Station Overview Station Location
Station Number CA-SM-20 Latitude 37.56055
Station Name Moss Beach 3.1 NNE Longitude -122.47803
County San Mateo Elevation (ft) 1828



Month 30 Yr Avg by PRISM Total Prcp Sum Days Covered By All Observations Daily Prcp Sum Daily Observation Count Multiday Prcp Sum Days Covered by Multiday Observations Multiday Observation Count Days With Prcp Days With Trace Total Snowfall Days With Snowfall Days With Snow On Ground
Oct 13 1.59 0.04 31 0.00 0 0.04 31 3 0 0 0.0 0 0
Nov 13 3.79 1.22 31 0.00 2 1.22 29 7 0 0 0.0 0 0
Dec 13 7.22 0.32 20 0.31 1 0.01 19 4 1 0 0.0 0 0
Jan 14 6.97 0.07 31 0.02 1 0.05 30 2 1 0 0.0 0 0
Feb 14 7.48 3.25 29 0.55 1 2.70 28 6 1 0 0.0 0 0
March 14 4.90 2.86 19 0.32 1 2.54 18 4 1 0 0.0 0 0
April 14 2.36 1.31 3 0.00 0 1.31 3 2 0 0 0.0 0 0
May 14 1.33 0.00 0 0.00 0 0.00 0 0 0 0 0.0 0 0
June 14 0.28 0.00 0 0.00 0 0.00 0 0 0 0 0.0 0 0
July 14 0.09 0.00 0 0.00 0 0.00 0 0 0 0 0.0 0 0
Aug 14 0.19 0.00 8 0.00 0 0.00 8 0 0 0 0.0 0 0
Sept 14 0.35 0.72 30 0.00 0 0.72 30 3 0 0 0.0 0 0
Water Year Totals: 36.55" 9.79" 202 days 1.20" 6 8.59" 196 days 31 4 days 0 days 0.0" 0 days 0 days



Days in Water Year Cell Color Key
        Daily Observation with Prcp         Missing Day
        Multiday Observation         Daily/Multiday Observation Conflict

Day of Year Daily Prcp Multiday Prcp
10/1/2013 **
10/2/2013 **
10/3/2013 **
10/4/2013 **
10/5/2013 **
10/6/2013 **
10/7/2013 **
10/8/2013 **
10/9/2013 **
10/10/2013 **
10/11/2013 **
10/12/2013 **
10/13/2013 **
10/14/2013 0.04
10/15/2013 **
10/16/2013 **
10/17/2013 0.00
10/18/2013 **
10/19/2013 **
10/20/2013 **
10/21/2013 **
10/22/2013 **
10/23/2013 **
10/24/2013 **
10/25/2013 **
10/26/2013 **
10/27/2013 0.00
10/28/2013 **
10/29/2013 **
10/30/2013 **
10/31/2013 **
11/1/2013 0.01
11/2/2013 **
11/3/2013 0.00
11/4/2013 **
11/5/2013 **
11/6/2013 **
11/7/2013 **
11/8/2013 **
11/9/2013 **
11/10/2013 **
11/11/2013 **
11/12/2013 T
11/13/2013 **
11/14/2013 **
11/15/2013 **
11/16/2013 0.00
11/17/2013 0.00
11/18/2013 **
11/19/2013 **
11/20/2013 **
11/21/2013 **
11/22/2013 1.21
11/23/2013 0.00
11/24/2013 **
11/25/2013 **
11/26/2013 **
11/27/2013 **
11/28/2013 **
11/29/2013 0.00
11/30/2013 **
12/1/2013 0.00
12/2/2013 **
12/3/2013 **
12/4/2013 0.01
12/5/2013 **
12/6/2013 **
12/7/2013 0.31 M
12/8/2013
12/9/2013
12/10/2013
12/11/2013
12/12/2013
12/13/2013
12/14/2013
12/15/2013
12/16/2013
12/17/2013
12/18/2013
12/19/2013
12/20/2013 **
12/21/2013 **
12/22/2013 **
12/23/2013 0.00
12/24/2013 **
12/25/2013 **
12/26/2013 **
12/27/2013 **
12/28/2013 **
12/29/2013 **
12/30/2013 **
12/31/2013 **
Day of YearDaily PrcpMultiday Prcp
1/1/2014 **
