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Hurricane Arthur


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Generally speaking, you can use a logarithmic equation to determine wind speed between 0-10m. Vertical wind shear at that height varies drastically depending on land cover at that height.

A forest will have a shear coefficient (alpha) of 0.6

Farmland will have a shear coefficient of (alpha) of 0.3

Water has an alpha of 0.15.

The equation to determine wind speed from one height to another is

XmWS=10mWS* (x/10)^alpha

X is the height you want to determine.

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Generally speaking, you can use a logarithmic equation to determine wind speed between 0-10m. Vertical wind shear at that height varies drastically depending on land cover at that height.

A forest will have a shear coefficient (alpha) of 0.6

Farmland will have a shear coefficient of (alpha) of 0.3

Water has an alpha of 0.15.

The equation to determine wind speed from one height to another is

XmWS=10mWS* (x/10)^alpha

X is the height you want to determine.

What is the shear coefficient of an open body of water?

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I too am absolutely loving all the radar data being gathered from Arthur. I already have a ton of frames saved from various radar sites the past few days and still collecting more. The Dual-Pol stuff is particularly interesting, as I believe that this is the first time a notable hurricane has been sampled since its implementation. This is going to leave a fantastic data set for small droplet tropical rains and just make radar data that much more accurate.

Sent from my iPhone using Tapatalk

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000

WTNT61 KNHC 040328

TCUAT1

HURRICANE ARTHUR TROPICAL CYCLONE UPDATE

NWS NATIONAL HURRICANE CENTER MIAMI FL AL012014

1130 PM EDT THU JUL 03 2014

...CENTER OF ARTHUR MAKES LANDFALL...

THE CENTER OF ARTHUR MADE LANDFALL AT ABOUT 1115 PM EDT...0315

UTC...OVER THE SHACKLEFORD BANKS BETWEEN CAPE LOOKOUT AND BEAUFORT

NORTH CAROLINA. THE NOAA AUTOMATED STATION AT CAPE LOOKOUT RECENTLY

REPORTED SUSTAINED WINDS OF 77 MPH...124 KM/H...AND A WIND GUST OF

101 MPH...163 KM/H.

SUMMARY OF 1130 PM EDT...0330 UTC...INFORMATION

--------------------------------------------------

LOCATION...34.7N 76.6W

ABOUT 5 MI...10 KM NW OF CAPE LOOKOUT NORTH CAROLINA

ABOUT 65 MI...105 KM WSW OF CAPE HATTERAS NORTH CAROLINA

MAXIMUM SUSTAINED WINDS...100 MPH...155 KM/H

PRESENT MOVEMENT...NE OR 35 DEGREES AT 18 MPH...30 KM/H

MINIMUM CENTRAL PRESSURE...976 MB...28.82 INCHES

$

FORECASTER BEVEN/BLAKE

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Cape Lookout: peak sustained wind of ESE 67 kt (10-minute average); peak gust of 88 kt. Both during the past hour.

http://www.ndbc.noaa.gov/station_page.php?station=clkn7

Very, very impressive, especially for a station that is technically land-based.

Definitely... The obs from the outer banks could even more impressive given they are going to be squarely in the eastern eyewall.

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By looping KMHX, it looks like frictional convergence is doing its dirty deed for Arthur, helping to tighten the core as it crosses Carteret County.  Seeing reports on Twitter that the back end is stronger than the front and I can't help but wonder if Arthur as a whole is continuing to slowly strengthen right now.

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