Public Information Statement
022 NOUS42 KTAE 150907 PNSTAE FLZ017>019-027-028-118-127-128-152000- PUBLIC INFORMATION STATEMENT NATIONAL WEATHER SERVICE TALLAHASSEE FL 507 AM EDT Tue Oct 15 2013 TO: Emergency management officials, news media, and other users. Effective at 1200 UTC (7 am EST) on Tuesday, February 25, 2014, the National Weather Service in Tallahassee will change the reporting of observations for the stream gage at Lamont on the Aucilla River from a stage value in feet above gage zero (the gage datum) to an elevation height given in feet above the National Geodetic Vertical Datum of 1929 (NGVD29). This change will match with the observational data reported by the United States Geologic Survey. Because of this change, starting on Tuesday, February 25, 2014, every observation appearing on the Advanced Hydrologic Prediction Service or AHPS for the Aucilla River at Lamont will be 42.9 feet higher than it would be if the height were provided in the gage zero datum. Additionally, the minor flood stage for the Aucilla River at Lamont is also being increased an additional 2.1 feet at the time of this datum change to better match with flood impacts along the river. Changing the reporting observations to height above NGVD29 require modification of the moderate and major flood stages for the Aucilla River at Lamont. The new flood categories for the Aucilla River at Lamont will be: 1. Action stage of 52.0 feet above NGVD29. The previous action stage was 9.0 feet above gage zero. 2. Minor flood stage of 54.0 feet above NGVD29. The previous minor flood stage was 9.0 feet above gage zero. 3. Moderate flood stage of 57.0 feet above NGVD29. The previous moderate flood stage was 14.0 feet above gage zero. 4. Major flood stage of 63.0 feet above NGVD29. The previous major flood stage was 20.0 feet above gage zero. These changes for the Aucilla River at Lamont are a direct result of coordination between the National Weather Service in Tallahassee, the emergency management agencies in Taylor, Jefferson, and Madison Counties as well as the Suwannee River Water Management District to improve flood forecast and warning services for the Aucilla River. The data for this river forecast point are provided by our partner, the United States Geological Survey. Without this critical data, forecasts and warnings would not be able to be provided at this location. You can learn more about this and other Florida stream gages by visiting: http://fl.water.usgs.gov To get the latest information on this and other river forecast points, please visit our website at: http://water.weather.gov/ahps2/index.php?wfo=tae River forecasts and warning services for this forecast point are supported by the National Weather Service in Tallahassee. You can learn more about the National Weather Service in Tallahassee by visiting our website at: http://www.weather.gov/tallahassee For further information regarding this change, please contact: Kelly G.Godsey Jane A. Hollingsworth Meteorologist Meteorologist in Charge NWS Tallahassee Florida NWS Tallahassee Florida Love Building Love Building Florida State University Florida State University Tallahassee, Florida 32306-4509 Tallahassee, Florida 32306-4509 850-942-8833 850-942-8833 $$