Mountain House

Every recorded tornado

1. Injuries and deaths are for the tornado’s whole path, which may extend beyond this area.
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.

Flood insurance figures are for San Joaquin County, the county that contains Mountain House.

Claims by ZIP code

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.

River crests

River gauges in San Joaquin County, the county that contains Mountain House.

River gauges

1. Crests are the highest and the recent crests the National Weather Service lists for each river gauge in the county that has a flood stage, not every flood. Flood categories use each gauge's current flood stages; crests from before levees, dams or channel changes may not be comparable. Crests measured on an old datum are left out of the rankings.

NOAA National Water Prediction Service gauge records, retrieved October 30, 2026.

The drought index is for San Joaquin County, the county that contains Mountain House.

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 city centre.
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.

Mapped landslides

Landslides mapped in San Joaquin County.

Mapped by USGS Earthquake-Triggered Ground Failure (2).

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. Jan 1, 2023Flood$107 million
   National Weather Service narrative

   San Joaquin County completed a preliminary estimate of damage from flooding. There was substantial flooding, with around $24.7million in individual assistance/private property loss including 172 properties destroyed and 194 properties with major damage. There was around $82 million in public damages. The estimated grand total as of January 26 was $106.9 million.

2. May 5, 1998Flash Flood$1.6 million
   National Weather Service narrative

   Extremely heavy rainfall, estimated at 3 to 5 inches in two hours, inundated 19 homes, 32 businesses, and 3 government buildings. The roofs of two buildings collapsed under the weight of the accumulated water; miraculously, no one was injured. The heaviest rainfall was observed between 330 pm and 400 pm.

3. Apr 1, 1996Thunderstorm Wind$1.0 million
   National Weather Service narrative

   A line of severe thunderstorms, associated with a bow echo indicated on the Sacramento WSR-88D at the time, produce straight-line damage in the San Joaquin River delta. Heaviest damage occurred to a boat marina (the source of the estimated value of damage). A local park also sustained damage in the form of 30 uprooted oak trees of more than 2 feet in diameter. On nearby Interstate 5, two tractor trailers were blown over on the highway, which runs north-south, by the strong westerly winds.

4. Apr 2, 2006Heavy Rain$650,000
   National Weather Service narrative

   Prolonged heavy precipitation with high snow levels resulted in excessive runoff into area river basins. Hardest hit was the San Joaquin River system and the Delta region. Many area reservoirs had minimal flood storage space as per seasonal norms and the large inflows had to be balanced very carefully with downstream releases to protect the fragile San Joaquin levee system. While the bulk of the flooding affected agricultural and rural properties, some local areas adjacent to waterways experienced flooding of homes and many roads were impassable. However, through the efforts of advance flood-fight measures, careful monitoring of levees, and critical water management coordination…

5. Feb 20, 2017Flash Flood$500,000
   National Weather Service narrative

   A levee breach 5-10 feet wide occurred along the San Joaquin River, 6 miles south of Lathrop. An evacuation was ordered by San Joaquin OES for south of Woodward Ave., west of Union Rd., and north of Mortensen. |Most of the areas affected are rural-agricultural areas.|As of approximately 21:00, the levee breach was plugged with rock and soil. Rip rap was applied on the waterside for wave wash protection. There were 10 structures were located near the inundation area.

6. Feb 9, 2017Flood$100,000
   National Weather Service narrative

   Flood waters were reported in several homes in Acampo.

7. Oct 30, 2008Heavy Rain$100,000
   National Weather Service narrative

   Rain caused damage to the Lodi Middle School administration building. The building was undergoing roof repairs, and a temporary tarp was in place. The tarp failed, allowing rain to enter the building and resulting in more than $100,000 damage.

8. Dec 26, 2005Tornado$20,000
   National Weather Service narrative

   A weak tornado damaged roof shingles and trees in a residential area in southern Tracy.

9. Apr 11, 2007Thunderstorm Wind$15,000
   National Weather Service narrative

   Minor damage to residential property and to plastic film coverings on multiple commercial greenhouses.

10. Apr 11, 2012Tornado$10,000
    National Weather Service narrative

    An EF0 tornado briefly touched down southwest of Stockton near French Camp. An outbuilding was destroyed but no injuries resulted.

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

112°F9 times, most recently Jul 7, 2024

All-time low

17°FDec 26, 1990

Warmest night

84°FAug 17, 2020

Coldest day

34°FJan 6, 1961

Wettest day

2.80 inJan 4, 1982

Hottest year

2014mean 66.3°F

Coldest year

1963mean 60.0°F

Wettest year

198328.19 in

Driest year

20134.28 in

Station Tracy Pumping Plt (USC00049001), 61 ft elevation, 2.7 miles from the city centre. Daily records from 1955 to October 26, 2026; 95.0% 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.

Declarations for San Joaquin County.

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.

• 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 USC00049001.
• 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.
• 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.