Year End Summary for 2021
YEAR END SUMMARY STATION NAME: Whitewater River nr Beaver, CSAH30 STATION NUMBER: H40016001 YEAR: 2021 PREPARED BY: Jacob Kolke; jacob.kolke@state.mn.us CLIMATE SUMMARY: Division 9, 2021: After a generally mild winter with normal to below-normal snowfall, warm and dry conditions persisted during the May-through-October liquid precipitation season, leading to some drought designations. Precipitation from May through October averaged about 85% of normal, or just under 4 inches below normal. May through July was dry, with an average of just under 11 inches of rain falling over the 3-month period (normal would have been just under 14.5 inches). June had bouts of extreme heat, and May through October averaged just 2.5 degrees F above normal. Normal to above-normal precipitation during late summer and autumn helped drought conditions improve, and areas near the Mississippi River spent little time in official drought designations. Heavy rain fell on August 26-27, with 3-5 inches in many areas. Mean temperatures fell below freezing in early November, with accumulating snows most areas by early December. STATION OPERATION SUMMARY: This station operates year-round, but precipitation is only monitored during the liquid precipitation season. Is this site monitored year round? YES Open water dates - estimated Ice out and Ice in: Few periods with minor ice impacts occurred during the monitoring season. These were: 1/22/2021 - 1/28/2021 and 2/5/2021 - 2/22/2021. Main ice in occurred at the end of the monitoring season on 12/29/2021. Summary of equipment - related factors that impacted data collection: Removed 2/7/2021 - 2/22/2021 level data due to heavy ice impacts resulting in erroneous data collection. No other equipment issues were noted for the monitoring season. DISCHARGE SUMMARY: Number of flow measurements for monitoring season: Eight. All were open water measurements. Was the full range of flows measured for the season? NO. Measured discharges ranged from 139 to 191 cfs while calculated discharges ranged from 132 to 449 cfs. Was a new rating developed? YES. Measurements showed a fairly constant deposition trend compared to the previous rating. Used a regression to reshape lower end of the rating. General summary of control changes/shifts needed: Minor deposition was in place during the early part of year in January and was removed during ice out in mid-to-late February. Minor deposition built up again in early August and lasted through early November. Ice started to form in late December and impacted the control into 2022. Quality of computed daily discharges: Most of the year was coded fair with about a tenth coded estimated due to low flows and another tenth coded ice. PRECIPITATION DATA OVERVIEW: Was precipitation data collected at this site? YES Climatological liquid precipitation period: 5/1/2021 - 10/31/2021 Was there a complete and acceptable precipitation record for this period? NO. Removed data for 7/6/2021. Bucket recorded much less than the gridded value and was removed per State Climatology Office guidance. Rest of the year was accurate and accepted.