... Dense fog advisory now in effect until 8 am MDT Monday...
* visibilities... one quarter or less at times.
* Timing... dense fog to be found across Mountain Pass level
through the afternoon and evening hours. Widespread dense fog is
then expected to develop tonight into early Monday morning,
including in the Helena valley.
* Impacts... limited visibilities will make travel difficult.
A dense fog advisory means visibilities will frequently be
reduced to less than one quarter mile. If driving, slow down, use
your low beam headlights, and leave plenty of distance ahead of
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Dense Fog Advisory
Issued: 2:55 PM MDT Mar. 24, 2019 – National Weather Service