Shawsheen River at Andover

Ranking Statistics

247 score96.3of 100

Massachusetts median

92.1the median score of 744 stations

Scoring higher

185stations in Massachusetts

Sharing its score

2ranks 186 to 187

Points deducted

3.71.6 arrival, 1.4 forecast check, 0.7 reports received

Counted at the median

Accuracy, instrument checks, forecast checknot measured at this station; Massachusetts median 100.0, 100.0, 85.6

Next above

GRLM3rank 186; ahead on reports received 99.4% against 98.0%

Next below

MA-MD-125rank 188; behind on 247 score 96.3 against 96.2

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 3598.134.3 of 35 pointsMassachusetts median 85.7659 of 672 scheduled reports received in 7 days
2. Arrivalweight 1084.18.4 of 10 pointsMassachusetts median 100.0half its reports arrived within 18 min
3. Continuityweight 10100.010.0 of 10 pointsMassachusetts median 100.0longest silence 45 min, on a schedule of one report every 15 min
4. Accuracyweight 20-20.0 of 20 points, at the medianMassachusetts median 100.0-
5. Instrument checksweight 15-15.0 of 15 points, at the medianMassachusetts median 100.0-
6. Forecast checkweight 10-8.6 of 10 points, at the medianMassachusetts median 85.6-

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