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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 has been moved to the Pocomoke area.

Self-Reporting Gauge Platforms

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 KML File

Current Report Date: 07/06/2022

Gauge Location File: Gauge_LUTs/gauge_lookup_WFF_20210910.txt

Report generated 07/06/2022 @ 05:00:06 Local (07/06/2022 @ 09:00:06 UTC)

Site	Name	PackNum	Wetness	Voltage	Solar	RSSI	Tips A/B	Accums [mm]	Accums [in]	Bias [%]
NASA0001	Lowes	28/96	3.3/3.3	12.7/12.8	0.6/9.4	-87.6/-87.5	0/0	0.00/0.00	0.00/0.00	0.00
NASA0002	Poultry_Supply	21/96	3.3/3.3	12.7/12.8	0.8/12.8	-87.6/-87.4	0/0	0.00/0.00	0.00/0.00	0.00
NASA0003	Triangle	10/96	3.3/3.3	12.7/12.8	0.7/9.1	-87.6/-87.3	0/0	0.00/0.00	0.00/0.00	0.00
NASA0004	Pocomoke_MS	8/96	3.3/3.3	12.8/12.9	1.0/12.7	-87.4/-87.1	0/0	0.00/0.00	0.00/0.00	0.00
NASA0009	Haywards_Lott	25/96	3.3/3.3	12.6/12.6	0.5/8.5	-87.8/-87.7	0/0	0.00/0.00	0.00/0.00	0.00
NASA0012	William_St_Well	11/96	3.3/3.3	12.8/12.9	0.7/9.6	-87.4/-87.3	0/0	0.00/0.00	0.00/0.00	0.00
NASA0013	Pocomoke_HS	1/96	3.3/3.3	12.7/12.8	0.7/9.4	-87.6/-87.4	0/0	0.00/0.00	0.00/0.00	0.00
NASA0016	Crip_Taylor	26/96	3.3/3.3	12.7/12.8	0.7/10.4	-87.6/-87.4	0/0	0.00/0.00	0.00/0.00	0.00
NASA0017	WFF_Pad	26/96	3.3/3.3	12.7/12.8	0.8/12.0	-87.6/-87.4	0/0	0.00/0.00	0.00/0.00	0.00
NASA0019	Lankford_Farm	14/96	3.3/3.3	12.7/12.8	0.7/11.9	-87.6/-87.4	0/0	0.00/0.00	0.00/0.00	0.00
NASA0020	Somerset_Rd	31/96	3.3/3.3	12.7/12.9	0.8/12.5	-87.6/-87.3	0/0	0.00/0.00	0.00/0.00	0.00
NASA0021	East	3/96	3.3/3.3	12.7/12.8	0.8/12.9	-87.6/-87.3	0/0	0.00/0.00	0.00/0.00	0.00
NASA0022	Plywood	29/96	3.3/3.3	12.8/12.9	0.9/13.2	-87.4/-87.2	0/0	0.00/0.00	0.00/0.00	0.00
NASA0023	Kelder_Farm	11/96	3.3/3.3	12.7/12.8	0.8/12.0	-87.6/-87.4	0/0	0.00/0.00	0.00/0.00	0.00
NASA0025	Stockton	31/96	3.3/3.3	12.8/12.9	0.6/8.9	-87.4/-87.3	58/57	14.73/14.48	0.58/0.57	1.72
NASA0027	Stille	18/96	5.0/5.0	12.8/12.9	0.6/10.6	-87.4/-87.3	62/61	15.75/15.49	0.62/0.61	1.61
NASA0029	Miller	21/96	5.0/5.0	12.8/12.9	0.7/11.7	-87.4/-87.2	159/138	40.39/35.05	1.59/1.38	13.21
NASA0031	American_Legion	18/96	5.0/5.0	12.7/12.7	0.5/8.9	-87.6/-87.5	0/0	0.00/0.00	0.00/0.00	0.00
NASA0032	Koehler	2/96	5.0/5.0	12.9/13.0	0.5/5.9	-87.2/-87.0	32/31	8.13/7.87	0.32/0.31	3.12
NASA0038	Snow_Hill_Auto	3/96	5.0/5.0	12.7/12.8	0.5/7.4	-87.6/-87.4	103/104	26.16/26.42	1.03/1.04	-0.97
NASA0039	Doc_Johnson	34/96	5.0/5.0	12.6/12.7	0.7/11.1	-87.8/-87.5	0/0	0.00/0.00	0.00/0.00	0.00
NASA0041	LeVecque	16/96	5.0/5.0	12.7/12.8	0.8/13.2	-87.6/-87.4	0/0	0.00/0.00	0.00/0.00	0.00
NASA0044	Sysco	31/96	5.0/5.0	12.7/12.8	19.0/19.8	-87.6/-87.3	0/3	nan/0.76	nan/0.03	0.00
NASA0045	Silva_Rd	30/96	5.0/5.0	12.8/12.9	0.6/10.0	-87.4/-87.2	0/0	0.00/0.00	0.00/0.00	0.00
NASA0101	Gerlach	32/96	5.0/5.0	12.7/12.7	0.9/12.1	-87.6/-87.5	0/0	0.00/0.00	0.00/0.00	0.00

Current UTC Date: Wed, 06 Jul 2022 09:14:19 +0000

Daily Summaries

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.

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).