What is the Saffir-Simpson Scale of hurricane categories?

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BULLETIN
HURRICANE GORDON INTERMEDIATE ADVISORY NUMBER 15A
NWS NATIONAL HURRICANE CENTER MIAMI FL AL082012
800 AM AST SUN AUG 19 2012

…GORDON MOVING QUICKLY EASTWARD TOWARD THE EASTERN AZORES…

SUMMARY OF 800 AM AST…1200 UTC…INFORMATION
———————————————-
LOCATION…35.1N 30.7W
ABOUT 340 MI…550 KM WSW OF SAO MIGUEL ISLAND AZORES
MAXIMUM SUSTAINED WINDS…100 MPH…155 KM/H
PRESENT MOVEMENT…E OR 80 DEGREES AT 23 MPH…37 KM/H
MINIMUM CENTRAL PRESSURE…973 MB…28.73 INCHES

WATCHES AND WARNINGS
——————–
CHANGES WITH THIS ADVISORY…

NONE.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT…

A HURRICANE WARNING IS IN EFFECT FOR…
* THE EASTERN AZORES

A HURRICANE WARNING MEANS THAT HURRICANE CONDITIONS ARE EXPECTED
SOMEWHERE WITHIN THE WARNING AREA…IN THIS CASE WITHIN 24 HOURS.
PREPARATIONS TO PROTECT LIFE AND PROPERTY SHOULD BE RUSHED TO
COMPLETION.

FOR STORM INFORMATION SPECIFIC TO YOUR AREA…PLEASE MONITOR
PRODUCTS ISSUED BY YOUR NATIONAL METEOROLOGICAL SERVICE.

DISCUSSION AND 48-HOUR OUTLOOK
——————————
AT 800 AM AST…1200 UTC…THE CENTER OF HURRICANE GORDON WAS
LOCATED NEAR LATITUDE 35.1 NORTH…LONGITUDE 30.7 WEST. GORDON IS
MOVING TOWARD THE EAST NEAR 23 MPH…37 KM/H. A TURN TOWARD THE
EAST-NORTHEAST IS EXPECTED LATER TODAY. ON THE FORECAST TRACK…THE
CENTER OF GORDON WILL BE NEAR OR OVER THE ISLANDS OF THE EASTERN
AZORES EARLY MONDAY.

MAXIMUM SUSTAINED WINDS HAVE DECREASED TO NEAR 100 MPH…155 KM/H…
WITH HIGHER GUSTS. GORDON IS A CATEGORY TWO HURRICANE ON THE
SAFFIR-SIMPSON HURRICANE WIND SCALE. ADDITIONAL WEAKENING IS
FORECAST…BUT GORDON IS STILL EXPECTED TO BE A HURRICANE WHEN IT
PASSES NEAR OR OVER THE EASTERN AZORES.

HURRICANE FORCE WINDS EXTEND OUTWARD UP TO 35 MILES…55 KM…FROM
THE CENTER…AND TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP TO 125
MILES…205 KM.

THE ESTIMATED MINIMUM CENTRAL PRESSURE IS 973 MB…28.73 INCHES.

HAZARDS AFFECTING LAND
———————-
WIND…TROPICAL STORM CONDITIONS ARE EXPECTED TO FIRST REACH THE
EASTERN AZORES LATE TODAY…WITH HURRICANE CONDITIONS EXPECTED
TONIGHT AND MONDAY.

RAINFALL…GORDON IS EXPECTED TO PRODUCE TOTAL RAINFALL AMOUNTS OF 3
TO 6 INCHES OVER THE CENTRAL AND EASTERN AZORES.

SURF…SWELLS GENERATED BY GORDON ARE EXPECTED TO REACH THE CENTRAL
AND EASTERN AZORES TODAY…CAUSING DANGEROUS SURF AND RIP CURRENT
CONDITIONS. PLEASE CONSULT PRODUCTS FROM YOUR LOCAL WEATHER OFFICE
FOR MORE INFORMATION.

HURRICANE GORDON DISCUSSION NUMBER 15
NWS NATIONAL HURRICANE CENTER MIAMI FL AL082012
500 AM AST SUN AUG 19 2012

GORDON REMAINS A WELL ORGANIZED HURRICANE BUT IT APPEARS TO HAVE
WEAKENED A LITTLE. THE LATEST DVORAK CLASSIFICATIONS FROM
TAFB…SAB…AND UW-CIMSS HAVE FALLEN SLIGHTLY FROM THE PREVIOUS
VALUES LIKELY DUE TO A SLIGHT COOLING OF THE EYE AND A THINNING OF
THE CONVECTIVE CLOUDS ON THE SOUTH SIDE OF THE CIRCULATION. THE
INITIAL WIND SPEED IS ESTIMATED TO BE 90 KT…IN AGREEMENT WITH THE
SATELLITE INTENSITY ESTIMATES. THE HURRICANE HAS NOW MOVED OVER
SUB-26C WATERS AND CURRENTLY LIES IN AN ENVIRONMENT OF MODERATE
WESTERLY SHEAR. SINCE THE SEA SURFACE TEMPERATURES DECREASE
FURTHER ON THE EXPECTED TRACK AND BECAUSE GORDON IS ANTICIPATED TO
MOVE INTO EVEN STRONGER SHEAR…STEADY WEAKENING IS FORECAST.
POST-TROPICAL TRANSITION IS ANTICIPATED TO OCCUR IN 2 TO 3
DAYS…WHEN THE VERTICAL CIRCULATION IS EXPECTED TO BECOME
SIGNIFICANTLY DECOUPLED. THE OFFICIAL FORECAST SHOWS THE
POST-TROPICAL CYCLONE DISSIPATING BY DAY 4…FOLLOWING THE GLOBAL
MODEL GUIDANCE.

GORDON CONTINUES TO MOVE SWIFTLY EASTWARD AT ABOUT 20 KT. A SHORT
WAVE TROUGH SEEN IN WATER VAPOR IMAGES NEAR 40N/40W IS SWINGING
SOUTHEASTWARD TOWARD THE HURRICANE. THIS FEATURE SHOULD CAUSE THE
CYCLONE TO TURN EAST-NORTHEASTWARD…TAKING GORDON VERY NEAR SANTA
MARIA AND SAO MIGUEL ISLANDS IN THE EASTERN AZORES IN 18 TO 24
HOURS. AFTER PASSING THE AZORES…THE WEAKENING CYCLONE IS
FORECAST TO SLOW DOWN SUBSTANTIALLY AND TURN BACK TO THE EAST
BEFORE IT DISSIPATES. THE TRACK MODEL GUIDANCE REMAINS TIGHTLY
CLUSTERED…AND THE OFFICIAL FORECAST LIES VERY NEAR THE
MULTI-MODEL CONSENSUS.

FORECAST POSITIONS AND MAX WINDS

INIT 19/0900Z 34.9N 31.6W 90 KT 105 MPH
12H 19/1800Z 35.7N 28.6W 80 KT 90 MPH
24H 20/0600Z 37.2N 25.0W 70 KT 80 MPH
36H 20/1800Z 38.6N 22.0W 60 KT 70 MPH
48H 21/0600Z 39.4N 19.4W 50 KT 60 MPH
72H 22/0600Z 39.7N 16.0W 30 KT 35 MPH…POST-TROP/REMNT LOW
96H 23/0600Z…DISSIPATED