MEMORANDUM. Background and Metadata. 29 April 2013
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1 MEMORANDUM From: Karin Gleason, Climate Monitoring Branch, CSMD, NCDC To: Thomas R. Karl, Director, NCDC Subject: SCEC Decision: New record 24-hour snowfall for Connecticut 29 April 2013 On 24 April, 2013, the State Climate Extremes Committee (SCEC) convened via teleconference to evaluate the validity of an apparent 24-hour snowfall record for the State of Connecticut. The SCEC examined the 8-9 February hour snowfall total of 36 inches at the Cooperative Observer station in Ansonia, CT (COOP identifier ). The SCEC examined several factors surrounding the value (intrinsic and extrinsic validity, methods and practices of observation, and comparison to the accepted record for Connecticut). The SCEC voted unanimously (4-0) to accept the value. I request that the NCDC Director approve the SCEC s decision and recognize the 36 inch 24-hour snowfall total which occurred between 7:00am EST on 8 February 2013 and 7:00am EST on 9 February 2013 as the new Connecticut state record for 24-hour snowfall. Background and Metadata Ansonia 1 NE (ANSC3) is located in New Haven County, CT at , , with an elevation of 153 feet. The Cooperative station number is Figure 1 shows the location of the site relative to the state of Connecticut and the Tri-State Region. Final Approval: Tom Karl, 1 May 2013 Figure 1. Map of Tri-State region with Ansonia, CT denoted by the red A pin.
2 The station began as an institutional site on 1 April 1941 and became an individual site on 1 December Michael S. Witek has been the observer at this site since that change (nearly 30 years). The observer s reporting time is at 7am EST. The site has a wide open exposure with no significant obstructions which would prohibit an accurate catch of snowfall. Figure 2 shows the area where observations are taken. Figure 2. Ansonia Cooperative Observer property, where multiple snow measurements were taken on 9 February Meteorological / Climatological Feasibility The 36 inch snowfall recorded at the Ansonia Cooperative station was the result of a powerful blizzard which impacted the Tri-State Region on 8-9 February When the storm subsided, in excess of 30 inches of snow had been reported at numerous locations across Connecticut. Figure 3 shows a preliminary map of the snowfall distribution for the two-day event. A listing of preliminary snowfall totals for this event is also included in Appendix A. The 36 inch snowfall from ANSC3 was not included in the preliminary listing or map because the data arrived after the products were created. Adding them at a later time could have confused the public due to subsequent snowfall events across the New York, NY
3 County Warning Area (OKX). The Observing Program Leader at OKX discussed the observation over the phone with the observer, with the observer confirming that no additional snow fell after 7am, only blowing snow was observed. In addition, the observer verified that the measurements were taken in accordance with established NWS Coop guidelines (i.e. multiple measurements taken on the property with the average used). Appendix B documents the B-91 observer form illustrating the snowfall record (B- 91) for the month of February 2013 at the Ansonia, CT Cooperative station. Figure 3. Preliminary snowfall accumulations for the Northeast from the 8-9 February 2013 snow storm.
4 The observation at ANSC3 is supported by surrounding observations as well as radar (Figure 4), which indicated this event was highly-convective with sustained and heavy snowfall rates. Further adding to the plausibility of this record event, NCDC s GHCN quality control routine (spatial analysis) compared this value to neighboring values from other official reporting sites and validated it. Figure 4. Radar image showing the intensity of the snowfall over Connecticut the evening of 8 February The Ansonia Cooperative site had the highest total of any NWS COOP or NWS Climate Site in the state during this event. There were four reports of storm total snowfall in excess of the ANSC3 measurement, however, two of these reports were from the general public, and two were from Skywarn Spotters. The level of integrity of these two sources (public and Skywarn) does not meet the level required for an official climate record. Evaluation of Existing Record The NCDC-recognized state record for 24-hour snowfall of 30 inches occurred on 10 February 1969 at Falls Village (Figure 5). Since this value has already gone through extensive evaluation by NCDC, further evaluation of this record is unnecessary.
