000 NOUS42 KWNO 101951 ADMNFD SENIOR DUTY METEOROLOGIST NWS ADMINISTRATIVE MESSAGE NWS NCEP CENTRAL OPERATIONS COLLEGE PARK MD 1942Z TUE DEC 10 2019 ATTN WFOs: NWSChat will be failed over to the MO farm tomorrow (Dec 11) at 1230Z in support of Legacy NIDS patching in MD. An outage window of up to 150 minutes is possible. NWWSOI and RA4-GIFS will be failed over at 11/1500Z. Potential outage for NWWSOI is up to an hour. Shirey/SDM/NCO/NCEP