Jerome County

Every recorded tornado

1. Injuries and deaths are for the tornado’s whole path, which may extend beyond the county. Deaths recorded within Jerome County: 0.
2. Weak tornadoes were under-recorded before Doppler radar coverage became national in the early 1990s, so earlier decades read low. Ratings use the Fujita scale before February 2007 and the Enhanced Fujita scale after.

Storm Prediction Center severe weather database, 1950 to 2025.

Every large fire

1. Large fires mapped by the Monitoring Trends in Burn Severity program since 1984: 1,000 acres or more in the West, 500 or more in the East. Prescribed burns are excluded. Acres here are the part of each perimeter inside this place.

Monitoring Trends in Burn Severity (USGS and U.S. Forest Service), 1984 to 2026.

Smoke overhead

1. A smoke day is a date on which a smoke plume traced by NOAA Hazard Mapping System analysts from satellite imagery covered this place's point (the county's population centre or the city centre). Counts here are of medium or heavy smoke. Since 2018 analysts have often drawn light smoke as one area over most of the continent, so light-smoke counts are not comparable from year to year. The plumes show smoke anywhere in the air above, not air quality at the ground, and smoke hidden by cloud is missed.

NOAA Hazard Mapping System smoke analysis, 2011 to 2026, retrieved October 30, 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).

OpenFEMA NFIP Redacted Claims v3, refreshed August 4, 2026. NOAA Storm Events through 2026.

1. The Palmer Drought Severity Index is computed by NOAA each month from the county's average temperature and precipitation, relative to the county's own climate. Zero is normal; -3 or lower is severe drought and -4 or lower extreme drought. It describes the long-term balance of moisture, not water supply or crop losses.

NOAA NCEI nClimDiv county Palmer Drought Severity Index, 1895 to September 2026, issued October 6, 2026.

Every earthquake of magnitude 4 or more within 50 miles

1. Earthquakes of magnitude 2.5 or more in the USGS Comprehensive Catalog since 1900. Within 50 miles means the epicentre lies within 50 miles of the county boundary (or inside the county).
2. Small earthquakes were under-recorded before the modern seismic networks of the 1970s and are still missed in remote areas, so early decades read low. Magnitudes are as the catalogue reports them and mix scales (moment, local and body-wave).

USGS ANSS Comprehensive Earthquake Catalog, 1900 to present, retrieved October 30, 2026.

Volcanoes within 100 miles

1. U.S. volcanoes within 100 miles, from the USGS Volcano Hazards Program. The threat category is the USGS 2018 National Volcanic Threat Assessment, which ranks volcanoes by how hazardous their past eruptions were and how many people and how much infrastructure lie near them. It is not a forecast of eruption.

USGS Volcano Hazards Program, retrieved October 30, 2026.

Mapped landslides

Mapped by NASA (1).

1. Landslides mapped in the USGS compilation of landslide inventories across the United States (version 3.0, 2025), rated probable or better. The compilation joins inventories made by federal and state agencies for different purposes and areas, so the number mapped in a county reflects how closely it has been surveyed as much as how often its slopes fail. An area with few records may simply not have been mapped. Deaths are as recorded in the inventories; a slide listed in two inventories is counted once.

USGS Landslide Inventories across the United States, version 3.0, retrieved October 27, 2026.

More event types since 1996

Costliest events since 1996

1. Jun 1, 1997Flood, Western Magic Valley$50.0 million
   National Weather Service narrative

   During the month of June the spring melt of near record snowpack in Idaho's mountains caused extensive flooding along the Snake River and many of it's tributaries. The highest river flows in nearly 70 years were noted along the Middle Snake River, with numerous gages setting new record stages. The flood inundated lowlands along a 225 mile stretch of the river. Damage was extensive to irrigation canals, roads including interstate 15, levees, farmland and homes.Ten counties were declared local disaster areas. Estimates indicate that over 1,000 people were evacuated, and 250 to 300 homes were flooded. Over 50,000 acres were inundated and 26 irrigation canals were severely damaged. A…

2. Feb 8, 2017Flood$2.8 million
   National Weather Service narrative

   Rainfall and rapid melting of low elevation snowpack on top of frozen and saturated soil led to widespread flooding. Many roads around Jerome were damaged and closed due to flood waters. Widespread flooding of agricultural lands occurred.

