The National Weather Service in Riverton has issued a
* hydrologic advisory for...
an ice jam in...
central Big Horn County in central Wyoming...
* until 930 am MST Sunday
* at 836 am MST, Big Horn County emergency management reported there
were still a large ice jam along the Big Horn river that may cause
additional flooding. One ice jam was between basin and Greybull.
This ice jam has moved downstream about an half mile since
Thursday night. The other major ice jam that was located
downstream of Greybull near the Sheep Mountain area has broken up
and moved downstream.
* There are also 2 smaller ice jams that are just upstream and
downstream of Greybull. These jams are not causing any significant
flooding in and around Greybull. The Big Horn river at Greybull
was reported at 85.62 feet at 7:00 am MST this morning. Flood
stage is 92.0 feet.
* Colder temperatures through early next week should inhibit any
significant movement of current ice jams. There also should be no
significant additional ice accumulation on the Big Horn river with
the expected temperatures through early next week.
River ice is very unpredictable, and may move and jam with little
notice. Any ice jam can cause flooding, as the ice dams the river,
causing rapid increases in river levels in a short period of time.
People living near the Big Horn river should monitor the situation
closely and be ready to move to higher ground if flooding occurs.
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