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
September20ON THIS DAY
FROM THE UTAH WEATHER ALMANAC
There’s history in the forecast.
In 1962, flash floods marooned a school bus between Bluff and Mexican Hat on Utah Highway 47. Flash floods on Salt Lake City's east bench flooded basements. Two feet of water accumulated in some intersections. More than 1 inch of rain was reported in 15 minutes.
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 20
Lightning over Lehi
Lightning hits Lehi, Utah, on June 9, 2006, 10:15 PM Photograph by Trevor Hansen; courtesy of ABC4-KTVX Television
Trevor Hansen
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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