1/2/2014 **
1/3/2014 **
1/4/2014 **
1/5/2014 **
1/6/2014 **
1/7/2014 **
1/8/2014 0.02
1/9/2014 **
1/10/2014 **
1/11/2014 0.03
1/12/2014 0.02
1/13/2014 **
1/14/2014 **
1/15/2014 **
1/16/2014 **
1/17/2014 **
1/18/2014 **
1/19/2014 **
1/20/2014 **
1/21/2014 **
1/22/2014 **
1/23/2014 **
1/24/2014 **
1/25/2014 **
1/26/2014 **
1/27/2014 **
1/28/2014 **
1/29/2014 **
1/30/2014 **
1/31/2014 **
2/1/2014 **
2/2/2014 0.78
2/3/2014 **
2/4/2014 **
2/5/2014 T
2/6/2014 **
2/7/2014 **
2/8/2014 **
2/9/2014 1.75
2/10/2014 **
2/11/2014 **
2/12/2014 **
2/13/2014 **
2/14/2014 **
2/15/2014 0.55 M
2/16/2014 **
2/17/2014 0.15
2/18/2014 **
2/19/2014 **
2/20/2014 **
2/21/2014 0.02
2/22/2014 **
2/23/2014 **
2/24/2014 **
2/25/2014 **
2/26/2014 **
2/27/2014 **
2/28/2014 **
3/1/2014 0.90
3/2/2014 0.32
3/3/2014 **
3/4/2014 **
3/5/2014 **
3/6/2014 **
3/7/2014 **
3/8/2014 0.44
3/9/2014
3/10/2014
3/11/2014
3/12/2014
3/13/2014
3/14/2014
3/15/2014
3/16/2014
3/17/2014
3/18/2014
3/19/2014
3/20/2014
3/21/2014
3/22/2014 **
3/23/2014 **
3/24/2014 **
3/25/2014 **
3/26/2014 **
3/27/2014 **
3/28/2014 **
3/29/2014 **
3/30/2014 0.86
3/31/2014 **
Day of YearDaily PrcpMultiday Prcp
4/1/2014 0.86
4/2/2014 **
4/3/2014 0.45
4/4/2014
4/5/2014
4/6/2014
4/7/2014
4/8/2014
4/9/2014
4/10/2014
4/11/2014
4/12/2014
4/13/2014
4/14/2014
4/15/2014
4/16/2014
4/17/2014
4/18/2014
4/19/2014
4/20/2014
4/21/2014
4/22/2014
4/23/2014
4/24/2014
4/25/2014
4/26/2014
4/27/2014
4/28/2014
4/29/2014
4/30/2014
5/1/2014
5/2/2014
5/3/2014
5/4/2014
5/5/2014
5/6/2014
5/7/2014
5/8/2014
5/9/2014
5/10/2014
5/11/2014
5/12/2014
5/13/2014
5/14/2014
5/15/2014
5/16/2014
5/17/2014
5/18/2014
5/19/2014
5/20/2014
5/21/2014
5/22/2014
5/23/2014
5/24/2014
5/25/2014
5/26/2014
5/27/2014
5/28/2014
5/29/2014
5/30/2014
5/31/2014
6/1/2014
6/2/2014
6/3/2014
6/4/2014
6/5/2014
6/6/2014
6/7/2014
6/8/2014
6/9/2014
6/10/2014
6/11/2014
6/12/2014
6/13/2014
6/14/2014
6/15/2014
6/16/2014
6/17/2014
6/18/2014
6/19/2014
6/20/2014
6/21/2014
6/22/2014
6/23/2014
6/24/2014
6/25/2014
6/26/2014
6/27/2014
6/28/2014
6/29/2014
6/30/2014
Day of YearDaily PrcpMultiday Prcp
7/1/2014
7/2/2014
7/3/2014
7/4/2014
7/5/2014
7/6/2014
7/7/2014
7/8/2014
7/9/2014
7/10/2014
7/11/2014
7/12/2014
7/13/2014
7/14/2014
7/15/2014
7/16/2014
7/17/2014
7/18/2014
7/19/2014
7/20/2014
7/21/2014
7/22/2014
7/23/2014
7/24/2014
7/25/2014
7/26/2014
7/27/2014
7/28/2014
7/29/2014
7/30/2014
7/31/2014
8/1/2014
8/2/2014
8/3/2014
8/4/2014
8/5/2014
8/6/2014
8/7/2014
8/8/2014
8/9/2014
8/10/2014
8/11/2014
8/12/2014
8/13/2014
8/14/2014
8/15/2014
8/16/2014
8/17/2014
8/18/2014
8/19/2014
8/20/2014
8/21/2014
8/22/2014
8/23/2014
8/24/2014 **
8/25/2014 **
8/26/2014 **
8/27/2014 **
