Storm Station

Beside a road

RWIS network, identified by the register

Identifier
CF181
Latitude
38.58567 N
Longitude
121.45133 W
Elevation
36 ft
Rank
3,967of 4,072 in California, Oct 4
Air temperature
67.5F
Wind
1mph
Gust
1mph
Wind direction
3°

On the radar over 51SB at Elvas Pump HouseReflectivityStorm 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

51SB at Elvas Pump House Report

Rank 3,967 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 score59.1of 100

  1. Reports receivedweight 358.168 of 840 scheduled reports received in 7 days
  2. Arrivalweight 1086.2half its reports arrived within 17 min
  3. Continuityweight 1042.2longest silence 3.8 h, on a schedule of one report every 12 min
  4. Accuracyweight 2094.9its temperature against the airport station KSAC, 6.0 miles away, over 89 readings: typical difference 2.4 °F beyond a steady offset of +1.6 °F
  5. Instrument checksweight 15100.00 of 89 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
3,967of 4,072 in California, Oct 4
Days reported, 30 days
0 of 30
Time to reach Storm Station
16 min9 in 10 within 21 min
Against its reference, 30 days
+2.2 °Fwarmer than the airport station KSAC, 6.0 miles away, on average over 91 readings; typical difference 3.0 °F; also compared with 1 other reference station

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: 68 of 840 scheduled reports received, 8.0%.

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. 51SB at Elvas Pump House received 8.0 per cent, 68 of 840 scheduled reports, rank 3,967 of 4,072.WHERE IT RANKS IN CALIFORNIA, Oct 4THIS ONE: 8.0%, 68 OF 840, RANK 3,967 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

51SB at Elvas Pump House, 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 36 ft above sea level, 0 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 29.88 inHg and the temperature at 58.9 F.

Section from sea level of where 51SB at Elvas Pump House stands in the atmosphere, height to scale: the station 36 feet above sea level with 0 per cent of the air below it; the standard atmosphere's pressure there, 29.88 inches of mercury, and temperature, 58.9 degrees Fahrenheit.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT CF181FIG. D WHERE 51SB AT ELVAS PUMP HOUSE 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 ATMOSPHERE51SB AT ELVAS PUMP HOUSE0 PER CENT OF THE AIR BELOW IT36 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 HERE29.88 inHgSTANDARD TEMPERATURE HERE58.9 FTITLE51SB at Elvas Pump House, the columnSTATION REPORT · RWIS CF181TYPESECTIONSCALEHEIGHT TO SCALEREVFROM THE REGISTER SHEET 1 of 3DATE2026-10-04IDSR-CF181-1DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

From the Field Book

2The sun

Contents

On Oct 4 the noon sun stands 47 degrees above the horizon at 38.59 N, and the day is 11 h 31 min long. Level ground there takes 73 per cent of the noon sunlight a surface facing the sun would.

Elevation of the noon sun at 51SB at Elvas Pump House, angles true: on Oct 4 it stands 47 degrees above the horizon, against 75 at the June solstice, 51 at the equinoxes and 28 at the December solstice; the day is 11 h 31 min long.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT CF181FIG. E THE SUN AT 51SB AT ELVAS PUMP HOUSEELEVATION 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 75°EQUINOXES 51°DECEMBER SOLSTICE 28°OCT 4, 47°SOUTHANGLES TRUE; THE RAYS ARE OF ONE LENGTH AND DRAW DIRECTION ONLYDAY LENGTH 11 H 31 MINLEVEL GROUND TAKES 73 PER CENT OF THE NOON SUN A FACING SURFACE WOULDLATITUDE 38.59 N; THE SUN'S DECLINATION -4.6°TITLE51SB at Elvas Pump House, the sunSTATION REPORT · RWIS CF181TYPEELEVATIONSCALEANGLES TRUEREVFROM THE REGISTER SHEET 2 of 3DATE2026-10-04IDSR-CF181-2DRAWN AS linework on paperSOURCES FB-ENG-007

From the Field Book

3The instrument

Contents

A road weather station, 36 ft above sea level. Its sensors, as its network builds them.

Elevation of a road weather station, 51SB at Elvas Pump House, each sensor drawn and labelled with what it read: no reading in the last day.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT CF181FIG. 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 SCALETITLE51SB at Elvas Pump House, the instrumentSTATION REPORT · RWIS CF181TYPEELEVATIONSCALESCHEMATICREVFROM THE REGISTER SHEET 3 of 3DATE2026-10-04IDSR-CF181-3DRAWN 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 51SB at Elvas Pump House

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