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Callahan, Florida

Town in Nassau County, Florida

Air quality

The air at Callahan

Index 69, moderate, led by fine particles. Read at 12 AM from its reporting area, Jacksonville (FL), 19 miles off.

69Moderate
  • Fine particles (PM2.5)69Moderate15.6 mi
  • Ozone17Good4 ppb12.6 mi
  • Coarse particles (PM10)31Good18.2 mi
  • Nitrogen dioxide6Good6 ppb18.2 mi
  • Sulfur dioxide0Good0.3 ppb18.2 mi
  • Carbon monoxide-0.6 ppm24.5 mi

The days ahead

Good each day through Tue Oct 20, led by ozone. Yesterday measured 46, good.

Smoke, the next 44 hours

Little smoke near the ground through Sat 8 PM: the index from smoke stays at 17 or under.

FriSat

Precipitation

What has fallen at Callahan

None in the last 3 days, to Thu 11 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.00in

Visibility

How far you can see at Callahan, the next 44 hours

Visibility stays 3 miles or more through Sat 8 PM, lowest 4 miles Fri 8 AM.

FriSat

On the radar over Callahan, FloridaReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 5 instruments nearest Callahan, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 4.8 miles away.

measured now3 instruments

measured daily2 instruments

Station report

The weather at Jacksonville Intl, drawn

The nearest airport reporting now, 9.6 mi from Callahan, Florida. From its report of Oct 15, 2026, 11:56 PM local time: 3 of its 6 sheets.

The sky

No cloud below 12,000 ft; visibility 10 mi or more.

Section of the sky over Jacksonville Intl, height above the station to scale: no cloud detected below 12,000 feet, the reach of its ceilometer, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT JAXFIG. A THE SKY OVER JACKSONVILLE INTLSECTION, HEIGHT ABOVE THE STATION TO SCALE, EACH LAYER AT THE HEIGHT OF ITS BASE AS REPORTED; COVER IN EIGHTHS OF THE SKY; TOPS NOT MEASUREDFT ABOVE THE STATION05001,0001,5002,0002,5003,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETNO CLOUD DETECTED BELOW 12,000 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEJacksonville Intl, the skySTATION REPORT · ASOS JAXTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-JAX-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

69.0 F with a dew point of 67.0 F, 93 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 500 ft up.

Chart of the air at Jacksonville Intl: temperature 69.0 degrees Fahrenheit and dew point 67.0, 93 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 500 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT JAXFIG. B THE AIR AT JACKSONVILLE INTLTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00060 F70 F80 FSATURATES 500 FT ABOVE THE STATION, AT 66.5 FTEMPERATURE AND DEW POINT 69.0 F, 67.0 FRELATIVE HUMIDITY 93 PER CENTTHE AIR COOLS ABOUT 5.4 F EACH 1,000 FT IT RISES, AND ITS DEW POINT ABOUT 1 FSOLID: THE LIFTED AIR'S TEMPERATURE; DASHED: ITS DEW POINTTITLEJacksonville Intl, the airSTATION REPORT · ASOS JAXTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-JAX-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

Calm.

Plan of the wind at Jacksonville Intl, north up: calm; beside it the Beaufort scale from calm to hurricane force, force 0, calm, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT JAXFIG. C THE WIND AT JACKSONVILLE INTLPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONCALMBEAUFORT FORCELEAST WIND, MPH0CALM0NOW, 0 MPH1LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEJacksonville Intl, the windSTATION REPORT · ASOS JAXTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-JAX-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Jacksonville Intl, in 6 sheets, each beside the Field Book plates that explain it

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Snow on the ground

Elsewhere in Florida

25 places, each with its own forecast and its own instruments.

Near Callahan

The nearest places, each with its own forecast and the instruments nearest it.

Near Callahan

River and lake gauges