Terrell County

Population 702 (2025) 2,358 sq mi

Large wildfires have burned 54,274 acres of Terrell County since 1984, 52nd most of 254 counties in Texas; the largest was the Porter Fire in 2008.

Hazard fingerprint for Terrell County Tornado: 10th percentile. Tropical: 42th percentile. Wildfire: 58th percentile. Flood: 17th percentile. Hail & wind: 7th percentile. Heat: 0th percentile. Cold: 0th percentile. Winter: 5th percentile. TORTROPFIREFLOODSEVEREHEATCOLDWINTER

Hazard fingerprint Each spoke is this county’s percentile among U.S. counties where that hazard occurs. How it is computed

2026
  • Tornado damage paths since 195010
  • Tropical cyclone tracks within 100 miles since 1851, wider where stronger5
  • Wildfire burn scars since 19846

At a glance

The record for Terrell County in eight numbers. Each links to its section below.

Acres burned since 1984

54,274

52nd of 254 in Texas

6 large fires; the largest was Porter, 2008

Details

Tropical cyclones within 50 mi

4

112th of 254 in Texas

None at hurricane strength since 1851

Details

Flood insurance claims

3

185th of 254 in Texas

$5,159 paid since 1978

Details

Tornadoes since 1950

10

232nd of 254 in Texas

Fewer than the typical Texas county, which has had 35

Details

Strongest tornado

F3

September 21, 1965, 10.0 mile path

Strongest tropical cyclone

TS

Tropical storm (unnamed), 1929, 0.0 miles away

Largest earthquake within 50 mi

5.7magnitude

April 13, 1995, 46.5 miles away

Details

Federal disaster declarations

16

Most recent: Flooding, 2026

Details

Tornadoes

About one every 7.6 years since 1950, 2 of them rated F3/EF3 or stronger.

Strongest

September 21, 1965

F3, 10.0 mile path

10 yards wide.

Most recent

Sunday, June 2, 2024

EF1, 0.4 mile path

2 years ago.

Tornadoes by decade Doppler radar era² 1950s: 0 1960s: 2 2 1970s: 0 1980s: 0 1990s: 3 3 2000s: 1 1 2010s: 1 1 2020s: 3 3 1950s1960s1970s1980s1990s2000s2010s2020s
Recorded tornadoes per decade. The 2020s are incomplete.
Tornadoes by month J: 0 F: 0 M: 0 A: 2 M: 1 J: 4 4 J: 0 A: 1 S: 1 O: 1 N: 0 D: 0 JFMAMJJASOND
By month of occurrence, all years.

Every recorded tornado

Tornadoes in Terrell County since 1950
Jun 2, 2024EF10.45000
Jun 2, 2024EF30.9250120
Jun 2, 2023EFU21.220000
Apr 21, 2011EF27.880000
Apr 29, 2009EF20.330000
May 25, 1995F10.45000
Oct 12, 1993F00.11300
Jun 1, 1992F18.05000
Sep 21, 1965F310.01000
Aug 10, 1965F20.51000
  1. Injuries and deaths are for the tornado’s whole path, which may extend beyond the county. Deaths recorded within Terrell 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.

Hurricanes and tropical storms

4 passed within 50 miles since 1851; none at hurricane strength.

Strongest within 50 miles

June 29, 1929

Unnamed storm, Tropical storm

0.0 miles at closest approach, winds near 55 mph.

Most recent

July 16, 2003

Claudette, Tropical storm

41.3 miles at closest approach.

Tropical cyclones within 50 miles by decade 50s: 0 60s: 0 70s: 0 80s: 0 90s: 0 00s: 0 10s: 0 20s: 1 1 30s: 0 40s: 1 50s: 0 60s: 0 70s: 1 80s: 0 90s: 0 00s: 1 10s: 0 20s: 0 50s60s70s80s90s00s10s20s30s40s50s60s70s80s90s00s10s20s
Storms within 50 miles, by decade. Records before about 1900 miss storms that never reached land or ships.

Every storm within 100 miles

Tropical cyclones within 100 miles
Claudette200341.3Tropical storm40Category 1
Celia19704.3Tropical storm39Category 4
Unnamed194230.2Tropical storm46Category 3
Unnamed19290.0Tropical storm55Category 1
Unnamed185189.5Tropical storm46Category 1
  1. Tropical storms and hurricanes (34 kt or more, still tropical) at closest approach. Post-tropical remnants with gale-force winds are listed but not counted. Direct: track within 50 miles; near: within 100 miles. Distance is measured to the county boundary for counties and to the city centre for cities, using positions interpolated hourly between HURDAT2 fixes.

