Station Overview Station Location
Station Number CO-BO-457 Latitude 40.03176389
Station Name Boulder 0.7 ENE Longitude -105.23972222
County Boulder Elevation (ft) 5275



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 17 1.21 0.00 0 0.00 0 0.00 0 0 0 0 0.0 0 0
Nov 17 0.92 0.00 7 0.00 7 0.00 0 0 0 1 0.0 0 0
Dec 17 0.68 0.24 6 0.24 6 0.00 0 0 3 1 2.7 4 4
Jan 18 0.55 0.69 26 0.69 26 0.00 0 0 3 3 7.4 4 7
Feb 18 0.58 0.88 21 0.88 21 0.00 0 0 8 4 13.0 8 13
March 18 1.71 2.18 29 2.18 29 0.00 0 0 6 0 3.0 3 1
April 18 2.22 0.61 20 0.61 20 0.00 0 0 6 1 0.0 0 0
May 18 2.51 4.95 29 4.95 29 0.00 0 0 13 1 0.0 0 0
June 18 2.11 0.02 10 0.02 10 0.00 0 0 1 0 0.0 0 0
July 18 1.79 1.77 24 0.92 16 0.85 8 2 7 1 0.0 0 0
Aug 18 1.74 0.59 31 0.02 12 0.57 19 1 1 0 0.0 0 0
Sept 18 1.61 0.94 27 0.94 21 0.00 6 1 5 0 0.0 0 0
Water Year Totals: 17.63" 12.87" 230 days 11.45" 197 1.42" 33 days 4 53 days 12 days 26.1" 19 days 25 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
10/1/2017
10/2/2017
10/3/2017
10/4/2017
10/5/2017
10/6/2017
10/7/2017
10/8/2017
10/9/2017
10/10/2017
10/11/2017
10/12/2017
10/13/2017
10/14/2017
10/15/2017
10/16/2017
10/17/2017
10/18/2017
10/19/2017
10/20/2017
10/21/2017
10/22/2017
10/23/2017
10/24/2017
10/25/2017
10/26/2017
10/27/2017
10/28/2017
10/29/2017
10/30/2017
10/31/2017
11/1/2017
11/2/2017
11/3/2017
11/4/2017
11/5/2017
11/6/2017
11/7/2017
11/8/2017
11/9/2017
11/10/2017
11/11/2017
11/12/2017
11/13/2017
11/14/2017
11/15/2017
11/16/2017
11/17/2017
11/18/2017
11/19/2017
11/20/2017 0.00
11/21/2017 0.00
11/22/2017 T
11/23/2017 0.00
11/24/2017 0.00
11/25/2017 0.00
11/26/2017 0.00
11/27/2017
11/28/2017
11/29/2017
11/30/2017
12/1/2017
12/2/2017
12/3/2017
12/4/2017
12/5/2017
12/6/2017
12/7/2017
12/8/2017
12/9/2017
12/10/2017 0.00
12/11/2017
12/12/2017
12/13/2017
12/14/2017
12/15/2017
12/16/2017
12/17/2017
12/18/2017
12/19/2017
12/20/2017
12/21/2017 0.16
12/22/2017 0.07
12/23/2017
12/24/2017
12/25/2017
12/26/2017
12/27/2017
12/28/2017
12/29/2017 0.00
12/30/2017 0.01
12/31/2017 T
Day of YearDaily PrcpMultiday Prcp
1/1/2018 T
1/2/2018 0.00
1/3/2018 0.00
1/4/2018 0.00
1/5/2018 0.00
1/6/2018 0.00
1/7/2018 0.00
1/8/2018 0.00
1/9/2018 0.00
1/10/2018 0.00
1/11/2018 T
1/12/2018 0.00
1/13/2018 0.00
1/14/2018 0.00
1/15/2018 T
1/16/2018 0.09
1/17/2018 0.00
1/18/2018 0.00
1/19/2018 0.00
1/20/2018 0.00
1/21/2018 0.32
1/22/2018 0.28
1/23/2018 0.00
