National Weather Service United States Department of Commerce

Strong to Severe Storms in the Northern and Central High Plains; Very Hot Temperatures in South Texas and Florida

Scattered strong to severe thunderstorms capable of producing severe winds and hail are likely to develop this afternoon in the northern and central High Plains. Isolated large hail and heavy rainfall will also be possible in southwest Texas. The combination of high surface temperatures and high humidity will lead to heat index values up to 110 degrees in portions of south Texas and Florida. 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)