Grand River at Ionia

Ranking Statistics

247 score97.7of 100

Michigan median

95.5the median score of 979 stations

Scoring higher

310stations in Michigan

Sharing its score

10ranks 311 to 320

Points deducted

2.31.5 arrival, 0.8 forecast check

Counted at the median

Accuracy, instrument checks, forecast checknot measured at this station; Michigan median 100.0, 100.0, 92.3

Next above

AHCM4rank 310; ahead on 247 score 97.8 against 97.7

Next below

04057800rank 317; behind on median arrival 17 min 36 s against 17 min 48 s

Sharing its rank

5other 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 35100.035.0 of 35 pointsMichigan median 98.2168 of 168 scheduled reports received in 7 days
2. Arrivalweight 1084.88.5 of 10 pointsMichigan median 96.9half its reports arrived within 18 min
3. Continuityweight 10100.010.0 of 10 pointsMichigan median 100.0longest silence 60 min, on a schedule of one report every 60 min
4. Accuracyweight 20-20.0 of 20 points, at the medianMichigan median 100.0-
5. Instrument checksweight 15-15.0 of 15 points, at the medianMichigan median 100.0-
6. Forecast checkweight 10-9.2 of 10 points, at the medianMichigan median 92.3-

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