Potomac River AT Edwards Ferry

Ranking Statistics

247 score93.8of 100

Maryland median

89.0the median score of 736 stations

Scoring higher

313stations in Maryland

Sharing its score

2ranks 314 to 315

Points deducted

6.23.5 arrival, 1.7 reports received, 0.8 forecast check, 0.2 accuracy

Counted at the median

Accuracy, instrument checks, forecast checknot measured at this station; Maryland median 99.0, 100.0, 92.1

Next above

PARM2rank 313; ahead on 247 score 94.0 against 93.8

Next below

RSTM2rank 315; behind on reports received 95.2% against 85.7%

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 3595.233.3 of 35 pointsMaryland median 82.1160 of 168 scheduled reports received in 7 days
2. Arrivalweight 1065.16.5 of 10 pointsMaryland median 94.0half its reports arrived within 27 min
3. Continuityweight 10100.010.0 of 10 pointsMaryland median 100.0longest silence 2 h, on a schedule of one report every 60 min
4. Accuracyweight 20-19.8 of 20 points, at the medianMaryland median 99.0-
5. Instrument checksweight 15-15.0 of 15 points, at the medianMaryland median 100.0-
6. Forecast checkweight 10-9.2 of 10 points, at the medianMaryland median 92.1-

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