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Rain Gauge: GPM Precipitation Science Research Facility

Wallops PRF High-Density Gauge Network

A network of 25 indvidual gauge platforms (two gauge per platform) that were deployed in a 5 km x 5 km area near Nassawadox, VA area from April 2012 to July 2013. Now that the NPOL radar has been deployed in the Newark, MD area, the network will be moved the Pocomoke area.

Self-Reporting Gauge Platforms

Click image above to zoom

Click image above to zoom

The Wallops GPM PRF is currently supporting two gauge and disdrometer networks. A high density gauge grid is located in an around Pocomoke City, MD is aimed towards validating space-based estimates on the scale of the nominal GPM DPR footprint size of about 5 km. The second, larger grid, also includes the Pocomoke network, but it's scale is approximately 0.5 degrees (lat & lon). This network will serve to better validate both DPR and GMI observations and is well sampled by NASA's NPOL radar, which is located in Newark, MD. The 0.5 degree scale is roughly bounded by Chincoteague, VA to the southeast; Crisfield, MD to the southwest; Salisbury, MD to the north; and, Newark, MD to the northeast.

Latest KMZ File


Gauge Network Daily Report: 12/15/2018

Report generated Sat Dec 15 19:00:03 EST 2018
Site Location Packets Last Packet Wetness (Min/Mean) Voltage (Min/Mean) Solar (Mean/Max) RSSI (Min/Mean) Tips (A/B) Accum (A/B) [mm] Accum (A/B) [inches] Bias [%]
NASA0001 Lowes 95/96 23:46:34 3.3/3.30 12.0/12.04 4.49/12.7 -87.0/-81.06 77/74 19.56/18.80 0.77/0.74 3.89
NASA0002 Sigrist 96/96 23:46:33 3.3/3.30 12.2/12.22 4.47/12.9 -93.0/-89.31 74/76 18.80/19.30 0.74/0.76 -2.66
NASA0003 Triangle 96/96 23:46:32 3.3/3.30 12.4/12.47 4.53/13.2 -61.0/-56.79 79/81 20.07/20.57 0.79/0.81 -2.49
NASA0004 Pocomoke_MS 96/96 23:46:25 3.3/3.30 12.5/12.53 4.61/13.2 -81.0/-77.08 75/78 19.05/19.81 0.75/0.78 -3.99
NASA0006 TNC_Boomer_1 /96 / / / /
NASA0007 Gerlach 96/96 23:46:33 3.3/3.30 12.3/12.33 4.44/13.0 -93.0/-77.65 80/82 20.32/20.83 0.80/0.82 -2.51
NASA0008 William_St_Well 96/96 23:46:26 3.3/3.30 12.5/12.54 4.55/13.3 -93.0/-88.42 76/73 19.30/18.54 0.76/0.73 3.94
NASA0009 Haywards_Lott 96/96 23:46:32 3.3/3.30 12.4/12.50 4.49/13.0 -91.0/-83.21 75/74 19.05/18.80 0.75/0.74 1.31
NASA0010 Lankford_Farm 96/96 23:46:33 3.3/3.30 11.7/11.80 4.29/12.2 -75.0/-87.62 77/76 19.56/19.30 0.77/0.76 1.33
NASA0011 YMCA 96/96 23:46:37 3.3/3.30 12.6/12.69 4.62/13.5 -73.0/-71.44 78/77 19.81/19.56 0.78/0.77 1.26
NASA0012 MD_DOA 96/96 23:46:32 3.3/3.30 12.3/12.34 4.44/12.9 -71.0/-71.10 93/86 23.62/21.84 0.93/0.86 7.54
NASA0013 Pocomoke_HS 96/96 23:45:22 3.3/3.30 12.6/12.72 4.59/13.5 -87.0/-65.79 81/100 20.57/25.40 0.81/1.00 -23.48
