1 thunderstorm wind, as filed by the National Weather Service.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Salt Lake City, UT wrote its last area forecast discussion before the first event at Aug 20, 1:50 PM MST, 4 hours 10 minutes earlier.
UTAH AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SALT LAKE CITY UT 250 PM MDT MON AUG 20 2001 SYNOPSIS...MOIST AND UNSTABLE AIR WILL REMAIN OVER UTAH TONIGHT AND TUESDAY. BY WEDNESDAY THE AIR MASS OVER THE STATE WILL BE DRY AND STABLE. DISCUSSION...SHORTWAVE MOVING SLOWLY EAST ALONG UT/AZ BORDER. IT SHOULD KEEP QUITE A BIT OF CONVECTION GOING THROUGH THE EVENING OVER THE SOUTHEAST. WILL KEEP FLASH FLOOD WATCH GOING AS IS FOR THE EVENING. AT THE SAME TIME SOME SUPPRESSION EVIDENT OVER SOUTHWEST UT WHERE IT SHOULD BE FAIRLY QUITE THIS EVENING. OVER THE NORTH IT MAY GET MORE ACTIVE AS DIVERGENCE ALOFT IS FORECAST TO INCREASE OVER THE AREA THROUGH THIS EVENING. FAIRLY RAPID DEVELOPMENT OF CONVECTION JUST SOUTHWEST OF ENV MAY BE AN INDICATION OF THE DIVERGENCE STARTING TO DEVELOP. THIS IS ON THE FRINGE OF AN AREA THAT WOULD NORMALLY SHOW SOME DIURNAL DEVELOPMENT ABOUT NOW BUT TODAYS STRONGEST CELLS ARE LITTLE FARTHER NORTH AND EAST THAN WOULD USUALLY BE EXPECTED. 18Z ETA IS EVEN A LITTLE STRONGER ON THIS DIVERGENCE AND IF CORRECT MIGHT ALLOW SOME OF THE STORMS TO BECOME STRONG. WILL KEEP SCATTERED ACTIVITY OVER THE NORTH AND EAST FOR THIS EVENING WITH ONLY A SLIGHT CHANCE PLANNED FOR THE SOUTHWEST. BY TOMORROW THERE IS SOME DRYING BEGINNING OVER THE WEST BUT AGAIN THE 18Z ETA ISNT AS FAST ON THE DRYING...ESPECIALLY OVER THE SOUTHWEST. WE ALSO HAVE A LARGER SCALE TROF MOVING ACROSS THE GREAT BASIN AND AGAIN THERE IS CONSIDERABLE DIVERGENCE FORECAST OVER MUCH OF UT AT MIDDAY. THE NEW ETA ALSO PUTS -4 LIFTED INDICES AND CAPE VALUES AROUND 1500 OVER THE WASATCH FRONT AT MIDDAY TUE. WE WILL ONLY GO WITH SCATTERED ACTIVITY FOR NOW BUT WE MAY HAVE TO BEEF THAT UP IF THE LATEST MODEL TRENDS ARE RIGHT. WE MAY ALSO HAVE A HIGHER RISK OF SOME SEVERE WEATHER WITH THE INCREASED INSTABILITY... RELATIVELY HIGH CAPE VALUES AND PROXIMITY OF A WEAK JET. BUT ITS A LITTLE TOO EARLY TO REALLY HIT THAT IDEA HARD. BY WEDNESDAY STRONG DRYING IS EXPECTED ALTHOUGH THERE MAY STILL BE A LITTLE MOISTURE OVER THE EASTERN PART OF THE AREA. FOR THE REST OF THE EXTENDED PERIOD IT WILL PROBABLY REMAIN DRY. THERE IS A HINT IN THE MODELS OF SOME INCREASE IN MOISTURE OVER THE EXTREME EAST OVER THE WEEKEND BUT WE WONT ADDRESS THAT FOR NOW. WE SHOULD SEE NEAR SEASONAL TEMPERATURES THROUGH FRIDAY THEN WARM A FEW DEGREES OVER THE WEEKEND. SLC 333- CDC 233- SANDERS .SLC...FLASH FLOOD WATCH SOUTH CENTRAL UT UNTIL 0400Z.
The Salt Lake City radar (KMTX), 38 km away, was scanning. The volume nearest the first event began at 00:59 UTC.
1 thunderstorm wind. Local standard time, as filed.
Severe thunderstorms in Weber County brought a 70 mph (65 kts) wind gust to the city of Roy.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Utah in 2001Every state in 2001This day in weather historyWarnings in Utah, August 2001
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 5275349.