National Weather Service United States Department of Commerce

Major Heat Wave Out West; Flash Flooding in the Mid-Atlantic

A major heat wave will consume much of the Western U.S. over the next week with dangerously hot temperatures. Widespread excessive heat warnings and heat advisories are currently in effect. Also, low humidity and dry thunderstorm potential are adding to the fire danger across the Great Basin and Northwest. Meanwhile, a system is producing heavy rain and flash flood concerns in the Mid-Atlantic. Read More >

 

 
Icing - AIRMET ZULU (12-hour period)
  • Moderate Icing
Turbulence - AIRMET TANGO (12-hour period)
  • Moderate Turbulence HIGH level (>FL180)
  • Moderate Turbulence LOW level (sfc-FL180)
  • Low Level Wind Shear (LLWS) below 2000 feet AGL
  • Sustained surface winds of 30 knots or more at the surface
Instrument Flight Rules (IFR) or Mountain Obscuration - AIRMET SIERRA (12-hour period)
  • Ceilings less than 1000 feet and/or visibility less than 3 miles affecting over 50% of the area at one time.
  • Extensive mountain obscuration
Icing - FREEZING LEVEL (12-hour period)
  • Lowest Freezing Levels
  • Multiple Freezing Levels

 

Please note that SIGMETs are not included in the graphics below.

 

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