- Stage now
- 0.49 ftreported Oct 16, 12:11 AM EDT
- 24 hour change
- -
- Elevation
- 236 ftabove sea level
- County
- Loudoun County
- Position
- 39.1675° N, 77.5358° W
- Record since
- 2010
Water level
Limestone Branch at Leesburg
Stage is the height of the water's surface above the gauge's own fixed zero, in feet, not the depth of the water. Every point drawn is a reading the gauge sent, at the time it sent it.
How it reports
- Schedule
- every 15 minon the hour's :11, :26, :41 and :56
- Reports received, 24 hours
- 94 of 9697.9% of its schedule
- Reports received, 7 days
- 668 of 67299.4% of its schedule
- Longest silence, 7 days
- 32 minfrom Oct 15, 11:56 PM
- Latest report
- Oct 15, 11:56 PMlocal time
- Time to reach Storm Station
- 17 min9 in 10 within 18 min
From Storm Station's own record of every report it heard from this station.
Its schedule is one report every 15 min, 96 in 24 hours. Two reports in the same 15 min count as one received.
Ranking Statistics
247 score97.9of 100
- Virginia median
- 95.9the median score of 1,541 stations
- Scoring higher
- 495stations in Virginia
- Sharing its score
- 13ranks 496 to 508
- Points deducted
- 2.11.4 arrival, 0.4 forecast check, 0.3 reports received
- Counted at the median
- Accuracy, instrument checks, forecast checknot measured at this station; Virginia median 100.0, 100.0, 96.5
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.
- Reports receivedweight 3599.134.7 of 35 pointsVirginia median 97.9666 of 672 scheduled reports received in 7 days
- Arrivalweight 1085.68.6 of 10 pointsVirginia median 92.7half its reports arrived within 17 min
- Continuityweight 10100.010.0 of 10 pointsVirginia median 100.0longest silence 30 min, on a schedule of one report every 15 min
- Accuracyweight 20-20.0 of 20 points, at the medianVirginia median 100.0-
- Instrument checksweight 15-15.0 of 15 points, at the medianVirginia median 100.0-
- Forecast checkweight 10-9.7 of 10 points, at the medianVirginia median 96.5-
The score is the weighted mean of its six parts, from the last 7 days. How a station is ranked sets out each part.
How each part is scored
- Reports received
- Full marks for every scheduled report received, none for none, in proportion between
- Arrival
- Full marks for a median arrival within 10 min, none at 60 min
- Continuity
- Full marks for a longest silence of 3 reports or less (45 min), none for 72 (18 h)
- Accuracy
- Full marks within 1.5 °F of its reference, typically, none beyond 8.0 °F
- Instrument checks
- Full marks for no reading failed, none for 5 per cent or more
- Forecast check
- Full marks within 2 °F of the forecast on average, none at 8 °F
Near Limestone Branch at Leesburg
Gauges
Weather instruments
How to read a gauge
A gauge measures the height of the water where it stands, its stage, in feet above a fixed mark at that gauge. Two gauges' stages are not comparable: each is measured from its own mark, and a reservoir's is often its height above sea level.
The stage shown is the latest the gauge reported, with the time it reported it. Storm Station hears each gauge on its own schedule and ranks it among its state's stations by its 247 score, how reliably it reports and how its readings hold up: that is its 247 rank.