National Hurricane Center HURDAT2, 1851 to 2025.

Wildfire and smoke

54,274 acres burned in 6 large fires since 1984, equal to 3.6% of the land.

Largest

March 14, 2008

Porter Fire, 47,619 acres

39,548 acres inside Terrell County.

Most recent

March 1, 2020

Longfellow Nine Mile Complex

5,790 acres in total.

Acres burned since 1984, cumulative 2008: 40,9942011: 13,2692020: 12 54,274 acres 198519901995200020052010201520202025
Running total of acres burned inside the county (line) and each year’s acres (bars).

Every large fire

Large wildfires since 1984
Longfellow Nine Mile Complex2020115,790
Dhr20112,90221,369
Little Smokey20118,28319,865
Sanderson20112,0832,085
Huckabee20081,44584,968
Porter200839,54847,619
  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

Smokiest year

2021: 15 days

Heavy smoke on 4 days in 2020, the most of any year.

Last 10 years

5.1 days a year

Medium or heavy smoke, 2016 to 2025.

2025

3 days

Medium or heavy smoke. 9 so far in 2026.

Days with medium or heavy smoke overhead, by year 2011: 10 2012: 7 2013: 3 2014: 0 2015: 0 2016: 0 2017: 2 2018: 0 2019: 3 2020: 8 2021: 15 15 2022: 8 2023: 6 2024: 6 2025: 3 201120122013201420152016201720182019202020212022202320242025
Days each year on which a satellite-traced plume of medium or heavy smoke covered the county’s population centre, 2011 to 2025.
  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.

Floods and flood insurance

3 federal flood insurance claims since 1978, with $5,159 paid.

Federal flood insurance claims by year
Claims per year since 1978. Years with fewer than five claims are not shown.

Flood events since 1996

  • Flash Flood43
  • Flood1

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

Most severe crest

June 28, 1954

Independence Creek 18 miles SSE of Sheffield, 22.00 ft

11.00 feet above the 11.0 ft flood stage; major flooding by today’s categories.

Most recent moderate or major crest

May 29, 2024

Independence Creek 18 miles SSE of Sheffield, 17.60 ft

Moderate flooding.

Highest river crests above flood stage
Jun 28, 1954Independence Creek 18 miles SSE of Sheffield22.00+11.00Major
Nov 5, 1978Rio Grande 14 miles S of Dryden61.33+2.33Major
Jul 25, 2004Independence Creek 18 miles SSE of Sheffield17.95+6.95Moderate
May 29, 2024Independence Creek 18 miles SSE of Sheffield17.60+6.60Moderate
Sep 20, 1974Independence Creek 18 miles SSE of Sheffield16.74+5.74Moderate
Sep 11, 2008Independence Creek 18 miles SSE of Sheffield16.24+5.24Moderate
May 25, 2014Independence Creek 18 miles SSE of Sheffield14.98+3.98Minor
Oct 25, 2023Independence Creek 18 miles SSE of Sheffield11.94+0.94Minor
Apr 15, 1977Independence Creek 18 miles SSE of Sheffield8.70−2.30Action
Jul 10, 2010Rio Grande 14 miles S of Dryden36.07−22.93Action
Sep 30, 1991Rio Grande 14 miles S of Dryden26.90−32.10Action
Jul 27, 2013Rio Grande 14 miles S of Dryden22.43−36.57Below flood stage

River gauges

River gauges and their highest listed crests
Independence Creek 18 miles SSE of Sheffield11.022.00 ftJun 28, 19541
Rio Grande 14 miles S of Dryden59.061.33 ftNov 5, 19781
  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.

Drought

In severe drought or worse for 161 of 1,581 months since 1895 (10%); the longest spell lasted 20 months.

161

Months in severe drought or worse since 1895

66

Months in extreme drought

10%

Share of all months, severe or worse

16

Drought reports to the Weather Service since 1996

Lowest reading

September 2011

−5.95, extreme drought

Longest severe spell

20 months

August 1952 to March 1954.

