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High wind warning HWW – Strong sustained winds of 40 to 73 miles per hour (64 to 117 km/h) for one hour or longer, or wind gusts of 58 miles per hour (93 km/h) or greater for any duration that are not associated with thunderstorms are occurring or will occur within six to 12 hours. Wind speeds may pose a hazard to pedestrian and vehicular ...
In Canada, a severe thunderstorm is defined as having wind gusts of greater than 90 km/h (56 mph), hail with a diameter of greater than two centimetres (0.79 in), rainfall rates of greater than 50 millimetres (2.0 in) in one hour or greater than 75 millimetres (3.0 in) in three hours, or tornadoes. [14]
On December 19, 2017, and August 3, 2018, the National Weather Service Weather Forecast Office in Reno, Nevada, issued PDS red flag warnings to highlight the threat for potentially life-threatening fire danger due to strong gusty winds and low humidity.
See Severe weather terminology (United States) and/or Severe weather terminology (Canada) for comprehensive articles concerning specific nations' warnings, watches, advisories and related terms. Pages in category "Weather warnings and advisories"
Red flag warnings are in place for Southern California due to Santa Ana winds that will bring gusts up to 65 mph and “extremely rare and dangerous” fire weather conditions.
Severe weather in the form of strong straight-line winds can be expected in areas where the squall line forms a bow echo, in the farthest portion of the bow. [38] Tornadoes can be found along waves within a line echo wave pattern (LEWP) where mesoscale low-pressure areas are present. [ 39 ]
A weather warning generally refers to an alert issued by a meteorological agency to warn citizens of approaching dangerous weather.A weather watch, on the other hand, typically refers to an alert issued to indicate that conditions are favorable for the development of dangerous weather patterns, although the dangerous weather conditions themselves are not currently present.
Strong Wind (Small Craft) Warning – Issued if winds of 20 to 33 kn (37 to 61 km/h) are forecast. Gale Warning – Issued if winds of 34 to 47 kn (63 to 87 km/h) are forecast. Storm Warning – Issued if winds of 48 to 63 kn (89 to 117 km/h) are forecast. Hurricane Force Wind Warning – Issued for winds of 64 kn (119 km/h) or greater.