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Saffir-Simpson Hurricane Scale
CategoryWind SpeedStorm Surge
 mphft
5≥157>18
4130–15613–18
3111–1299–12
296–1106–8
174–954–5
Additional Classifications
Tropical Storm39–730–3
Tropical Depression0–380
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

Beaufort Wind Scale

Number Of Storms Per 100 Yrs

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 1900-2010Western Gulf Hurricane Strikes Western Gulf Hurricane Strikes Western Gulf MAJOR Hurricane Strikes Western Gulf Major Hurricane StrikesEastern Gulf Hurricane Strikes Eastern Gulf Hurricane Strikes Eastern Gulf MAJOR Hurricane Strikes Eastern Gulf Major Hurricane StrikesSE Coast Hurricane Strikes SE Coast Hurricane Strikes SE Coast MAJOR Hurricane Strikes SE Coast Major Hurricane StrikesNE Coast Hurricane Strikes NE Coast Hurricane Strikes NE Coast MAJOR Hurricane Strikes NE Coast Major Hurricane Strikes

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November Hurricane Climatology

Tropical Storm Alpha – 2020 Hurricane Season

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Projected Path with Watches and Warnings
Projected Path with Watches and Warnings
Additional Projected Path Swath
Additional Projected Path SwathAdditional Projected Path Swath
Most Likely Arrival Time of Tropical Storm Force Winds Most Likely Arrival Time of Tropical-Storm-Force WindsMost Reasonable Arrival Time of Tropical Storm Force Winds Most Reasonable Arrival Time of Tropical-Storm-Force WindsHurricane Force Wind Probabilities Hurricane Force Wind ProbabilitiesTropical Storm Force Wind Probabilities Tropical Storm Force Wind Probabilities
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NHC Public Advisory on Alpha
  • Sat, 19 Sep 2020 02:35:55 +0000: Atlantic Post-Tropical Cyclone Alpha Advisory Number 3 - Atlantic Post-Tropical Cyclone Alpha Advisory Number 3

    000
    WTNT34 KNHC 190235
    TCPAT4

    BULLETIN
    Post-Tropical Cyclone Alpha Advisory Number 3
    NWS National Hurricane Center Miami FL AL242020
    300 AM GMT Sat Sep 19 2020

    ...SHORT-LIVED ALPHA BECOMES A REMNANT LOW OVER THE DISTRICT OF
    VISEU PORTUGAL..
    ...THIS IS THE LAST ADVISORY...


    SUMMARY OF 300 AM GMT...0300 UTC...INFORMATION
    ----------------------------------------------
    LOCATION...40.9N 6.9W
    ABOUT 1090 MI...1750 KM ENE OF THE AZORES
    MAXIMUM SUSTAINED WINDS...30 MPH...45 KM/H
    PRESENT MOVEMENT...NE OR 50 DEGREES AT 16 MPH...26 KM/H
    MINIMUM CENTRAL PRESSURE...1005 MB...29.68 INCHES


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

    Interests in Portugal should monitor the progress of Alpha.
    Additional information on this system can be found in products from
    the Portuguese Institute for Sea and Atmosphere at www.ipma.pt.


    DISCUSSION AND OUTLOOK
    ----------------------
    At 300 AM GMT (0300 UTC), the center of Post-Tropical Cyclone Alpha
    was located near latitude 40.9 North, longitude 6.9 West. The
    post-tropical cyclone is moving toward the northeast near 16 mph (26
    km/h), and this general motion is expected to continue during the
    next 12 hours or so. Alpha should move across northern Portugal and
    Spain before dissipating later today.

    Maximum sustained winds have decreased to near 30 mph (45 km/h)
    with higher gusts. The remnant low is expected to dissipate by
    Saturday night.

    The estimated minimum central pressure is 1005 mb (29.68 inches).


    HAZARDS AFFECTING LAND
    ----------------------
    WIND...Information on wind hazards from Alpha can be found in
    products from the Portuguese Institute for Sea and Atmosphere at
    www.ipma.pt.

    RAINFALL...Alpha is expected to produce storm totals of 1 to 2
    inches of rainfall, with isolated amounts of 3 inches over the
    northern portion of Portugal and into west-central Spain before rain
    tapers off later today.


