Hazardous Inflight Weather Advisory Service

Hazardous Inflight Weather Advisory Service (HIWAS[1]) is a continuous broadcast of hazardous weather information which is transmitted over selected VORs. This hazardous weather includes AIRMETs, SIGMETs, Convective SIGMETs, and urgent PIREPs.

The presence of HIWAS information on a VOR is indicated on a sectional or terminal area chart by an "H" in the upper-right corner of the box surrounding the NAVAID frequency.[2]

References

  1. ↑ "Order JO 7340.1Z: Contractions" (PDF). Federal Aviation Administration. March 15, 2007.
  2. ↑ Weather Theory
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