5 Figure 5. Connecticut 24-hour snowfall record as obtained from the NCDC website on 25 April Conclusion The SCEC voted unanimously (4-0) to recognize the 36 inch 24-hour snowfall total from Ansonia, Connecticut on 8-9 February 2013 as the state record for 24-hour snowfall in Connecticut. Acknowledgements NCDC would like to express its thanks for the excellent work from the New York NWS office in collecting data and providing a comprehensive and compelling summary. State Climate Extremes ad hoc Committee Members: James Connolly, General Forecaster, National Weather Service, New York, NY [voting] Kevin Murray, Public Information Officer, NWS Eastern Region Headquarters [voting] Keith L. Eggleston, Regional Climatologist, Northeast Regional Climate Center [voting] Karin Gleason, Climatologist, Climate Monitoring Branch, National Climatic Data Center [voting] Bryant Korzeniewski, Ingest and Analysis Branch, National Climatic Data Center
6 Appendix A Preliminary storm total snowfall values for Connecticut. Highlighted values are equal to or greater than the previously established 24-hour snowfall record of 30 inches: ********************STORM TOTAL SNOWFALL******************** LOCATION STORM TOTAL TIME/DATE COMMENTS SNOWFALL OF /INCHES/ MEASUREMENT CONNECTICUT...FAIRFIELD COUNTY... FAIRFIELD AM 2/09 PUBLIC STRATFORD AM 2/09 PUBLIC MONROE AM 2/09 SKYWARN SPOTTER BRIDGEPORT AM 2/09 COOP OBSERVER SHELTON AM 2/09 PUBLIC WESTON AM 2/09 SKYWARN SPOTTER WESTPORT AM 2/09 PUBLIC GREENWICH AM 2/09 PUBLIC DARIEN AM 2/09 PUBLIC NORWALK AM 2/09 PUBLIC ROXBURY AM 2/09 SKYWARN SPOTTER NEW CANAAN AM 2/09 CT DOT DANBURY PM 2/09 CT DOT STAMFORD AM 2/09 PUBLIC NEWTOWN AM 2/09 PUBLIC BETHEL AM 2/09 SKYWARN SPOTTER RIDGEFIELD AM 2/09 PUBLIC...MIDDLESEX COUNTY... EAST HADDAM AM 2/09 PUBLIC OLD SAYBROOK PM 2/09 CT DOT CLINTON AM 2/09 PUBLIC HADDAM PM 2/09 CT DOT HIGGANUM AM 2/09 AMATEUR RADIO CROMWELL AM 2/09 AMATEUR RADIO MIDDLETOWN PM 2/09 SKYWARN SPOTTER...NEW HAVEN COUNTY... HAMDEN PM 2/09 PUBLIC MILFORD AM 2/09 PUBLIC CLINTONVILLE AM 2/09 SKYWARN SPOTTER OXFORD AM 2/09 SKYWARN SPOTTER NORTH BRANFORD AM 2/09 PUBLIC MERIDEN PM 2/09 PUBLIC YALESVILLE AM 2/09 SKYWARN SPOTTER WALLINGFORD AM 2/09 PUBLIC NEW HAVEN AM 2/09 CT DOT WEST HAVEN AM 2/09 PUBLIC NORTHFORD AM 2/09 SKYWARN SPOTTER WOLCOTT AM 2/09 SKYWARN SPOTTER EAST HAVEN AM 2/09 SKYWARN SPOTTER GUILFORD AM 2/09 BROADCAST MEDIA NORTH GUILFORD AM 2/09 SKYWARN SPOTTER WATERBURY AM 2/09 PUBLIC MADISON AM 2/09 PUBLIC
