National Weather Service United States Department of Commerce

Snow Showers and Squalls for Great Lakes and Northern Plains; Critical Fire Weather for Southern California

Winter continues across most of the country with below normal temperatures and gusty winds. Snow showers and squalls will affect the Great Lakes and northern Plains as a couple of cold fronts cross these regions. Winds and dry weather will keep fire weather concerns at critical levels for Southern California through the end of the week. A powerful storm will affect Alaska with heavy snow and winds Read More >

 

 

 


Text of all SIGMETs Around Contiguous Western US

None Found
Description of Convective and Non-Convective SIGMETs

SIGMETs are Inflight Weather Advisories for Significant Meteorological hazards. A SIGMET is "widespread" in that it covers an area of at least 3,000 square miles. Note that the particular hazard may be present in only a small portion of the area at any particular time. SIGMETS are issued for:
  • Severe Icing (not associated with thunderstorms -- otherwise, it is a Convective SIGMET)
  • Severe Turbulence (similarly, only if not associated with thunderstorms)
  • Duststorms and sandstorms lowering visibility to less than three miles
  • Volcanic Ash

Convective SIGMETs are issued for severe convective activity, which implies severe turbulence, severe icing, and low-level wind shear. Specifically:
  • Embedded thunderstorms
  • A line of thunderstorms
  • Thunderstorms with heavy precipitation affecting 40%+ of an area at least 3,000 square miles
  • Surface winds 50+ knots due to severe thunderstorm
  • Hail 3/4+ inches in diameter
  • Tornadoes


Map of SIGMETs (including International)