3. Mar 29, 2009High Wind, Western Magic Valley$100,000
   National Weather Service narrative

   The ITD site at Hansen Bridge in Twin Falls reported a peak gust of 64 MPH and winds over 50 MPH were reported around the area throughout the day.

4. Feb 17, 1999High Wind, Western Magic Valley$50,000
   National Weather Service narrative

   A strong cold front swept through the Western Magic Valley with winds clocked to 62 mph at the Twin Falls Airport. The strong winds toppled two sixty foot tall pine trees and destroyed the roof of a barn near Buhl. In Twin Falls the roof of a school was damaged and a manufactured home was blown over.

5. Apr 9, 1999High Wind, Western Magic Valley$15,000
   National Weather Service narrative

   High winds blew across the Western Magic Valley. At Twin Falls a peak gust of 52 mph was measured and at Jerome sustained winds of 49 mph with a gust to 59 mph were observed. The winds overturned a truck near Twin Falls, caused power outages and damaged a warehouse roof.

1. Storm Events records before 1996 cover only tornadoes, thunderstorm wind and hail. Damage figures are as reported by the National Weather Service at the time, not adjusted for inflation.

NOAA NCEI Storm Events Database, 1950 to 2026, issued October 26, 2026.

All-time high

110°F2 times, most recently Jul 24, 2003

All-time low

−25°FJan 21, 1937

Warmest night

77°FJun 14, 2021

Coldest day

−3°FDec 22, 1990

Wettest day

2.00 inJan 4, 2022

Snowiest day

8.0 inFeb 2, 1916

Hottest year

1934mean 55.1°F

Coldest year

1985mean 44.9°F

Wettest year

199517.98 in

Driest year

20223.91 in

Snowiest season

53.1 in1948-49

Station Jerome (USC00104670), 3,740 ft elevation, 3.6 miles from the population centre. Daily records from 1915 to October 26, 2026; 87.2% of days in the last 30 years are complete. Records at a single station can differ from a city’s official threaded record, which may combine several stations.

NOAA NCEI Global Historical Climatology Network Daily.

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).

OpenFEMA Disaster Declarations Summaries, retrieved October 30, 2026. Statewide declarations are not listed.

Neighbouring counties

• Tornadoes NOAA Storm Prediction Center severe weather database, through 2025.
• Tropical cyclones NOAA National Hurricane Center HURDAT2 (Atlantic; Northeast and Central Pacific), through 2025.
• Wildfire USGS/USFS Monitoring Trends in Burn Severity, through 2026.
• Storm events NOAA NCEI Storm Events Database, through 2026.
• Flood insurance OpenFEMA NFIP Redacted Claims v3, refreshed August 4, 2026.
• Declarations OpenFEMA Disaster Declarations Summaries v2, retrieved October 30, 2026.
• Weather records NOAA NCEI Global Historical Climatology Network Daily, station USC00104670.
• River crests NOAA National Weather Service, National Water Prediction Service river gauges, retrieved October 30, 2026.
• Drought NOAA NCEI nClimDiv county Palmer Drought Severity Index, through September 2026.
• Smoke NOAA NESDIS Hazard Mapping System smoke analysis, retrieved October 30, 2026.
• Volcanoes USGS Volcano Hazards Program, U.S. volcanoes and 2018 threat assessment.
• Landslides USGS Landslide Inventories across the United States, version 3.0 (2025).
• Earthquakes USGS ANSS Comprehensive Earthquake Catalog (ComCat), retrieved October 30, 2026.

Joins, thresholds and known limits are set out in the methodology. Found an error? Report it. Page built October 30, 2026.