1/24/2018
1/25/2018 0.00
1/26/2018 0.00
1/27/2018
1/28/2018
1/29/2018
1/30/2018
1/31/2018 0.00
2/1/2018 0.01
2/2/2018 0.03
2/3/2018 0.00
2/4/2018 T
2/5/2018 T
2/6/2018 T
2/7/2018
2/8/2018 0.00
2/9/2018 0.00
2/10/2018 0.09
2/11/2018 0.08
2/12/2018 0.00
2/13/2018
2/14/2018
2/15/2018
2/16/2018 0.02
2/17/2018 0.00
2/18/2018 0.00
2/19/2018 0.02
2/20/2018 0.48
2/21/2018 0.00
2/22/2018 0.00
2/23/2018 0.00
2/24/2018 0.15
2/25/2018 T
2/26/2018
2/27/2018
2/28/2018
3/1/2018 0.00
3/2/2018 0.00
3/3/2018 0.00
3/4/2018 0.00
3/5/2018 0.00
3/6/2018 0.00
3/7/2018 0.00
3/8/2018 0.00
3/9/2018 0.00
3/10/2018 0.00
3/11/2018 0.00
3/12/2018
3/13/2018
3/14/2018 0.00
3/15/2018 0.00
3/16/2018 0.14
3/17/2018 0.00
3/18/2018 0.00
3/19/2018 0.71
3/20/2018 0.00
3/21/2018 0.00
3/22/2018 0.00
3/23/2018 0.00
3/24/2018 0.00
3/25/2018 0.00
3/26/2018 0.07
3/27/2018 0.72
3/28/2018 0.00
3/29/2018 0.46
3/30/2018 0.08
3/31/2018 0.00
Day of YearDaily PrcpMultiday Prcp
4/1/2018 0.03
4/2/2018 0.01
4/3/2018 0.00
4/4/2018 0.00
4/5/2018 0.00
4/6/2018 0.00
4/7/2018
4/8/2018 0.00
4/9/2018 T
4/10/2018 0.05
4/11/2018 0.00
4/12/2018 0.00
4/13/2018
4/14/2018
4/15/2018
4/16/2018
4/17/2018
4/18/2018
4/19/2018
4/20/2018 0.00
4/21/2018 0.24
4/22/2018 0.08
4/23/2018 0.00
4/24/2018 0.20
4/25/2018
4/26/2018
4/27/2018 0.00
4/28/2018 0.00
4/29/2018 0.00
4/30/2018 0.00
5/1/2018 0.00
5/2/2018 T
5/3/2018 0.99
5/4/2018 0.56
5/5/2018 0.02
5/6/2018 0.00
5/7/2018 0.00
5/8/2018 0.00
5/9/2018 0.00
5/10/2018 0.00
5/11/2018 0.00
5/12/2018 0.16
5/13/2018 0.22
5/14/2018 0.57
5/15/2018 0.02
5/16/2018 0.00
5/17/2018 0.00
5/18/2018 0.00
5/19/2018 1.94
5/20/2018
5/21/2018
5/22/2018 0.00
5/23/2018 0.13
5/24/2018 0.12
5/25/2018 0.01
5/26/2018 0.00
5/27/2018 0.00
5/28/2018 0.00
5/29/2018 0.05
5/30/2018 0.00
5/31/2018 0.16
6/1/2018 0.02
6/2/2018 0.00
6/3/2018
6/4/2018 0.00
6/5/2018 0.00
6/6/2018 0.00
6/7/2018 0.00
6/8/2018 0.00
6/9/2018 0.00
6/10/2018 0.00
6/11/2018 0.00
6/12/2018
6/13/2018
6/14/2018
6/15/2018
6/16/2018
6/17/2018
6/18/2018
6/19/2018
6/20/2018
6/21/2018
6/22/2018
6/23/2018
6/24/2018
6/25/2018
6/26/2018
6/27/2018
6/28/2018
6/29/2018
6/30/2018
Day of YearDaily PrcpMultiday Prcp
7/1/2018
7/2/2018
7/3/2018
7/4/2018
7/5/2018
7/6/2018
7/7/2018 0.00
7/8/2018 0.00
7/9/2018 0.00
7/10/2018 0.00
7/11/2018 0.00
7/12/2018 **
7/13/2018 0.03
7/14/2018 0.00
7/15/2018 0.00
7/16/2018 0.37
7/17/2018 0.01
