Winter '20 / '21 - Snow Storm #4: Preliminary STP Verification

Accumulation-weighted SN:H20 (SLR)

Preliminary verification of storm-total snowfalls for THU (18-FEB-21) through SAT (20-FEB-21) from CDUS41 (CLI) ... CXUS51 (CF6) ... METARs ... and PNS bulletins.  Spotty coverage and reporting.

HYA STP estimated from a vicinity report within 2.5 SM of the station carried by the BOXPNS bulletin.  H2O value derived from METAR precipitation groups 7nnnn (24 hour) ... 6nnnn (6 hour) ... and Pnnnn (1 hour).

SBY STP estimated based on METAR 6-hour precipitation report of '60006' and 10:1 SLR.

CON/s Daily Climate Bulletin on THU reported 0.01" liquid but no snowfall total.  Estimated snowfall of 0.1" by applying 10:1 SLR.

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SLR not reported for some stations with measurable snowfall b/c significant liquid and / or freezing precipitation also occurred during the verification period.

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Stations observing at least 0.1":  23 (85%)

Given a station had measurable snowfall; stations observing at least ...
4" - 12 (44%)
6" - 2 (7%)
MAX:  7.6"

MAX snow melt-water (minimum SLR 8:1)
ABE:  0.55"
BDR:  0.51"
HYA:  0.36"

MAX precipitation (frozen + freezing + liquid):
ORF:  1.50"
RDU:  1.20"
RIC:  0.91"

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New daily record(s)
THU ... 18-FEB-21
ABE - 4.4" (3.9"; 2000)
EWR - 4" (3.1"; 2000)
JFK - 4.3" (2.1"; 2000)
ISP - 3.9" (2"; 2014)

Storm total snowfall
Images courtesy NOHRSC
https://www.nohrsc.noaa.gov/interactive/html/map.html

SFC analysis:  18z ... 18-FEB-21
Image courtesy DOC / NOAA / NWS / NCEP / WPC
https://www.wpc.ncep.noaa.gov/html/avnsfc.shtml

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Please report any errors in Comments along with a link to the correct data.
FINAL results expected NLT MON evening.