Storm Station
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Beside a road

RWIS network, identified by the register

Identifier
CF106
Latitude
38.12820 N
Longitude
121.58556 W
Elevation
-16 ft
Rank
3,425of 4,465 in California, Oct 16
Observed
8:20 AMPDT, 22 minutes ago
Air temperature
55.2F
Dew point
39.3F
Relative humidity
55%
Visibility
12.4mi
Wind
3mph
Gust
4mph
Wind direction
125°

Ranking Statistics

On the radar over SR-12 - Brannan Island 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

SR-12 - Brannan Island Road Report

Rank 3,425 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 score81.3of 100

California median
91.6the median score of 4,465 stations
Scoring higher
3,420stations in California
Sharing its score
31ranks 3,421 to 3,451
Points deducted
18.79.5 reports received, 4.6 continuity, 2.9 accuracy, 1.0 arrival, 0.8 forecast check
Counted at the median
Accuracy, instrument checks, forecast checknot measured at this station; California median 85.6, 100.0, 92.4
Next above
DAGrank 3,424; ahead on reports received 77.3% against 73.0%
Next below
CF105rank 3,426; behind on reports received 73.0% against 72.9%

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 3573.025.6 of 35 pointsCalifornia median 98.5736 of 1,008 scheduled reports received in 7 days
  2. Arrivalweight 1090.49.0 of 10 pointsCalifornia median 81.2half its reports arrived within 15 min
  3. Continuityweight 1053.95.4 of 10 pointsCalifornia median 100.0longest silence 2.2 h, on a schedule of one report every 10 min
  4. Accuracyweight 20-17.1 of 20 points, at the medianCalifornia median 85.6-
  5. Instrument checksweight 15-15.0 of 15 points, at the medianCalifornia median 100.0-
  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 (30 min), none for 72 (12 h)
Accuracy
Full marks within 1.5 °F of its reference, typically, none beyond 8.0 °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
3,425of 4,465 in California, Oct 16
Days reported, 30 days
0 of 30
Time to reach Storm Station
15 min9 in 10 within 24 min

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: 736 of 1,008 scheduled reports received, 73.0%.

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. SR-12 - Brannan Island Road received 73.0 per cent, 736 of 1,008 scheduled reports, rank 3,425 of 4,465.WHERE IT RANKS IN CALIFORNIA, Oct 16THIS ONE: 73.0%, 736 OF 1,008, RANK 3,425 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 SR-12 - Brannan Island Road's rank in California by how it reported, day by day, from 2026-10-04 to 2026-10-16: 2026-10-04 rank 3,994 of 4,072; 2026-10-05 rank 4,186 of 4,333; 2026-10-06 rank 4,169 of 4,362; 2026-10-07 rank 4,129 of 4,381; 2026-10-08 rank 4,075 of 4,405; 2026-10-09 rank 3,809 of 4,400; 2026-10-10 rank 3,808 of 4,400; 2026-10-11 rank 3,762 of 4,428; 2026-10-12 rank 3,710 of 4,446; 2026-10-13 rank 3,715 of 4,464; 2026-10-14 rank 3,731 of 4,466; 2026-10-15 rank 3,587 of 4,462; 2026-10-16 rank 3,425 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, 20263,4254,46573.0%
Oct 15, 20263,5874,46271.9%
Oct 14, 20263,7314,46670.5%
Oct 13, 20263,7154,46470.5%
Oct 12, 20263,7104,44670.1%
Oct 11, 20263,7624,42870.2%
Oct 10, 20263,8084,40068.9%
Oct 9, 20263,8094,40068.5%
Oct 8, 20264,0754,40548.7%
Oct 7, 20264,1294,38139.2%
Oct 6, 20264,1694,36229.5%
Oct 5, 20264,1864,33319.2%
Oct 4, 20263,9944,0728.8%

Station report

SR-12 - Brannan Island 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 -16 ft above sea level, 0 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 29.92 inHg and the temperature at 59.1 F.

Section from sea level of where SR-12 - Brannan Island Road stands in the atmosphere, height to scale: the station -16 feet above sea level with 0 per cent of the air below it; the standard atmosphere's pressure there, 29.92 inches of mercury, and temperature, 59.1 degrees Fahrenheit.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT CF106FIG. D WHERE SR-12 - BRANNAN ISLAND 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 ATMOSPHERESR-12 - BRANNAN ISLAND ROAD0 PER CENT OF THE AIR BELOW IT-16 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 HERE29.92 inHgSTANDARD TEMPERATURE HERE59.1 FTITLESR-12 - Brannan Island Road, the columnSTATION REPORT · RWIS CF106TYPESECTIONSCALEHEIGHT TO SCALEREVFROM THE REGISTER SHEET 1 of 3DATE2026-10-16IDSR-CF106-1DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

From the Field Book

2The sun

Contents

On Oct 16 the noon sun stands 43 degrees above the horizon at 38.13 N, and the day is 11 h 02 min long. Level ground there takes 68 per cent of the noon sunlight a surface facing the sun would.

Elevation of the noon sun at SR-12 - Brannan Island Road, angles true: on Oct 16 it stands 43 degrees above the horizon, against 75 at the June solstice, 52 at the equinoxes and 28 at the December solstice; the day is 11 h 02 min long.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT CF106FIG. E THE SUN AT SR-12 - BRANNAN ISLAND 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 75°EQUINOXES 52°DECEMBER SOLSTICE 28°OCT 16, 43°SOUTHANGLES TRUE; THE RAYS ARE OF ONE LENGTH AND DRAW DIRECTION ONLYDAY LENGTH 11 H 02 MINLEVEL GROUND TAKES 68 PER CENT OF THE NOON SUN A FACING SURFACE WOULDLATITUDE 38.13 N; THE SUN'S DECLINATION -9.1°TITLESR-12 - Brannan Island Road, the sunSTATION REPORT · RWIS CF106TYPEELEVATIONSCALEANGLES TRUEREVFROM THE REGISTER SHEET 2 of 3DATE2026-10-16IDSR-CF106-2DRAWN AS linework on paperSOURCES FB-ENG-007

From the Field Book

3The instrument

Contents

A road weather station, -16 ft above sea level. Its sensors, as its network builds them.

Elevation of a road weather station, SR-12 - Brannan Island Road, each sensor drawn and labelled with what it read: no reading in the last day.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT CF106FIG. 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 SCALETITLESR-12 - Brannan Island Road, the instrumentSTATION REPORT · RWIS CF106TYPEELEVATIONSCALESCHEMATICREVFROM THE REGISTER SHEET 3 of 3DATE2026-10-16IDSR-CF106-3DRAWN 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 SR-12 - Brannan Island Road

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