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Devils Windstorm 2011 • Rhett Milne • Warning Coordination Meteorologist • National Weather Service – Reno NOAA National Weather Service weather.gov Storm Summary • Strong Winds 6pm-6am (Nov 30th-Dec 1st) • Core of Strongest winds 10pm-4am • Fairly long duration wind event of this magnitude • Most trees were uprooted not snapped and fell in NE/SW orientation • Exceptionally strong NNE Winds. Area used to very strong SW winds and some strong East winds. NOAA National Weather Service weather.gov NOAA National Weather Service weather.gov NOAA National Weather Service weather.gov NOAA National Weather Service weather.gov Not many drainages with NNE/SW Orientation NOAA National Weather Service weather.gov Strong Wind Channeling: Mammoth Crest-Minarets/Ritter Range Down the Middle Fork San Joaquin River accelerating NOAA National Weather Service weather.gov NOAA National Weather Service weather.gov NOAA National Weather Service weather.gov NOAA National Weather Service weather.gov Jet Stream 30,000 feet NOAA National Weather Service weather.gov NOAA National Weather Service weather.gov Jet Stream 30,000 feet NOAA National Weather Service weather.gov Winds 30 meters off the ground NOAA National Weather Service weather.gov NOAA National Weather Service weather.gov NOAA National Weather Service weather.gov NOAA National Weather Service weather.gov NOAA National Weather Service weather.gov NOAA National Weather Service weather.gov Surface Pressure Gradient NOAA National Weather Service weather.gov NOAA National Weather Service weather.gov NOAA National Weather Service weather.gov NOAA National Weather Service weather.gov Upward/Downward Motion at 10,000 feet NOAA National Weather Service weather.gov NOAA National Weather Service weather.gov NOAA National Weather Service weather.gov NOAA National Weather Service weather.gov Did the Jet Stream Touch Down? NOAA National Weather Service weather.gov NOAA National Weather Service weather.gov NOAA National Weather Service weather.gov NOAA National Weather Service weather.gov NOAA National Weather Service weather.gov NOAA National Weather Service weather.gov NOAA National Weather Service weather.gov Schematic - Crude NOAA National Weather Service weather.gov NOAA National Weather Service weather.gov Summary • Exceptionally strong pressure gradients drove the NE Winds • Weather Models predicted the wind event well • Topography and winds were perfectly aligned for downslope windstorm in NE/SW oriented steep drainage • Stability, pressure gradients, topography favored a “Hydraulic Jump” downslope windstorm • Jet Stream Touchdown very unlikely and not observed in Satellite or Model data NOAA National Weather Service weather.gov .

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