Isanti County

Every recorded tornado

1. Injuries and deaths are for the tornado’s whole path, which may extend beyond the county. Deaths recorded within Isanti 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.

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.

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.

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.

Mapped landslides

Mapped by USGS MN (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. Jul 18, 2020Thunderstorm Wind$250,000
   National Weather Service narrative

   A NWS Storm Survey indicated that numerous trees were blown down across north central and northeast Isanti County. The damage was in a swath about two miles wide. The hardest hit areas were west of Stanchfield, through the town, and to the east of Stanchfield. Several large sheds were also damaged in this area.

2. Jun 18, 2001Tornado$200,000
   National Weather Service narrative

   NWS damage survey indicated tornado trekked from 2 miles E of Day to the northeastern corner of Braham, exiting Isanti county at 1835 CST, and then headed into Kanabec county. Two barns were brought down, a dozen outbuildings damaged. Trees toppled, a few sheds were smashed, and siding was ripped off houses in the northwestern side of Braham.

3. Jul 1, 1997Flash Flood$100,000
   National Weather Service narrative

   Estimate of four inches of rain in less than one hour. Major damage to wastewater treatment facility under construction.

4. May 30, 2022Thunderstorm Wind$100,000
   National Weather Service narrative

   In addition to a trained spotter measured wind speed of 63 MPH east of Cambridge, several large trees were blown over at the Pine Village Mobile Home Park in Cambridge.

5. Jun 18, 2001Hail$50,000
   National Weather Service narrative

   Numerous cars, windows, roofs and siding damaged.

6. Jul 17, 2001Thunderstorm Wind$50,000
   National Weather Service narrative

   Bleachers blown over. Portion of Walmart greenhouse ripped off and destroyed.

7. Aug 26, 2018Hail$50,000
   National Weather Service narrative

   A swath of large hail, up to golf ball size, continued into Isanti County from west of Day, to the far northeast corner near Braham. Vehicles were reported damage from the hail stones.

8. May 30, 2022Thunderstorm Wind$50,000
   National Weather Service narrative

   Several trees blew down near Braham, including damage to an outbuilding.

9. Aug 12, 2002Thunderstorm Wind$50,000
10. Jul 30, 2011Tornado$50,000
    National Weather Service narrative

    An EF-0 tornado continued southeast across northwest Isanti County, before turning directly south along County Road 58 west of Dalbo, and north of Carmody, Minnesota. The tornado ended less than a half mile north of South Stanchfield Lake. The most intense damage occurred along County Road 58 where concentrated tree damage was present, along with a resident garage which was shifted off its foundation. Another resident had small structure damage to shingles or roof damage. Two trailers at this residences slid a short distance, while one of the trailers flipped over. Maximum wind speeds were 70 to 80 mph along with a path length of approximately 5 miles.

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

105°FJul 16, 2006

All-time low

−44°FJan 14, 1965

Warmest night

78°F4 times, most recently Jul 18, 2011

Coldest day

−21°FJan 20, 1985

Wettest day

7.83 inOct 5, 2005

Snowiest day

17.0 in2 times, most recently Apr 17, 2014

Hottest year

2024mean 47.2°F

Coldest year

1951mean 38.3°F

Wettest year

196845.08 in

Driest year

197618.77 in

Snowiest season

83.3 in2022-23

Station Grantsburg (USW00014995), 990 ft elevation, 31.8 miles from the population centre. Daily records from 1950 to March 31, 2026; 96.2% 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 USW00014995.
• 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.