Administrators NorthGeorgiaWX Posted July 23 Administrators Posted July 23 SPC Day 2 Fire Weather Outlook Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0201 AM CDT Tue Jul 23 2024 Valid 241200Z - 251200Z ...CRITICAL FIRE WEATHER AREA FOR PORTIONS OF EASTERN OREGON...IDAHO AND WESTERN MONTANA... ...Synopsis... An upper ridge over the Rockies will gradually break down under the influence of a deepening Pacific trough entrenched over the Northwest. Strong mid-level flow moving onshore will aid in mid-level destabilization, supporting scattered to widespread thunderstorms and the potential for significant lightning Wed afternoon and evening. Dry downslope winds are also possible in the lee of the Cascades supporting elevated fire-weather potential. ...Northern Great Basin Northwest and the northern Rockies... A widespread and potentially significant lightning event appears possible over parts of the Northwest and northern Rockies Wed and Wed night. As the upper trough over the northwest continues to deepen, weak height falls and stronger flow aloft will gradually overspread the Intermountain West. Diurnal heating with increasing mid-level moisture (PWATs of 0.8-1 in) will support elevated buoyancy atop deep and well-mixed boundary layers. In addition to the very dry sub-cloud layer, mean storm motions of 35-40 kt suggest poor to very poor precipitation efficiency. Scattered thunderstorms appear likely by early to mid afternoon ahead of a weak cold front and across the higher terrain of eastern OR, central ID and west-central MT. Storm coverage should gradually increase through the afternoon and evening as storms move east/northeast into the northern Rockies. Scattered to numerous cloud to ground lightning strikes, and occasional strong downdrafts will be possible over areas of very dry fuels, warranting the introduction of Critical Dry Thunder probabilities. In addition to the Critical risk for lightning, increasing flow aloft twill support gusty downslope winds and low RH in the lee of the Cascades. Very warm temperatures and wind gusts of 15-25 mph will overlap with RH below 20% across the western Columbia Basin and Cascade Gaps, as well as across western MT. With numerous ongoing fires and robust fuels, elevated to locally critical fire-weather conditions are expected across parts of the Pacific Northwest and northern Rockies Wed. ..Lyons.. 07/23/2024 ...Please see www.spc.noaa.gov/fire for graphic product... Read more View the full article Quote
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