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Saffir-Simpson Hurricane Scale
Category Wind Speed Storm Surge
  mph ft
5 ≥157 >18
4 130–156 13–18
3 111–129 9–12
2 96–110 6–8
1 74–95 4–5
Additional Classifications
Tropical Storm 39–73 0–3
Tropical Depression 0–38 0
The Saffir-Simpson Hurricane Scale is a classification used for most Western Hemisphere tropical cyclones that exceed the intensities of "tropical depressions" and "tropical storms", and thereby become hurricanes. Source: Intellicast

Number Of Storms Per 100 Yrs



Number of Storms per 100 Years
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00Z Runs of TC Genesis Probability Ensemble-based Probability (%) of TC Genesis Consensus (NCEP, CMC and ECMWF) 0-48 Hours 0-120 Hours 120-240 Hours Ensemble-based Probability (%) of TC Genesis Consensus (NCEP) 0-48 Hours 0-120 Hours 120-240 Hours 12Z Runs of TC Genesis Probability Ensemble-based Probability (%) of TC Genesis Consensus (NCEP, CMC and ECMWF) 0-48 Hours 0-120 Hours 120-240 Hours Ensemble-based Probability (%) of TC Genesis Consensus (NCEP) 0-48 Hours 0-120 Hours 120-240 Hours

Atlantic Basin Storm Count Since 1850


Atlantic Basin Storm Count Since 1850

Hurricane Strike Percentages

[Map of return period in years for hurricanes passing within 50 nautical miles]
Estimated return period in years for hurricanes passing within 50 nautical miles of various locations on the U.S. Coast
[Map of return period in years for major hurricanes passing within 50 nautical miles]
Estimated return period in years for MAJOR passing within 50 nautical miles of various locations on the U.S. Coast

CONUS Hurricane Strikes

1950-2017
[Map of 1950-2017 CONUS Hurricane Strikes]
Total Hurricane Strikes 1900-2010 Total Hurricane Strikes 1900-2010 Total MAJOR Hurricane Strikes 1900-2010 Total Major Hurricane Strikes 1900-2010 Western Gulf Hurricane Strikes Western Gulf Hurricane Strikes Western Gulf MAJOR Hurricane Strikes Western Gulf Major Hurricane Strikes Eastern Gulf Hurricane Strikes Eastern Gulf Hurricane Strikes Eastern Gulf MAJOR Hurricane Strikes Eastern Gulf Major Hurricane Strikes SE Coast Hurricane Strikes SE Coast Hurricane Strikes SE Coast MAJOR Hurricane Strikes SE Coast Major Hurricane Strikes NE Coast Hurricane Strikes NE Coast Hurricane Strikes NE Coast MAJOR Hurricane Strikes NE Coast Major Hurricane Strikes

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Tropical Storm Gamma – 2020 Hurricane Season

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ATTENTION: The NHC has issued it's last advisory on Gamma as of 10-6-2020. All Graphics and Information on this page will eventually cease to update.

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NHC Public Advisory on Gamma
  • Sun, 15 Nov 2020 14:30:49 +0000: Atlantic Post-Tropical Cyclone Theta Advisory Number 23 - Atlantic Post-Tropical Cyclone Theta Advisory Number 23

    000
    WTNT35 KNHC 151430
    TCPAT5

    BULLETIN
    Post-Tropical Cyclone Theta Advisory Number 23
    NWS National Hurricane Center Miami FL AL302020
    300 PM GMT Sun Nov 15 2020

    ...THETA BECOMES A REMNANT LOW...
    ...THIS IS THE LAST ADVISORY...


    SUMMARY OF 300 PM GMT...1500 UTC...INFORMATION
    ----------------------------------------------
    LOCATION...31.5N 18.2W
    ABOUT 670 MI...1080 KM SE OF THE AZORES
    MAXIMUM SUSTAINED WINDS...30 MPH...45 KM/H
    PRESENT MOVEMENT...N OR 360 DEGREES AT 2 MPH...4 KM/H
    MINIMUM CENTRAL PRESSURE...1010 MB...29.83 INCHES


    WATCHES AND WARNINGS
    --------------------
    There are no coastal watches or warnings in effect.


