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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: 06/28/2017

Report generated Wed Jun 28 14:43:37 EDT 2017
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 75/96 18:31:33 3.3/3.30 12.6/12.87 5.92/14.4 -87.0/-81.35 41/43 10.41/10.92 0.41/0.43 -4.90
NASA0002 Mike_Sigrist 74/96 18:31:22 3.3/3.30 12.7/13.06 3.70/14.4 -91.0/-88.05 47/47 11.94/11.94 0.47/0.47 0.00
NASA0003 Triangle 75/96 18:31:34 3.3/3.30 12.8/13.15 5.06/14.7 -77.0/-65.56 45/45 11.43/11.43 0.45/0.45 0.00
NASA0004 Pocomoke_MS 75/96 18:31:17 3.3/3.30 12.8/13.20 3.74/14.7 -89.0/-80.68 32/32 8.13/8.13 0.32/0.32 0.00
NASA0005 Landfill 74/96 18:31:32 3.3/3.30 12.8/13.19 5.07/14.4 -93.0/-86.03 24/24 6.10/6.10 0.24/0.24 0.00
NASA0007 Gerlach 75/96 18:31:27 3.3/3.30 12.7/13.14 5.54/14.6 -89.0/-80.17 44/45 11.18/11.43 0.44/0.45 -2.24
NASA0008 William_St_Well 74/96 18:31:30 3.3/3.30 12.7/13.14 4.49/14.3 -85.0/-81.41 30/31 7.62/7.87 0.30/0.31 -3.28
NASA0009 Haywards_Lott 74/96 18:31:35 3.3/3.30 12.7/13.08 5.35/14.6 -95.0/-91.59 42/43 10.67/10.92 0.42/0.43 -2.34
NASA0010 Lankford_Farm 74/96 18:31:26 3.3/3.30 12.1/12.26 6.18/12.9 -103.0/-96.41 52/48 13.21/12.19 0.52/0.48 7.72
NASA0011 YMCA 75/96 18:31:20 3.3/3.30 12.8/13.18 4.84/14.3 -79.0/-71.83 44/44 11.18/11.18 0.44/0.44 0.00
NASA0012 MD_DOA 75/96 18:31:25 3.3/3.30 12.7/13.10 4.41/14.5 -79.0/-73.08 11/12 2.79/3.05 0.11/0.12 -9.32
NASA0013 Pocomoke_HS 75/96 18:31:25 3.3/3.30 12.7/12.95 4.79/14.4 -81.0/-67.19 19/19 4.83/4.83 0.19/0.19 0.00
NASA0015 Sysco 75/96 18:31:25 3.3/3.30 12.8/13.18 12.09/12.6 -105.0/-96.60 39/40 9.91/10.16 0.39/0.40 -2.52
NASA0016 Crip_Taylor 75/96 18:31:30 3.3/3.30 12.7/13.15 3.35/14.4 -89.0/-80.65 49/48 12.45/12.19 0.49/0.48 2.09
NASA0017 Silva_Rd 75/96 18:31:32 3.3/3.30 12.3/12.35 6.35/12.7 -107.0/-93.77 1/1 0.25/0.25 0.01/0.01 n/a
NASA0018 Plywood 75/96 18:31:31 3.3/3.30 12.7/13.11 5.48/14.5 -103.0/-95.48 39/40 9.91/10.16 0.39/0.40 -2.52
NASA0019 Jester 68/96 18:31:35 3.3/3.30 12.7/13.08 4.80/14.5 -100.24/-100.24 6/6 1.52/1.52 0.06/0.06 0.00
NASA0020 Somerset_Rd 75/96 18:31:30 3.3/3.30 12.7/13.10 4.00/14.4 -93.0/-84.60 52/50 13.21/12.70 0.52/0.50 3.86
NASA0021 James_East 72/96 18:31:36 3.3/3.30 12.7/13.10 4.35/14.1 -95.0/-86.50 47/46 11.94/11.68 0.47/0.46 2.18
NASA0022 Powellville_FD 75/96 18:31:36 3.3/3.30 12.7/13.13 5.95/14.4 -83.0/-75.13 4/4 1.02/1.02 0.04/0.04 0.00
NASA0023 Kelder_Farm 74/96 18:31:26 3.3/3.30 12.8/13.18 5.04/14.6 -97.0/-92.41 27/27 6.86/6.86 0.27/0.27 0.00
