FacebookTwitterRedditEmail

Some Dimensions of Hurricane Florence

The estimates which follow are based on rough quantitative data about Hurricane Florence, which were reported on 12 September 2018 by several news outlets.

1) Maximum sustained winds (morning, 12 September 2018):

215 km/hr = 134 mph.

2) Diameter (width) of the eye:

~40 km = ~25 miles.

3) Diameter (width) of the storm:

~660 km = ~410 miles.

4a) Area of the storm:

~238,000 km^2 = ~91,820 square miles.

4b) Area of storm calculated (by MG,Jr.) based on reported diameter:

342,000 km^2 = 132,000 square miles.

4c) Diameter of storm calculated (by MG,Jr.) based on reported area: 550.4 km = 342 miles

Other dimensional features, reported on 12 September 2018, are:

5) Largest ocean waves (which occur in the northeast quadrant of the storm): 83 feet = 25 meters.

6) Peak wind speed dropped (by afternoon 12 September 2018) to: 125 mph = 201 km/hr.

7) Size of the (inner high-speed) windfield expanded to a diameter

(the width, with eye in center) of:

140 miles = 226 km.

8) The hurricane is expected to bring a storm surge (onto the coast) upwards of 6 feet (1.8 m) in parts of the coastline, including up to 13 feet (4 m) from Cape Fear north to Cape Lookout.

9) The expected rainfall is up to 40 inches (1 m) in isolated areas in the Carolinas and anywhere between 6 to 12 inches (15 to 30 cm) elsewhere in the Appalachians and Mid-Atlantic region.

10) Expected cost of storm damages: $170 billion; which would make Hurricane Florence the most expensive hurricane to hit the continental U.S.

Using an average height of 16 km (10 miles) for hurricanes:

11) The volume of the (inner, high speed) windfield is estimated to be: ~642,000 km^3 = ~154,000 cubic miles.

Using an average diameter (width) of 600 km = ~372 miles, for Hurricane Florence:

12) The area of the storm is:

~282,700 km^2 = ~109,100 square miles.

13) The volume of the entire storm is estimated to be:

~4,524,000 cubic km = ~1,084,000 cubic miles.

Now, a more speculative calculation, of RAINFALL (by MG, Jr.):

Assuming:

a) storm area = 282,700 square kilometers = ~109,100 square miles,

b) storm height = 16 km = ~10 miles,

c) storm volume = 4,524,000 cubic km = ~1,084,000 cubic miles,

and

d) 96.5% of standard air density (which is 1.204 kg/m^3 at sea level)

in the storm volume, to account for the “low pressure” of the system, which is primarily at the center, and rising toward the edge; so an average air density of 1.162 kg/m^3 for the storm,

e) 90% relative humidity at 70 degrees Fahrenheit, everywhere (an averaging), then, the water content in the storm is: 100 grains of water (0.0143 lb) per lb of dry air.

Using liquid water density at 1 gram/cc = 1 kg/1000cc = 1000kg/m^3, the amount of water (humidity) per VOLUME (of atmospheric space in the storm) is:

0.036633 lb of water per cubic meter =

0.0166166 kg of water per cubic meter =

16,616,600 kg of water per cubic kilometer (of air space in the storm).

Thus, the total mass of liquid water in the storm (of volume 4,524,000 cubic km) is: 75,173,498,400,000 kg of liquid water (75.173… trillion kg = 75.173… thousand-billion kilograms).

The volume of liquid water ALONE (for the entire storm) is: 75.1734984 km^3 (75.173… cubic kilometers).

For the area of this storm (282,700 km^2), the depth of rainfall

(if all the water rains out over the entire storm area) is: 0.266 meters = 26.6 centimeters = 10.5 inches.

Rain over real terrain will collect into flood streams of greater depth (for lower lying areas).

Also, the rainfall near the center of the hurricane will be much higher (a 40 inch = 1 meter expectation was reported);

The rainfall closer to the edge of the storm, and everywhere late in its lifetime, will be lighter (a 6-to12 inch = 15-to-30 centimeter expectation was reported).

So, my estimate of 10-11 inches of rainfall, averaged for the entire storm area (282,700 square kilometers = ~109,100 square miles), seems reasonable.

