Tidal Four Mile Run at Alexandria

Ranking Statistics

247 score98.3of 100

Virginia median

95.9the median score of 1,541 stations

Scoring higher

332stations in Virginia

Sharing its score

105ranks 333 to 437

Points deducted

1.71.4 arrival, 0.4 forecast check

Counted at the median

Accuracy, instrument checks, forecast checknot measured at this station; Virginia median 100.0, 100.0, 96.5

Next above

HPCV2rank 331; ahead on 247 score 98.4 against 98.3

Next below

VA-JC-24rank 336; behind on reports due 168 against 7, the longer record first

Sharing its rank

2other stations, equal on every measure

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 35100.035.0 of 35 pointsVirginia median 97.9168 of 168 scheduled reports received in 7 days
2. Arrivalweight 1086.38.6 of 10 pointsVirginia median 92.7half its reports arrived within 17 min
3. Continuityweight 10100.010.0 of 10 pointsVirginia median 100.0longest silence 60 min, on a schedule of one report every 60 min
4. Accuracyweight 20-20.0 of 20 points, at the medianVirginia median 100.0-
5. Instrument checksweight 15-15.0 of 15 points, at the medianVirginia median 100.0-
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.