Latest month

September 2026

−3.13, severe drought

Months in severe drought or worse, by year 1895: 0 1896: 1 1897: 0 1898: 0 1899: 0 1900: 0 1901: 1 1902: 5 1903: 0 1904: 0 1905: 0 1906: 0 1907: 0 1908: 0 1909: 0 1910: 3 1911: 1 1912: 0 1913: 0 1914: 0 1915: 0 1916: 1 1917: 9 1918: 10 1919: 0 1920: 0 1921: 0 1922: 0 1923: 0 1924: 0 1925: 0 1926: 0 1927: 0 1928: 0 1929: 0 1930: 2 1931: 0 1932: 0 1933: 0 1934: 7 1935: 4 1936: 0 1937: 0 1938: 0 1939: 0 1940: 0 1941: 0 1942: 0 1943: 0 1944: 0 1945: 0 1946: 0 1947: 0 1948: 0 1949: 0 1950: 0 1951: 3 1952: 10 1953: 12 12 1954: 7 1955: 3 1956: 8 1957: 3 1958: 0 1959: 0 1960: 0 1961: 0 1962: 2 1963: 0 1964: 0 1965: 0 1966: 0 1967: 0 1968: 0 1969: 0 1970: 0 1971: 0 1972: 0 1973: 0 1974: 0 1975: 0 1976: 0 1977: 0 1978: 0 1979: 0 1980: 1 1981: 0 1982: 0 1983: 0 1984: 0 1985: 0 1986: 0 1987: 0 1988: 0 1989: 1 1990: 1 1991: 0 1992: 0 1993: 0 1994: 0 1995: 0 1996: 1 1997: 0 1998: 1 1999: 0 2000: 7 2001: 0 2002: 1 2003: 0 2004: 0 2005: 0 2006: 4 2007: 0 2008: 1 2009: 0 2010: 0 2011: 9 2012: 4 2013: 0 2014: 0 2015: 0 2016: 0 2017: 0 2018: 0 2019: 0 2020: 5 2021: 2 2022: 7 2023: 0 2024: 8 2025: 8 18951905191519251935194519551965197519851995200520152025
Months each year with a Palmer index of −3 or lower, 1895 to 2025. Twelve means the whole year.
  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.

Earthquakes

3 earthquakes of magnitude 4 or more within 50 miles since 1900; the largest was magnitude 5.7 in 1995.

0

Magnitude 2.5+ inside the county since 1973

12

Magnitude 3+ within 50 miles since 1973

3

Magnitude 4+ within 50 miles since 1900

1

Magnitude 5+ within 50 miles since 1900

Largest within 50 miles

April 13, 1995

Magnitude 5.7

13 km NW of Marathon, Texas; 46.5 miles away, 11.1 miles deep.

Most recent, magnitude 3 or more

May 10, 2020

Magnitude 3.1

15 km NW of Marathon, Texas; 47.9 miles away.

Earthquakes of magnitude 3 or more within 50 miles, by year 1973: 0 1974: 0 1975: 0 1976: 0 1977: 0 1978: 0 1979: 0 1980: 0 1981: 0 1982: 1 1983: 0 1984: 0 1985: 0 1986: 0 1987: 0 1988: 0 1989: 0 1990: 0 1991: 0 1992: 0 1993: 0 1994: 0 1995: 5 5 1996: 0 1997: 0 1998: 1 1999: 0 2000: 0 2001: 0 2002: 0 2003: 0 2004: 0 2005: 0 2006: 0 2007: 0 2008: 0 2009: 0 2010: 0 2011: 1 2012: 1 2013: 0 2014: 1 2015: 1 2016: 0 2017: 0 2018: 0 2019: 0 2020: 1 2021: 0 2022: 0 2023: 0 2024: 0 2025: 0 19731978198319881993199820032008201320182023
Per year, 1973 to 2025.

Every earthquake of magnitude 4 or more within 50 miles

Earthquakes of magnitude 4 or more within 50 miles
May 14, 20154.036.59.884 km S of Sanderson, Texas
Apr 15, 19954.045.26.210 km NW of Marathon, Texas
Apr 13, 19955.746.511.113 km NW of Marathon, Texas
  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.

Severe weather and other events

248 events in the National Weather Service record, 210 of them since 1996.