7/18/2018 0.01
7/19/2018 **
7/20/2018 **
7/21/2018 **
7/22/2018 **
7/23/2018 **
7/24/2018 0.82
7/25/2018 T
7/26/2018 0.45
7/27/2018
7/28/2018 0.03
7/29/2018 0.02
7/30/2018 0.03
7/31/2018 0.00
8/1/2018 0.00
8/2/2018 0.00
8/3/2018 **
8/4/2018 **
8/5/2018 **
8/6/2018 **
8/7/2018 **
8/8/2018 **
8/9/2018 **
8/10/2018 **
8/11/2018 **
8/12/2018 **
8/13/2018 **
8/14/2018 **
8/15/2018 **
8/16/2018 **
8/17/2018 **
8/18/2018 **
8/19/2018 **
8/20/2018 **
8/21/2018 0.57
8/22/2018 0.02
8/23/2018 0.00
8/24/2018 0.00
8/25/2018 0.00
8/26/2018 0.00
8/27/2018 0.00
8/28/2018 0.00
8/29/2018 0.00
8/30/2018 0.00
8/31/2018 0.00
9/1/2018 0.00
9/2/2018 0.00
9/3/2018 0.00
9/4/2018 0.00
9/5/2018 0.68
9/6/2018 0.05
9/7/2018 0.15
9/8/2018 0.01
9/9/2018 0.00
9/10/2018 0.00
9/11/2018 0.00
9/12/2018 0.00
9/13/2018 **
9/14/2018 **
9/15/2018 **
9/16/2018 **
9/17/2018 **
9/18/2018 0.00
9/19/2018 0.00
9/20/2018 0.05
9/21/2018 0.00
9/22/2018 0.00
9/23/2018 0.00
9/24/2018
9/25/2018 0.00
9/26/2018 0.00
9/27/2018
9/28/2018 0.00
9/29/2018
9/30/2018 0.00



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
11/20/2017 7:00 AM 0.00 0.0 M M M
11/21/2017 7:30 AM 0.00 0.0 M M M
11/22/2017 7:00 AM T M M M M
11/23/2017 7:00 AM 0.00 0.0 M M M
11/24/2017 7:00 AM 0.00 0.0 M M M
11/25/2017 7:00 AM 0.00 0.0 M M M
11/26/2017 7:00 AM 0.00 0.0 M M M
12/10/2017 7:00 AM 0.00 0.0 M M M
12/21/2017 7:30 AM 0.16 1.2 M 1.2 M New Snowfall - 1.2 inches measured at various points - not on snowboard Total Snowfall - 1.2 inches
12/22/2017 8:30 AM 0.07 0.8 M 2.1 M
12/29/2017 7:00 AM 0.00 0.0 M M M
12/30/2017 7:00 AM 0.01 0.6 M 0.6 M Snowing very light at time of observation.
12/31/2017 7:00 AM T 0.1 M 0.1 M Light dry snow yesterday after measurement until 9am - trace amount. New snow melted during day - Light snow at time of measurement-trace amount
1/1/2018 7:00 AM T 0.1 M 0.0 M
1/2/2018 7:00 AM 0.00 0.0 M 0.0 M
1/3/2018 7:00 AM 0.00 0.0 M 0.0 M
1/4/2018 7:00 AM 0.00 0.0 M M M
1/5/2018 7:00 AM 0.00 0.0 M M M
1/6/2018 7:00 AM 0.00 0.0 M M M
1/7/2018 7:00 AM 0.00 0.0 M M M
1/8/2018 7:00 AM 0.00 0.0 M M M
1/9/2018 7:00 AM 0.00 0.0 M M M
1/10/2018 7:00 AM 0.00 0.0 M M M
1/11/2018 7:00 AM T M M M M
1/12/2018 7:00 AM 0.00 0.0 M M M
1/13/2018 7:00 AM 0.00 0.0 M M M
1/14/2018 7:00 AM 0.00 0.0 M M M
1/15/2018 7:00 AM T M M M M Thin layer ice on the ground. Very light dry snow falling at time of observation.
