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 Sep 12, 1:30 PM MST, 4 hours earlier.
UTAH AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SALT LAKE CITY UT 230 PM MDT WED SEP 12 2001 SYNOPSIS...AN UPPER LEVEL LOW WILL MOVE ACROSS NORTHERN NEVADA AND SOUTHERN IDAHO TONIGHT AND THURSDAY. THE AIR MASS WILL BECOME MORE MOIST AND UNSTABLE AS THIS SYSTEM MOVES INTO THE AREA. DRIER AIR WILL START MOVING INTO THE WESTERN PORTION OF THE AREA LATE THURSDAY. DISCUSSION...UPPER LEVEL LOW OVER NORTHERN CA WILL TRACK ACROSS NORTHERN NV AND SOUTHERN ID OVER THE NEXT 36HRS. SHORTWAVE ROTATING AROUND THE BOTTOM OF THE LOW WILL MOSTLY MISS OUR AREA BUT COULD CLIP THE EXTREME NORTHWEST AS IT GOES BY. SO DYNAMICS ARENT GREAT FOR MOST OF THE AREA. BUT THERE HAS BEEN A WELL DEFINED BAND OF SHOWERS AND THUNDERSTORMS ON THE LEADING EDGE OF THIS SYSTEM. ITS BEST SUPPORT IS PROBABLY FROM HIGH LEVEL DIVERGENCE AND THAT ALSO TENDS TO BE BETTER NORTH OF OUR AREA BUT THERE IS STILL SOME DIVERGENCE OVER MOST OF UT TONIGHT INTO THURSDAY. SO EXPECT THE BAND TO CONTINUE SLOWLY EAST...REACHING THE WASATCH FRONT ABOUT MIDNIGHT. THERE SHOULD BE WIDESPREAD BUT MOSTLY LIGHT SHOWERS OVER THE NORTHERN HALF OF THE AREA WITH A LITTLE MORE SCATTERED ACTIVITY OVER THE SOUTH. DONT EXPECT AS MUCH NOCTURNAL LIGHTNING AS IT HAD OVER NV LAST NIGHT BECAUSE OF THE WEAKER DIVERGENCE ALOFT BUT THERE MAY STILL BE A FEW THUNDERSTORMS IN THE WEE HOURS. THE MAIN BAND WILL BE OVER THE EASTERN PART OF THE AREA THURSDAY MORNING BUT THERE SHOULD BE ENOUGH MOISTURE LEFT IN THE WEST FOR SCATTERED DIURNAL CONVECTION IN THE AFTERNOON. A DRY SLOT STARTS WORKING ACROSS THE CENTRAL PORTION OF UT FROM THE WEST DURING THE AFTERNOON AND THAT DRYING CONTINUES INTO THE WEEKEND. HOWEVER SOME MOISTURE REMAINS ALONG BOTH THE NORTHERN AND SOUTHERN BORDERS OF THE STATE FOR A SLIGHT CHANCE OF CONVECTION STILL ON FRIDAY. THE NORTH DRYS BY SATURDAY BUT OVER THE EXTREME SOUTH LOWER LEVEL MOISTURE IS FORECAST TO INCREASE A LITTLE AGAIN. THIS LOOKS LIKE IT ORIGINATES FROM THE AREA AROUND TROPICAL STORM IVO. THE FLOW AT HIGHER LEVELS IS SO WESTERLY OVER UT AND EVEN NORTHERN AZ THAT IT MAY BE HARD TO BRING THIS MOISTURE SO FAR NORTH. HOWEVER WE WILL LEAVE A CHANCE OF CONVECTION IN THE SOUTHERN MOUNTAINS AND EXTREME SOUTHERN VALLEYS FOR SATURDAY. IN THE EXTENDED THE FLOW STAYS MOSTLY WESTERLY. STILL QUITE A BIT OF DISAGREEMENT ABOUT THE NATURE AND TIMING OF THE NEXT SHORTWAVE COMING OUT OF THE PACIFIC. THE EUROPEAN MODELS HAVE BE SLOWER AND MORE CLOSED OFF WITH THE FEATURE WHILE THE MRF/AVN RACE IT ACROSS THE NORTHERN ROCKIES. THE 12Z UKMET IS LOOKING MORE LIKE THE 12Z AVN WHICH HAD SHIFTED TO A SLIGHTLY SLOWER MOVEMENT THAN THE MRF. SO WILL USE THE MRF IDEA WITH JUST A SLIGHTLY SLOWER MOVEMENT. THIS COULD STILL LET THE IMPULSE BRUSH THE EXTREME NORTHERN EDGE OF THE AREA. WILL KEEP THE SLIGHT CHANCE IN THE NORTHERN TWO MOUNTAIN ZONES BUT DROP IT IN THE CENTRAL PART OF THE STATE. THE MOISTURE ALONG THE UT/AZ BORDER IS FORECAST TO REMAIN THROUGH ABOUT MON SO WILL KEEP A CHANCE OF SHOWERS FOR THAT AREA. BY TUE/WED WE SHOULD JUST BE IN A DRY WESTERLY FLOW WITH SEASONAL TEMPERATURES. SLC 743- CDC 43-1 SANDERS .SLC...NONE.
The Salt Lake City radar (KMTX), 135 km away, was scanning. The volume nearest the first event began at 00:32 UTC.
1 thunderstorm wind. Local standard time, as filed.
Severe thunderstorms produced wind gusts to 60 mph (52 kts) at Hat Island, Gunnison Island, and Vernon Hill.
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, September 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: 5275425.