Storm Station
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In a volunteer observer's own ground

CWOP network, identified by the register

Identifier
W4LAN
Latitude
38.42000 N
Longitude
78.18000 W
Elevation
545 ft
Rank
1,170of 1,541 in Virginia, Oct 16

Ranking Statistics

On the radar over Citizen station W4LANReflectivityStorm 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. 1,431 instruments in Virginia stand at one.

Station charts

Citizen station W4LAN Report

Rank 1,170 of 1,541 in Virginia, 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 score84.6of 100

Virginia median
95.9the median score of 1,541 stations
Scoring higher
1,169stations in Virginia
Sharing its score
16ranks 1,170 to 1,185
Points deducted
15.413.7 reports received, 1.4 continuity, 0.4 forecast check
Counted at the median
Forecast checknot measured at this station; Virginia median 96.5
Next above
EW1895rank 1,169; ahead on 247 score 84.9 against 84.6
Next below
VA-ND-2rank 1,171; behind on reports received 60.8% against 57.1%

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 3560.921.3 of 35 pointsVirginia median 97.9157 of 258 scheduled reports received in 7 days
  2. Arrivalweight 10100.010.0 of 10 pointsVirginia median 92.7half its reports arrived within 16 s
  3. Continuityweight 1086.48.6 of 10 pointsVirginia median 100.0longest silence 3 h, on a schedule of one report every 39 min
  4. Accuracyweight 20100.020.0 of 20 pointsVirginia median 100.0its temperature against the airport station KOMH, 13.9 miles away, over 189 readings: typical difference 2.2 °F beyond a steady offset of +1.3 °F
  5. Instrument checksweight 15100.015.0 of 15 pointsVirginia median 100.00 of 189 readings failed their check against its reference station
  6. Forecast checkweight 10-9.7 of 10 points, at the medianVirginia median 96.5-

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 (2 h), none for 72 (46.8 h)
Accuracy
Full marks within 2.9 °F of its reference, typically, none beyond 9.4 °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
1,170of 1,541 in Virginia, Oct 16
Time to reach Storm Station
16 s9 in 10 within 30 s
Against its reference, 30 days
+1.0 °Fwarmer than the airport station KOMH, 14 miles away, on average over 293 readings; typical difference 2.5 °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: 157 of 258 scheduled reports received, 60.8%.

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 1,541 ranked stations in Virginia 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, 5; 10 to 19 per cent, 17; 20 to 29 per cent, 48; 30 to 39 per cent, 6; 40 to 49 per cent, 81; 50 to 59 per cent, 182; 60 to 69 per cent, 29; 70 to 79 per cent, 130; 80 to 89 per cent, 138; 90 to 99 per cent, 543; 100 per cent, 362. Citizen station W4LAN received 60.8 per cent, 157 of 258 scheduled reports, rank 1,170 of 1,541.WHERE IT RANKS IN VIRGINIA, Oct 16THIS ONE: 60.8%, 157 OF 258, RANK 1,170 OF 1,541PER CENT OF SCHEDULED REPORTS RECEIVEDIN STORM STATION'S OWN RECORD, UP TO 7 DAYS1101000 to 9510 to 191720 to 294830 to 39640 to 498150 to 5918260 to 692970 to 7913080 to 8913890 to 99543100362STATIONS, LOG SCALE
Chart of Citizen station W4LAN's rank in Virginia by how it reported, day by day, from 2026-10-05 to 2026-10-16: 2026-10-05 rank 1,049 of 1,415; 2026-10-06 rank 1,082 of 1,444; 2026-10-07 rank 1,155 of 1,526; 2026-10-08 rank 1,159 of 1,534; 2026-10-09 rank 1,120 of 1,529; 2026-10-10 rank 1,123 of 1,530; 2026-10-11 rank 1,251 of 1,520; 2026-10-12 rank 1,241 of 1,532; 2026-10-13 rank 1,223 of 1,536; 2026-10-14 rank 1,195 of 1,537; 2026-10-15 rank 1,266 of 1,532; 2026-10-16 rank 1,170 of 1,541.ITS RANK IN VIRGINIA, DAY BY DAYRANK, FIRST AT THE TOP15001,0001,500Oct 5Oct 7Oct 9Oct 11Oct 13Oct 15Oct 16
The ranking these charts were drawn from, as tables
Share of scheduled reports receivedStations
100%362
90 to 99%543
80 to 89%138
70 to 79%130
60 to 69%29
50 to 59%182
40 to 49%81
30 to 39%6
20 to 29%48
10 to 19%17
0 to 9%5
DayRankStations rankedShare received
Oct 16, 20261,1701,54160.8%
Oct 15, 20261,2661,53252.6%
Oct 14, 20261,1951,53758.5%
Oct 13, 20261,2231,53655.9%
Oct 12, 20261,2411,53254.3%
Oct 11, 20261,2511,52052.0%
Oct 10, 20261,1231,53058.3%
Oct 9, 20261,1201,52958.6%
Oct 8, 20261,1591,53457.2%
Oct 7, 20261,1551,52659.7%
Oct 6, 20261,0821,44467.4%
Oct 5, 20261,0491,41570.0%

Station report

Citizen station W4LAN, 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 545 ft above sea level, 2 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 29.34 inHg and the temperature at 57.1 F.

Section from sea level of where Citizen station W4LAN stands in the atmosphere, height to scale: the station 545 feet above sea level with 2 per cent of the air below it; the standard atmosphere's pressure there, 29.34 inches of mercury, and temperature, 57.1 degrees Fahrenheit.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT W4LANFIG. D WHERE CITIZEN STATION W4LAN 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 W4LAN2 PER CENT OF THE AIR BELOW IT545 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 HERE29.34 inHgSTANDARD TEMPERATURE HERE57.1 FTITLECitizen station W4LAN, the columnSTATION REPORT · CWOP W4LANTYPESECTIONSCALEHEIGHT TO SCALEREVFROM THE REGISTER SHEET 1 of 3DATE2026-10-16IDSR-W4LAN-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 38.42 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 Citizen station W4LAN, 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 W4LANFIG. E THE SUN AT CITIZEN STATION W4LANELEVATION 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 38.42 N; THE SUN'S DECLINATION -9.1°TITLECitizen station W4LAN, the sunSTATION REPORT · CWOP W4LANTYPEELEVATIONSCALEANGLES TRUEREVFROM THE REGISTER SHEET 2 of 3DATE2026-10-16IDSR-W4LAN-2DRAWN AS linework on paperSOURCES FB-ENG-007

From the Field Book

3The instrument

Contents

A weather instrument, 545 ft above sea level. Its sensors, as its network builds them.

Elevation of the instrument, Citizen station W4LAN, each sensor drawn and labelled with what it read: no reading in the last day.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT W4LANFIG. F THE INSTRUMENTELEVATION OF THE INSTRUMENT, EACH SENSOR WITH WHAT IT READANTENNA, SENDING BY SATELLITE-AIR TEMPERATURE-PRECIPITATION GAUGE-SCHEMATIC; THE SPACING BETWEEN SENSORS IS NOT TO SCALETITLECitizen station W4LAN, the instrumentSTATION REPORT · CWOP W4LANTYPEELEVATIONSCALESCHEMATICREVFROM THE REGISTER SHEET 3 of 3DATE2026-10-16IDSR-W4LAN-3DRAWN AS linework on paperSOURCES FB-INS-001

From the Field Book

Near Citizen station W4LAN

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