NHC HURDAT2 · SPC Tornado Database
Hurricanes and Tornadoes That Hit Riverton, UT
Every tropical system within 75 miles since 1851 and every tornado within 25 miles since 1950.
Data: NOAA NHC HURDAT2 and NOAA SPC tornado and hail reports, through 2025 · Updated
No tropical storm or hurricane has passed within 75 miles of Riverton, Utah since records began in 1851. Since 1950, 24 tornadoes have touched down within 25 miles, 0 of them rated EF3 or stronger.
- Hurricanes
- 0
- Tropical storms
- 0
- Tornadoes
- 24
- EF3 or stronger
- 0
within 75 mi, since 1851
below hurricane strength
within 25 mi, since 1950
1 deaths in all
What the records show for Riverton
The highest rating among the 24 tornadoes within 25 miles is F2, reached 2 times; the most recent, on August 11, 1999, came within 16 miles. Of the 24, none had a path within 5 miles of the city centre, and 4 have come since 2000. September has had the most tornadoes, 6. The most recent tornado was on September 2, 2021. Riverton has more tornadoes within 25 miles than 87% of the 99 Utah cities on this site. Hail has been reported within 10 miles 50 times since 1973, with stones up to 1.75 inches (golf ball size). Riverton has more hail reports within 10 miles than 89% of the 99 Utah cities.
Compare Riverton's storm record with another city →
Tornadoes within 25 miles of Riverton
By decade
- 2020s1
- 2010s1
- 2000s2
- 1990s10
- 1980s5
- 1970s2
- 1960s3
| Date | Rating | Distance | Path | Killed / injured |
|---|---|---|---|---|
| Aug 11, 1999 | F2 | 16 mi | 4.3 mi | 1 / 80 |
| Feb 9, 1965 | F2 | 17 mi | 0.1 mi | 0 / 0 |
| Sep 2, 2021 | EF1 | 25 mi | 2.05 mi | 0 / 0 |
| Jun 2, 1993 | F1 | 23 mi | 1 mi | 0 / 2 |
| May 3, 1993 | F1 | 19 mi | 0.1 mi | 0 / 0 |
| Jul 25, 1991 | F1 | 16 mi | 10 mi | 0 / 0 |
| Jul 8, 1989 | F1 | 7 mi | 0.2 mi | 0 / 0 |
| Mar 2, 1989 | F1 | 15 mi | 0.2 mi | 0 / 0 |
| Jan 10, 1989 | F1 | 7 mi | 0.2 mi | 0 / 0 |
| Dec 2, 1970 | F1 | 21 mi | 1 mi | 0 / 0 |
| Aug 14, 1968 | F1 | 19 mi | 0.1 mi | 0 / 0 |
| Jul 9, 1965 | F1 | 23 mi | 0.4 mi | 0 / 0 |
The strongest 12 of 24, by rating and then by deaths. Ratings before February 2007 are on the original Fujita scale.
Hail in Riverton
The Storm Prediction Center has 50 hail reports within 10 miles of Riverton since 1973, made on 41 separate days. Of these, 30 were 1 inch across or larger, and none reached 2 inches. The largest, 1.75 inches (golf ball size), fell on August 4, 1991. The most recent report is from August 13, 2024. August has the most reports, 25.
Source: NOAA Storm Prediction Center severe weather reports, data through 2025.
Weather by month in Riverton
The nearest NOAA station with 1991–2020 climate normals is Alpine, UT, 11 miles east of Riverton at 5,100 feet. July is the warmest, with an average high of 90°F and low of 59°F; January is the coolest, at 39°F and 22°F. January and April are the wettest at 2.5 inches of precipitation on average and July the driest at 0.6 inches; the year adds up to 21.0 inches over 55 days with at least a tenth of an inch. Highs reach 90°F on about 36 days a year, almost all from June to September. Lows fall below freezing on about 133 nights a year. Snowfall averages 74.4 inches a year, most of it in December. That 21.0 inches is more than at 46 of the 58 Utah stations used on this site (79%). South Jordan, 4 miles north, has its own station (Cottonwood Weir, UT): 24.4 inches a year, 3.4 more than here, and a July average high of 91°F against 90°F.
