Merrimack River at Lawrence

Ranking Statistics

247 score95.8of 100

Massachusetts median

92.1the median score of 744 stations

Scoring higher

210stations in Massachusetts

Sharing its score

39ranks 211 to 249

Points deducted

4.22.5 arrival, 1.4 forecast check, 0.2 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

WLMM3rank 236; ahead on longest silence 105 min against 120 min

Next below

01095375rank 245; behind on median arrival 22 min 36 s against 22 min 48 s

Sharing its rank

7other 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 3599.434.8 of 35 pointsMassachusetts median 85.7167 of 168 scheduled reports received in 7 days
2. Arrivalweight 1074.87.5 of 10 pointsMassachusetts median 100.0half its reports arrived within 23 min
3. Continuityweight 10100.010.0 of 10 pointsMassachusetts median 100.0longest silence 2 h, on a schedule of one report every 60 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.