Storm Station

Beside a road

RWIS network, identified by the register

Identifier
CF138
Latitude
37.70719 N
Longitude
121.51496 W
Elevation
255 ft
Rank
3,913of 4,072 in California, Oct 4
Air temperature
81.7F
Dew point
32.6F
Relative humidity
17%
Visibility
12.4mi
Wind
4mph
Gust
6mph
Wind direction
222°

On the radar over I-580 - Hansen RoadReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

Beside a road

Drawn as the kind of place it stands at. 136 instruments in California stand at one.

Station charts

I-580 - Hansen Road Report

Rank 3,913 of 4,072 in California, Oct 4. The 247 rank orders a state's stations by their 247 score out of 100: how reliably they report, how accurate their readings are against a reference station, how their readings pass their checks, and how they stand against the forecast.

247 score62.2of 100

  1. Reports receivedweight 358.788 of 1,008 scheduled reports received in 7 days
  2. Arrivalweight 1091.2half its reports arrived within 14 min
  3. Continuityweight 1056.4longest silence 2 h, on a schedule of one report every 10 min
  4. Accuracyweight 20100.0its temperature against the airport station KTCY, 4.0 miles away, over 88 readings: typical difference 1.9 °F beyond a steady offset of +0.3 °F
  5. Instrument checksweight 15100.00 of 88 readings failed their check against its reference station
  6. Forecast checkweight 10--

The score is the weighted mean of its six parts, from the last 7 days. How a station is ranked sets out each part.

Rank
3,913of 4,072 in California, Oct 4
Days reported, 30 days
0 of 30
Time to reach Storm Station
14 min9 in 10 within 24 min
Against its reference, 30 days
+0.1 °Fwarmer than the airport station KTCY, 4.0 miles away, on average over 122 readings; typical difference 1.9 °F

The reports received are counted from the network's own archive of this station's reports. Its 247 rank is counted from Storm Station's own record, which holds less than 7 days of it so far: 88 of 1,008 scheduled reports received, 8.7%.

Against its reference: each temperature this station reports is compared with the nearest airport or climate reference station that reported within half an hour, up to 15 miles away. The figure is its reading less the reference's, on average, as both were reported; the typical difference is the root mean square. The difference in height is shown where both heights are known.

Chart of the 4,072 ranked stations in California on Oct 4 by the share of their scheduled reports received in Storm Station's own record, up to 7 days, in tenths: 0 to 9 per cent, 86; 10 to 19 per cent, 52; 20 to 29 per cent, 8; 30 to 39 per cent, 43; 40 to 49 per cent, 36; 50 to 59 per cent, 54; 60 to 69 per cent, 151; 70 to 79 per cent, 116; 80 to 89 per cent, 218; 90 to 99 per cent, 2,244; 100 per cent, 1,064. I-580 - Hansen Road received 8.7 per cent, 88 of 1,008 scheduled reports, rank 3,913 of 4,072.WHERE IT RANKS IN CALIFORNIA, Oct 4THIS ONE: 8.7%, 88 OF 1,008, RANK 3,913 OF 4,072PER CENT OF SCHEDULED REPORTS RECEIVEDIN STORM STATION'S OWN RECORD, UP TO 7 DAYS1101001,0000 to 98610 to 195220 to 29830 to 394340 to 493650 to 595460 to 6915170 to 7911680 to 8921890 to 992,2441001,064STATIONS, LOG SCALE
The ranking these charts were drawn from, as tables
Share of scheduled reports receivedStations
100%1,064
90 to 99%2,244
80 to 89%218
70 to 79%116
60 to 69%151
50 to 59%54
40 to 49%36
30 to 39%43
20 to 29%8
10 to 19%52
0 to 9%86

Station report

I-580 - Hansen Road, in 3 sheets

Drawn from the register, in the manner of the Field Book, and opened beside the plates that explain each part of it.

1The column

Contents

At 255 ft above sea level, 1 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 29.65 inHg and the temperature at 58.1 F.

