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Author Topic: Change in Red-Flag criteria  (Read 6294 times)

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Offline Wrightwood

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Change in Red-Flag criteria
« on: Apr 15, 10, 09:19:53 PM »
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Offline Wrightwood

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Re: Change in Red-Flag criteria
« Reply #1 on: Apr 15, 10, 11:22:36 PM »
Quote from: ECSWXSUPPORT on Apr 15, 10, 10:38:35 PM
PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
800 AM PDT THU APR 15 2010

...NEW RED FLAG WARNING CRITERIA EFFECTIVE APRIL 15 2010...

EFFECTIVE THURSDAY, APRIL 15, 2010...THE NATIONAL WEATHER SERVICE
FORECAST OFFICE IN SAN DIEGO CA WILL BE MAKING CHANGES TO THE RED
FLAG WARNING CRITERIA. THE CHANGE INVOLVES THE REMOVAL OF THE LONG
DURATION, LOW RELATIVE HUMIDITY CRITERION (RH <= 10% FOR >=10 HOURS)
FROM THE RED FLAG WARNING CRITERIA. THIS CHANGE WILL AFFECT ALL
COASTAL, VALLEY, AND MOUNTAIN ZONES WITHIN WFO SAN DIEGO'S COUNTY
WARNING AREA INCLUDING CAZ242, CAZ243, CAZ248, CAZ250, CAZ255,
CAZ256, CAZ257, AND CAZ258.


NEW RED FLAG CRITERIA (EFFECTIVE APRIL 15 2010):

1) RH <= 15% WITH SUSTAINED WINDS >= 25 MPH AND/OR FREQUENT WIND
   GUSTS >= 35 MPH FOR >= 6 HOURS.

2) DRY LIGHTNING (MORE THAN ISOLATED COVERAGE).


IF YOU HAVE QUESTIONS REGARDING THE CHANGE IN RED FLAG WARNING
CRITERIA, PLEASE CONTACT THE WFO AT

  OFFICE CONTACT: WFO SAN DIEGO
  ADDRESS: 11440 W. BERNARDO CT., SUITE 230, SAN DIEGO, CA 92127   
  PHONE 858.675.8700

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