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

Hurricane Season 101

The official Atlantic Basin Hurricane Season runs from June 1st to November 30th. A tropical cyclone is a warm-core, low pressure system without any “front” attached. It develops over tropical or subtropical waters, and has an organized circulation. Depending upon location, tropical cyclones have different names around the world. The Tropical Cyclones we track in the Atlantic basin are called Tropical Depressions, Tropical Storms and Hurricanes! Atlantic Basin Tropical Cyclones are classified as follows: Tropical Depression: Organized system of clouds and thunderstorms with defined surface circulation and max sustained winds of 38 mph or less. Tropical Storm: Organized system of strong thunderstorms with a defined surface circulation and maximum sustained winds of 39-73 mph. Hurricane: Intense tropical weather system of strong thunderstorms with a well-defined surface circulation. A Hurricane has max sustained winds of 74 mph or higher!

The difference between Tropical Storm and Hurricane Watches, Warnings, Advisories and Outlooks

Warnings:Listen closely to instructions from local officials on TV, radio, cell phones or other computers for instructions from local officials.Evacuate immediately if told to do so.

Storm Surge Warning: There is a danger of life-threatening inundation from rising water moving inland from the shoreline somewhere within the specified area. This is generally within 36 hours. If you are under a storm surge warning, check for evacuation orders from your local officials.
Hurricane Warning: Hurricane conditions (sustained winds of 74 mph or greater) are expected somewhere within the specified area. NHC issues a hurricane warning 36 hours in advance of tropical storm-force winds to give you time to complete your preparations. All preparations should be complete. Evacuate immediately if so ordered.
Tropical Storm Warning: Tropical storm conditions (sustained winds of 39 to 73 mph) are expected within your area within 36 hours.
Extreme Wind Warning: Extreme sustained winds of a major hurricane (115 mph or greater), usually associated with the eyewall, are expected to begin within an hour. Take immediate shelter in the interior portion of a well-built structure.

Please note that hurricane and tropical storm watches and warnings for winds on land as well as storm surge watches and warnings can be issued for storms that the NWS believes will become tropical cyclones but have not yet attained all of the characteristics of a tropical cyclone (i.e., a closed low-level circulation, sustained thunderstorm activity, etc.). In these cases, the forecast conditions on land warrant alerting the public. These storms are referred to as “potential tropical cyclones” by the NWS. Hurricane, tropical storm, and storm surge watches and warnings can also be issued for storms that have lost some or all of their tropical cyclone characteristics, but continue to produce dangerous conditions. These storms are called “post-tropical cyclones” by the NWS. Watches: Listen closely to instructions from local officials on TV, radio, cell phones or other computers for instructions from local officials. Evacuate if told to do so.

Storm Surge Watch: Storm here is a possibility of life-threatening inundation from rising water moving inland from the shoreline somewhere within the specified area, generally within 48 hours. If you are under a storm surge watch, check for evacuation orders from your local officials.
Hurricane Watch: Huriricane conditions (sustained winds of 74 mph or greater) are possible within your area. Because it may not be safe to prepare for a hurricane once winds reach tropical storm force, The NHC issues hurricane watches 48 hours before it anticipates tropical storm-force winds.
Tropical Storm Watch: Tropical storm conditions (sustained winds of 39 to 73 mph) are possible within the specified area within 48 hours.

Advisories:

Tropical Cyclone Public Advisory:The Tropical Cyclone Public Advisory contains a list of all current coastal watches and warnings associated with an ongoing or potential tropical cyclone, a post-tropical cyclone, or a subtropical cyclone. It also provides the cyclone position, maximum sustained winds, current motion, and a description of the hazards associated with the storm.
Tropical Cyclone Track Forecast Cone:This graphic shows areas under tropical storm and hurricane watches and warnings, the current position of the center of the storm, and its predicted track. Forecast uncertainty is conveyed on the graphic by a “cone” (white and stippled areas) drawn such that the center of the storm will remain within the cone about 60 to 70 percent of the time. Remember, the effects of a tropical cyclone can span hundreds of miles. Areas well outside of the cone often experience hazards such as tornadoes or inland flooding from heavy rain.

Outlooks:

Tropical Weather Outlook:The Tropical Weather Outlook is a discussion of significant areas of disturbed weather and their potential for development during the next 5 days. The Outlook includes a categorical forecast of the probability of tropical cyclone formation during the first 48 hours and during the entire 5-day forecast period. You can also find graphical versions of the 2-day and 5-day Outlook here

Be sure to read up on tons of more information on Hurricane knowledge, preparedness, statistics and history under the menu on the left hand side of the page! Here are your 2020 Hurricane Season Names: Arthur, Bertha, Cristobal, Dolly, Edouard, Fay, Gonzalo, Hanna, Isaias, Josephine ,Kyle, Laura, Marco, Nana, Omar, Paulette, Rene, Sally, Teddy, Vicky and Wilfred!!!

Tracking Henri – 2021 Atlantic Hurricane Season

NHC Public Advisory on Henri

Mon, 02 Oct 2023 02:37:09 +0000: Atlantic Post-Tropical Cyclone Rina Advisory Number 15 - Atlantic Post-Tropical Cyclone Rina Advisory Number 15

000
WTNT33 KNHC 020237
TCPAT3

BULLETIN
Post-Tropical Cyclone Rina Advisory Number 15
NWS National Hurricane Center Miami FL AL182023
1100 PM AST Sun Oct 01 2023

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

SUMMARY OF 1100 PM AST...0300 UTC...INFORMATION
-----------------------------------------------
LOCATION...27.1N 55.4W
ABOUT 785 MI...1265 KM NE OF THE NORTHERN LEEWARD ISLANDS
MAXIMUM SUSTAINED WINDS...30 MPH...45 KM/H
PRESENT MOVEMENT...N OR 10 DEGREES AT 13 MPH...20 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 1100 PM AST (0300 UTC), the center of Post-Tropical Cyclone Rina
was located near latitude 27.1 North, longitude 55.4 West. The
post-tropical cyclone is moving toward the north near 13 mph (20
km/h), and this general motion is expected to continue through
Monday.

