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-------- 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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