Potomac River AT Alexandria Dock

Ranking Statistics

247 score94.8of 100

Virginia median

95.9the median score of 1,554 stations

Scoring higher

853stations in Virginia

Sharing its score

7ranks 854 to 860

Points deducted

5.22.6 reports received, 2.2 arrival, 0.4 forecast check

Counted at the median

Accuracy, instrument checks, forecast checknot measured at this station; Virginia median 100.0, 100.0, 95.7

Next above

CHOrank 859; ahead on reports received 98.2% against 92.6%

Next below

WHMV2rank 861; behind on 247 score 94.8 against 94.6

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 3592.632.4 of 35 pointsVirginia median 97.6778 of 840 scheduled reports received in 7 days
2. Arrivalweight 1077.97.8 of 10 pointsVirginia median 92.7half its reports arrived within 21 min
3. Continuityweight 10100.010.0 of 10 pointsVirginia median 100.0longest silence 36 min, on a schedule of one report every 12 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 10-9.6 of 10 points, at the medianVirginia median 95.7-

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