Maximum sustained winds have decreased to near 30 mph (45 km/h)
with higher gusts. The post-tropical remnant low is expected to
dissipate on Monday.

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 National Weather
Service, under AWIPS header NFDHSFAT1, WMO header FZNT01 KWBC, and
online at ocean.weather.gov/shtml/NFDHSFAT1.php

$$
Forecaster Roberts

NHC Forecast Advisory on Henri

Mon, 02 Oct 2023 02:35:40 +0000: Atlantic Post-Tropical Cyclone RINA Forecast/Advis... - Atlantic Post-Tropical Cyclone RINA Forecast/Advisory Number 15 NWS NATIONAL Hurricane CENTER MIAMI FL AL182023 0300 UTC MON OCT 02 2023 NOTICE... LAND-BASED TROPICAL Cyclone WATCHES AND WARNINGS ARE NO LONGER INCLUDED IN THE TROPICAL CYCLONE FORECAST/Advisory...(TCM). CURRENT LAND-BASED COASTAL WATCHES AND WARNINGS CAN BE FOUND IN THE MOST RECENTLY ISSUED TROPICAL CYCLONE PUBLIC ADVISORY...(TCP). POST-TROPICAL CYCLONE CENTER LOCATED NEAR 27.1N 55.4W AT 02/0300Z POSITION ACCURATE WITHIN 30 NM PRESENT MOVEMENT TOWARD THE NORTH OR 10 DEGREES AT 11 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1010 MB MAX SUSTAINED WINDS 25 KT WITH GUSTS TO 35 KT. 12 FT SEAS.. 30NE 30SE 0SW 0NW. 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 27.1N 55.4W AT 02/0300Z AT 02/0000Z CENTER WAS LOCATED NEAR 26.5N 55.5W FORECAST VALID 02/1200Z 28.9N 54.9W...POST-TROP/REMNT LOW MAX WIND 25 KT...GUSTS 35 KT. FORECAST VALID 03/0000Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 27.1N 55.4W 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 ROBERTS

000
WTNT23 KNHC 020235
TCMAT3

POST-TROPICAL CYCLONE RINA FORECAST/ADVISORY NUMBER 15
NWS NATIONAL HURRICANE CENTER MIAMI FL AL182023
0300 UTC MON OCT 02 2023

NOTICE... LAND-BASED TROPICAL CYCLONE WATCHES AND WARNINGS ARE NO
LONGER INCLUDED IN THE TROPICAL CYCLONE FORECAST/ADVISORY...(TCM).
CURRENT LAND-BASED COASTAL WATCHES AND WARNINGS CAN BE FOUND IN THE
MOST RECENTLY ISSUED TROPICAL CYCLONE PUBLIC ADVISORY...(TCP).

POST-TROPICAL CYCLONE CENTER LOCATED NEAR 27.1N 55.4W AT 02/0300Z
POSITION ACCURATE WITHIN 30 NM

PRESENT MOVEMENT TOWARD THE NORTH OR 10 DEGREES AT 11 KT

ESTIMATED MINIMUM CENTRAL PRESSURE 1010 MB
MAX SUSTAINED WINDS 25 KT WITH GUSTS TO 35 KT.
12 FT SEAS.. 30NE 30SE 0SW 0NW.
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 27.1N 55.4W AT 02/0300Z
AT 02/0000Z CENTER WAS LOCATED NEAR 26.5N 55.5W

FORECAST VALID 02/1200Z 28.9N 54.9W...POST-TROP/REMNT LOW
MAX WIND 25 KT...GUSTS 35 KT.

FORECAST VALID 03/0000Z...DISSIPATED

REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 27.1N 55.4W

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 ROBERTS

NHC Discussion on Henri

Mon, 02 Oct 2023 02:41:11 +0000: Atlantic Post-Tropical Cyclone Rina Discussion Number 15 - Atlantic Post-Tropical Cyclone Rina Discussion Number 15

000
WTNT43 KNHC 020241
TCDAT3

Post-Tropical Cyclone Rina Discussion Number 15
NWS National Hurricane Center Miami FL AL182023
1100 PM AST Sun Oct 01 2023

The depression's surface circulation has become increasingly diffuse
this evening while the cyclone has been devoid of organized deep
convection for over 18 hours. Only a few small intermittent bursts
of convection have been present just to the east and south of the
center during the past couple of hours. Therefore, this is the final
advisory on Rina, and the system is now considered to be a
post-tropical remnant low and is likely to open up into a surface
trough on Monday.

The initial motion of the low-level cloud swirl is moving
northward, or 010/11 kt, and this general motion should continue
until the remnants of Rina completely dissipate over the central
subtropical Atlantic.

FORECAST POSITIONS AND MAX WINDS

INIT 02/0300Z 27.1N 55.4W 25 KT 30 MPH...POST-TROP/REMNT LOW
12H 02/1200Z 28.9N 54.9W 25 KT 30 MPH...POST-TROP/REMNT LOW
24H 03/0000Z...DISSIPATED

$$
Forecaster Roberts

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