Air Quality and Pollution
The valleys of the Wasatch Front of northern Utah experience their greatest concentrations of nitrogen oxides, carbon monoxide and particulates from November through February. Ozone reaches …
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Local knowledge. Wider perspective.
Utah, through
weather.
A place to understand our skies, explore our past, and make sense of a changing climate.
Explore our climate →Southern Utah, storm to sun AI-generated illustration
WEATHER & WATER
Your corner of Utah.
Local forecasts and trusted sources for the conditions that matter.
Find your forecast →THE WEATHER ALMANACSINCE 1847
Every day has a story.
Explore the events and observations in Utah’s historical weather collection.
Travel through weather history →A DAY TO REMEMBERSEPT 18, 2026
A tornado in
the Wasatch.
Farmington & Fruit Heights: the NWS report, eyewitness videos, and the story so far.
Explore the event →FOLLOW YOUR CURIOSITY
September21ON THIS DAY
FROM THE UTAH WEATHER ALMANAC
There’s history in the forecast.
In 1957, heavy rain washed out out numerous roads and flooded many homes in southern Utah. Buckskin Gulch and the Paria River were flooded. In 1962, a 50-year flood occurred in Fry Canyon near Hite. Rain in the Book Cliffs washed out a quarter mile of railroad tracks.
Read this day in weather history →Historical accounts and separately credited additions.
A PLACE TO START
The science behind our skies.
Allergies
Pollen Forecast for your area (via The Weather Channel) Pollen Count (via the Intermountain Allergy and Asthma Clinic)
Explore the articleAnnual Normal Precipitation
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PHOTO OF THE DAY · September 21
A wash becomes a flood
Flashflood near Devil’s Canyon at the Globe Copper Mine in Emery County, Utah, on August 26, 2006. The wash was completely dry before the photographer arrived –and this picture was taken thirty minutes after his/her arrival. Photograph by D&J (savy@etv.net); courtesy of ABC4-KTVX Television
D&J
Explore the photo collection →From the historical collection; the feature date is not the date the photograph was taken.FIND YOUR WAY INTO THE COLLECTION
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BUILT ON SHARED KNOWLEDGE
A changing climate. A growing conversation.
Our understanding grows through observation, evidence, and the people who ask good questions. UCCW brings local expertise together for everyone.
Built on local knowledge. Open to discovery.
A shared resource for students, educators, scientists, and everyone curious about Utah.
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