NMQ: National Mosaic and Multi-Sensor QPE
Comparisons of rainrates from gauges and NMQ
Gauge data
A network of 25 indvidual gauge platforms (two tipping-bucket gauges per platform) was deployed
near Nassawadox, VA area from Apr 2012 to Sep 2013. Now that the
NPOL radar
has been deployed in the Newark, MD area, the gauge network has been moved to the Pocomoke area.
Here are two lists of these gauges and their locations as well as their start & end days over Nassawadox
and Pocomoke, respectively. "9999-99-99" denotes the gauge platform is still in the network.
Nassawadox, VA
Site Lon(W) Lat(N) FirstDay LastDay
NASA0001 75.855483 37.464294 2012-06-20 2013-08-20
NASA0002 75.870914 37.479934 2012-05-29 2013-08-02
NASA0003 75.818810 37.480184 2012-06-04 2013-11-01
NASA0004 75.833199 37.485523 2012-04-12 2013-09-19
NASA0005 75.873794 37.494881 2012-05-29 2013-08-02
NASA0006 75.830337 37.457823 2012-04-12 2013-11-05
NASA0007 75.869381 37.462185 2012-04-18 2013-08-01
NASA0008 75.860087 37.458290 2012-06-04 2013-08-20
NASA0009 75.840281 37.477076 2012-05-31 2013-09-18
NASA0010 75.834104 37.489726 2012-04-12 2013-09-18
NASA0011 75.832614 37.454834 2012-04-12 2013-11-05
NASA0012 75.825978 37.472034 2012-04-12 2013-11-04
NASA0013 75.845139 37.476591 2012-04-13 2013-09-16
NASA0014 75.835465 37.468525 2012-04-12 2013-08-20
NASA0015 75.876652 37.458770 2012-04-18 2013-08-01
NASA0016 75.843985 37.486936 2012-04-12 2013-09-20
NASA0017 75.863694 37.476632 2012-04-18 2013-09-19
NASA0018 75.878907 37.472453 2012-05-31 2013-08-02
NASA0019 75.864073 37.478764 2012-04-12 2013-08-01
NASA0020 75.825278 37.489978 2012-04-12 2013-09-20
NASA0021 75.846088 37.466847 2012-04-13 2013-09-16
NASA0022 75.857078 37.492575 2012-04-18 2013-08-02
NASA0023 75.852746 37.487039 2012-05-29 2013-08-01
NASA0024 75.853688 37.453094 2012-06-25 2013-08-20
NASA0025 75.825369 37.464917 2012-04-12 2013-11-04
Pocomoke, MD
Site Lon(W) Lat(N) FirstDay LastDay
NASA0001 75.55817 38.07776 2013-10-18 9999-99-99 Lowes
NASA0002 75.58570 38.08469 2013-08-29 9999-99-99 Mike Sigrist Farm
NASA0003 75.54588 38.07542 2013-12-04 9999-99-99 Harry Williams Site
NASA0004 75.56688 38.06717 2013-10-22 9999-99-99 Pocomoke Middle School
NASA0005 75.56766 38.09393 2013-09-05 2014-06-25 Paul Bashor's house
NASA0005 75.47098 37.93460 2014-07-18 2015-02-05 Pad
NASA0005 75.73399 38.12071 2015-02-05 9999-99-99 SomerseT County Landfill
NASA0006 75.58559 38.06242 2013-12-13 9999-99-99 Glenn Holland
NASA0007 75.55283 38.09977 2013-08-30 9999-99-99 John Gerlach House
NASA0008 75.57955 38.06687 2013-09-03 9999-99-99 Williams Street Well
NASA0009 75.58957 38.09264 2013-09-23 9999-99-99 Hayward's Lott
NASA0010 75.59969 38.08731 2013-10-28 9999-99-99 Josh Lankford Farm
NASA0011 75.54 38.08223 2014-02-04 9999-99-99 Pocomoke City YMCA
NASA0012 75.47098 37.98456 2013-11-01 2014-06-04 Pad159
NASA0012 75.65482 38.36982 2014-06-04 9999-99-99 Dept of Agri.
