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Back-to-Back Pacific Storms to Impact the West Coast; Heavy Snow in the Central Appalachians

Back-to-back powerful Pacific storm systems to impact the Pacific Northwest and northern California through the end of this week with heavy rain, flooding, strong winds, and higher elevation mountain snow. A strong, long-duration atmospheric river will accompany the Pacific storms, bringing excessive rainfall and flash flooding to southwest Oregon and northwest California through the week. Read More >

Overview

A good growing season through spring and summer of 2023 led to decent grass fuel loading compared to the previous couple of years before vegetation went into winter dormancy. Dormant fuels and two weeks without precipitation leading into February 26th provided a very combustible environment when combined with abnormally warm temperatures (record breaking) and high winds on Monday, February 26th.  An upper level system first brought strong winds on Monday with sustained winds peaking between 25 and 39 mph out of the west. Wind gusts peaked around 55 mph with some locations briefly gusting up to 58 to 62 mph. Not only were the winds strong but relative humidity values also dropped to 12 to 18 percent. These conditions, combined with the dormant and dry state of vegetation, contributed to the development of large wildfires on the 26th. In addition to the weather conditions, rough terrain and limited accessibility contributed to challenges in firefighting efforts. The wildfires continued through the night aided by minimal recovery in relative humidity and only a short lived reduction in winds.

On the morning of the 27th, west to southwest winds quickly picked back up into the 25 to 35 mph range and gusts quickly exceeded 58 mph by the late morning hours. Frequent gusts increased to 65 to 70 mph during the afternoon hours and some areas experienced sustained winds in the 40 to 45 mph range for a few hours as well. With overnight low temperatures only in the 50s, afternoon temperatures rebounded rapidly into the 70s. Despite afternoon temperatures a few degrees cooler than the previous day (the 26th), relative humidity values fell into the 12 to 15 percent range. This prompted rapid growth of ongoing fires and contributed to initiation and growth of a few new fires across the combined Panhandles, some of which merged leading to megafires. The same system contributing to the high winds also pushed a cold front into the area from the north.  Fires that once were moving from west to east soon started to move from north to south behind the front. Winds behind the front continued to blow in the 25 to 35 mph range and gusting 40 to 50 mph. Communities that were initially on the right flank of the fire, out of harm's way, soon found themselves on the forward flank that was around 100 miles long.

There were roughly 9 named wildfires with some of these merging into one.  The 687 Reamer Fire which started on the 27th, the day after the Smokehouse Creek Fire started but it eventually burned into and merged with the Smokehouse Creek Fire. The two largest fires, the Windy Deuce Fire (~144,045 acres burned) and the Smokehouse Creek Fire (~1,058,482 acres burned), were finally 100% contained on March 16, 2024. It is estimated that 2,075 homes were directly impacted by the fire and within the fire perimeter. How many of these housing units are a complete loss is unknown at this time. The fires also left residents without electricity or gas for several days after the 27th of February. Many cattle and livestock were also lost. It is estimated that just over 4,000 lives will forever be changed by these fires. Also, there were two souls lost in the fires on the 27th.
 
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