Section from sea level of where I-580 - Hansen Road stands in the atmosphere, height to scale: the station 255 feet above sea level with 1 per cent of the air below it; the standard atmosphere's pressure there, 29.65 inches of mercury, and temperature, 58.1 degrees Fahrenheit.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT CF138FIG. D WHERE I-580 - HANSEN ROAD STANDS IN THE ATMOSPHERESECTION FROM SEA LEVEL, HEIGHT TO SCALE, THE STATION IN THE STANDARD ATMOSPHEREFT ABOVE SEA LEVEL05,00010,00015,000SEA LEVEL, 29.92 inHg IN THE STANDARD ATMOSPHEREI-580 - HANSEN ROAD1 PER CENT OF THE AIR BELOW IT255 FT10 PER CENT OF THE AIR BELOW, 2,890 FT20 PER CENT OF THE AIR BELOW, 6,050 FT30 PER CENT OF THE AIR BELOW, 9,540 FT40 PER CENT OF THE AIR BELOW, 13,470 FTSTANDARD PRESSURE HERE29.65 inHgSTANDARD TEMPERATURE HERE58.1 FTITLEI-580 - Hansen Road, the columnSTATION REPORT · RWIS CF138TYPESECTIONSCALEHEIGHT TO SCALEREVFROM THE REGISTER SHEET 1 of 3DATE2026-10-04IDSR-CF138-1DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

From the Field Book

2The sun

Contents

On Oct 4 the noon sun stands 48 degrees above the horizon at 37.71 N, and the day is 11 h 32 min long. Level ground there takes 74 per cent of the noon sunlight a surface facing the sun would.

Elevation of the noon sun at I-580 - Hansen Road, angles true: on Oct 4 it stands 48 degrees above the horizon, against 76 at the June solstice, 52 at the equinoxes and 29 at the December solstice; the day is 11 h 32 min long.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT CF138FIG. E THE SUN AT I-580 - HANSEN ROADELEVATION LOOKING WEST, SOUTH TO THE LEFT: THE NOON SUN ON THE DAY OF THE REPORT, AND AT THE SOLSTICES AND EQUINOXES; ANGLES TRUETHE STATIONJUNE SOLSTICE 76°EQUINOXES 52°DECEMBER SOLSTICE 29°OCT 4, 48°SOUTHANGLES TRUE; THE RAYS ARE OF ONE LENGTH AND DRAW DIRECTION ONLYDAY LENGTH 11 H 32 MINLEVEL GROUND TAKES 74 PER CENT OF THE NOON SUN A FACING SURFACE WOULDLATITUDE 37.71 N; THE SUN'S DECLINATION -4.6°TITLEI-580 - Hansen Road, the sunSTATION REPORT · RWIS CF138TYPEELEVATIONSCALEANGLES TRUEREVFROM THE REGISTER SHEET 2 of 3DATE2026-10-04IDSR-CF138-2DRAWN AS linework on paperSOURCES FB-ENG-007

From the Field Book

3The instrument

Contents

A road weather station, 255 ft above sea level. Its sensors, as its network builds them.

Elevation of a road weather station, I-580 - Hansen Road, each sensor drawn and labelled with what it read: no reading in the last day.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT CF138FIG. F THE INSTRUMENTELEVATION OF A ROAD WEATHER STATION, EACH SENSOR WITH WHAT IT READTHE ROAD, IN SECTIONPAVEMENT SENSOR, SET IN THE ROAD-PROBE UNDER THE ROAD-AIR TEMPERATURE ON THE TOWER-WIND AT THE TOP OF THE TOWER-SCHEMATIC; THE SPACING BETWEEN SENSORS IS NOT TO SCALETITLEI-580 - Hansen Road, the instrumentSTATION REPORT · RWIS CF138TYPEELEVATIONSCALESCHEMATICREVFROM THE REGISTER SHEET 3 of 3DATE2026-10-04IDSR-CF138-3DRAWN AS linework on paperSOURCES FB-INS-001

From the Field Book

The instrumentWhat an instrument is FB-INS-001Stevenson screen and siting FB-INS-009

What it seesLapse rates and stability FB-ENG-005Water vapour as a gas FB-ENG-011Blizzard FB-EVT-081Ice storm FB-EVT-084Heat wave and heat dome FB-EVT-130Fire weather FB-EVT-139High wind FB-EVT-150Humidity variables FB-WAT-002Fog types FB-WAT-020

Near I-580 - Hansen Road

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