$wfo=zse ..is.. set$cwsu= is NOT set NWS-Seattle CWSU
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VFR/IFR-SIERRA
 TURBULENCE-TANGO
 ICING-ZULU
 Convective SIGMETs
Any Convective SIGMET implies severe or greater turbulence, severe icing, and low-level wind shear conditions. HELP | CLIMATOLOGY
  • Convective SIGMET (valid for 2-hours & issued hourly at Hour+55)

  • Severe surface weather including:
    • surface winds greater than or equal to 50 knots
    • hail at the surface greater than or equal to 3/4 inches in diameter
    • tornadoes
current Convective SIGMETs