1/16/2018 7:00 AM 0.09 2.6 M 2.6 M
1/17/2018 7:00 AM 0.00 0.0 M 1.2 M Mostly the ground is covered with snow with Patches of Grass. Snow up to 1.2 inches deep.
1/18/2018 7:00 AM 0.00 0.0 M M M Patches of snow mostly on north facing surfaces
1/19/2018 8:00 AM 0.00 0.0 M M M Small patches of snow on north facing slopes.
1/20/2018 7:00 AM 0.00 0.0 M M M
1/21/2018 7:15 AM 0.32 3.0 M 3.0 M Rain started around 7pm turned to sleet around 10 snow started around 1130pm. Snowing at time of observation
1/22/2018 7:00 AM 0.28 1.7 M 3.7 M
1/23/2018 7:00 AM 0.00 0.0 M 2.8 M
1/25/2018 7:00 AM 0.00 0.0 M 2.2 M
1/26/2018 7:00 AM 0.00 0.0 M 2.1 M Snow in patches
1/31/2018 8:30 AM 0.00 0.0 M M M
2/1/2018 7:00 AM 0.01 0.3 M 0.3 M
2/2/2018 7:00 AM 0.03 0.1 M 0.3 M
2/3/2018 7:00 AM 0.00 0.0 M M M
2/4/2018 7:00 AM T M M M M Sleeting - ground is icy. Frozen fog
2/5/2018 7:00 AM T M M M M Light rain started at time of observation
2/6/2018 7:00 AM T M M M M Slight dusting of snow on the ground.
2/8/2018 7:00 AM 0.00 0.0 M M M
2/9/2018 7:00 AM 0.00 0.0 M M M Fog - surfaces frosty
2/10/2018 7:30 AM 0.09 1.5 M 1.5 M Light snow falling
2/11/2018 7:00 AM 0.08 1.0 M 2.3 M
2/12/2018 7:00 AM 0.00 0.0 M 0.5 M Very light snow falling at time of observation.
2/16/2018 7:30 AM 0.02 0.5 M 0.5 M
2/17/2018 7:00 AM 0.00 0.0 M M M
2/18/2018 7:00 AM 0.00 0.0 M M M
2/19/2018 7:00 AM 0.02 0.7 M 0.7 M Light snow falling
2/20/2018 7:30 AM 0.48 6.3 M 6.3 M
2/21/2018 7:00 AM 0.00 0.0 M 4.6 M
2/22/2018 7:00 AM 0.00 0.0 M 3.7 M
2/23/2018 7:00 AM 0.00 0.0 M 3.1 M
2/24/2018 7:15 AM 0.15 2.6 M 5.0 M
2/25/2018 7:00 AM T M M 2.5 M
3/1/2018 7:30 AM 0.00 0.0 M M M
3/2/2018 7:00 AM 0.00 0.0 M M M
3/3/2018 7:00 AM 0.00 0.0 M M M
3/4/2018 7:00 AM 0.00 0.0 M M M
3/5/2018 7:00 AM 0.00 0.0 M M M
3/6/2018 7:00 AM 0.00 0.0 M M M
3/7/2018 7:00 AM 0.00 0.0 M M M
3/8/2018 7:00 AM 0.00 0.0 M M M
3/9/2018 7:00 AM 0.00 0.0 M M M
3/10/2018 7:00 AM 0.00 0.0 M M M
3/11/2018 7:00 AM 0.00 0.0 M M M
3/14/2018 7:00 AM 0.00 0.0 M M M
3/15/2018 7:00 AM 0.00 0.0 M M M
3/16/2018 7:00 AM 0.14 M M M M
3/17/2018 7:00 AM 0.00 0.0 M M M
3/18/2018 7:00 AM 0.00 0.0 M M M
3/19/2018 6:30 AM 0.71 0.3 M 0.3 M No snow accumulation on roads or sidewalks. Snow on ground frozen. Rain turned to heavy wet snow. Snow froze overnight.
