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Map of regions covered by the 122 Weather Forecast Offices. The National Weather Service operates 122 weather forecast offices. [1] [2] Each weather forecast office (WFO or NWSFO) has a geographic area of responsibility, also known as a county warning area, for issuing local public, marine, aviation, fire, and hydrology forecasts.
An example of weather alerts on a national map from the National Weather Service. The NWS divides severe weather alerts into several types of hazardous/hydrologic events: Severe local storms – Short-fused, small-scale hazardous weather or hydrologic events produced by thunderstorms (including large hail, damaging winds, tornadoes, and flash ...
The outlook included a 45% significant tornado area that was introduced at 1630Z (the first instance of a 45% area being added prior to the 20Z outlook), which is above the minimum threshold for a high risk. It also produced the first known watch (PDS tornado watch 235) with a >95% probability for all severe and significant severe hazards. [274]
The PDS red flag warning below was issued by the National Weather Service in Reno, Nevada, on December 19, 2017. [9] On August 3, 2018, the National Weather Service in Reno, Nevada, issued another PDS red flag warning to communicate the threat of life-threatening fire danger due to strong gusty winds and low humidity.
The current National Weather Service Chicago is located in Romeoville and is in charge of issuing local forecasts and weather warnings for the Chicago area. [2] It is one of only two National Weather Service offices in Illinois, the other being National Weather Service Central Illinois in Lincoln, Illinois.
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]
NOAA has released its seasonal outlook for the 2024-25 winter months, which predicts the U.S. will slowly transition into a La Niña pattern. Maps show NOAA's winter outlook Skip to main content
New York City police and Office of Emergency Management vehicles parked near Times Square in New York City during a 2015 blizzard warning.. A blizzard warning (SAME code: BZW) is a hazardous weather statement issued by Weather Forecast Offices (WFO) of the National Weather Service (NWS) in the United States, which indicates heavy snowfall accompanied by sustained winds or frequent gusts of 35 ...