NASA0015 Sysco 96/96 23:46:24 3.3/3.30 12.6/12.69 16.12/19.2 -91.0/-82.69 79/77 20.07/19.56 0.79/0.77 2.54
NASA0016 Crip_Taylor 96/96 23:46:35 3.3/3.30 10.3/11.09 4.22/12.4 /-82.35 76/76 19.30/19.30 0.76/0.76 0.00
NASA0017 Silva_Rd /96 / / / /
NASA0018 Plywood 96/96 23:46:28 3.3/3.30 12.7/12.75 4.61/13.4 -105.0/-88.15 72/90 18.29/22.86 0.72/0.90 -24.99
NASA0019 Jester 95/96 23:46:28 3.3/3.30 12.3/12.47 4.50/13.2 -83.0/-97.23 95/96 24.13/24.38 0.95/0.96 -1.04
NASA0020 Somerset_Rd 96/96 23:46:26 3.3/3.30 12.2/12.20 3.48/10.2 -87.0/-78.04 76/76 19.30/19.30 0.76/0.76 0.00
NASA0021 James_East 96/96 23:46:32 3.3/3.30 12.6/12.66 4.65/13.4 -77.0/-83.42 73/72 18.54/18.29 0.73/0.72 1.35
NASA0022 Powellville_FD 96/96 23:46:33 3.3/3.30 12.6/12.67 4.62/13.2 -93.0/-74.77 96/93 24.38/23.62 0.96/0.93 3.12
NASA0023 Kelder_Farm 96/96 23:46:40 3.3/3.30 12.6/12.66 4.57/13.4 -81.0/-85.10 19/75 4.83/19.05 0.19/0.75 -294.41
NASA0024 Doc_Johnson 96/96 23:46:35 3.3/3.30 12.2/12.37 4.50/13.2 -77.0/-68.29 72/72 18.29/18.29 0.72/0.72 0.00
NASA0025 Stockton 96/96 23:46:35 3.3/3.30 12.4/12.44 4.49/13.2 -107.0/-72.85 125/123 31.75/31.24 1.25/1.23 1.61
NASA0027 Stille 94/96 23:46:28 5.0/5.00 12.0/12.12 4.47/12.7 -91.0/-97.68 98/95 24.89/24.13 0.98/0.95 3.05
NASA0029 WFF_Pad29 96/96 23:46:32 5.0/5.00 7.6/10.39 3.84/13.1 -53.0/-81.08 195/163 49.53/41.40 1.95/1.63 16.41
NASA0031 American_Legion 96/96 23:46:27 5.0/5.00 12.0/12.10 4.43/12.7 -95.0/-52.23 79/74 20.07/18.80 0.79/0.74 6.33
NASA0032 Koehler 96/96 23:46:23 5.0/5.00 12.7/12.71 4.55/13.3 -71.0/-91.98 83/82 21.08/20.83 0.83/0.82 1.19
NASA0033 H&H 96/96 23:46:33 5.0/5.00 12.4/12.51 4.51/13.4 /-55.44 186/160 47.24/40.64 1.86/1.60 13.97
NASA0034 Richardson /96 / / / /
NASA0035 McIntyre 92/96 23:46:34 5.0/5.00 12.4/12.50 4.41/13.0 -101.41/-101.41 80/79 20.32/20.07 0.80/0.79 1.23
NASA0038 Snow_Hill_Auto 96/96 23:45:31 5.0/5.00 12.0/12.30 3.90/12.0 -101.0/-52.50 80/101 20.32/25.65 0.80/1.01 -26.23
NASA0039 Thornton 93/96 23:46:30 5.0/5.00 11.9/12.02 4.37/12.7 -75.0/-98.66 75/71 19.05/18.03 0.75/0.71 5.35
NASA0040 Carmean 96/96 23:46:30 5.0/5.00 12.2/12.21 4.51/12.6 -93.0/-74.38 99/100 25.15/25.40 0.99/1.00 -0.99
NASA0041 LeVecque 96/96 23:46:39 5.0/5.00 12.2/12.33 4.50/13.0 /-86.98 107/102 27.18/25.91 1.07/1.02 4.67
NASA0042 Miller /96 / / / /
NASA0043 Wilkerson 96/96 23:46:37 5.0/5.00 11.4/11.74 4.42/12.9 -101.46/-101.46 73/75 18.54/19.05 0.73/0.75 -2.75
NASA0044 Sod_Farm 96/96 23:46:34 5.0/5.00 12.4/12.44 18.81/21.6 -67.0/-58.58 85/91 21.59/23.11 0.85/0.91 -7.04
NASA0045 MD_DNR 1/96 18:01:39 5.0/5.00 9.4/9.40 9.70/9.7 /-67.00 20/20 5.08/5.08 0.20/0.20 0.00
NASA0090 WFF_Pad90 /96 / / / /
NASA0101 TNC_Boomer_2 96/96 23:46:50 5.0/5.00 12.3/12.38 4.57/13.0 -93.0/-90.10 94/97 23.88/24.64 0.94/0.97 -3.18

