-------- Original Message --------
NCEP recently discovered that modifications made to the WCOSS NAM
land-surface model inadvertently created a near-surface cool/moist bias
over urban areas. The biases are most pronounced during heat wave/high
humidity events and are isolated to the largest metropolitan areas. A
correction for the problem has been found and test results from 12
continuous parallel cycles of the NAM starting 26 July at 1800UTC
confirm that the near surface cool/moist bias in urban areas is removed.
This change has been implemented effective with the 18z 30 July NAM run.
Christine Caruso Magee
Team Lead, Production Control
NWS/NCEP/NCO/Production Management Branch
301-683-3905
chris.caruso.magee@xxxxxxxx <mailto:chris.caruso.magee@xxxxxxxx>
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