Intercomparison of CHARM Data and WSR-88D Storm Integrated Rainfall Gary Jedlovec (NASA), Paul Meyer (NASA), Anthony Guillory (NASA), Ashutosh Limaye (USRA), Global Hydrology and Climate Center,Huntsville, Alabama and Keith Stellman (NOAA/NWS), LMRFC, Slidell, Louisiana.
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Intercomparison of CHARM Data
and WSR-88D Storm Integrated Rainfall
Gary Jedlovec (NASA), Paul Meyer (NASA), Anthony Guillory (NASA), Ashutosh Limaye (USRA), Global Hydrology and Climate Center,Huntsville, Alabama and Keith Stellman (NOAA/NWS), LMRFC, Slidell, Louisiana
COOPERATIVE HUNTSVILLE-AREA RAINFALL MEASUREMENT NETWORK (CHARM)
GAUGE OWNERSHIP MAP
TYPES OF RAIN GAUGES USED IN CHARM
6”, 8” non-
6”, 8” tipping bucket – recorded electronically
6”, 8” recording
CHARM Data Analysis
Rainfall totals reported at 1200UTC for the preceding 24h . For June 4-5, the 24h totals capture only this storm event.
Irregularly spaced gauge data (from 200m to 10 km) were objectively analyzed to a uniform grid to create the image. Some smoothing of maximum values is inevitable.
Maximum rain rate of about 2 in/hr
Hourly Digital Precipitation Product
NWS HDP Products
Example of stage III radar product for
June 4, 2001 over Northern Alabama.
Hourly stage III product summed from 2100 – 0300 UTC.
Note the dual rainfall maximum in the stage III radar product corresponds nicely both in position and magnitude to the CHARM data.
Stellman et al. 2001 (Wea. Fore.)
Stage III versus CHARM
MD = 0.19”
SD = 0.50”
Comparison shows little or no bias (0.19”) between CHARM measurements and radar estimates. Scatter is considerable especially for amounts > 1.00”.
<1” > 1”
MD = 0.21” 0.17”
SD = 0.15” 0.60”
Combined Stage III and CHARM Data
Can time-continuous stage III data products be used to improve on 24h precipitation estimates from spatially dense CHARM rain gauge network?
Actual gauge values
Combined Radar – Rain Gauge Product - Summary
GAUGE OWNERSHIP MAP