National Weather Service United States Department of Commerce

Seattle, WA

Center Weather Service Unit

Seattle Center Weather Service Unit       


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 these graphics. Please refer to SIGMETs for those graphics.


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