FIRE WEATHER WATCH FOR: Central Cascade Mountains Central Cascade Valleys Eastern Washington East Columbia Basin North Cascades Northeast Mountains Northern Columbia Basin Okanogan Highlands Okanogan Valley South Central Cascade Mountains South Central Cascade Valleys ...Fire weather watch for dry and unstable conditions cascades monday and abundant lightning over the entire region tuesday and wednesday... .A strong low pressure system will move over the districts over the next two days producing a long period of critical fire weather conditions. A strong...Hot and dry surface thermal trough will creep into the east slopes of the cascades on monday promoting the potential for plume dominated fire behavior. As the thermal trough continues to migrate eastward monday night and tuesday an incoming low pressure will promote increasing thunderstorm activity from southwest to northeast across all districts. Abundant lightning is possible starting monday evening in the cascades and spreading into the idaho panhandle by tuesday evening. Strong gusty winds are possible with these thunderstorms. ...Fire weather watch remains in effect from monday morning through wednesday afternoon for dry and unstable conditions followed by thunderstorms with abundant lightning for fire weather zones 673...676...677...680...682...684...685 and 687... * Affected area: fire weather zone 673 east washington northern columbia basin (zone 673)...Fire weather zone 676 east washington south central cascade valleys (zone 676)...Fire weather zone 677 east washington central cascade valleys (zone 677)...Fire weather zone 680 east washington south central cascade mountains (zone 680)...Fire weather zone 682 east washington central cascade mountains (zone 682)...Fire weather zone 684 east washington okanogan/methow valleys (zone 684)... Fire weather zone 685 east washington north cascades (zone 685) and fire weather zone 687 east washington okanogan highlands (zone 687). * Instability: a surface thermal trough passing over the east slopes of the cascades monday will result in a very unstable low level atmosphere. * Humidity: minimum relative humidity will range from 8 to 10 percent in the columbia basin and okanogan highlands to 10 to 20 percent in the east slopes cascade districts. * Thunderstorms: initially dry isolated lal 2 thunderstorms will begin over the cascades monday evening and spread into the columbia basin and okanogan highlands overnight monday night. Thunderstorms will become increasingly wet and increase to scattered coverage during the day tuesday with lal of 3 to 4. Scattered wet thunderstorms will continue through wednesday. * Winds: gusty outflow winds are possible near thunderstorms. In addition winds will become westerly and locally breezy through the kittitas and wenatchee valleys tuesday afternoon and evening as cooler air begins to bleed into the region. * Impacts: highly unstable and dry conditions will promote plume dominated behavior on existing fires. Abundant lightning with thunderstorms and dry fuels will promote new fire starts. A fire weather watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible red flag warnings.
Posted on: Mon, 11 Aug 2014 06:00:07 +0000
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