Powder Mill Scan

Ranking Statistics

247 score92.3of 100

Maryland median

89.0the median score of 736 stations

Scoring higher

340stations in Maryland

Sharing its score

1no other station

Points deducted

7.76.5 arrival, 0.8 forecast check, 0.2 reports received, 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

MD015rank 340; ahead on 247 score 92.5 against 92.3

Next below

MD034rank 342; behind on 247 score 92.3 against 91.8

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 3599.434.8 of 35 pointsMaryland median 82.1167 of 168 scheduled reports received in 7 days
2. Arrivalweight 1035.13.5 of 10 pointsMaryland median 94.0half its reports arrived within 42 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.