NOUS41 KWBC 131540



Service Change Notice 17-72

National Weather Service Headquarters Washington DC

1140 AM EDT Tue Jun 13 2017


To:      Subscribers:

         -NOAA Weather Wire Service

         -Emergency Manager Weather Information Network


         Other NWS partners and NWS employees


From:    Michelle Hawkins

         Severe, Fire, Public and Winter Services Branch Chief


Subject: Discontinue Experimental Holdover Threat Index 

         Product for the Elko Weather Forecast Office

         Effective July 13, 2017


The experimental holdover threat index will be discontinued

after July 13, 2017. In the Great Basin, a threat to large fire

spread occurs when relative humidity is low and strong winds

develop a day or two after a lightning event. The experimental

holdover threat index is a web graphic that displays the

expected threat of holdover fires to grow and spread within

specific fire weather forecast zones within the Weather Forecast

Office Elko county warning area.


These events have been found to occur quite infrequently.

Therefore, due to the infrequency of these events, it is not

effective to maintain this product operationally.

You may view an example by visiting the website at:


Please address your questions or comments to:


Clair Ketchum

NWS Elko, NV



NWS Service Change Notices are online at: