National Weather Service United States Department of Commerce

Thunderstorms in the Pacific Northwest and Great Lakes; Dangerous Heat Persists Across the South; Critical Fire Weather Concerns in the West

Scattered severe thunderstorms are possible in parts of Kentucky, the Ohio Valley and Pacific Northwest Saturday. Strong winds and hail are the primary hazards. Dangerous heat stress will persist through the weekend over parts of the Southern Plains and Lower Mississippi Valley. Dry and windy conditions will lead to critical fire weather concerns across portions of the Western U.S. this weekend. Read More >

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NWR Alabama Coverage

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NWR Coverage

 

 

USA MAP
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Coverage Map Notes

The coverage statistics and maps are calculated using a computer model and station data assuming ideal conditions. Coverage may be 5 to 10 percent below the computer predicted coverage for the following reasons:

  • The computer model is sensitive to antenna performance. Antenna performance is a function of local conditions, causing signals to be stronger signal level in some directions than others.
  • Placement of NWR antennas is dictated by the tower owner, which may result in a less than ideal set up.
  • The antenna may be affected by nearby structures or bodies of water.
  • In some special instances, the antenna may have been intentionally adjusted to be "directional" and provide better coverage to a specific area to the detriment of other areas.
  • Because of variations in local site conditions, the performance of an individual transmitter and antenna may be less than predicted or expected.
  • Seasonal environmental conditions, such as icing or heavy rain, affect performance of a transmitter station and its various components, particularly those subject to continuous weather exposure.
  • The coverage maps are shown in a single color format, which relates to an estimated signal level.
    • White: Signal level of greater than 18dBuV: Reliable coverage  
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