| Month | High °F | Low °F | Precip. in | Days ≥ 0.1" | Snow in |
|---|---|---|---|---|---|
| Jan | 39 | 22 | 2.5 | 7 | 17.4 |
| Feb | 44 | 25 | 2.0 | 6 | 13.6 |
| Mar | 54 | 32 | 2.0 | 6 | 9.6 |
| Apr | 61 | 37 | 2.5 | 7 | 6.2 |
| May | 71 | 44 | 2.4 | 6 | 0.5 |
| Jun | 82 | 51 | 1.0 | 2 | 0.0 |
| Jul | 90 | 59 | 0.6 | 2 | 0.0 |
| Aug | 87 | 58 | 1.0 | 3 | 0.0 |
| Sep | 79 | 49 | 1.3 | 3 | 0.0 |
| Oct | 65 | 39 | 1.8 | 4 | 1.6 |
| Nov | 50 | 29 | 1.6 | 5 | 8.0 |
| Dec | 39 | 22 | 2.3 | 6 | 17.5 |
| Year | 63 | 39 | 21.0 | 55 | 74.4 |
Averages for 1991–2020 at Alpine, UT (5,100 ft), from NOAA NCEI U.S. Climate Normals. Normals describe the station; the farther a place is from it, and the bigger the difference in height, the more its weather can differ.
Floods, thunderstorm wind and lightning near Riverton
Since 1996, the National Weather Service has logged 94 flood, rain, thunderstorm wind and lightning events that began within 10 miles of Riverton: 74 thunderstorm wind reports, 12 flash floods, 5 floods, 2 lightning strikes and 1 heavy rain event. They killed 1 person and injured 0, and the NWS estimated $18.2 million in property and crop damage. The strongest thunderstorm gust on record here was 90 mph, on July 3, 2023. August has had the most flash floods, 6 of 12. Of the 90 Utah cities on this site with a flash flood on record, 72 have had fewer than Riverton.
August 30, 2015: lightning strike 9 miles from the centre of Riverton — 1 killed.
August 3, 2023: flash flood 4 miles from the centre of Riverton — $16.0 million damage.
August 3, 2023: flash flood 6 miles from the centre of Riverton — $1.0 million damage.
Source: NOAA NCEI Storm Events Database, events whose starting point is on record, 1996 to June 30, 2026. Damage is the NWS estimate in the dollars of the year, not insured losses, and NWS notes that some reports are unverified.
Flood insurance claims, disaster declarations and FEMA risk ratings
Flood insurance policyholders in Riverton's ZIP code 84065 have filed 13 claims with the National Flood Insurance Program since 1979, and were paid $1,373 for buildings and contents, in the dollars of each year. Of the 23 Utah cities on this site with 10 or more claims, 5 have fewer than Riverton.
Salt Lake County, which includes Riverton, has been named in 12 federal disaster or emergency declarations since 1983, 7 of them major disasters (by incident: 3 fires, 3 floods, 2 biological emergencies, 1 coastal storm). The latest major disaster declaration was Straight-Line Winds, on January 12, 2021. FEMA's National Risk Index gives Salt Lake County a Relatively High rating for natural hazard risk overall; by hazard: Relatively High for lightning; Relatively Moderate for tornadoes, inland flooding, strong wind and heat waves; Relatively Low for hail. It models the county's expected loss from all 18 hazards it covers at $621.7 million a year, the highest of 29 Utah counties; of the hazards above, the largest share, $79.3 million (13%), is from inland flooding.
Claims: FEMA, OpenFEMA Dataset FIMA NFIP Redacted Claims – v3, summed over ZIP codes; payments in the dollars of each year, not adjusted for inflation. Declarations: Disaster Declarations Summaries – v2, by county. Retrieved October 25, 2026. This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Risk ratings: FEMA, National Risk Index county table, December 2025 (v1.20), retrieved October 26, 2026; ratings compare counties nationwide, are meant for planning and are no substitute for a local risk assessment. This product uses the Federal Emergency Management Agency's National Risk Index dataset API or downloadable datasets but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
What counts as a pass, the distances and the sources: how this storm history is built.