Tropical Storm Hermine & it’s Impact on Texas Steven Vargas, PE.

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Presentation transcript:

Tropical Storm Hermine & it’s Impact on Texas Steven Vargas, PE

Introduction Tropical Storm Hermine formed off the Bay of Campeche on September 3, Tropical Storm Hermine formed off the Bay of Campeche on September 3, Over the next several days, Hermine produced record- setting rainfall, flooding and damage in Texas and primarily up and down the IH-35 corridor. Over the next several days, Hermine produced record- setting rainfall, flooding and damage in Texas and primarily up and down the IH-35 corridor. Because of the magnitude of flooding, the governor of Texas declared those areas affected by the storm as disaster areas. Because of the magnitude of flooding, the governor of Texas declared those areas affected by the storm as disaster areas.

Flooding after TS Hermine 8 fatalities Over $115 million in property damage

Project Purpose Perform an evaluation of the storm and its consequences in Texas Storm Track Storm Track Precipitation Precipitation Stream discharge Stream discharge Flooding area Flooding area Better understand water resource data and how to integrate different source data using ArcGIS

Data Sources tropical cyclone track GIS data at: National Hurricane Center provides historical tropical cyclone track GIS data at: National Climate Data Center provides NEXRAD Radar rainfall data at: NHDplus provided surface water dataset of Texas USGS stream gages & real time dataset NEXRAD historical radar

Storm History &Track

Storm Precipitation Rain gages Rain gages -419 rain gages operated by National Weather Service (NWS) in Texas Radar data Radar data -NEXRAD collected rainfall radar data

Landfall Radar on Sept 7, 2010

Storm Total Rainfall

Normal Rainfall for Sept 2010

Observed Rainfall for Sept 2010

Departure from Normal Rainfall for Sept 2010

Departure from Normal Rainfall for Sept 2010 as Percentage

Rainfall totals from TS Hermine for Sept 6-9,2010.

One-Day Rainfall totals from TS Hermine on Sept 8, 2010.

Texas Waterways-ArcGIS Layer

USGS Texas Gauge Locations

TX Mean Annual Flow (cfs)

TX Stream Flow Maxima (cfs) during Hermine Storm Event

Conclusion Tropical Storm Hermine was a damaging tropical storm that hit areas within the IH-35 corridor particularly hard. Tropical Storm Hermine was a damaging tropical storm that hit areas within the IH-35 corridor particularly hard. It wasn’t a particularly abnormal storm but the training effect of rain bands made it destructive. It wasn’t a particularly abnormal storm but the training effect of rain bands made it destructive. Area infrastructure was not adequate to mitigate the subsequent flooding. Area infrastructure was not adequate to mitigate the subsequent flooding.

Questions?