Source (1 to 4):

https://globalnews.ca/news/4443132/how-big-is-hurricane-florence/

Source (5 to 10):

http://www.foxnews.com/us/2018/09/12/hurricane-florence-storm-lifetime-generating-83-feet-high-waves-as-it-barrels-towards-carolina-coast.html

These estimates were prompted by questions from Lynn Chadderdon.

 

More articles by:

Manuel Garcia, Jr, once a physicist, is now a lazy househusband who writes out his analyses of physical or societal problems or interactions. He can be reached at mangogarcia@att.net

bernie-the-sandernistas-cover-344x550
November 21, 2019
Patrick Cockburn
Reports of War Crimes in Iraq and Afghanistan Highlight the Failures of Both Wars
Steven Gorelick
Thinking Outside the Grid
William Hartung
America’s Arms Sales Addiction
Michael Welton
Christianity is the Religion of Imperialism
Binoy Kampmark
Letting the Side Down: Prince Andrew, the Royal Family and Jeffrey Epstein
Craig Collins
Open Letter to the People of Planet Earth
David Schultz
The Democratic Party’s Missing Electoral College Game Plan
Norman Solomon
Joe Biden’s AstroTurf Campaign
Bob Lord
Health Care and “Head Taxes”: an Unhealthy Combination
Jesse Jackson
The Right to Vote Should not Fall Victim to Partisan Battles
Ted Rall
Billionaires and Corporations Love Anti-SLAPP Laws, Why Does John Oliver?
Priti Gulati Cox
One Pound Capitalism, a Pinch of Democracy, and an Impeachment
Thomas Knapp
Voters Say They Want a Third Party, They Should Vote Accordingly
Jenna Orkin
Overtunring WI v. Yoder: Making Education a Federal Right for All Children (and Bringing the MeToo Movement to Fundamentalist Communities)
November 20, 2019
Vijay Prashad
The Coup in Bolivia Has Everything to Do With the Screen You’re Using to Read This
Kenneth Surin
Labor and the UK General Election
Ron Jacobs
The Trumpists’ Attempts at Snark Define Their Day: Impeachment Day Three
George Ochenski
The Walls are Closing in on Donald Trump
Timothy M. Gill
Towards a Democratic Socialist Foreign Policy
Robert Hunziker
Neoliberalism Backfires
Thomas S. Harrington
Let’s Give Three Cheers for Those “Western Ears” 
Michelle Renee Matisons
Freedom, Valor, Love: On Snowden’s Permanent Record
James C. Nelson
How Trump is Warping the Federal Courts: the Case Against Lawrence VanDyke
Rev. William Alberts
Whistleblowing Religion
Chandra Muzaffar
The Coup That Ousted Morales
Mike Garrity
Trump Administration Ignores Court Order Stopping 85,000 Acre Payette Forest Logging and Burning Project, Conservation Groups Sue
Andrew Moss
Raising the Stakes in the Struggle Over Immigration Detention
Dean Baker
Making Andrew Yang Smarter
Lawrence Wittner
The People of the World
November 19, 2019
Ramzy Baroud
How Western Media Bias Allows Israel to Getaway with Murder in Gaza
Patrick Cockburn
Erdogan’s Ethnic Cleansing of the Kurds is Still Happening
Dave Lindorff
Student Protesters are Walking a Tightrope in Hong Kong
Richard Greeman
French Yellow Vests Celebrate First Birthday, Converge With Planned Labor Strikes
Dean Baker
Impeachment is a Kitchen Table Issue
Walden Bello
Is China an “Imperial Power” in the Image of the West?
Jim Britell
Modern Biology and Ecology: the Roots Of America’s Assertive Illiteracy
Sabri Öncü
Non-Financial Private Debt Overhang
John Steppling
Baby Shark Coup
Binoy Kampmark
Open Guidelines: The Foreign Interference Problem in Australian Universities
Evaggelos Vallianatos
Greece and the Struggle for Freedom
Colin Todhunter
Lab Rats for Corporate Profit: Pesticide Industry’s Poisoned Platter
James Graham
Open Letter to Jeremy Corbyn on the Eve of the Debate
Elliot Sperber
Scrutiny – From Scruta
November 18, 2019
Olivia Arigho-Stiles
Protestors Massacred in Post-Coup Bolivia
Ashley Smith
The Eighteenth Brumaire of Macho Camacho: Jeffery R. Webber and Forrest Hylton on the Coup in Bolivia
FacebookTwitterRedditEmail