8/28/2014 **
8/29/2014 **
8/30/2014 **
8/31/2014 **
9/1/2014 **
9/2/2014 **
9/3/2014 **
9/4/2014 **
9/5/2014 **
9/6/2014 **
9/7/2014 **
9/8/2014 **
9/9/2014 **
9/10/2014 **
9/11/2014 **
9/12/2014 **
9/13/2014 **
9/14/2014 0.00
9/15/2014 **
9/16/2014 **
9/17/2014 **
9/18/2014 **
9/19/2014 **
9/20/2014 **
9/21/2014 0.08
9/22/2014 **
9/23/2014 **
9/24/2014 **
9/25/2014 **
9/26/2014 0.64
9/27/2014 **
9/28/2014 **
9/29/2014 **
9/30/2014 **



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
11/17/2013 1:30 PM 0.00 0.0 M M M reported by public; looking forward to some significant rain this week!!
11/23/2013 11:30 AM 0.00 0.0 M M M no accumulation since 11/22 multi-day report
12/7/2013 8:15 AM 0.31 M M M M reported by public; observer reported snow flurries!! for a period of about 2 minutes near obs. time; precip accumulated late PM 12/6 and overnight; this precip report supercedes the MD report of the same period and accounts for the accumulation
1/12/2014 12:00 PM 0.02 M M M M
2/15/2014 12:15 PM 0.55 M M M M reported by public; accumulation probably related to rain late 2/9-10, along with some the morning of 2/14; covered by MD report
3/2/2014 12:30 PM 0.32 M M M M reported by public; accumulated since emptied at 9:15 AM yesterday; 0.32 remains in gauge...



Start Date End Date & Time Duration in Days Precipitation Snow Depth Snow Depth SWE Notes
9/27/2013 10/14/2013 10:30 AM 18 0.04 M M reported by public; accumulated/remaining over 2 weeks; may represent some dew, possibly local drizzle events about 9/30-10/1 + more recently; hopefully not from someone's water bottle...difficult to QC this report. If evap is 0.01 over 2 days, then there may have been as much as 0.11 during the 9/30-10/1 event (?)
10/15/2013 10/17/2013 3:30 PM 3 0.00 M M reported by public; previously reported accumulation (0.04) reduced by evap to 0.02; gauge emptied
10/18/2013 10/27/2013 2:00 PM 10 0.00 M M overcast with clouds brushing the summit today; cleaned the inner cylinder...ready for rain :-)
10/28/2013 11/01/2013 1:30 PM 5 0.01 M M probably accumulated overnight/early 10/29 AM
11/2/2013 11/03/2013 11:30 AM 2 0.00 M M reported by public
11/4/2013 11/10/2013 11:00 AM 7 0.00 M M
11/10/2013 11/12/2013 1:30 PM 3 T M M reported by public; definite accumulation, but less than 0.01, probably from early AM 11/12
11/13/2013 11/16/2013 1:00 PM 4 0.00 M M
11/18/2013 11/22/2013 1:00 PM 5 1.21 M M reported by public 11/22; observers reported a full inner cylinder, but not able to measure overflow due to lock on outer cylinder. 11/23 owner decanted the remainder for a total of 1.21; total accumulated from two storms over 11/19-20.