NASA0013 75.55296 38.06023 2013-10-22 9999-99-99 Pocomoke High School
NASA0014 75.54846 38.06604 2013-09-13 9999-99-99 American Legion
NASA0015 75.59929 38.08171 2013-09-03 9999-99-99 Sysco
NASA0016 75.57449 38.08543 2013-09-26 9999-99-99 Crip Taylor
NASA0017 75.57011 38.07595 2013-10-28 9999-99-99 Pocomoke City Visitor Center Roof
NASA0018 75.58720 38.07211 2013-08-28 9999-99-99 Chip Mill
NASA0019 75.58957 38.08171 2013-09-05 2014-07-14 Atlantic Tractor
NASA0019 75.52278 38.01403 2014-07-21 9999-99-99 Jester site
NASA0020 75.56734 38.08926 2013-09-26 9999-99-99 Somerset road
NASA0021 75.5950 38.09748 2013-09-30 9999-99-99 James East Farm
NASA0022 75.56447 38.05583 2013-09-10 2014-06-03 Fish Plant
NASA0022 75.40291 38.33173 2014-10-16 9999-99-99 Menning Farm
NASA0023 75.57008 38.0640 2013-10-18 2014-02-25 Pocomoke Fairgrounds Island
NASA0023 75.59583 38.05734 2014-03-01 9999-99-99 Herb Kelder Farm
NASA0024 75.57075 38.05513 2013-08-29 9999-99-99 Doc Johnson
NASA0025 75.47101 37.93456 2013-11-04 2013-08-21 N159 Pad
NASA0025 75.34166 38.26268 2014-08-21 9999-99-99 NPOL/D3R after 21 Aug 2014
Comparisons with NMQ at various scales
The following figures show the areal maps of Nassawadox and Pocomoke gauge networks along with 0.01o
NMQ grids. The dots denote locations of the individual gauge platforms with their identification
numbers indicated on the right.
All these gauges measure rainfall in increments of 0.01 inch (0.254 mm).
The gauge tip data are averaged over the entire network,
and compared with the average NMQ rainrates over the same area at hourly, 3-hourly and daily resolutions.
Note:
Gauge data from 21 Sep 2015 to 27 Oct 2015 are missing for most
gauges due to server hack.
Following NMQ data are also missing:
8-15 Sep 2015; 9-10, 23-31 Oct, 2015; 22-23 Nov 2015.
- Cumulative rainfall
- Scatter plot
- Mean difference and relative error
- PDF by occurrence and volume
In the PDF plot, rainrate thresholds are set to 0.1, 0.2 and 0.5 mm/h, which are close to ground radar,
GPM DPR and TRMM PR minimum detectable rainrates.
The inserted "Agreement" in the PDF plot is defined as the fraction of both NMQ and gauge report
the same rain category: rain ( rainrate >threshold), no rain (rainrate <=threshold) among all available
observations.
Agreement=N[(r>T & g>T) + (r<=T & g<=T)] / N(r>=T & g>=T)
where T is rain threshold (0.1,0.2 0r 0.5 mm/h),
N is sample size, r is NMQ rainrate, and g is gauge rainrate.
Be definition, Agreement is between 0 (worst) and 1 (best).
- Daily Rainfall Contour
Also shown below each contour plot are the area-averaged daily rain accumulation and pattern correlation
between NMQ and Gauge Bucket A/B.
Following scatter and PDF plots for combined NSWD & PCMK are after more rigid QCs:
All dates and hours are removed using 4 filters (hhr, day, mean & snow) from Jackson Tan
(Snowdays and their next days are all removed). More rigid QC does not
result in much difference.
- Scatter plot
- PDF by occurrence and volume
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