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Product Description
Product Description
Click each image above to view the full-size image.
Product Description
Product Description
Click each image above to view the full-size image.
To re-order the way storms display, drag a storm name left or right. The left-most storm (right-most) will display at the top (bottom).
Storm Surge and Coastal Flood Hazards
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Coastal Flood Statement
Coastal Flood Advisory
Coastal Flood Watch
Coastal Flood Warning
Storm Surge Watch
Storm Surge Warning
> 1 ft above ground
> 3 ft above ground
> 6 ft above ground
> 9 ft above ground
Storm Surge Watch/Warning Description
Potential Inundation Description
Peak Storm Surge Description
Storm Surge Watches and Warnings are not issued for southern California. Please refer to Coastal Flood Watches/Warnings (if any are in effect).
Sources:
National Hurricane Center
and the
National Weather Service GIS Web Services
A storm surge watch is defined as the possibility of life-threatening inundation from a tropical cyclone, generally within 48 hours.
A storm surge warning is defined as the danger of life-threatening inundation from a tropical cyclone, generally within 36 hours.
Rainfall and Thunderstorm Forecast
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Rainfall Forecast Description
Excessive Rainfall Outlook Description
Thunderstorm Forecast Description
Sources:
Weather Prediction Center
and the
Storm Prediction Center
Fire Weather Outlook
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Fire Weather Outlook Description
Source:
Storm Prediction Center
Hydrology and Tide Links
National River Observations and Forecasts
NOAA Tides and Currents - Current Water Levels and Tide/Current Predictions
NOAA Inundation Dashboard
Hurricane Threats and Impacts Graphics FAQ
Graphics are for areas subject to active tropical cyclone wind and/or storm surge watches and warnings.
What are the Hurricane Threats and Impacts (HTI) Graphics?
HTI graphics are issued by local Weather Forecast Offices (WFOs) when tropical cyclone (i.e. hurricane or tropical storm) wind watches and warnings, and/or storm surge watches and warnings, are in effect for at least part of their land area of responsibility. Once available, they are updated by respective WFOs with each new forecast issued by the National Hurricane Center (NHC) or Central Pacific Hurricane Center (CPHC) and maintained until the threats of these hazards have locally passed. Any departure in the forecast from the actual track, size, or intensity of a hurricane can dramatically change its impacts. Through the implicit use of probability data, color-coded HTI graphics depict the potential conditions to protect against with accompanying descriptions of potential impacts needed for effective preparations. The HTI graphics account for the latest forecast at specific locations while also including a reasonable safety margin to account for any forecast errors.
What hazards are described by the HTI Graphics?
Tropical wind, storm surge, flooding rain, and tornadoes are the hazards addressed within the HTI graphics suite. Figure 1 (below) offers an example of each hazard-based HTI graphic with the NHC
Cone Graphic
superimposed (from Hurricane Irma, 2017). Since the Cone Graphic only reveals the most probable track of the center of the storm, it provides little to no information about projected impacts. The HTI graphics, however, show the geographic extent of associated hazards; their level of threat and potential impacts. Impacts often extend well-beyond the area depicted in the Cone Graphic alone. The HTI color-scale corresponds to increasing levels of threat and is graduated from warm to hot colors.
Figure 1. Example of HTI Graphics for the tropical wind, storm surge, flooding rain, and tornado hazards (left to right) from Hurricane Irma (2017).
Examining the wind graphic (above; left), locations colored in
purple
have the potential to experience winds greater than 110 mph when accounting for both the forecast and forecast error. It is not a mere depiction of forecast conditions to be expected. Rather, it indicates that these locations should be ready for winds in excess of 110 mph, when taking into account the latest forecast and knowing that (although skilled) the forecast isn't perfect. Simply put, locations in
purple
are being threatened by major hurricane force winds greater than 110 mph (at least Category 3 force), locations in
red
are being threatened by hurricane force winds between 74-110 mph (Category 1 or 2 force), and so on. A similar approach is used for depicting each of the remaining hazards. HTI is designed to help make preparedness actions more effective. For additional information about hurricane preparedness, please see
ready.gov/hurricanes
and always follow the recommended actions of local officials during an event.
How do I access the HTI Graphics webpage when my area is threatened?
The HTI Graphics suite can be accessed using the following web portal:
weather.gov/srh/tropical
It can also be accessed from most coastal WFO websites via weather.gov by clicking on a region of interest. The links will be made readily accessible from most WFO front pages during active hurricane or tropical storm events.
When you reach this portal, you will see the following tabs across the top of the page:
Figure 2. A screenshot of the tabs available at the top of the tropical web portal when tropical cyclone wind or storm surge watches and/or warning are in effect.
Click on the
Threats and Impacts
tab to display HTI information similar to what is shown below on the left side of
Figure 3
. By default, the wind hazard is initially displayed, but users can quickly select any of the radio buttons just above the graphic to retrieve information on other hazards of interest.
