Cahaba River near Helena

Ranking Statistics

247 score97.3of 100

Alabama median

95.6the median score of 798 stations

Scoring higher

271stations in Alabama

Sharing its score

9ranks 272 to 280

Points deducted

2.71.4 arrival, 0.8 reports received, 0.5 forecast check

Counted at the median

Accuracy, instrument checks, forecast checknot measured at this station; Alabama median 100.0, 100.0, 95.4

Next above

GHAA1rank 275; ahead on reports received 99.4% against 97.6%

Next below

MGYA1rank 281; behind on 247 score 97.3 against 97.2

Sharing its rank

4other 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 3597.634.2 of 35 pointsAlabama median 98.8164 of 168 scheduled reports received in 7 days
2. Arrivalweight 1086.48.6 of 10 pointsAlabama median 87.5half its reports arrived within 17 min
3. Continuityweight 10100.010.0 of 10 pointsAlabama 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 medianAlabama median 100.0-
5. Instrument checksweight 15-15.0 of 15 points, at the medianAlabama median 100.0-
6. Forecast checkweight 10-9.5 of 10 points, at the medianAlabama median 95.4-

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