Tropical Update: 23 Feb

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Tropical Update: 23 Feb

#1 Postby senorpepr » Mon Feb 23, 2004 6:55 am

:rarrow: A) CYC Noname (13P): At 23/0900Z...
Position near 14.8S 171.7E (280nm NE of Port Vila, Vanuatu)
Movement toward the W at 7 mph
Maximum sustained winds are 50 mph
Minimum central pressure is 991 mb
T# numbers: 3.0/3.0

13P is continuing to strengthen at a climatological rate under favorable environmental conditions. Expect westward progression until the ridge starts to break down. This will allow 13P to move in more of a southwesterly direction. Expect 13P to reach 75 mph by the 24 hour point while ending the forecast period at 48 hours as an 85 mph cyclone.

It is interesting to note that the Fiji Meteorological Service has given 13P the name “Ivy”. Fiji has “Ivy” at a lower current intensity (40 mph) with a lower forecast speed. (48 hours = 65 mph) Regardless, we’ll still with consistency and stand by the USN products. I expect the JTWC to give 13P her name by the afternoon advisory at 4pm EST (21Z).

https://metoc.npmoc.navy.mil/jtwc/warni ... 304web.txt
http://www.met.gov.fj/advisories.html

Please utilize the above link for the latest advisory. For latest forecast tracks and satellite imagery, go to the NRL Monterey's website at: http://www.nrlmry.navy.mil/tc_pages/tc_home.html
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#2 Postby senorpepr » Mon Feb 23, 2004 8:50 am

The 23/1125Z data from the satellite agencies report 14.8S 170.6E T3.5/3.5. Furthermore, they've upgraded 13P to Ivy. We're still waiting to see when JTWC and NRL upgrades...
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#3 Postby senorpepr » Mon Feb 23, 2004 10:52 am

Update... At 23/1430Z...
Position near 14.0S 170.9E
Maximum sustained winds are 65 mph
Minimum central pressure is 984 mb
T# numbers: 3.5/3.5
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#4 Postby senorpepr » Mon Feb 23, 2004 12:02 pm

NRL now has Ivy up. JTWC will probably follow suit on the 21Z advisory.
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#5 Postby senorpepr » Mon Feb 23, 2004 1:20 pm

Looks as if an eye may be forming... unless my eyes aren't working right.

Image
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#6 Postby senorpepr » Mon Feb 23, 2004 2:40 pm

Now it looks like that feature has fizzled... new advisory comes out in a little over an hour...
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The Reason

#7 Postby Aslkahuna » Mon Feb 23, 2004 3:01 pm

why Fiji has lower winds on their advisory is that they (like most of the rest of the World) use the WMO standard for sustained winds which is a 10 minute average vs the US 1 minute average. Additionally, most other countries use 100 km/hr as the point at which a TC becomes hurricane force. Since 10 minute winds are on average 20% lower than 1 minute winds, 100 km/hr 10 minute will equal 74.4 mph for a 1 minute wind.

Steve
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#8 Postby senorpepr » Mon Feb 23, 2004 3:09 pm

Ahh... yes! I forgot all about the WMO vs US wind differences. It had completely slipped my mind. I remember back when I was stationed in Germany we had to deal with that all the time -- the US bases reporting 1 min averages vs the local bases reporting 10 min averages. Isn't there also a height difference such as WMO winds being reported at 10m off the ground?
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#9 Postby ColdFront77 » Mon Feb 23, 2004 4:49 pm

Interesting. I am not too surprised, but there must be a reason why there is the 1 minute versus 10 minute average wind speed between the U.S. and the WMO...
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#10 Postby senorpepr » Mon Feb 23, 2004 4:50 pm

UPDATE!

:rarrow: A) TC Ivy (13P): At 23/2100Z...
Position near 13.7S 170.2E (270nm NNE of Port Vila, Vanuatu)
Movement toward the WNW at 8 mph
Maximum sustained winds are 80 mph
Minimum central pressure is 972 mb
T# numbers: 4.0/4.0

Ivy is now posed to begin the southwestward progression as the mid-level ridge weakens. Expect faster-than-normal intensification with SSTS in the mid to upper 80s°F. Ivy is forecast to reach 145 mph at the 48 hour point of the forecast, with additional intensification afterward.

https://metoc.npmoc.navy.mil/jtwc/warni ... 304web.txt

Please utilize the above link for the latest advisory. For latest forecast tracks and satellite imagery, go to the NRL Monterey's website at: http://www.nrlmry.navy.mil/tc_pages/tc_home.html
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#11 Postby senorpepr » Mon Feb 23, 2004 5:16 pm

Image
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#12 Postby senorpepr » Mon Feb 23, 2004 8:53 pm

At 23/2325Z...
Position near 13.2S 169.5E
Maximum sustained winds are 90 mph
Minimum central pressure is 963 mb
T# numbers: 4.0/4.0
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#13 Postby senorpepr » Mon Feb 23, 2004 10:44 pm

T numbers up to 4.5/4.5
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