87

Hail reports, 1 inch or larger

28

Hail, 2 inches or larger

40

Damaging gusts, 58 mph+

7

Winter weather events since 1996

0

Heat events since 1996

0

Cold events since 1996

Largest hail

April 29, 2009

4.25 inches

Strongest measured or estimated gust

June 10, 2025

93 mph

Costliest events since 1996

  1. Jul 25, 2004Flash Flood$1.1 million
    National Weather Service narrative

    A large complex of thunderstorms erupted over southeastern Pecos County, northeastern Brewster County, and much of Terrell County during the pre-dawn hours Sunday. Terrell County received the heaviest rainfall, with KMAF 88D Doppler radar estimates that totaled seven to nine inches over rural portions of north-central Terrell County between 03:00 and 12:00 CST. Widespread and damaging flash flood conditions resulted across the west Texas Lower Trans Pecos. This heavy rainfall and its associated runoff produced flash flooding along Dry Creek and Independence Creek. Local officials reported that a wall of water that measured eighteen feet in height propagated down Dry Creek in the…

  2. Jun 2, 2024Tornado$400,000
    National Weather Service narrative

    Photos showed a tornado formed very near Sanderson along a ridge northwest of town. This tornado immediately entered a neighborhood west of US Highway 285 in Sanderson. Damage in this neighborhood included damage to walls and roofs of several houses with the complete destruction of a manufactured home. A sturdy steel carport collapsed in on itself, and trees were debarked in the area. This damage was rated with a max estimated wind speed of 140 MPH, making this tornado an EF-3. This tornado would continue a short distance to the east of this neighborhood, moving shipping containers and snapping power poles before lifting. Property damage cost is an estimation. Additionally, 12…

  3. Jul 25, 2004Flash Flood$300,000
    National Weather Service narrative

    Flash flooding along Independence Creek inundated the intersection of State Highway 349 and Farm to Market Road 2400 in northern Terrell County. A local newspaper reported that flood waters stranded a pair of motorists at the intersection. Emergency crews from Iraan (Pecos County) responded and conducted swift water rescues to bring the couple to safety. Dangerous flash flood conditions along Independence Creek, Farm to Market Road 2400 and its intersection with State Highway 349 corresponded to a flood wave measured along the creek at the Chandler Ranch, several miles east-southeast of the intersection. At 09:45 CST a gauge registered a crest of eighteen feet. Independence Creek…

  4. Jun 15, 1997Thunderstorm Wind$200,000
    National Weather Service narrative

    An HP supercell in the western part of Terrell County produced a bow echo on its southern flank as it approach Sanderson with the apex of the bow aimed at the town. Damaging winds rushed into town with torrential rains and mostly pea size hail. The most substantial damage was to a department store that had the roof blown off and the front wall collapse into the street. Signs were bent over, trees uprooted, and power poles broken. Also a large Texaco sign was blown down and dumpsters were overturned and pushed down alleys. It was evident from the damage that all the winds were blowing from the west or northwest.

  5. Jul 25, 2004Flash Flood$200,000
    National Weather Service narrative

    The first of two flash floods along the Pecos River in northeastern Terrell County occurred just before sunrise. Runoff from the Dry Creek flood that damaged State Highway 349 emptied into the Pecos River from the lower portion of Independence Creek. The Chandler Ranch headquarters, located in a flood plain adjacent to the merger of Independence Creek and the Pecos River, sustained serious damage. Ranch residents described a large "wall" of water that swept through the flood plain and inundated the headquarters. Large trees were uprooted by the currents. A swimming pool was destroyed by debris carried in the raging water. Several structures, including a permanent residence, were…

  6. Jul 25, 2004Flood, Terrell$100,000
    National Weather Service narrative

    Flood waters from the swollen Dry Creek isolated thirteen workers from the Grey Wolf Drilling Company. The men were stranded on an "island" for almost thirty-six hours at an oil well site twenty-two miles northeast of Dryden. A helicopter rescue was attempted around 14:00 CST Sunday, but adverse weather conditions restricted rescue operations. The workers were not seriously injured when they walked to safety around 15:00 CST on Monday, July 26th. Minor flood damage to oil field equipment occurred.

  7. Apr 21, 2011Tornado$100,000
    National Weather Service narrative

    Tornado damage was reported near Sanderson at approximately 17:45 CST. Several cedar trees were destroyed as the tornado tracked east southeast. A home and barn were also destroyed by the tornado. Spotter reports indicate the tornado was 1/2 mile wide and travelled approximately 9 miles.

