TROPICAL STORM HARVEY BRIEFING
TROPICAL STORM HARVEY BRIEFING 8:00 AM CDT Monday, August 28, 2017 Prepared by: Brian Hoeth, SR ROC Jason Johnson, on behalf of WGRFC www.weather.gov
Current Storm Total Rainfall and River Flood Status Tropical Storm Harvey
8/28/2017 7:41 AM
SR ROC REGIONAL OPERATIONS CENTER
www.weather.gov
24 Storm Total Rainfall
SR ROC REGIONAL OPERATIONS CENTER
Tropical Storm Harvey
•
•
•
8/28/2017 7:41 AM
Maximum rainfall in Liberty/Chambers Counties with near 16” of rainfall in 24 hours Another 12” to 17” inches in parts of Harris County Waller County near Brookshire received nearly 16” of rainfall
www.weather.gov
Current Situation in Houston Tropical Storm Harvey
8/28/2017 7:41 AM
SR ROC REGIONAL OPERATIONS CENTER
www.weather.gov
Areal and Flash Flood Warnings and Advisories
REGIONAL OPERATIONS CENTER
Tropical Storm Harvey
• •
SR ROC
Still a significant threat for flooding, but flash flood warnings & emergencies not as widespread as yesterday. Flash Flood potential (Watches) through Wednesday for central into southeast TX through Wednesday and through Thursday for extreme southeast TX
Flash Flood Watches and Warnings 8/28/2017 7:41 AM
Areal Flood Advisories and Warnings www.weather.gov
Situation Overview Tropical Storm Harvey
SR ROC REGIONAL OPERATIONS CENTER
Seeing 40mph winds in/around the center Slight restrengthening (to 45 mph) possible after the center moves further off the coast later today and Tuesday Slow southeastward motion today then a slow northeastward motion Tuesday Storm speed increases a bit by Wednesday with the center of the storm forecast to be into east Texas by Thursday 8/28/2017 7:41 AM
www.weather.gov
Threat Levels
SR ROC REGIONAL OPERATIONS CENTER
Tropical Storm Harvey
Threat Level Extreme High Moderate Low None
Winds 8/28/2017 7:41 AM
Surge
Rainfall/ Flooding
Tornadoes www.weather.gov
Current Radar View Tropical Storm Harvey
SR ROC REGIONAL OPERATIONS CENTER
• Slight break in/around the Houston/Galveston area has occurred over the past few hours and may continue through the morning, but areas of heavy rain for Houston metro area likely this afernoon and evening • Strongest rain bands this morning have been over extreme southeast Texas (Beaumont/Port Arthur/Orange) and this heavy rain threat will continue today 8/28/2017 7:41 AM
www.weather.gov
What Might Be Possible Today Note: This is one model’s depiction of what could happen. Exact locations will be different
8/28/2017 7:41 AM
SR ROC REGIONAL OPERATIONS CENTER
www.weather.gov
Forecast Rainfall Thru Tuesday Morning
SR ROC REGIONAL OPERATIONS CENTER
Tropical Storm Harvey
Another 2-5+” of rainfall forecast for today for most counties in flood impact zone Isolated higher amounts are expected Already causing threatening flash and river flooding
Note: There will be locally higher amounts 8/28/2017 7:41 AM
www.weather.gov
3-Day Forecast Rainfall Thru Thursday Morning
8/28/2017 7:41 AM
SR ROC REGIONAL OPERATIONS CENTER
www.weather.gov
Excessive Rainfall Outlook
SR ROC REGIONAL OPERATIONS CENTER
Tropical Storm Harvey
Monday
Tuesday
Wednesday
8/28/2017 7:41 AM
www.weather.gov
Expected Storm Total Rainfall
SR ROC REGIONAL OPERATIONS CENTER
Tropical Storm Harvey Note: There will likely be locally higher amounts
8/28/2017 7:41 AM
7 Day Total Rainfall Additional 15-25” of rain possible over the upper Texas coast through Friday … This is on top of what has already fallen Low confidence forecast www.weather.gov
River Flooding Forecast
SR ROC REGIONAL OPERATIONS CENTER
Tropical Storm Harvey
•
•
Flood Criteria No Flooding Action Minor
•
Purple squares represent points that are forecast to reach MAJOR or RECORD flooding Record flooding means that the impacts are unknown and beyond anything experienced Devastating flooding potential with this storm
Moderate Major 8/28/2017 7:41 AM
www.weather.gov
Tornado Potential Tropical Storm Harvey
8/28/2017 7:41 AM
SR ROC REGIONAL OPERATIONS CENTER
www.weather.gov
Summary Tropical Storm Harvey
SR ROC REGIONAL OPERATIONS CENTER
Threat for additional heavy rainfall continues into Wednesday with episodic heavy rain bands
The resulting river flooding will linger for weeks
8/28/2017 7:41 AM
Many locations are already in major flood or forecast to rise into major flood; some are also in record flooding
www.weather.gov
TROPICAL STORM HARVEY BRIEFING
