National Weather Service (NWS) is responsible for monitoring ice breakup conditions throughout Alaska to assess flood
threats and navigational hazards. Ground observations, aerial reconnaissance, and remote sensing are sources used to assess ice
conditions. Although ice jam flooding is most common during the ice breakup season, ice condition reports are welcome during
freezeup and mid-winter as well.
We have relied for many years on observations of Alaska village residents describing the river ice condition in front of the
village. Supplemental aerial observations from aircraft flying at low to mid-level altitudes have significantly enhanced the
information on ice conditions. Since ice conditions can vary significantly along a river and can change rapidly
during the breakup process, numerous observations are needed statewide to assess the status of breakup. It must be stressed
that we are looking for reliable and objective reports.
The River Watch Program is a voluntary program that is...
- Asking pilots and village residents to provide reports of river ice conditions
- Requesting pilot observations that can be obtained without deviation from the normal route or flight level
- Stressing that river ice observations only be taken when it can be done safely
- Serving the purpose to assist the NWS in providing accurate forecasts, warnings, and navigation information
River and lake ice observations can be provided to the Alaska-Pacific River Forecast Center (APRFC) via :
- radio from aircraft to AFSS with observations for inclusion in a PIREP
- phone at 1-800-847-1739
- email report and/or photos using link on this page
- fill out web form using link on this page
Submit an ice condition report
Additional information about the program and tools to download are available at the following links:
Email us about this program:
Many thanks to the FSS, other partner agencies, commercial and private pilots, and village residents for their
river ice observations during the ice breakup seasons.