Quick math says 82.29 in/hour is 27.43 tips/SECOND over a 5 minute archive period, so that's kinda crazy impossible.
Davis VP2 spec sheet says the max range for rate is 30 in/hour so I can't explain why his db shows many archive periods well over that number. Looking at the archive data for 15 minutes on either side of the maxTime shown in the summary table I'm finding them impossible to believe. *Rainfall* Resolution and Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.01" or 0.2 mm (user-selectable) (1 mm at totals 2000 mm) Daily/Storm Rainfall Range . . . . . . . . . . . . . . . . . . . . . . . 0 to 99.99" (0 to 999.8 mm) Monthly/Yearly/Total Rainfall Range . . . . . . . . . . . . . . . . 0 to 199.99" (0 to 6553 mm) Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . For rain rates up to 10"/hr (250 mm/hr): ±3% of total or ± one tip of the spoon (0.01"/0.2mm), whichever is greater. Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 to 24 seconds Storm Determination Method . . . . . . . . . . . . . . . . . . . . . 0.02" (0.4 mm) begins a storm event, 24 hours without further accumulation ends a storm event Current Display Data . . . . . . . . . . . . . . . . . . . . . . . . . . . Totals for Past 15-min Current Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . Totals for Past 15-min, Past 24-hour, Daily, Monthly, Yearly (start date user- selectable) and Storm (with begin date); Umbrella is displayed when 15-minute total exceeds zero Historical Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . . . Totals for 15-min, Daily, Monthly, Yearly (start date user-selectable) and Storm (with begin and end dates) Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Threshold from Latest Flash Flood (15-min. total, default is 0.50", 12.7 mm), 24-Hour Total, Storm Total, Range for Rain Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 99.99" (0 to 999.7 m *Rain Rate* Resolution and Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.01" or 0.1 mm (user-selectable) (See Figure 1 on page 9) Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0, 0.04"/hr (1 mm/hr) to 30"/hr (0 to 762 mm/hr) Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±5% for rain rates up to 10"/hr (250 mm/hr) Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 to 24 seconds Calculation Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Measures time between successive tips of tipping spoon. Elapsed time greater than 15 minutes or only one tip of the rain collector constitutes a rain rate of zero. Current Display Data . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant Current Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant and 1-min. Reading; Hourly, Daily, Monthly and Yearly High Historical Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-min Reading; Hourly, Daily, Monthly and Yearly Highs Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Threshold from Instant Reading echo "select datetime(dateTime,'unixepoch','localtime'),rainRate from archive where rainRate>10 order by rainRate limit 300 ;" | sqlite3 weewx.sdb 2022-02-22 12:35:00|11.29 2020-07-11 19:45:00|14.77 2021-08-30 22:20:00|15.57 2020-02-17 22:35:00|26.18 2023-08-10 12:10:00|57.6 2019-10-11 22:00:00|64.0 2019-10-11 21:55:00|82.29 2020-05-17 17:05:00|82.29 2021-06-25 02:25:00|82.29 2022-07-08 13:05:00|82.29 2023-08-10 12:05:00|82.29 Here's a couple rain+rainRate instances 2022-02-22 12:25:00|0.0|0.0 2022-02-22 12:30:00|0.0|0.0 2022-02-22 12:35:00|0.03|11.29 <== looks bogus 2022-02-22 12:40:00|0.0|0.09 2022-02-22 12:45:00|0.0|0.05 2020-05-03 02:20:00|0.0|0.05 2020-05-03 02:25:00|0.06|2.35 2020-05-03 02:30:00|0.46|9.44 <== dunno, at least there's a ramp up/down 2020-05-03 02:35:00|0.09|7.02 2020-05-03 02:40:00|0.0|0.1 On Tuesday, November 4, 2025 at 2:33:50 PM UTC-8 Greg Troxel wrote: > vince <[email protected]> writes: > > > I can't come up with math that results in 82.29 in/hour (that's over 2 > > tips/second). I checked your db and it wasn't particularly windy that > day > > either. I can only wildly guess something electrical was going on, maybe > a > > loose plug where the RJ11 plugs into the ISS board, I dunno. > > I have seen rates that are crazy high, maybe even that high. The > problem was indeed electrical connection, or so I concluded. I removed > the rain-ISS cable (pulled out the RJ11) and wiped down and cleaned and > reinserted/removed it a bunch and then things were ok. > > You can get very high rates briefly when the ice melts, but then you > have a total that is not crazy, just a high rate briefly. > -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/weewx-user/a3ac9611-b72a-4682-a898-4d029f6be13an%40googlegroups.com.
