National Weather Service United States Department of Commerce

Dangerous Heat Across The Southern U.S. And Severe Thunderstorms In The Plains and Upper Midwest

After a sweltering weekend, heat advisories and excessive heat warnings continue across the southern tier of the U.S. with the potential for more record high temperatures and very dangerous heat indices. Also, severe thunderstorms with all hazards, including tornadoes, hail, damaging winds and heavy rain, are expected this afternoon and evening from the Upper Midwest to the central High Plains. Read More >

NWR Specific Area Message Encoding (SAME)

 

Detailed SAME System Specification (pdf file)

You need the free Adobe Acrobat Reader to read pdf files.


Explanation of NWR and SAME

NWR service to a county depends on reliable signal reception, which typically extends in about a 40 mile radius from the transmitter, assuming level terrain. Counties without NWR coverage or partial NWR coverage are indicated. Some counties or parts of counties, especially in mountainous areas, may not have reliable reception due to signal blockages or excessive distance from the transmitter.