    DISCUSSION AND OUTLOOK
    ----------------------
    At 300 PM GMT (1500 UTC), the center of Post-Tropical Cyclone Theta
    was located near latitude 31.5 North, longitude 18.2 West. The
    post-tropical cyclone is moving toward the north near 2 mph (4 km/h)
    and a faster north or north-northeast motion is forecast for a day
    or two until the low dissipates.

    Maximum sustained winds are near 30 mph (45 km/h) with higher gusts.
    The low should gradually decay and dissipate by Tuesday.

    The estimated minimum central pressure is 1010 mb (29.83 inches).


    HAZARDS AFFECTING LAND
    ----------------------
    None.


    NEXT ADVISORY
    -------------
    This is the last public advisory issued by the National Hurricane
    Center on this system. Additional information on this system can be
    found in High Seas Forecasts issued by the UK Met Office under WMO
    header FQNT21 EGRR and on the web at
    metoffice.gov.uk/weather/specialist-forecasts/coast-and-sea/high-
    seas-forecast/.

    $$
    Forecaster Blake

NHC Forecast Advisory on Gamma
  • Tue, 06 Oct 2020 02:31:10 +0000: Atlantic Post-Tropical Cyclone GAMMA Forecast/Advi... - Atlantic Post-Tropical Cyclone GAMMA Forecast/Advisory Number 15 NWS NATIONAL Hurricane CENTER MIAMI FL AL252020 0300 UTC TUE OCT 06 2020 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. POST-TROPICAL Cyclone CENTER LOCATED NEAR 21.6N 88.4W AT 06/0300Z POSITION ACCURATE WITHIN 30 NM PRESENT MOVEMENT TOWARD THE SOUTHWEST OR 220 DEGREES AT 5 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1005 MB MAX SUSTAINED WINDS 30 KT WITH GUSTS TO 40 KT. 12 FT SEAS.. 90NE 0SE 120SW 270NW. WINDS AND SEAS VARY GREATLY IN EACH QUADRANT. RADII IN NAUTICAL MILES ARE THE LARGEST RADII EXPECTED ANYWHERE IN THAT QUADRANT. REPEAT...CENTER LOCATED NEAR 21.6N 88.4W AT 06/0300Z AT 06/0000Z CENTER WAS LOCATED NEAR 21.9N 88.2W FORECAST VALID 06/1200Z 21.1N 88.9W...POST-TROP/INLAND MAX WIND 30 KT...GUSTS 40 KT. FORECAST VALID 07/0000Z 20.2N 89.6W...POST-TROP/INLAND MAX WIND 25 KT...GUSTS 35 KT. FORECAST VALID 07/1200Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 21.6N 88.4W THIS IS THE LAST FORECAST/Advisory ISSUED BY THE NATIONAL HURRICANE CENTER ON THIS SYSTEM ADDITIONAL INFORMATION ON THIS SYSTEM CAN BE FOUND IN HIGH SEAS FORECASTS ISSUED BY THE NATIONAL WEATHER SERVICE...UNDER AWIPS HEADER NFDHSFAT1 AND WMO HEADER FZNT01 KWBC. $$ FORECASTER ZELINSKY

    000
    WTNT25 KNHC 060231
    TCMAT5

    POST-TROPICAL CYCLONE GAMMA FORECAST/ADVISORY NUMBER 15
    NWS NATIONAL HURRICANE CENTER MIAMI FL AL252020
    0300 UTC TUE OCT 06 2020

    THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT.

