Moderate

* WHAT...Wintry mix of snow, sleet, and freezing rain. Total snow accumulations of 2 to 4 inches. Light glaze ice accumulation possible. * WHERE...Central Copper Valley, Ernestine, Southern Copper Valley, and Western Copper Valley. * WHEN...Until 10 AM AKDT this morning. * IMPACTS...Travel could be very difficult. * ADDITIONAL DETAILS...Snow will continue across the southern Copper River Basin this morning. The snow may briefly change to a wintry mix of snow, sleet, and freezing rain before southerly winds

* 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 US Virgin Islands. * WHEN...Until 4 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...West to Southwest winds 30 to 40 mph with gusts up to 50 mph expected. * WHERE...Unalaska and Nikolski. * WHEN...Until 10 PM AKDT this evening. * IMPACTS...Gusty winds will blow around unsecured objects and a few power outages may result. Travel may be difficult. * ADDITIONAL DETAILS...A low pressure system in the southern Bering will bring strong westerly and southwesterly winds beginning this morning and continuing through this evening. Intermittent wind

UPDATED to raise the development potential of 94W to HIGH. ...HEAVY SHOWERS, GUSTY WINDS, AND CHOPPY SEAS LIKELY THIS WEEK FOR KWAJALEIN AND NORTHERN MARSHALL ISLANDS... A developing disturbance known as Invest 94W by the Joint Typhoon Warning Center (JTWC) is located about 60 miles northwest of Kwajalein. Development potential is rated high, meaning tropical cyclone formation is likely within 24 hours. Scatterometry data indicates 15 to 20 kt winds near Kwajalein, Ebadon, Ujae, Bikini, and

* WHAT...Visibility one half mile or less in dense fog. * WHERE...Foothills and Valleys of the North Cascades, Island County, Lowlands of Western Skagit and Northwestern Snohomish Counties, Lowlands of Western Whatcom County, Downtown Everett / Marysville Area, and Shoreline / Lynnwood / South Everett Area. * WHEN...Until 10 AM PDT 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...Visibility one half mile or less in dense fog. * WHERE...Lowlands of Lewis and Southern Thurston Counties. * WHEN...Until 10 AM PDT 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.

At 706 AM EDT, Doppler radar was tracking a strong thunderstorm near Crawfordville, moving northeast at 10 mph. HAZARD...Wind gusts up to 40 mph. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Locations impacted include... Crawfordville, St. Marks, Woodville, Wakulla, Newport, Shadeville, Hyde Park, Wakulla Springs, Arran, Tully, Plum Orchard, Shell Point, Port Leon, Medart, Wakulla Beach, Spring Creek, Bethel, Liveoak Island, and Vereen.

At 631 AM EDT, Doppler radar was tracking a strong thunderstorm over St George Island, moving north at 20 mph. HAZARD...Wind gusts up to 40 mph. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Locations impacted include... Carrabelle, St George Island, Eastpoint, Apalachicola, Franklin, Royal Bluff, High Bluff, Yent Place, St George Island St Pk, Beverly, Green Point, Creels, and Hays Place. If outdoors, consider seeking shelter inside a building.

* WHAT...High temperatures up to 101 with overnight temperatures over 65. Moderate to localized high HeatRisk. * WHERE...Southern Mendocino Interior, and Southern Lake. * WHEN...Until 11 PM PDT this evening. * IMPACTS...Moderate to localized high HeatRisk will increase the potential for heat illnesses. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Clatsop, Tillamook, Lincoln, and Lane County Coasts. * WHEN...Until 10 AM PDT this morning. * IMPACTS...Low visibility could make driving conditions hazardous. If driving, slow down and leave plenty of distance ahead of you. Pedestrians and cyclists should wear bright or reflective clothing to increase the chances of being seen by others in poor visibility conditions.