ohio Valley.

Northeast: A weak frontal system moving off the East Coast will produce light rain and a few wet snowflakes this morning over coastal New England. High pressure moving in behind the front will bring generally clear skies to the entire region by the afternoon. In much of northern New York and New England river ice coverage is extensive and the ice is thick enough to jam during a quick thaw. Some flooding could result during spring thaw and break up. Highs will range from 50s in the Mid-Atlantic to 30s in Upstate New York and northern New England.

South: Only a few light showers along a weak frontal system are forecast for South Carolina and Georgia. High temperatures will range from the 70s the in the Carolinas to 80s in the  Deep South. (NWS, media sources)

Tropical Weather Outlook

No new activity (FEMA HQ)

Earthquake Activity

No new activity (FEMA HQ)

Preliminary Damage Assessments

No new activity (FEMA HQ)

Disaster Declaration Activity

No new activity (FEMA HQ)