...ISOLATED TO SCATTERED THUNDERSTORMS THROUGH THURSDAY EVENING. ISOLATED THUNDERSTORMS ACROSS THE NORTHERN MOUNTAINS THURSDAY NIGHT... ...GUSTY SOUTHERLY WINDS OKANOGAN AND METHOW VALLEYS FRIDAY... .In Central Washington scattered showers and thunderstorms are tracking through Central WA this morning. This activity is expected become isolated going into the afternoon. Additional showers and storms will redevelop overnight. In Eastern Washington, scattered thunderstorms are expected to develop in the afternoon and track southwest to northeast into the evening. A few storms could be strong during this time with frequent lightning and hail. Gusty outflow winds around 60 mph will be possible with this activity. * Affected Area: East Washington Central Cascades (Zone 696), East Portion of North Cascades National Park/Lake Chelan National Recreation Area (Zone 697), East Washington North Cascades (Zone 698), Foothills of Central Washington Cascades (Zone 705) and Waterville Plateau (Zone 706). * Thunderstorms: Isolated to scattered coverage. A mix of wet and dry thunderstorms with rainfall amounts less than a tenth of an inch. Locally higher rainfall amounts possible where multiple storms move over the same area. * Outflow Winds: Erratic outflow winds ranging from 20 to 40 mph. * Winds: Today: Southeast 8 to 15 mph gusts to 25 mph becoming northwest this evening 10 to 15 mph gusts 25 mph. Erratic winds near showers and thunderstorms. Friday: Southeast 15 to 20 mph gusts 25 to 30 mph. * Impacts: New fire starts from lightning. New or existing fires could be impacted by gusty outflow winds.