[nws-changes] 20110803: HWRF-Fwd: ADMIN NOTICE NOUS42 KWNO

• To: nws-changes@xxxxxxxxxxxxxxxx
• Subject: [nws-changes] 20110803: HWRF-Fwd: ADMIN NOTICE NOUS42 KWNO
• From: Linda Miller <lmiller@xxxxxxxxxxxxxxxx>
• Date: Wed, 03 Aug 2011 15:17:03 -0600

-------- Original Message --------

521
NOUS42 KWNO 032115
ADMNFD


SENIOR DUTY METEOROLOGIST NWS ADMINISTRATIVE MESSAGE
NWS NCEP CENTRAL OPERATIONS CAMP SPRINGS MD
2113Z WED AUG 03 2011

A CHANGE TO THE HWRF MODEL SAS DEEP CONVECTION PARAMETERIZATION
SCHEME WAS IMPLEMENTED AS OF THE 18Z WED AUG 3 2011 CYCLE TO
CORRECT AN OUT-OF-BOUND ARRAY PROBLEM AND TO PREVENT RELATED MODEL
FAILURES.

TESTING AND EVALUATION FROM THE 2010 AND 2011 SEASONS SHOWED THIS
CHANGE ALSO RESULTED IN:

1. A LARGE REDUCTION IN NORTHWARD BIAS OFTEN SEEN IN EASTERN
PACIFIC HURRICANE TRACKS.

2. A 35 PERCENT IMPROVEMENT IN HURRICANE TRACK FORECAST ERRORS AND
A 20 PERCENT IMPROVEMENT IN INTENSITY FORECASTS.


$$

HANDEL/SDM/NCO/NCEP