PowerPoint Presentation

Tropical Storm Debby St. Marys Flood

WeatherfolkPresented byJoel LanierSenior Service Hydrologist27 Sep 2012Debby flooding

Gainesville.com http://www.gainesville.com/article/20120626/ARTICLES/120629655 Live Oak, FlSt. Marys Flooding

St. Marys Circle

Sat 23 June

Sun 24 June

Mon 25 June

Tue 26 June

Wed 27 JuneTropical Storm Debby

Tropical Storm Debby

Tropical Storm Debby

Tropoical Storm Debby

Tropical Storm Debby

Tropical Storm DebbyUpper Level Low in SW Gulf of Mexico

21 Jun Sfc Low Developed near Yucatan

23 Jun Sfc Low moved into Gulf of Mexico Becomes TS Debby

23 Jun Heavy rain N Tampa

24 Jun Coastal Trof Develops Heavy rain E Florida Panhandle

25 Jun Cold Front Enhances Coastal Trof Heavy rain NE Florida

Tropical Storm Debby

Sat 23 JuneTropical Storm Debby

Sun 24 JuneTropical Storm Debby

Mon 25 JuneTropical Storm Debby

Tue 26 JuneTropical Storm Debby

Wed 27 JuneTropical Storm Debby - Trof

EarthSky -http://earthsky.org/earth/tropical-storm-debby-a-dangerous-slow-mover Tropical Storm Debby Loop

NOAA NWS HPCTropical Storm Debby 1hr Radar Rainfall Loop

Tropical Storm Debby Storm Total

Tropical Storm Debby Storm Total

Tropical Storm DebbySt Marys39 Flood Warnings and Statements Issued for St. Marys River at MacClennyAbove Flood Stage 26 Jun 06Z - 9 Jul 21ZRecord Crest 24.40 ft 28 Jun 07:30ZRecord Flow 36,300 CFS

St. Marys Crest History

St. Marys Crest History26,000 CFS

36,300 CFS28,100 CFS28,000 CFSNorth Prong Moniac - Flow

MacClenny - Flow

Kingsland - Flow

North Prong Moniac - Stage

MacClenny - Stage

Kingsland - Stage

Kingsland - Stream Velocity

Kingsland - Rain

Tropical Storm Debby WFO Jax Operations23 Jun Began Webinar & Video Briefings 27 Jun WFO Tallahassee Notifies WFO Jax of Historic Flood Developing on lower St. Marys27 Jun WFO Jacksonville Coordinates the Issuance of a River Flood Emergency Flood Warning for the entire length of the St. Marys River below MacClenny.

National Weather ServiceSoutheast River Forecast CenterDaily Operational Overview Message1:40 p.m. June 27, 2012

There are 18 communities currently in flood, including 8 in major flood. Moderate or Major Flooding Occurring or ExpectedMacclenny St. Marys River (MAJOR)

Tropical Storm Debby WFO Jax Operations23 Jun Began Webinar & Video Briefings 27 Jun WFO Tallahassee Notifies WFO Jax of Historic Flood Developing on lower St. Marys27 Jun WFO Jacksonville Coordinates the Issuance of a River Flood Emergency Flood Warning for the entire length of the St. Marys River below MacClenny.5 Day Storm Total 27 Jun 2012 12Z

SR 40 Flood ThreatConnection to Satilla River

SR 40 Flood Threat Connection to Satilla River

River Flood EmergencyA HISTORIC FLOOD IS OCCURRING ON THE ST. MARYS RIVER DUE TO VERYHEAVY RAINFALL FROM TROPICAL STORM DEBBY. RAPID RISES ALONG THE ST.MARYS RIVER AND ITS TRIBUTARIES ARE EXPECTED WITHIN THE NEXT 24HOURS...AND THESE FLOOD WATERS WILL AFFECT RESIDENTS ALONG THE RIVERBASIN IN NASSAU...BAKER...CHARLTON AND CAMDEN COUNTIES.

AREAS THAT DO NOT NORMALLY FLOOD ALONG THE ST. MARYS RIVER WILLFLOOD ANYWHERE ALONG THE LENGTH OF THE RIVER. EXTREME FLOODING MAYOCCUR AT FLEA HILL AND KINGS FERRY WITHIN THE NEXT 24 HOURS TO 36HOURS. OVERLAND FLOODING WILL EXTEND TO AND CONNECT WITH THE SATILLARIVER TO THE NORTH ALONG AND WEST OF THE STATE ROAD 110 IN GEORGIAEAST OF FOLKSTON.

Hydrology Overview

St. Marys to Nassau River

Nassau River Connection?Brady Branch

Brady Branch nr Bryceville, FL

Brady Branch -> Thomas Creek

Thomas Creek -> Nassau Village

Thomas Creek -> Nassau River

Possible Gage LocationsSR2 Bridge

Possible Gage Locations

Possible Gage LocationsSR1 Bridge

Questions?