5:19 p.m.
Good afternoon, F2P2 program participants.
We are hoping to get some feedback about the UDFCD Heavy Rainfall Threat
Analysis<https://qpf.udfcd.org/> (hereafter, Tool), which is part of our F2P2
program that operates from May to September. This quick survey will help us gain knowledge
about the Tool's popularity as well as how the community is using it. Should you want
more information about the Tool, you can provide an email address at the end of the
survey. Keep reading below if you'd like a description of the Tool. Thank you for your
time!
Click here to be directed to the survey: https://www.surveymonkey.com/r/SDH3WXY
Best,
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Dana McGlone, Project Meteorologist
720.943.5923 (office)
303.921.5999 (cell)
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Kevin Stewart, P.E.
Manager | Flood Warning & Information Services
URBAN DRAINAGE AND FLOOD CONTROL DISTRICT
50th ANNIVERSARY
2480 W. 26th Ave Suite 156-B | Denver, Colorado 80211
Office: 303-455-6277 | Direct: 303-749-5417 | www.udfcd.org<http://www.udfcd.org>
Protecting People, Property, and the Environment
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<https://www.facebook.com/floodcontroldistrict>
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<https://www.instagram.com/floodcontroldis/>
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<https://www.linkedin.com/groups/4605791/>
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<https://twitter.com/floodcontroldis>
-------------------- Tool Description ----------------------------
The UDFCD Heavy Rainfall Threat Analysis (hereafter, Tool) creates probabilistic
Quantitative Precipitation Forecasts (QPF) over five forecasts zones in the Denver Metro
Area by ingesting several high-resolution atmospheric models. Real-time operations began
in 2015, and the Tool updates three times daily during the warm season from May 1 to
September 30. Urban and topographic flooding can be triggered with rainfall intensities as
low as 1 inch per hour, which are common over the area during the warm season. The Tool
was generated to address the following questions on heavy rainfall days:
* What will the heaviest rain rate be?
* What locations can expect the greatest threat?
* What is the timing of the greatest threat?
* What is the probability/confidence that heavy rainfall will occur?
As mentioned, the Tool combines 4-km resolution atmospheric models from several government
agencies (NCEP, NCAR and NSSL). These models provide higher resolution QPFs than currently
available from federal agencies. To further improve forecast reliability, the QPF is
post-processed using ALERT rainfall data. The use of many models allows us to determine
the probability, and thus confidence, of heavy rainfall occurrence. The Tool has been able
to accurately anticipate the highest observed rainfall rates over 85% of the time. An
average miss rate below 6% ensures that virtually all heavy rainfall events are captured.
The Tool is also able to distinguish as to whether the heavy rainfall threat will occur in
the foothills, downtown Denver or the eastern Plains. This is critical for supporting
Emergency Managers and other stakeholders that use the information for decision support.
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We thank you in advance for your participation in this survey.