Figure 3. A breakdown of the graphical information provided on the tropical web portal when tropical cyclone wind or storm surge watches and/or warnings are in effect.
Select a hazard in order to display the corresponding threat map as assessed by the local WFO. A color-coded legend unique to each hazard is also provided. The map conveys
what potential conditions to protect against
by location, accounting for both the latest forecast and forecast error for improved readiness, responsiveness, and resiliency.
For safety-sake, it provides a depiction of a reasonable worst case scenario.
Once a threat map is displayed, click a map location to obtain current information on that hazard for the desired site and its vicinity. Information is extracted from local text products and displayed to the right of the map.
Location-specific forecast parameters per hazard include
what, where, when, how much,
and
how long
By clicking on a map location, users also obtain descriptions of potential impacts. These are the resulting impacts which would likely occur if the hazard were realized to its graphically depicted potential. Text descriptions are derived locally, often with input from Emergency Managers. Pop-ups are placed over the map near the selected location.
This makes threat information more relatable for users by conveying
what potential impacts to prepare for
Remember, the map is not a forecast map for the selected hazard
. Rather, it is a depiction of the forecast with a safety margin included. Consequently, text information that describes the latest forecast (without accounting for forecast error) on the right of the map may or may not match the map on the left (which does account for forecast error).
HTI can also be accessed in the National Digital Forecast Database webpage here:
Under the listing of the Tropical elements in the top left drop down menu, select the "hurricane threat" grid for the desired hazard. There, you will see the threat levels depicted as you would above; click on any given point to sample the threat level for that location. These versions will only be available through the NDFD.
The HTI Product Description Document (PDD) can be found here:
(Reload page for latest information!)
Hurricane Threats and Impacts Graphics FAQ
Map of Coastal Threats and Potential Impacts -
What's This?
Latest Forecast -
What's This?
Wind Threat
Storm Surge Threat
Flooding Rain Threat
Tornado Threat
Select a National Weather Service Office
Select a Local Product
Hurricane Local Statement from the National Weather Service in
Latest GOES-East Infrared Image (
Loop
Latest GOES-West Infrared Image (
Loop
Satellite Imagery of Various Sectors
GOES-East
Tropical Atlantic
Gulf of America
Caribbean
U.S. Atlantic Coast
Puerto Rico
Visible
Image
Loop
Image
Loop
Image
Loop
Image
Loop
Image
Loop
Infrared
Image
Loop
Image
Loop
Image
Loop
Image
Loop
Image
Loop
Water Vapor
Image
Loop
Image
Loop
Image
Loop
Image
Loop
Image
Loop
GOES-East and Meteosat
Mesoscale Sectors
Southern Plains
Southern Mississippi Valley
Southeast U.S.
East Atlantic
Visible
Sector 1
Sector 2
Image
Loop
Image
Loop
Image
Loop
Image
Loop
Infrared
Sector 1
Sector 2
Image
Loop
Image
Loop
Image
Loop
Image
Loop
Water Vapor
Sector 1
Sector 2
Image
Loop
Image
Loop
Image
Loop
Image
Loop
GOES-West
Tropical Pacific
Northern Pacific
U.S. West Coast
Pacific Southwest
Hawaii
Visible
Image
Loop
Image
Loop
Image
Loop
Image
Loop
Image
Loop
Infrared
Image
Loop
Image
Loop
Image
Loop
Image
Loop
Image
Loop
Water Vapor
Image
Loop
Image
Loop
Image
Loop
Image
Loop
Image
Loop
GOES-West
Tropical Pacific
Northern Pacific
U.S. West Coast
Pacific Southwest
Hawaii
Visible
Image
Loop
Image
Loop
Image
Loop
Image
Loop
Image
Loop
Infrared
Image
Loop
Image
Loop
Image
Loop
Image
Loop
Image
Loop
Water Vapor
Image
Loop
Image
Loop
Image
Loop
Image
Loop
Image
Loop
Sources:
National Environmental Satellite, Data, and Information Service's Center for Satellite Applications and Research
and the
Office of Satellite and Product Operations
Satellite Links
GOES-East and GOES-West Satellite Imagery
Meteosat Satellite Imagery
NCEI Satellite Archive (1966 - Present)
Advanced Scatterometer (ASCAT METOP-B)
Altimeter (Significant Wave Height)
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Source:
National Weather Service GIS Web Services
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Pop-up blocking should be disabled in order to view foreign radars.
Preparedness Brochures
Hurricane Safety Fact Sheet
Red Cross Hurricane Checklist
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Sources:
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National Weather Service
NOAA
FEMA
, and the
Red Cross
Preparedness Videos
Storm Surge
Getting Ready For Hurricanes
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