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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

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Tropical Weather Discussion

  • Wed, 20 Sep 2017 12:01:08 +0000: NHC Atlantic Tropical Weather Discussion - NHC Tropical Weather Discussion (Atlantic)

    000
    AXNT20 KNHC 201200
    TWDAT

    Tropical Weather Discussion
    NWS National Hurricane Center Miami FL
    706 AM EDT Wed Sep 20 2017

    Tropical Weather Discussion for North America, Central America
    Gulf of Mexico, Caribbean Sea, northern sections of South
    America, and Atlantic Ocean to the African coast from the
    Equator to 32N. The following information is based on satellite
    imagery, weather observations, radar and meteorological analysis.

    Based on 0600 UTC surface analysis and satellite imagery through
    1130 UTC.

    ...SPECIAL FEATURES...

    At 20/1200 UTC, major Hurricane Maria is located near 18.2N
    66.1W or about 13 nm SSW of San Juan, Puerto Rico. The present
    movement of Maria is northwest at 9 kt. The estimated minimum
    central pressure is 921 mb. Maximum sustained winds are 130 kt
    with gusts to 160 kt, a Category 4. Numerous strong convection
    is within 120 nm of the center. Scattered moderate convection is
    elsewhere within 175 nm of the center. Maria is moving across
    Puerto Rico today, and will pass just north of the northeast
    coast of the Dominican Republic tonight and Thursday. Please see
    the latest NHC Forecast/Advisory under AWIPS/WMO headers
    MIATCMAT5/WTNT35 KNHC for more details.

    At 20/1200 UTC, Tropical Storm Jose is located about 143 nm
    south of Nantucket Massachusetts near 38.8N 70.2W, moving
    northeast at 7 kt. The estimated minimum central pressure is 976
    mb. Maximum sustained winds are 55 kt with gusts to 70 kt.
    Scattered moderate convection lays on the NW quadrant of the
    storm from 38N to 41N between 70W and 75W. The center of Jose is
    expected to pass well to the east of the New Jersey coast today,
    and pass offshore of southeastern Massachusetts Thursday. Please
    see the latest NHC Forecast/Advisory under AWIPS/WMO headers
    MIATCMAT2/WTNT22 KNHC for more details.

    ...GALE WARNING...

    A 1008 mb low in the central Atlc, or the remnants of former
    tropical cyclone Lee, are located near 18N46W. Showers and
    thunderstorms have significantly decreased near the low pressure
    area the last couple of hours. Scattered moderate convection and
    tstms are in the NE quadrant of the low center from 17N to 25N
    between 40W and 46W. Gale-force winds prevails in the NE quadrant
    of the low...within 270 nm of the center. An increase in the
    organization of the deep convection would result in the
    regeneration of Lee as it moves northward over the central
    Atlantic Ocean. There is a medium chance for tropical cyclone re-
    development within the next 48 hours.

    ...TROPICAL WAVES...

    A tropical wave is in the E Atlc with axis extending from 18N27W
    to 06N27W, moving west at 20 kt. CIRA LPW imagery show dry air
    has increased in the wave environment the last couple of hours
    due to intrusion of Saharan dry air and dust. This is limiting
    the convection to scattered moderate SW of the wave axis from
    05N to 12N between 28W and 32W.

    A tropical wave is in the W Caribbean with axis extending from
    20N85W to 07N88W, moving west at 20 kt. CIRA TPW imagery
    indicates the presence of dry air in the wave environment that
    along with strong subsidence from aloft, and strong vertical wind
    shear support lack of convection in the far NW Caribbean W of
    84W.

    ...ITCZ/MONSOON TROUGH...

    The monsoon trough extends southwest from the African coast near
    12N16W to 11N28W to 08N42W. The ITCZ extends from 08N42W to
    09N48W to 09N59W. Aside from the convection associated with the
    tropical wave, scattered moderate convection is from 04N to 11N
    between 32W and 40W.

    ...DISCUSSION...

    GULF OF MEXICO...

    Weak surface ridging prevails over the Gulf of Mexico basin with
    light and variable winds over most of the basin. Ridging aloft
    over the entire Gulf along with dry air subsidence continue to
    support clear skies, except for scattered showers and tstms over
    the Bay of Campeche due to proximity of a tropical wave that
    already moved over the EPAC waters S of Mexico. Winds will shift
    from SE to E Thursday afternoon.

    CARIBBEAN SEA...

    Category 4 Hurricane Maria is moving across Puerto Rico this
    morning. The eye of Maria is forecast to exit Puerto Rico by the
    north during the afternoon hours, and pass just north of the
    northeast coast of the Dominican Republic tonight and Thursday.
    See the special features section for further details. Low level
    wind convergence east of a tropical wave in the western Caribbean
    is producing a large area of isolated showers and tstms in the SW
    Caribbean from S of 15N W of 77W. Scatterometer data shows mainly
    light to gentle trade winds west of 71W, with the remainder of
    the basin N of 12N experiencing cyclonic winds associated with
    Hurricane Maria.

    ...HISPANIOLA...

    Scattered showers are in the Mona Passage and E Dominican
    Republic adjacent waters. Mostly fair weather prevails across
    the island. However, weather conditions will deteriorate across
    the Island this morning associated with the rainbands of
    Hurricane Maria moving across Puerto Rico. These showers will
    increase as the system moves NW very close of the Island on Thu.

    ATLANTIC OCEAN...

    Please refer to Special Features section for more information on
    Hurricanes Maria and Tropical Storm Jose. There is a gale warning
    associated with the remnants of former tropical cyclone Lee along
    with scattered moderate convection. See gale warning section
    above. A surface trough over the central Atlantic extends from
    32N41W to 30N42W to 25N44W. Scattered moderate convection is
    observed east of the trough north of 23N between 38W-44W. The
    remainder of the basin remains under the influence of a broad
    surface ridge centered north of the area.

    For additional information please visit
    http://www.hurricanes.gov/marine

    $$
    Ramos

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