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-------- Original Message -------- 721 NOUS41 KWBC 061910 PNSWSHTechnical Implementation Notice 13-23
National Weather Service Headquarters Washington DC 310 PM EDT Tue Aug 6 2013To: Subscribers:
-Family of Services
-NOAA Weather Wire Service
-Emergency Managers Weather Information Network
-NOAAPORT
Other NWS Partners, Users and Employees
From: Timothy McClung
Science Plans Branch Chief
Office of Science and Technology
Subject: Temporary Change to Preemption of HIRESW:
Effective August 13, 2013
Effective on or about Tuesday, August 13, 2013, beginning with
the 1200 Coordinated Universal Time (UTC) run, the National
Centers for Environmental Prediction (NCEP) will modify the
preemption of the High-Resolution Window Forecast System
(HIRESW).
Due to resource limitations, NWS has had to cancel select HIRESW
runs during hurricane season depending on the number of hurricane
models running during that cycle. Currently, the HIRESW runs are
preempted when there are 3 or more tropical storms being run.
Because of the increased size and power of the new WCOSS
supercomputers, beginning August 13, the HIRESW runs will not be
preempted until 4 or more tropical storms are being run. This
rule will apply for the remainder of the 2013 hurricane season
only. Once the HIRESW suite is upgraded late this year or early
next year, the preemption limit likely will return to a smaller
number of storms. With a subsequent upgrade to either the
Hurricane Weather and Research Forecast (HWRF) or the HIRESW, the
preemption could begin with just 1 storm. A new Technical
Implementation Notice would alert users to such a change.
Long term, the HIRESW functionality will be covered by the High
Resolution Rapid Refresh ENSEMBLE (HRRRE), which will provide
18-24 hour guidance updated hourly, and by the Short Range
Ensemble Forecast (SREF), which will provide longer range
ensemble guidance by extending the HRRRE members to 48-60 hours,
4 times per day. This configuration (roughly 2018) will
alleviate the need for any preemption.
For questions regarding these model changes, please contact:
Geoff Dimego
NCEP/EMC, Mesoscale Modeling Branch College Park, Maryland, 20740 301-683-3764 geoff.dimego@xxxxxxxxNWS National Technical Implementation Notices are online at: http://www.nws.noaa.gov/os/notif.htm $$
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