    NEXT ADVISORY
    -------------
    This is the last public advisory issued by the National Hurricane
    Center on this system.

    $$
    Forecaster Roberts

NHC Forecast Advisory on Alpha
  • Sat, 19 Sep 2020 02:35:20 +0000: Atlantic Post-Tropical Cyclone ALPHA Forecast/Advi... - Atlantic Post-Tropical Cyclone ALPHA Forecast/Advisory Number 3 NWS NATIONAL Hurricane CENTER MIAMI FL AL242020 0300 UTC SAT SEP 19 2020 THERE ARE NO COASTAL TROPICAL Cyclone WATCHES OR WARNINGS IN EFFECT. INTERESTS IN PORTUGAL SHOULD MONITOR THE PROGRESS OF ALPHA. ADDITIONAL INFORMATION ON THIS SYSTEM CAN BE FOUND IN PRODUCTS FROM THE PORTUGUESE INSTITUTE FOR SEA AND ATMOSPHERE AT WWW.IPMA.PT. POST-TROPICAL CYCLONE CENTER LOCATED NEAR 40.9N 6.9W AT 19/0300Z POSITION ACCURATE WITHIN 20 NM PRESENT MOVEMENT TOWARD THE NORTHEAST OR 50 DEGREES AT 14 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1005 MB MAX SUSTAINED WINDS 25 KT WITH GUSTS TO 35 KT. 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 40.9N 6.9W AT 19/0300Z AT 19/0000Z CENTER WAS LOCATED NEAR 40.5N 7.7W FORECAST VALID 19/1200Z 42.6N 4.4W...POST-TROP/INLAND MAX WIND 20 KT...GUSTS 30 KT. FORECAST VALID 20/0000Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 40.9N 6.9W THIS IS THE LAST FORECAST/Advisory ISSUED BY THE NATIONAL HURRICANE CENTER ON THIS SYSTEM $$ FORECASTER ROBERTS

    000
    WTNT24 KNHC 190235
    TCMAT4

    POST-TROPICAL CYCLONE ALPHA FORECAST/ADVISORY NUMBER 3
    NWS NATIONAL HURRICANE CENTER MIAMI FL AL242020
    0300 UTC SAT SEP 19 2020

    THERE ARE NO COASTAL TROPICAL CYCLONE WATCHES OR WARNINGS IN EFFECT.

    INTERESTS IN PORTUGAL SHOULD MONITOR THE PROGRESS OF ALPHA.
    ADDITIONAL INFORMATION ON THIS SYSTEM CAN BE FOUND IN PRODUCTS FROM
    THE PORTUGUESE INSTITUTE FOR SEA AND ATMOSPHERE AT WWW.IPMA.PT.

    POST-TROPICAL CYCLONE CENTER LOCATED NEAR 40.9N 6.9W AT 19/0300Z
    POSITION ACCURATE WITHIN 20 NM

    PRESENT MOVEMENT TOWARD THE NORTHEAST OR 50 DEGREES AT 14 KT

    ESTIMATED MINIMUM CENTRAL PRESSURE 1005 MB
    MAX SUSTAINED WINDS 25 KT WITH GUSTS TO 35 KT.
    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 40.9N 6.9W AT 19/0300Z
    AT 19/0000Z CENTER WAS LOCATED NEAR 40.5N 7.7W

    FORECAST VALID 19/1200Z 42.6N 4.4W...POST-TROP/INLAND
    MAX WIND 20 KT...GUSTS 30 KT.

    FORECAST VALID 20/0000Z...DISSIPATED

    REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 40.9N 6.9W

    THIS IS THE LAST FORECAST/ADVISORY ISSUED BY THE NATIONAL HURRICANE
    CENTER ON THIS SYSTEM

    $$
    FORECASTER ROBERTS


NHC Discussion on Alpha
  • Sat, 19 Sep 2020 02:36:23 +0000: Atlantic Post-Tropical Cyclone Alpha Discussion Number 3 - Atlantic Post-Tropical Cyclone Alpha Discussion Number 3

    000
    WTNT44 KNHC 190236
    TCDAT4

    Post-Tropical Cyclone Alpha Discussion Number 3
    NWS National Hurricane Center Miami FL AL242020
    300 AM GMT Sat Sep 19 2020

    METEOSAT imagery, IPMA radar data, and surface observations
    indicate that Alpha has degenerated to a post-tropical remnant low
    just a few miles to the southeast of Viseu, Portugal. Therefore,
    this the last NHC advisory. Surface wind data support an initial
    intensity of 25 kt. The rapidly deteriorating small remnant low is
    expected to move generally toward the northeast at about 14 kt for
    the next 6 to 12 hours before dissipating over northern Spain by
    Saturday night. The NHC forecast track is basically an update of
    the previous advisory and lies between the tightly clustered
    deterministic guidance.

    Additional information on the hazards from this system can be found
    in products from the Portuguese Institute for Sea and Atmosphere at
    www.ipma.pt.


    FORECAST POSITIONS AND MAX WINDS

    INIT 19/0300Z 40.9N 6.9W 25 KT 30 MPH...POST-TROPICAL
    12H 19/1200Z 42.6N 4.4W 20 KT 25 MPH...POST-TROP/INLAND
    24H 20/0000Z...DISSIPATED

    $$
    Forecaster Roberts

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