Public Information Statement
Issued by NWS San Juan, PR

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NOCA42 TJSJ 031839
PNSSJU
PRZ001>013-VIZ001-002-040645-

Public Information Statement
National Weather Service SAN JUAN PR
Issued by National Weather Service Miami FL
239 PM AST Tue Oct 3 2017

To:       Subscribers:
          -Family of Services
          -NOAA Weather Wire Service
          -Emergency Managers Weather Information Network
          -NOAAPORT
          -Other NWS Partners and NWS Employees

From:     Southeast River Forecast Center

Subject:  Update - Impacts of TJUA NEXRAD Outage on Quantitative Precipitation Estimates

The WSR-88D NEXRAD radar on the Island of Puerto Rico was severely damaged during
Hurricane Maria.  A full engineering assessment is needed on the current damages to the radar.
At this time, it is too early to speculate when the radar will be back online.

Hourly precipitation estimates from the WSR-88D NEXRAD radar were used to compare to
ground truth rainfall gauge reports to derive a best quantitative precipitation estimate (QPE)
across the island of Puerto Rico.

It is important to be aware of the quality of the data (QPE) for the duration that the radar is out of
operation.  With the loss of the radar, the QPEs will be based on the Hydro-Estimator (satellite
plus rainfall gauge reports).

Studies have shown that algorithms which combine sensor inputs -- radar, gauge, satellite --
yield more accurate precipitation estimates than those which rely on a single sensor (i.e.
radar-only, gauge-only, satellite-only).

Hourly QPE can be found at http://www.srh.noaa.gov/ridge2/RFC_Precip/
Daily, Monthly and Yearly QPE can be found at http://water.weather.gov/precip/

$$



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