Correct 10 m wind on 7 April

• The change to the 10 m wind diagnosis is in response to an inadvertent change that was implemented when operations were being established on the IBM SP following the fire in the Cray C-90. We had been testing ways to correct a low bias in 10 m wind speeds in the mountainous west and a code change that resulted in stronger winds everywhere was mistakenly implemented on the IBM. This change had the desired effect over elevated terrain of increasing the diagnosed 10 m wind speeds but the change had not been localized to elevated terrain and had a negative effect over areas of lower elevation. This can be seen by comparing the statistics for the same month before and after November 1999 at our web page of near surface verifications:

• http://www.emc.ncep.noaa.gov/mmb/research/nearsfc/nearsfc.verf.html