Eskimo Joe Posted July 4, 2014 Share Posted July 4, 2014 From MHX NWS chatroom: "Family member near Ft. Macon, NC says winds have dropped off dramatically over the past 10 min...the loud roar is gone and it is getting "dead quiet" Link to comment Share on other sites More sharing options...
nflwxman Posted July 4, 2014 Share Posted July 4, 2014 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. Link to comment Share on other sites More sharing options...
Thundersnow12 Posted July 4, 2014 Share Posted July 4, 2014 The 96 and 200 frame radar loops on CoD's site of Arthur are amazing. Link to comment Share on other sites More sharing options...
Eskimo Joe Posted July 4, 2014 Share Posted July 4, 2014 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? Link to comment Share on other sites More sharing options...
1900hurricane Posted July 4, 2014 Share Posted July 4, 2014 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 Link to comment Share on other sites More sharing options...
JC-CT Posted July 4, 2014 Share Posted July 4, 2014 Landfall? Link to comment Share on other sites More sharing options...
Thunder Road Posted July 4, 2014 Share Posted July 4, 2014 Piney Island (KPNT) gusted to 58 kts with the last ob Link to comment Share on other sites More sharing options...
Superstorm93 Posted July 4, 2014 Author Share Posted July 4, 2014 Cape Lookout is down to 978 mb Link to comment Share on other sites More sharing options...
Hvward Posted July 4, 2014 Share Posted July 4, 2014 Link to comment Share on other sites More sharing options...
Rjay Posted July 4, 2014 Share Posted July 4, 2014 Ok this made landfall in Cape Lookout...looks pretty obvious. Link to comment Share on other sites More sharing options...
NorthNJwx Posted July 4, 2014 Share Posted July 4, 2014 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. Link to comment Share on other sites More sharing options...
Hvward Posted July 4, 2014 Share Posted July 4, 2014 Mesovort thats wrapping around to the eye wall developed 10 miles or less from the doppler. Should get some nice data from that. Link to comment Share on other sites More sharing options...
Disc Posted July 4, 2014 Share Posted July 4, 2014 Threw together a quick animation of the landfall. Link to comment Share on other sites More sharing options...
bdgwx Posted July 4, 2014 Share Posted July 4, 2014 Anybody know if any of the the mobile radar units were deployed? I know Dr. Wurman and his crew have done this before with tropical cyclones. Link to comment Share on other sites More sharing options...
Jim Marusak Posted July 4, 2014 Share Posted July 4, 2014 looks like the instrument cluster blew over for the most part at Morehead City (KMRH) except for the barometer and the precip tipping bucket. Link to comment Share on other sites More sharing options...
BuffaloWeather Posted July 4, 2014 Share Posted July 4, 2014 101 MPH gust at Cape Lookout according to TWC. Link to comment Share on other sites More sharing options...
Rjay Posted July 4, 2014 Share Posted July 4, 2014 Landfall 11:15 pm. Shackleford Banks, NC 100 mph Link to comment Share on other sites More sharing options...
andyhb Posted July 4, 2014 Share Posted July 4, 2014 Threw together a quick animation of the landfall. Amazing stuff. Link to comment Share on other sites More sharing options...
BuffaloWeather Posted July 4, 2014 Share Posted July 4, 2014 Where is Hurricane Josh? First Cat 2 to hit USA in 6 years and he is MIA? Last seasons insane Pacific season must have set his standards to all time highs. Link to comment Share on other sites More sharing options...
jm1220 Posted July 4, 2014 Share Posted July 4, 2014 I could only imagine the conditions down there-I remember the 90 mph gusts in Sandy and that was scary. I definitely remember the roaring and house shaking. Link to comment Share on other sites More sharing options...
Superstorm93 Posted July 4, 2014 Author Share Posted July 4, 2014 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 Link to comment Share on other sites More sharing options...
nflwxman Posted July 4, 2014 Share Posted July 4, 2014 What is the shear coefficient of an open body of water? 0.1ish Link to comment Share on other sites More sharing options...
Dunkman Posted July 4, 2014 Share Posted July 4, 2014 From the ISS: (@astro_reid) Link to comment Share on other sites More sharing options...
phil882 Posted July 4, 2014 Share Posted July 4, 2014 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. Link to comment Share on other sites More sharing options...
Eduardo Posted July 4, 2014 Share Posted July 4, 2014 Been at work all day with little time to stay on top of this! Unreal!! Any chance for additional intensification given the center's trajectory keeping it in close proximity to the water with only the barrier island beneath it? Link to comment Share on other sites More sharing options...
Jayhawkers Posted July 4, 2014 Share Posted July 4, 2014 Definitely... The obs from the outer banks could even more impressive given they are going to be squarely in the eastern eyewall. indefinitely will be better. Could see some gusts reach over well over cat-3 strength... Link to comment Share on other sites More sharing options...
tornadotony Posted July 4, 2014 Share Posted July 4, 2014 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. Link to comment Share on other sites More sharing options...
SnowGoose69 Posted July 4, 2014 Share Posted July 4, 2014 The HSE ASOS likely will fail soon but so far its recorded 59 kts Link to comment Share on other sites More sharing options...
Jackstraw Posted July 4, 2014 Share Posted July 4, 2014 Looks like HH's got a Vortex right as the center hit the beach, I've never seen that Link to comment Share on other sites More sharing options...
wxmeddler Posted July 4, 2014 Share Posted July 4, 2014 Marshall Shepard just posted this paper on Birds and Hurricane eye's. Not the first time it's happened. http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1407&context=geosciencefacpub Link to comment Share on other sites More sharing options...
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