    POST-TROPICAL CYCLONE CENTER LOCATED NEAR 21.6N 88.4W AT 06/0300Z
    POSITION ACCURATE WITHIN 30 NM

    PRESENT MOVEMENT TOWARD THE SOUTHWEST OR 220 DEGREES AT 5 KT

    ESTIMATED MINIMUM CENTRAL PRESSURE 1005 MB
    MAX SUSTAINED WINDS 30 KT WITH GUSTS TO 40 KT.
    12 FT SEAS.. 90NE 0SE 120SW 270NW.
    WINDS AND SEAS VARY GREATLY IN EACH QUADRANT. RADII IN NAUTICAL
    MILES ARE THE LARGEST RADII EXPECTED ANYWHERE IN THAT QUADRANT.

    REPEAT...CENTER LOCATED NEAR 21.6N 88.4W AT 06/0300Z
    AT 06/0000Z CENTER WAS LOCATED NEAR 21.9N 88.2W

    FORECAST VALID 06/1200Z 21.1N 88.9W...POST-TROP/INLAND
    MAX WIND 30 KT...GUSTS 40 KT.

    FORECAST VALID 07/0000Z 20.2N 89.6W...POST-TROP/INLAND
    MAX WIND 25 KT...GUSTS 35 KT.

    FORECAST VALID 07/1200Z...DISSIPATED

    REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 21.6N 88.4W

    THIS IS THE LAST FORECAST/ADVISORY ISSUED BY THE NATIONAL HURRICANE
    CENTER ON THIS SYSTEM ADDITIONAL INFORMATION ON THIS SYSTEM CAN BE
    FOUND IN HIGH SEAS FORECASTS ISSUED BY THE NATIONAL WEATHER
    SERVICE...UNDER AWIPS HEADER NFDHSFAT1 AND WMO HEADER FZNT01 KWBC.


    $$
    FORECASTER ZELINSKY


NHC Discussion on Gamma
  • Tue, 06 Oct 2020 02:31:40 +0000: Atlantic Post-Tropical Cyclone Gamma Discussion Number 15 - Atlantic Post-Tropical Cyclone Gamma Discussion Number 15

    000
    WTNT45 KNHC 060231
    TCDAT5

    Post-Tropical Cyclone Gamma Discussion Number 15
    NWS National Hurricane Center Miami FL AL252020
    1000 PM CDT Mon Oct 05 2020

    Gamma was entirely devoid of convection for most of the day. Shortly
    before sunset, a few disorganized thunderstorms developed to the
    southeast of the cyclone's center, however these appear to be forced
    at least in part by a sea breeze boundary and are not exclusively
    associated with Gamma. A few other small cells of convection have
    developed to the west of Gamma's center during the past hour or so,
    but not nearly enough to be considered sufficiently organized to
    meet the requirement for a tropical cyclone. Gamma is therefore now
    considered to be post-tropical and this will be the last NHC
    advisory.

    The cyclone could still produce some additional disorganized
    convection and periods of heavy rain overnight as it moves inland
    over the Yucatan peninsula, but this is not expected to result in
    significant regeneration. Some of this rain could impact areas that
    are preparing for the much more significant approach of Hurricane
    Delta in a day or so. The cyclone is moving southwestward near
    5 kt, and this should continue for another day or so until it
    dissipates. The winds associated with Gamma's remnants should
    gradually weaken through that time, though the system could still
    produce a few areas of heavy rain over southeastern Mexico.

    It is worth noting that several model trackers, and consequently
    the consensus aids, depict that Gamma will move northward over the
    Gulf of Mexico and strengthen significantly in a couple of days.
    This is because the trackers lose track of Gamma when it dissipates
    and start following nearby Hurricane Delta instead. In reality, no
    models forecast that Gamma will remain a well-defined cyclone for
    more than another day or two.


    FORECAST POSITIONS AND MAX WINDS

    INIT 06/0300Z 21.6N 88.4W 30 KT 35 MPH...POST-TROPICAL
    12H 06/1200Z 21.1N 88.9W 30 KT 35 MPH...POST-TROP/INLAND
    24H 07/0000Z 20.2N 89.6W 25 KT 30 MPH...POST-TROP/INLAND
    36H 07/1200Z...DISSIPATED

    $$
    Forecaster Zelinsky

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