NASA0024 Doc_Johnson 75/96 18:31:28 3.3/3.30 12.7/13.20 5.24/14.6 -97.0/-85.99 15/15 3.81/3.81 0.15/0.15 0.00
NASA0025 Stockton 74/96 18:31:35 3.3/3.30 12.5/12.67 6.55/13.6 -105.0/-84.95 5/5 1.27/1.27 0.05/0.05 0.00
NASA0027 Stille 74/96 18:31:27 5.0/5.00 12.7/12.99 5.19/14.2 -105.0/-93.68 20/28 5.08/7.11 0.20/0.28 -39.96
NASA0029 Pusey 75/96 18:31:29 5.0/5.00 12.8/13.22 6.03/14.4 -87.0/-80.76 4/4 1.02/1.02 0.04/0.04 0.00
NASA0031 American_Legion 72/96 18:31:03 5.0/5.00 12.7/13.02 6.27/14.5 -65.0/-50.47 24/22 6.10/5.59 0.24/0.22 8.36
NASA0032 Koehler 74/96 18:31:28 5.0/5.00 12.8/13.21 4.34/14.7 -103.0/-93.51 2/2 0.51/0.51 0.02/0.02 n/a
NASA0033 Watson 75/96 18:31:39 5.0/5.00 12.7/13.09 5.43/14.5 -65.0/-54.39 2/2 0.51/0.51 0.02/0.02 n/a
NASA0034 Richardson 75/96 18:31:18 5.0/5.00 12.7/13.03 5.26/14.4 -77.0/-72.20 / / /
NASA0035 WFF_Pad35 75/96 18:31:23 5.0/5.00 12.7/13.17 5.28/14.5 -91.0/-84.39 4/4 1.02/1.02 0.04/0.04 0.00
NASA0037 Bernard 0/96 n/a -999.00/-999.0 / / /
NASA0038 Snow_Hill_Auto 75/96 18:31:37 5.0/5.00 12.7/12.92 4.43/14.0 -71.0/-61.88 7/8 1.78/2.03 0.07/0.08 -14.04
NASA0040 Carmean 75/96 18:31:35 5.0/5.00 12.6/13.00 5.39/14.4 -85.0/-77.96 7/7 1.78/1.78 0.07/0.07 0.00
NASA0041 LeVecque 74/96 18:31:23 5.0/5.00 12.7/13.00 5.35/14.1 -93.0/-89.32 43/40 10.92/10.16 0.43/0.40 6.96
NASA0043 Wilkerson 75/96 18:30:56 5.0/5.00 12.7/13.04 5.14/14.4 -100.39/-100.39 7/7 1.78/1.78 0.07/0.07 0.00
NASA0044 Sod_Farm 74/96 18:31:30 5.0/5.00 12.7/13.16 15.05/21.5 -71.0/-64.38 1/1 0.25/0.25 0.01/0.01 n/a
NASA0045 MD_DNR 75/96 18:31:32 5.0/5.00 12.8/13.13 6.51/14.7 -77.0/-68.15 2/2 0.51/0.51 0.02/0.02 n/a
NASA0006 TNC_Boomer_1 75/96 18:31:30 3.3/3.30 12.8/13.16 5.19/14.4 -93.0/-88.92 / / /
NASA0101 TNC_Boomer_2 75/96 18:31:59 5.0/5.00 12.5/12.77 3.02/14.1 -103.0/-92.01 1/1 0.25/0.25 0.01/0.01 n/a

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

Current UTC Date: Wed, 28 Jun 2017 19:01:10 +0000

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 cumulated 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 cumulated 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

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.

Known Issues | [2012] | [2013] | [2014] [2015] [2016] |

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).

Daily Summaries

Daily Summary Report
Daily Tip Summary Plot
Daily Network Contour Plots

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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