Storm Station
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In a volunteer observer's own ground

CWOP network, identified by the register

Identifier
W9SDA
Latitude
38.85000 N
Longitude
90.01000 W
Elevation
485 ft
Rank
1,174of 1,419 in Illinois, Oct 17
Observed
1:45 AMCDT, 10 minutes ago
Air temperature
45F
Relative humidity
88%
Pressure
30.48inHg
Wind
0mph
Gust
2mph
Wind direction
9°
Precipitation this hour
0in
Precipitation today
0in

Ranking Statistics

On the radar over Citizen station W9SDAReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

In a volunteer observer's own ground

Drawn as the kind of place it stands at. 1,777 instruments in Illinois stand at one.

Station charts

Citizen station W9SDA Report

Rank 1,174 of 1,419 in Illinois, Oct 17. 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 score82.5of 100

Illinois median
95.9the median score of 1,419 stations
Scoring higher
1,173stations in Illinois
Sharing its score
4ranks 1,174 to 1,177
Points deducted
17.514.0 reports received, 3.0 continuity, 0.6 forecast check
Counted at the median
Forecast checknot measured at this station; Illinois median 94.3
Next above
FW9176rank 1,173; ahead on 247 score 82.6 against 82.5
Next below
DW5254rank 1,175; behind on reports received 60.1% against 58.3%

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 3560.121.0 of 35 pointsIllinois median 99.1101 of 168 scheduled reports received in 7 days
  2. Arrivalweight 10100.010.0 of 10 pointsIllinois median 99.8half its reports arrived within 19 s
  3. Continuityweight 1070.17.0 of 10 pointsIllinois median 100.0longest silence 7.8 h, on a schedule of one report every 60 min
  4. Accuracyweight 20100.020.0 of 20 pointsIllinois median 100.0its temperature against the airport station KALN, 3.0 miles away, over 86 readings: typical difference 1.8 °F beyond a steady offset of -0.1 °F
  5. Instrument checksweight 15100.015.0 of 15 pointsIllinois median 100.00 of 86 readings failed their check against its reference station
  6. Forecast checkweight 10-9.4 of 10 points, at the medianIllinois median 94.3-

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 (3 h), none for 72 (72 h)
Accuracy
Full marks within 1.8 °F of its reference, typically, none beyond 8.3 °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
1,174of 1,419 in Illinois, Oct 17
Time to reach Storm Station
19 s9 in 10 within 30 s
Against its reference, 30 days
-0.6 °Fcooler than the airport station KALN, 3.0 miles away, on average over 160 readings; typical difference 2.3 °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: 101 of 168 scheduled reports received, 60.1%.

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 1,419 ranked stations in Illinois on Oct 17 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, 1; 10 to 19 per cent, 30; 20 to 29 per cent, 8; 30 to 39 per cent, 4; 40 to 49 per cent, 76; 50 to 59 per cent, 151; 60 to 69 per cent, 39; 70 to 79 per cent, 102; 80 to 89 per cent, 132; 90 to 99 per cent, 322; 100 per cent, 554. Citizen station W9SDA received 60.1 per cent, 101 of 168 scheduled reports, rank 1,174 of 1,419.WHERE IT RANKS IN ILLINOIS, Oct 17THIS ONE: 60.1%, 101 OF 168, RANK 1,174 OF 1,419PER CENT OF SCHEDULED REPORTS RECEIVEDIN STORM STATION'S OWN RECORD, UP TO 7 DAYS1101000 to 9110 to 193020 to 29830 to 39440 to 497650 to 5915160 to 693970 to 7910280 to 8913290 to 99322100554STATIONS, LOG SCALE
Chart of Citizen station W9SDA's rank in Illinois by how it reported, day by day, from 2026-10-05 to 2026-10-17: 2026-10-05 rank 1,213 of 1,318; 2026-10-06 rank 1,023 of 1,354; 2026-10-07 rank 1,135 of 1,449; 2026-10-08 rank 1,223 of 1,399; 2026-10-09 rank 1,149 of 1,364; 2026-10-10 rank 1,155 of 1,364; 2026-10-11 rank 1,170 of 1,359; 2026-10-12 rank 1,140 of 1,354; 2026-10-13 rank 1,124 of 1,360; 2026-10-14 rank 1,102 of 1,356; 2026-10-15 rank 1,137 of 1,375; 2026-10-16 rank 1,160 of 1,393; 2026-10-17 rank 1,174 of 1,419.ITS RANK IN ILLINOIS, DAY BY DAYRANK, FIRST AT THE TOP15001,0001,500Oct 5Oct 8Oct 11Oct 14Oct 17
The ranking these charts were drawn from, as tables
Share of scheduled reports receivedStations
100%554
90 to 99%322
80 to 89%132
70 to 79%102
60 to 69%39
50 to 59%151
40 to 49%76
30 to 39%4
20 to 29%8
10 to 19%30
0 to 9%1
DayRankStations rankedShare received
Oct 17, 20261,1741,41960.1%
Oct 16, 20261,1601,39358.9%
Oct 15, 20261,1371,37560.7%
Oct 14, 20261,1021,35661.9%
Oct 13, 20261,1241,36059.5%
Oct 12, 20261,1401,35458.3%
Oct 11, 20261,1701,35955.4%
Oct 10, 20261,1551,36455.7%
Oct 9, 20261,1491,36456.1%
Oct 8, 20261,2231,39951.0%
Oct 7, 20261,1351,44955.5%
Oct 6, 20261,0231,35458.8%
Oct 5, 20261,2131,31838.4%

