Re: 36 mb drop in 24 hrs
Posted by Chris in Tampa on 9/30/2016, 2:18 pm
First, the term inbound. That means on the way into the center, that is the highest wind they saw on the way. When they make a turn and head toward the center from that point, that is the inbound leg. Outbound leg would be from the center to the end point where they make a turn and then they do the pattern where they will eventually setup for the next pass, heading inbound again to the center.

The vortex message is released after they pass the center, but before they have likely finished the outbound leg. I think that is why D through G are inbound readings. Maybe that was more important historically, but that is what those fields still represent.

The remarks section can have various things. If a higher wind reading, surface or flight level, occurs outbound, they can release the vortex message with that outbound data in the remarks section. By the time they release the vortex they likely already have that highest outbound data too, but if they put out the vortex fast, I guess they just update it. I forget all the rules, you could check NHOP ( http://www.ofcm.gov/nhop/16/nhop16.htm ) for that, but if the wind is higher outbound, I think it is included in the remarks. If it doesn't have the word inbound or outbound in the remarks, then that is the high wind. I don't know how it is officially done, but the remarks section that has the highest winds might be just for that pass. If something lower is found on the next pass, they may not have the previous pass wind. That does happen at least sometimes, but I don't know if that is a rule and it always occurs that way.

For the remarks section, just keep in mind when it says flight level wind and when it says surface or sfmr wind. Usually the remarks section has the 10 second averaged winds, regardless of whether it is flight level or surface.

In that vortex, the surface winds happened to be higher than the flight level winds of the aircraft. I should note that this research mission is at a bit of a different level than the Air Force mission. I haven't had a chance to look at the winds at various levels that you can see from sondes released in the eyewall.

Sondes:
http://hurricanecity.com/recon/recon.cgi?basin=al&year=2016&storm=Matthew&product=sonde
You can see momentary winds of up to 143mph at higher levels as the sonde dropped from the aircraft and measured wind at various levels.
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Matthew now a major hurricane; hurricane watch may be required for Jamaica later Friday - Chris in Tampa, 9/30/2016, 11:01 am
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