3/20/2018 6:00 AM 0.00 0.0 M M M
3/21/2018 7:00 AM 0.00 0.0 M M M
3/22/2018 7:00 AM 0.00 0.0 M M M
3/23/2018 7:00 AM 0.00 0.0 M M M
3/24/2018 7:00 AM 0.00 0.0 M M M
3/25/2018 7:00 AM 0.00 0.0 M M M
3/26/2018 7:00 AM 0.07 M M M M
3/27/2018 7:30 AM 0.72 2.6 M M M
3/28/2018 7:00 AM 0.00 0.0 M M M Thin patches of snow on north facing slopes
3/29/2018 7:00 AM 0.46 0.1 M M M
3/30/2018 7:00 AM 0.08 T M M M
3/31/2018 7:00 AM 0.00 0.0 M M M
4/1/2018 7:00 AM 0.03 T M M M Sleeting at time of measurement
4/2/2018 7:00 AM 0.01 M M M M
4/3/2018 7:00 AM 0.00 0.0 M M M
4/4/2018 7:00 AM 0.00 0.0 M M M
4/5/2018 7:00 AM 0.00 0.0 M M M
4/6/2018 7:00 AM 0.00 0.0 M M M
4/8/2018 7:00 AM 0.00 0.0 M M M
4/9/2018 7:00 AM T M M M M Light rain starting at time of observation.
4/10/2018 7:00 AM 0.05 M M M M Drizzle and light snow from 7-8am yesterday
4/11/2018 7:00 AM 0.00 0.0 M M M
4/12/2018 7:00 AM 0.00 0.0 M M M
4/20/2018 7:00 AM 0.00 0.0 M M M
4/21/2018 7:15 AM 0.24 T M M M Light rain yesterday afternoon Light sleet late yesterday Light snow at time of measurement- snowing
4/22/2018 7:30 AM 0.08 M M M M Light snow / rain ended mid-morning.
4/23/2018 6:30 AM 0.00 0.0 M M M
4/24/2018 7:00 AM 0.20 T M T M Very light rain/snow mix at time of measurement
4/27/2018 7:00 AM 0.00 0.0 M M M
4/28/2018 7:00 AM 0.00 0.0 M M M
4/29/2018 7:00 AM 0.00 0.0 M M M
4/30/2018 7:00 AM 0.00 0.0 M M M
5/1/2018 7:00 AM 0.00 0.0 M M M
5/2/2018 7:00 AM T M M M M Very light rain during day. No rain in gauge.
5/3/2018 7:00 AM 0.99 M M M M Raining at time of measurement
5/4/2018 7:00 AM 0.56 M M M M
5/5/2018 7:00 AM 0.02 M M M M
5/6/2018 7:00 AM 0.00 0.0 M M M
5/7/2018 7:00 AM 0.00 0.0 M M M
5/8/2018 7:00 AM 0.00 0.0 M M M
5/9/2018 7:00 AM 0.00 0.0 M M M
5/10/2018 6:00 AM 0.00 0.0 M M M
5/11/2018 7:00 AM 0.00 0.0 M M M
5/12/2018 7:00 AM 0.16 M M M M
5/13/2018 7:00 AM 0.22 M M M M
5/14/2018 7:00 AM 0.57 M M M M
5/15/2018 7:00 AM 0.02 M M M M
5/16/2018 7:00 AM 0.00 0.0 M M M
5/17/2018 7:00 AM 0.00 0.0 M M M
5/18/2018 7:00 AM 0.00 0.0 M M M
5/19/2018 7:00 AM 1.94 M M M M Heavy rain mixed with pea-sized hail, Friday from approximately 3:30 to 5 Precipitation amount 1.92 inches
5/22/2018 7:00 AM 0.00 0.0 M M M 0.33 inches of rain Saturday to Monday, I was not available to make measurements those two mornings
5/23/2018 7:00 AM 0.13 M M M M
5/24/2018 7:00 AM 0.12 M M M M
5/25/2018 7:00 AM 0.01 M M M M
5/26/2018 7:00 AM 0.00 0.0 M M M
