Moderate

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Portions of central, north central, and northeast South Dakota. * WHEN...Until 11 AM CDT this morning. * IMPACTS...Low visibility could make driving conditions hazardous. If driving, slow down, use your headlights, and leave plenty of distance ahead of you.

* WHAT...South winds 15 to 25 mph with gusts up to 40 mph expected. * WHERE...Fort Peck Lake * WHEN...From 8 AM this morning to 9 AM MDT Saturday. * IMPACTS...Strong lake winds could produce rough waves which can overturn or swamp small craft. * ADDITIONAL DETAILS...Waves up to 4 feet will be possible. Boaters on Fort Peck Lake should use extra caution. For your protection stay in or around sheltered areas to prevent your craft from tipping.

* WHAT...For the Gale Warning, seas 11 to 15 ft at 10 seconds and southwest winds 20 to 30 kt. For the Hazardous Seas Warning, very steep and hazardous seas 10 to 14 ft at 10 seconds and west winds 15 to 25 kt with gusts up to 30 kt expected. * WHERE...In the Main Channel of the Columbia River Bar. * WHEN...Gale Warning, until 2 PM PDT this afternoon. Hazardous Seas Warning, from 2 PM this afternoon to 8 PM PDT this evening. * IMPACTS...Strong winds will cause hazardous seas which could

* WHAT...For the Gale Warning, seas 11 to 16 ft at 10 seconds and southwest winds 25 to 35 kt with gusts up to 40 kt. For the Hazardous Seas Warning, very steep and hazardous seas 8 to 13 ft at 10 seconds and west winds 10 to 25 kt expected. * WHERE...Coastal waters from Cape Foulweather to Florence OR out 10 NM and Waters from Cape Foulweather to Florence OR from 10 to 60 NM. * WHEN...Gale Warning, until 11 AM PDT this morning. Hazardous Seas Warning, from 11 AM this morning to 5 PM PDT this afternoon.

* WHAT...For the Gale Warning, seas 12 to 17 ft at 10 seconds and west winds 25 to 35 kt with gusts up to 40 kt. For the Hazardous Seas Warning, very steep and hazardous seas 8 to 13 ft at 9 seconds and northwest winds 10 to 20 kt with gusts up to 30 kt expected. * WHERE...Coastal waters from Cape Shoalwater WA to Cape Falcon OR out 10 NM, Coastal waters from Cape Falcon to Cape Foulweather OR out 10 NM, Waters from Cape Shoalwater WA to

* WHAT...Southwest winds 10 to 20 mph with gusts up to 50 mph expected. * WHERE...Upper Hood River Valley, particularly areas west of Oregon Route 281. * WHEN...From 8 AM this morning to 8 PM PDT this evening. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. * ADDITIONAL DETAILS...Full leaf cover on trees may result in trees or limbs suffering wind damage at lower wind speeds than usual.

* WHAT...South winds 15 to 25 mph with gusts up to 45 mph expected. * WHERE...In Oregon, East Central Willamette Valley, East Portland Metro, Inner Portland Metro, Outer Southeast Portland Metro, Portland West Hills and Chehalem Mountain, Tualatin Valley, and West Central Willamette Valley Counties. In Washington, East Clark County Lowlands, Inner Vancouver Metro, and North Clark County Lowlands Counties. * WHEN...Until 11 AM PDT this morning. * IMPACTS...Gusty winds will blow around unsecured objects. Tree

The combination of clear skies and nearly calm winds this morning has led to areas of fog developing, particularly along the river valleys. However, some transient overland fog has developed, which may be locally dense in spots. Fog is expected to burn off shortly after daybreak. Motorists should be prepared for rapid changes in visibility. Allow for greater distances between vehicles, use low beam headlights, and allow extra time to reach your destination.

* WHAT...This level of heat affects most individuals sensitive to heat, especially those without effective cooling and/or adequate hydration. * WHERE...All of Puerto Rico, including Vieques and Culebra, and the U.S. Virgin Islands. * WHEN...From 10 AM this morning to 3 PM AST this afternoon. * IMPACTS...High temperatures or elevated heat indices can worsen symptoms in people with chronic conditions. They can also increase the risk of heat-related illness among individuals sensitive to

* WHAT...For the High Surf Advisory, large breaking waves of 8 to 12 feet in the surf zone. For the Beach Hazards Statement, a high risk of rip currents. For the Coastal Flood Warning, one to two feet of inundation above ground level expected in low-lying areas near shorelines and tidal waterways. * WHERE...In Maryland, the Maryland Beaches. In Virginia, Accomack and Northampton Counties. * WHEN...For the Coastal Flood Warning, until 10 AM EDT Saturday. For the High Surf Advisory, until 7 PM EDT Friday.