11/24/2013 11/29/2013 3:30 PM 6 0.00 M M just small flies; otherwise dry
11/30/2013 12/01/2013 12:30 PM 2 0.00 M M reported by public; completes a weak November at about 30% of normal
12/2/2013 12/04/2013 1:15 PM 3 0.01 M M reported by public; probably accumulated during frontal passage overnight 12/2-3
12/5/2013 12/07/2013 8:15 AM 3 M M M reported by public; observer reported snow flurries!! for a period of about 2 minutes near obs. time; precip accumulated late PM 12/6 and overnight; **amount (0.31) accounted for in daily precip report
12/20/2013 12/23/2013 4:15 PM 4 0.00 M M reported by public; dry
12/24/2013 1/08/2014 5:30 PM 16 0.02 M M reported by public; most likely accumulated overnight 1/7-8
1/9/2014 1/11/2014 2:00 PM 3 0.03 M M reported by public; accumulation probably remaining from early AM, 1/8-9
1/13/2014 2/02/2014 4:00 PM 21 0.78 M M most accumulated today, but a few hundredths may be from a few days ago
2/3/2014 2/05/2014 4:45 AM 3 T M M reported by public
2/6/2014 2/09/2014 3:00 PM 4 1.75 M M much less than expected; nearby stations have reported between 3 and 6 inches over the same period...wondering if any visitors emptied the inner cylinder without reporting...if not, this is an extremely anomalous accumulation.
2/10/2014 2/15/2014 12:15 PM 6 M M M 0.55 reported by public; accumulation probably related to rain late 2/9-10, along with some on morning of 2/14; accounted for in daily report
2/16/2014 2/17/2014 5:30 PM 2 0.15 M M reported by public; 0.55 reported for the second time in two days; still not emptied; **then another observer reported 0.70 which represented the +0.15 that fell overnight 2/15-16
2/18/2014 2/21/2014 2:00 PM 4 0.02 M M reported by public
2/22/2014 3/01/2014 9:15 AM 8 0.90 M M much less than expected, as compared to nearby stations...
3/3/2014 3/08/2014 2:30 PM 6 0.44 M M reported by public; 0.76 observed, minus 0.32 remaining since 3/2 report; still not emptied...
3/22/2014 3/29/2014 6:00 PM 8 0.34 M M most probably accumulated on 3/26
3/29/2014 3/30/2014 1:15 PM 2 0.86 M M reported by public; probably accumulated during the day 3/29
3/31/2014 4/01/2014 9:15 AM 2 0.86 M M
4/2/2014 4/03/2014 1:30 PM 2 0.45 M M reported by public; probably accumulated during 4/1; thunderstorms locally; gauge not emptied*
8/24/2014 9/14/2014 11:45 AM 22 0.00 M M 0.09 reported on 8/23; was not emptied; so apparently 0.09 evaporated from the inner cylinder since that time; consistent with previous estimates of about 0.01 reduction every 2 days; cleaned gauge and prep'd for the rains to come
9/15/2014 9/21/2014 1:40 PM 7 0.08 M M reported by public; most probably from showers on 9/18; first reported as 0.09, but photo/report the following day showed it to be 0.08
9/22/2014 9/26/2014 12:00 PM 5 0.64 M M possibly as much as 0.66, depending on prior evaporation of 0.08 left in cylinder
9/27/2014 10/10/2014 5:15 PM 14 0.00 M M observed by owner; 0.59 in gauge; previous photo report of 0.72 on 10/26; so EVAP reduction of 0.13 from the inner cylinder over 15 days; high compared to previous estimates of 0.05/day during usual cool/windy weather; has been very warm and dry.



Observation Date Observation Time Notes Largest Stone Size Average Stone Size Smallest Stone Size Stone Consistency Duration Minutes Durration Accuracy Damage Timing More Rain than Hail Hail Started Largest Hail Started Angle of Impact Number of Stones on Pad Distance Between Stones on Pad Depth of Stones on Ground