5/27/2018 7:00 AM 0.00 0.0 M M M
5/28/2018 7:00 AM 0.00 0.0 M M M
5/29/2018 7:00 AM 0.05 M M M M
5/30/2018 7:00 AM 0.00 0.0 M M M
5/31/2018 7:00 AM 0.16 M M M M
6/1/2018 7:00 AM 0.02 M M M M
6/2/2018 9:00 AM 0.00 0.0 M M M
6/4/2018 7:00 AM 0.00 0.0 M M M
6/5/2018 7:00 AM 0.00 0.0 M M M
6/6/2018 7:00 AM 0.00 0.0 M M M
6/7/2018 7:00 AM 0.00 0.0 M M M
6/8/2018 7:00 AM 0.00 0.0 M M M
6/9/2018 7:00 AM 0.00 0.0 M M M
6/10/2018 7:00 AM 0.00 0.0 M M M
6/11/2018 7:00 AM 0.00 0.0 M M M
7/7/2018 7:00 AM 0.00 0.0 M M M
7/8/2018 7:00 AM 0.00 0.0 M M M
7/9/2018 7:00 AM 0.00 0.0 M M M
7/10/2018 7:00 AM 0.00 0.0 M M M
7/11/2018 7:00 AM 0.00 0.0 M M M
7/14/2018 7:00 AM 0.00 0.0 M M M
7/15/2018 7:00 AM 0.00 0.0 M M M
7/16/2018 7:00 AM 0.37 M M M M
7/17/2018 7:00 AM 0.01 M M M M
7/18/2018 7:00 AM 0.01 M M M M
7/25/2018 7:00 AM T M M M M
7/26/2018 7:00 AM 0.45 M M M M
7/28/2018 7:00 AM 0.03 M M M M
7/29/2018 9:00 AM 0.02 M M M M
7/30/2018 7:00 AM 0.03 M M M M
7/31/2018 7:00 AM 0.00 0.0 M M M
8/1/2018 7:00 AM 0.00 0.0 M M M
8/2/2018 7:00 AM 0.00 0.0 M M M
8/22/2018 7:00 AM 0.02 M M M M
8/23/2018 7:00 AM 0.00 0.0 M M M
8/24/2018 7:00 AM 0.00 0.0 M M M
8/25/2018 7:00 AM 0.00 0.0 M M M
8/26/2018 7:00 AM 0.00 0.0 M M M
8/27/2018 7:00 AM 0.00 0.0 M M M
8/28/2018 7:00 AM 0.00 0.0 M M M
8/29/2018 7:00 AM 0.00 0.0 M M M
8/30/2018 7:00 AM 0.00 0.0 M M M
8/31/2018 7:00 AM 0.00 0.0 M M M
9/1/2018 7:00 AM 0.00 0.0 M M M
9/2/2018 7:00 AM 0.00 0.0 M M M
9/3/2018 7:00 AM 0.00 0.0 M M M
9/4/2018 7:00 AM 0.00 0.0 M M M
9/5/2018 7:00 AM 0.68 M M M M
9/6/2018 7:00 AM 0.05 M M M M
9/7/2018 7:00 AM 0.15 M M M M
9/8/2018 7:00 AM 0.01 M M M M Rain measured may be dripping dew
9/9/2018 7:00 AM 0.00 0.0 M M M
9/10/2018 7:00 AM 0.00 0.0 M M M
9/11/2018 7:00 AM 0.00 0.0 M M M
9/12/2018 7:00 AM 0.00 0.0 M M M
9/19/2018 7:00 AM 0.00 0.0 M M M
9/20/2018 7:00 AM 0.05 M M M M
9/21/2018 7:00 AM 0.00 0.0 M M M
9/22/2018 7:00 AM 0.00 0.0 M M M
9/23/2018 7:00 AM 0.00 0.0 M M M
9/25/2018 7:00 AM 0.00 0.0 M M M
9/26/2018 7:00 AM 0.00 0.0 M M M
9/28/2018 7:00 AM 0.00 0.0 M M M
9/30/2018 7:00 AM 0.00 0.0 M M M



Start Date End Date & Time Duration in Days Precipitation Snow Depth Snow Depth SWE Notes
7/12/2018 7/13/2018 7:00 AM 2 0.03 M M
7/19/2018 7/24/2018 7:00 AM 6 0.82 M M
8/3/2018 8/21/2018 7:00 AM 19 0.57 M M
9/13/2018 9/18/2018 7:00 AM 6 0.00 M M



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