7 Appendix A-1 Continued NAUGATUCK AM 2/09 PUBLIC NORTH HAVEN AM 2/09 SKYWARN SPOTTER BRANFORD AM 2/09 PUBLIC SOUTHBURY AM 2/09 SKYWARN SPOTTER NORTH BRANDFORD AM 2/09 PUBLIC BEACON FALLS PM 2/09 CT DOT...NEW LONDON COUNTY... COLCHESTER PM 2/09 CT DOT GILMAN AM 2/09 PUBLIC NORWICH AM 2/09 CT DOT LISBON AM 2/09 SKYWARN SPOTTER GALES FERRY AM 2/09 SKYWARN SPOTTER OLD LYME PM 2/09 PUBLIC LEDYARD CENTER AM 2/09 SKYWARN SPOTTER MYSTIC SEAPORT AM 2/09 NWS EMPLOYEE STONINGTON AM 2/09 SKYWARN SPOTTER...HARTFORD COUNTY... GLASTONBURY PM 2/09 GENERAL PUBLIC MANCHESTER AM 2/09 TRAINED SPOTTER WEATOGUE AM 2/09 HAM RADIO NEWINGTON PM 2/09 TRAINED SPOTTER FARMINGTON AM 2/09 HAM RADIO GRANBY AM 2/09 RETIRED NWS EMPLOYEE SOUTH GLASTONBURY PM 2/09 TRAINED SPOTTER BURLINGTON AM 2/09 TRAINED SPOTTER HARTFORD AM 2/09 HAM RADIO CANTON AM 2/09 TRAINED SPOTTER NORTH GRANBY AM 2/09 TRAINED SPOTTER AVON AM 2/09 NONE BRISTOL AM 2/09 TRAINED SPOTTER SIMSBURY AM 2/09 HAM RADIO COLLINSVILLE AM 2/09 TRAINED SPOTTER WINDSOR AM 2/09 COCORAHS SOUTH WINDSOR PM 2/09 TRAINED SPOTTER WINDSOR LOCKS AM 2/09 BRADLEY AIRPORT ASHFORD AM 2/09 HAM RADIO EAST HARTFORD AM 2/09 HAM RADIO ENFIELD AM 2/09 HAM RADIO...TOLLAND COUNTY... COVENTRY AM 2/09 TRAINED SPOTTER STAFFORDVILLE PM 2/09 CO-OP OBSERVER TOLLAND AM 2/09 GENERAL PUBLIC MANSFIELD DEPOT PM 2/09 HAM RADIO STAFFORD SPRINGS PM 2/09 TRAINED SPOTTER SOMERS AM 2/09 TRAINED SPOTTER VERNON AM 2/09 HAM RADIO...WINDHAM COUNTY... EAST KILLINGLY AM 2/09 TRAINED SPOTTER WOODSTOCK AM 2/09 TRAINED SPOTTER THOMPSON AM 2/09 TRAINED SPOTTER HAMPTON AM 2/09 CO-OP OBSERVER ASHFORD AM 2/09 GENERAL PUBLIC MOOSUP AM 2/09 GENERAL PUBLIC DANIELSON AM 2/09 HAM RADIO POMFRET CENTER AM 2/09 TRAINED SPOTTER...LITCHFIELD COUNTY...
8 NEW HARTFORD AM 2/09 SPOTTER BAKERSVILLE AM 2/09 CO-OP OBSERVER TORRINGTON AM 2/09 FACEBOOK WINSTED AM 2/09 SPOTTER NEW PRESTON AM 2/09 PUBLIC THOMASTON AM 2/09 CT DOT HARWINTON AM 2/09 AMATEUR RADIO WINCHESTER CENTER AM 2/09 DEPT OF HIGHWAYS ROXBURY AM 2/09 AMATEUR RADIO NORFOLK AM 2/09 CO-OP OBSERVER LITCHFIELD AM 2/09 CT DOT CORNWALL AM 2/09 AMATEUR RADIO NORTH CANAAN AM 2/09 CT DOT Appendix B B-91 form indicating the daily snowfall amounts for the month of February 2013 in Ansonia, CT (060128):
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