Station report

Citizen station W9SDA, in 4 sheets

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

1The wind

Contents

Calm.

Plan of the wind at Citizen station W9SDA, 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 W9SDAFIG. C THE WIND AT CITIZEN STATION W9SDAPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONCALMBEAUFORT FORCELEAST WIND, MPH0CALM0NOW, 0 MPH1LIGHT AIR1GUST, 2 MPH2LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLECitizen station W9SDA, the windSTATION REPORT · CWOP W9SDATYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 1 of 4DATE2026-10-17IDSR-W9SDA-1DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008

From the Field Book

2The column

Contents

At 485 ft above sea level, 2 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 29.40 inHg and the temperature at 57.3 F; the station's altimeter setting of 30.48 inHg means its barometer reads 29.95 inHg; it reports 45.0 F, 12.3 F colder than standard.

Section from sea level of where Citizen station W9SDA stands in the atmosphere, height to scale: the station 485 feet above sea level with 2 per cent of the air below it; the standard atmosphere's pressure there, 29.40 inches of mercury, and temperature, 57.3 degrees Fahrenheit; the altimeter setting of 30.48 and the station pressure it means, 29.95.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT W9SDAFIG. D WHERE CITIZEN STATION W9SDA 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 ATMOSPHERECITIZEN STATION W9SDA2 PER CENT OF THE AIR BELOW IT485 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 HERE29.40 inHgSTANDARD TEMPERATURE HERE57.3 FALTIMETER SETTING, REPORTED30.48 inHgITS BAROMETER READS29.95 inHgTEMPERATURE, REPORTED45.0 FTITLECitizen station W9SDA, the columnSTATION REPORT · CWOP W9SDATYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 4DATE2026-10-17IDSR-W9SDA-2DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

From the Field Book

3The sun

Contents

On Oct 17 the noon sun stands 42 degrees above the horizon at 38.85 N, and the day is 10 h 58 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 Citizen station W9SDA, angles true: on Oct 17 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 10 h 58 min long.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT W9SDAFIG. E THE SUN AT CITIZEN STATION W9SDAELEVATION 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 17, 42°SOUTHANGLES TRUE; THE RAYS ARE OF ONE LENGTH AND DRAW DIRECTION ONLYDAY LENGTH 10 H 58 MINLEVEL GROUND TAKES 67 PER CENT OF THE NOON SUN A FACING SURFACE WOULDLATITUDE 38.85 N; THE SUN'S DECLINATION -9.5°TITLECitizen station W9SDA, the sunSTATION REPORT · CWOP W9SDATYPEELEVATIONSCALEANGLES TRUEREVAS REPORTED SHEET 3 of 4DATE2026-10-17IDSR-W9SDA-3DRAWN AS linework on paperSOURCES FB-ENG-007

From the Field Book

4The instrument

Contents

A weather instrument, 485 ft above sea level. Its latest report is written on the sensors that made it.

Elevation of the instrument, Citizen station W9SDA, each sensor drawn and labelled with what it read: air temperature, 45.0 f; precipitation gauge, 0.00 in today.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT W9SDAFIG. F THE INSTRUMENTELEVATION OF THE INSTRUMENT, EACH SENSOR WITH WHAT IT READANTENNA, SENDING BY SATELLITE-AIR TEMPERATURE45.0 FPRECIPITATION GAUGE0.00 IN TODAYSCHEMATIC; THE SPACING BETWEEN SENSORS IS NOT TO SCALETITLECitizen station W9SDA, the instrumentSTATION REPORT · CWOP W9SDATYPEELEVATIONSCALESCHEMATICREVAS REPORTED SHEET 4 of 4DATE2026-10-17IDSR-W9SDA-4DRAWN AS linework on paperSOURCES FB-INS-001

From the Field Book

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