Isolated heavy rainfall will continue through tonight across portions of central Texas, though some relief from the heavy rain is expected on Tuesday. Heat and humidity will remain in place across the Eastern U.S. and interior Northwest U.S. over the next few days with widespread moderate to major Heat Risk. Dangerous heat will build into the Desert Southwest Tuesday through Thursday. Read More >
Spokane, WA
Weather Forecast Office
With abundant fog around this winter, the Inland Northwest has seen its share of rime development. These photos, depicting quite large growth of the frost was taken outside our office during the third week of January.
By definition, rime is a deposit of interlocking ice crystals formed by direct sublimation on objects, usually those of small diameter freely exposed to the air, such as tree branches.
The deposition of rime is different than the process in which frost is formed. In the case of rime, the object and the air are both below freezing and liquid drops (e.g. fog) must be present. For frost, the object itself must be below freezing but the air can be above freezing. Also, water vapor (not droplets) are the source of moisture, so frost forms on clear cold nights.
US Dept of Commerce
National Oceanic and Atmospheric Administration
National Weather Service
Spokane, WA
2601 N Rambo Rd.
Spokane, WA 99224
509-244-0110
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