Click on site name to see a daily rain rate time series.

Current UTC Date: Sun, 16 Dec 2018 00:04:59 +0000

Daily Summaries

Daily Summary Report
Daily Tip Summary Plot
Daily Network Contour Plots

All times are in Universal Time Coordinate (UTC) and each report represents the 24 period between 0000-2359 UTC. See the line just above for the current UTC time.

But, generally, for the Eastern Shore, during fall and winter this means the period is between 8 PM the previous night and 8 PM for the current night. During the sprint and summer, the period is between 7 PM the previous night and 7 PM for the current night.

Parameter Description
Packets These gauges report every 15 minutes (4 times per hour), so the maximum number of packets received in each 24 hour period is 24*4=96.
Wetness This parameter indicates the humidity inside the "black box" which houses the electronics. Any number greater than 3.3 could indicate moisture in the box and the gauge should be visited.
Voltage The voltage parameter indicates the voltage of the battery housed inside the container. Red values indicate that the voltage is low and may trigger a maintenance visit.
Solar The solar parameter provides the current period statistics on solar power being processed by the solar panel.
RSSI The RSSI parameter represents the cellular modem signal strength.
Tips (A/B) There are two gauges on each platform. When facing the front the gauge (the side with the lock on it), gauge A is on the left and gauge B is on the right. Each tip represents 0.254 mm or 0.01" or rain.
Accum (A/B) [mm] This parameter is the accumulated parameter in the current 24-hour period, expressed in mm. Note that 1 inch = 25.4 mm.
Accum (A/B) [inches] This parameter is the accumulated parameter in the current 24-hour period, expressed in inches.
Bias [%] This parameter represents the bias in accumulated rainfall between the two gauges. It is expressed as a percentage. Biases of more than about 10% indicate a problem with one or more of the gauges.

Bias = [ (#Tips Gauge A - #Tips Gauge B) / #Tips Gauge A ]


Known Issues

WARNING: Due to server/security issues, there is no reliable gauge data from 11/17/2017 - 01/26/2018

Follow the link below to determine periods where blockage was possible/probable or days when maintenance of the platforms might have caused spurious tips, even though no rain occurred.

[2012] [2013] [2014] [2015] [2016] [2017] [2018]

Summary Plots

You can view the latest summary plots for the 25 gauges in 5x5 panels by clicking the links below. The tips plot uses the raw tip data to calculate the total accumulation for each day. The rain rate plot converts the raw tip data to 1-min average rain rates using a cubic spline technique by Wang and Wolff (2008).

Monthly Summaries

Daily Gauge Totals

Gauge Quick Look Products

Daily/Monthly Accumulation Plots (DMAPlots)
Geographical Monthly Accumulation Plots (GMAPlot)
PDF/CDF Plots (PDFPlots)
Daily Rainfall Time Series Plots (DAILYPlot)
Cumulative One-Minute Rainfall Time Series Plots (MINUTEPlot)

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