Storm Station
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Beside a road

RWIS network, identified by the register

Identifier
CF181
Latitude
38.58567 N
Longitude
121.45133 W
Elevation
36 ft
Rank
3,861of 4,465 in California, Oct 16
Observed
12:50 AMPDT, 25 minutes ago
Road surface
dry
Air temperature
58.6F
Wind
0mph
Gust
2mph
Wind direction
2°
Pavement temperature
62.6F

Ranking Statistics

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 3,861 of 4,465 in California, Oct 16. 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.

Ranking Statistics

247 score77.1of 100

California median
91.6the median score of 4,465 stations
Scoring higher
3,858stations in California
Sharing its score
7ranks 3,859 to 3,865
Points deducted
22.913.4 reports received, 7.3 continuity, 1.0 arrival, 0.8 forecast check, 0.5 accuracy
Counted at the median
Forecast checknot measured at this station; California median 92.4
Next above
ASIC1rank 3,860; ahead on reports received 79.7% against 61.6%
Next below
KB6HGNrank 3,862; behind on reports received 61.6% against 56.1%

Equal scores are ordered by the share of scheduled reports received, then the reports due in the week (the longer record first), then the median arrival, then the longest silence.

  1. Reports receivedweight 3561.721.6 of 35 pointsCalifornia median 98.5565 of 916 scheduled reports received in 7 days
  2. Arrivalweight 1090.39.0 of 10 pointsCalifornia median 81.2half its reports arrived within 15 min
  3. Continuityweight 1027.52.8 of 10 pointsCalifornia median 100.0longest silence 5.5 h, on a schedule of one report every 11 min
  4. Accuracyweight 2097.619.5 of 20 pointsCalifornia median 85.6its temperature against the airport station KSAC, 6.0 miles away, over 615 readings: typical difference 2.3 °F beyond a steady offset of +1.9 °F
  5. Instrument checksweight 15100.015.0 of 15 pointsCalifornia median 100.00 of 615 readings failed their check against its reference station
  6. Forecast checkweight 10-9.2 of 10 points, at the medianCalifornia median 92.4-

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

How each part is scored
Reports received
Full marks for every scheduled report received, none for none, in proportion between
Arrival
Full marks for a median arrival within 10 min, none at 60 min
Continuity
Full marks for a longest silence of 3 reports or less (33 min), none for 72 (13.2 h)
Accuracy
Full marks within 2.1 °F of its reference, typically, none beyond 8.6 °F
Instrument checks
Full marks for no reading failed, none for 5 per cent or more
Forecast check
Full marks within 2 °F of the forecast on average, none at 8 °F
Rank
3,861of 4,465 in California, Oct 16
Days reported, 30 days
0 of 30
Time to reach Storm Station
15 min9 in 10 within 20 min
Against its reference, 30 days
+2.2 °Fwarmer than the airport station KSAC, 6.0 miles away, on average over 850 readings; typical difference 3.1 °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: 565 of 916 scheduled reports received, 61.6%.

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 4,465 ranked stations in California on Oct 16 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, 78; 10 to 19 per cent, 83; 20 to 29 per cent, 45; 30 to 39 per cent, 22; 40 to 49 per cent, 118; 50 to 59 per cent, 285; 60 to 69 per cent, 120; 70 to 79 per cent, 209; 80 to 89 per cent, 391; 90 to 99 per cent, 2,034; 100 per cent, 1,080. 51SB at Elvas Pump House received 61.6 per cent, 565 of 916 scheduled reports, rank 3,861 of 4,465.WHERE IT RANKS IN CALIFORNIA, Oct 16THIS ONE: 61.6%, 565 OF 916, RANK 3,861 OF 4,465PER CENT OF SCHEDULED REPORTS RECEIVEDIN STORM STATION'S OWN RECORD, UP TO 7 DAYS1101001,0000 to 97810 to 198320 to 294530 to 392240 to 4911850 to 5928560 to 6912070 to 7920980 to 8939190 to 992,0341001,080STATIONS, LOG SCALE
Chart of 51SB at Elvas Pump House's rank in California by how it reported, day by day, from 2026-10-04 to 2026-10-16: 2026-10-04 rank 3,967 of 4,072; 2026-10-05 rank 4,161 of 4,333; 2026-10-06 rank 4,147 of 4,362; 2026-10-07 rank 4,094 of 4,381; 2026-10-08 rank 4,059 of 4,405; 2026-10-09 rank 3,753 of 4,400; 2026-10-10 rank 3,755 of 4,400; 2026-10-11 rank 3,724 of 4,428; 2026-10-12 rank 3,815 of 4,446; 2026-10-13 rank 3,881 of 4,464; 2026-10-14 rank 3,904 of 4,466; 2026-10-15 rank 3,917 of 4,462; 2026-10-16 rank 3,861 of 4,465.ITS RANK IN CALIFORNIA, DAY BY DAYRANK, FIRST AT THE TOP12,0004,0006,000Oct 4Oct 7Oct 10Oct 13Oct 16
The ranking these charts were drawn from, as tables
Share of scheduled reports receivedStations
100%1,080
90 to 99%2,034
80 to 89%391
70 to 79%209
60 to 69%120
50 to 59%285
40 to 49%118
30 to 39%22
20 to 29%45
10 to 19%83
0 to 9%78
DayRankStations rankedShare received
Oct 16, 20263,8614,46561.6%
Oct 15, 20263,9174,46260.3%
Oct 14, 20263,9044,46660.8%
Oct 13, 20263,8814,46460.5%
Oct 12, 20263,8154,44662.8%
Oct 11, 20263,7244,42867.0%
Oct 10, 20263,7554,40064.5%
Oct 9, 20263,7534,40064.2%
Oct 8, 20264,0594,40547.7%
Oct 7, 20264,0944,38142.2%
Oct 6, 20264,1474,36230.1%
Oct 5, 20264,1614,33318.9%
Oct 4, 20263,9674,0728.0%

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 3DATE2026-10-16IDSR-CF181-1DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

From the Field Book

2The sun

Contents

On Oct 16 the noon sun stands 42 degrees above the horizon at 38.59 N, and the day is 11 h 01 min long. Level ground there takes 67 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 16 it stands 42 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 01 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 16, 42°SOUTHANGLES TRUE; THE RAYS ARE OF ONE LENGTH AND DRAW DIRECTION ONLYDAY LENGTH 11 H 01 MINLEVEL GROUND TAKES 67 PER CENT OF THE NOON SUN A FACING SURFACE WOULDLATITUDE 38.59 N; THE SUN'S DECLINATION -9.1°TITLE51SB at Elvas Pump House, the sunSTATION REPORT · RWIS CF181TYPEELEVATIONSCALEANGLES TRUEREVFROM THE REGISTER SHEET 2 of 3DATE2026-10-16IDSR-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 3DATE2026-10-16IDSR-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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