The Next Briefing Will Be: Tuesday at 8:00 AM CDT You can get the latest graphics and information on this storm at www.hurricanes.gov www.weather.gov
Current Storm Total Rainfall and River Flood Status Tropical Storm Harvey
8/28/2017 7:41 AM
SR ROC REGIONAL OPERATIONS CENTER
www.weather.gov
24 Storm Total Rainfall
SR ROC REGIONAL OPERATIONS CENTER
Tropical Storm Harvey
•
•
•
8/28/2017 7:41 AM
Maximum rainfall in Liberty/Chambers Counties with near 16” of rainfall in 24 hours Another 12” to 17” inches in parts of Harris County Waller County near Brookshire received nearly 16” of rainfall
www.weather.gov
Current Situation in Houston Tropical Storm Harvey
8/28/2017 7:41 AM
SR ROC REGIONAL OPERATIONS CENTER
www.weather.gov
Areal and Flash Flood Warnings and Advisories
REGIONAL OPERATIONS CENTER
Tropical Storm Harvey
• •
SR ROC
Still a significant threat for flooding, but flash flood warnings & emergencies not as widespread as yesterday. Flash Flood potential (Watches) through Wednesday for central into southeast TX through Wednesday and through Thursday for extreme southeast TX
Flash Flood Watches and Warnings 8/28/2017 7:41 AM
Areal Flood Advisories and Warnings www.weather.gov
Situation Overview Tropical Storm Harvey
SR ROC REGIONAL OPERATIONS CENTER
Seeing 40mph winds in/around the center Slight restrengthening (to 45 mph) possible after the center moves further off the coast later today and Tuesday Slow southeastward motion today then a slow northeastward motion Tuesday Storm speed increases a bit by Wednesday with the center of the storm forecast to be into east Texas by Thursday 8/28/2017 7:41 AM
www.weather.gov
Threat Levels
SR ROC REGIONAL OPERATIONS CENTER
Tropical Storm Harvey
Threat Level Extreme High Moderate Low None
Winds 8/28/2017 7:41 AM
Surge
Rainfall/ Flooding
Tornadoes www.weather.gov
Current Radar View Tropical Storm Harvey
SR ROC REGIONAL OPERATIONS CENTER
• Slight break in/around the Houston/Galveston area has occurred over the past few hours and may continue through the morning, but areas of heavy rain for Houston metro area likely this afernoon and evening • Strongest rain bands this morning have been over extreme southeast Texas (Beaumont/Port Arthur/Orange) and this heavy rain threat will continue today 8/28/2017 7:41 AM
www.weather.gov
What Might Be Possible Today Note: This is one model’s depiction of what could happen. Exact locations will be different
8/28/2017 7:41 AM
SR ROC REGIONAL OPERATIONS CENTER
www.weather.gov
Forecast Rainfall Thru Tuesday Morning
SR ROC REGIONAL OPERATIONS CENTER
Tropical Storm Harvey
Another 2-5+” of rainfall forecast for today for most counties in flood impact zone Isolated higher amounts are expected Already causing threatening flash and river flooding
Note: There will be locally higher amounts 8/28/2017 7:41 AM
www.weather.gov
3-Day Forecast Rainfall Thru Thursday Morning
8/28/2017 7:41 AM
SR ROC REGIONAL OPERATIONS CENTER
www.weather.gov
Excessive Rainfall Outlook
SR ROC REGIONAL OPERATIONS CENTER
Tropical Storm Harvey
Monday
Tuesday
Wednesday
8/28/2017 7:41 AM
www.weather.gov
Expected Storm Total Rainfall
SR ROC REGIONAL OPERATIONS CENTER
Tropical Storm Harvey Note: There will likely be locally higher amounts
8/28/2017 7:41 AM
7 Day Total Rainfall Additional 15-25” of rain possible over the upper Texas coast through Friday … This is on top of what has already fallen Low confidence forecast www.weather.gov
River Flooding Forecast
SR ROC REGIONAL OPERATIONS CENTER
Tropical Storm Harvey
•
•
Flood Criteria No Flooding Action Minor
•
Purple squares represent points that are forecast to reach MAJOR or RECORD flooding Record flooding means that the impacts are unknown and beyond anything experienced Devastating flooding potential with this storm
Moderate Major 8/28/2017 7:41 AM
www.weather.gov
Tornado Potential Tropical Storm Harvey
8/28/2017 7:41 AM
SR ROC REGIONAL OPERATIONS CENTER
www.weather.gov
Summary Tropical Storm Harvey
SR ROC REGIONAL OPERATIONS CENTER
Threat for additional heavy rainfall continues into Wednesday with episodic heavy rain bands
The resulting river flooding will linger for weeks
8/28/2017 7:41 AM
Many locations are already in major flood or forecast to rise into major flood; some are also in record flooding
www.weather.gov
TROPICAL STORM HARVEY BRIEFING
The Next Briefing Will Be: Tuesday at 8:00 AM CDT You can get the latest graphics and information on this storm at www.hurricanes.gov www.weather.gov