  8. Jun 2, 2024Tornado$100,000
    National Weather Service narrative

    The same supercell thunderstorm that caused the first tornado would quickly produce another smaller tornado near the center of Sanderson a short time later. This tornado was photographed as a skinny rope tornado moving roughly parallel to Oak Street. This tornado would snap power poles, damage roofs, and destroy a small wooden building before lifting. This short-lived tornado was rated an EF-1 with peak winds estimated to have been 110 MPH. Property damage cost is an estimation.

  9. Jul 25, 2004Flash Flood$100,000
    National Weather Service narrative

    A second wave of convection developed over the Lower Trans Pecos region Sunday evening. The additional rain combined with the saturated conditions and standing water to quickly result in another round of flash flooding. The Chandler Ranch headquarters was impacted by a second large flood wave that propagated down the Pecos River and produced flash flooding. This event damaged several structures, including the foundation of a primary ranch residence which was cracked by the force of the flood waters. No injuries were reported.

  10. Mar 4, 2004Thunderstorm Wind$75,000
    National Weather Service narrative

    Employees at the Terrell County Gas Plant reported winds up to 70 MPH. The winds knocked over a large storage vessel that weighed several tons. In addition, a service unit was also damaged.

  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.

Weather records

No weather station within 40 miles has the 30 years of complete, current records this section needs.

Federal disaster declarations

16 since 1953. The most recent: Flooding, July 18, 2026.

Federal disaster declarations
Jul 18, 2026FloodFloodingEmergencyEM-3649-TX
May 17, 2024FloodSevere Storms, Straight-Line Winds, Tornadoes, and FloodingMajor disasterDR-4781-TX
Feb 19, 2021Severe Ice StormSevere Winter StormsMajor disasterDR-4586-TX
Feb 14, 2021Severe Ice StormSevere Winter StormEmergencyEM-3554-TX
Mar 25, 2020BiologicalCovid-19 PandemicMajor disasterDR-4485-TX
Mar 13, 2020BiologicalCovid-19EmergencyEM-3458-TX
Jul 1, 2011FireWildfiresMajor disasterDR-1999-TX
Mar 14, 2008FireWildfiresEmergencyEM-3284-TX
Jan 11, 2006FireExtreme Wildfire ThreatMajor disasterDR-1624-TX
Sep 24, 2005HurricaneHurricane RitaMajor disasterDR-1606-TX
Sep 21, 2005HurricaneHurricane RitaEmergencyEM-3261-TX
Sep 2, 2005HurricaneHurricane Katrina EvacuationEmergencyEM-3216-TX
Sep 1, 1999FireExtreme Fire HazardsEmergencyEM-3142-TX
Aug 26, 1998Severe StormTropical Storm CharleyMajor disasterDR-1239-TX
Sep 10, 1993DroughtExtreme Fire HazardEmergencyEM-3113-TX
Jun 19, 1965TornadoTornadoes & FloodingMajor disasterDR-199-TX

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.

How this compares

Where Terrell County stands among 254 counties in Texas and 3,143 in the United States.

Ranks
Tornadoes since 195010232 / 2542,235 / 3,143
Tornadoes rated F3/EF3 or stronger283 / 254866 / 3,143
Tropical cyclones within 50 mi4112 / 2541,001 / 3,143
Hurricane-strength passes within 50 mi0——
Wildfire acres since 198454,27452 / 254446 / 3,143
Flood insurance claims3185 / 2542,656 / 3,143
Flood insurance paid$5,159206 / 2542,763 / 3,143
Disaster declarations16185 / 2542,158 / 3,143
Flood events since 199644137 / 2541,593 / 3,143
Hail and wind events since 1996135190 / 2542,509 / 3,143
Winter storm events since 19967230 / 2542,899 / 3,143
Reported damage since 1996$2.9 million210 / 2542,629 / 3,143
River crests at major flood stage2116 / 2541,260 / 3,143
High tide flooding days a year, last 10 years0.0——
Months in severe drought since 1895161187 / 254717 / 3,143
Medium or heavy smoke days a year, last 10 years5.1251 / 2543,062 / 3,143
Earthquakes M4+ within 50 mi since 1900378 / 254949 / 3,143
Earthquakes M2.5+ in the county since 19730——

Neighbouring counties

Neighbouring counties
Brewster County212238,81612
Crockett County134170,6693
Pecos County983279,5870
Val Verde County456154,974163

Sources and vintage

Every number on this page comes from these public records.

  • 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.
  • 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.
  • 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.