ATL: HARVEY - Post-Tropical - Discussion

[Chris_in_Tampa]

Something is wrong with the recon data lol

Aircraft static air pressure is missing and the extrapolated surface pressure column is gone. My system is not designed to allow for the aircraft static air pressure to be missing and coded like "////". NHOP (http://www.ofcm.gov/publications/nhop/nhop2.htm) doesn't specify that. I'll try to make some adjustments.

URNT15 KWBC 241756
NOAA2 1309A HARVEY HDOB 20 20170824
[deleted for clarity]
175500 2255N 09249W 7892 02116 0058 +171 +107 220020 020 012 001 00
175530 2255N 09247W //// 02109 +168 +107 221020 021 012 002 23
175600 2253N 09246W //// 02117 +168 +106 222019 019 015 001 20

0058 is the column for extrapolated surface pressure (or d-value). Missing in later obs. And where you see "////" that should never be coded as missing.

I have added the messages manually after I made a manual adjustment to my recon system. The system will not handle it in real time yet. I have to add the missing column in manually. I think I might temporarily have the system add that column if missing. Until then, I have to manually add each HDOB that is not correct.

[Cunxi Huang]

holy cow...873 mb, only 1 mb higher than Patricia? I would love to see one 870's anywhere in Atlantic but not here where close to land.

[WeatherCat]

Sharing disturbing new update from Jeff Lindner ... don't understand "not including Galveston Bay" and it's probably a typo since the Bay is west of High Island:


Special Advisory: 100pm Update (cat 3...125mph expected)

Harvey continues into rapid intensification…pressure down to 979mb and winds sustained to 85mph.

100pm forecast now brings strong cat 3 (125mph sustained) into the middle TX coast…cat 4 is possible.

This is a life threatening hurricane and rainfall situation.

Preparations to protect life and property MUST be rushed to completion.

Numerous evacuation orders are now in effect….follow orders immediately….persons in the hurricane warning area need to heed recommendations by local officials.

***Storm Surge warning extended to High Island…not including Galveston Bay***

New Evacuation Orders:

West end Galveston Island (voluntary evacuation order in place)

Mandatory Evac: City of Portland

Will get new impacts out after the 400pm NHC advisory package…biggest change at 100pm:

Raise storm surge values from Sargent to Jamaica Beach: 5-8 ft

Storm Surge Inundation link:

http://www.nhc.noaa.gov/refresh/graphic ... n#contents

[Aric Dunn]

Something is wrong with the recon data lol

Aircraft static air pressure is missing and the extrapolated surface pressure column is gone. My system is not designed to allow for the aircraft static air pressure to be missing and coded like "////". NHOP (http://www.ofcm.gov/publications/nhop/nhop2.htm) doesn't specify that. I'll try to make some adjustments.

URNT15 KWBC 241756
NOAA2 1309A HARVEY HDOB 20 20170824
[deleted for clarity]
175500 2255N 09249W 7892 02116 0058 +171 +107 220020 020 012 001 00
175530 2255N 09247W //// 02109 +168 +107 221020 021 012 002 23
175600 2253N 09246W //// 02117 +168 +106 222019 019 015 001 20

0058 is the column for extrapolated surface pressure (or d-value). Missing in later obs. And where you see "////" that should never be coded as missing.

I have added the messages manually after I made a manual adjustment to my recon system. The system will not handle it in real time yet. I have to add the missing column in manually. I think I might temporarily have the system add that column if missing. Until then, I have to manually add each HDOB that is not correct.

Thank you !

[Nederlander]

holy cow...873 mb, only 1 mb higher than Patricia? I would love to see one 870's anywhere in Atlantic but not here where close to land.

Don't think it's got the time to get near that pressure unless it stays offshore.. that would be a drop of about 3mb per hour up until projected landfall.

[Cuda17]

Its about that time. Looks like an eye is about to clear out shortly.


Also its unlikely that was dry air intrusion.

I agree, looks more like shadows from the towers on the North eye wall.

[lrak]

Volunteer evacuation for CC TX and Mandatory for Port Aransas.

[NDG]

GOM big picture, Harvey and 92L's circulation off of the coast of Ft Myers, if it was not for the big outflow from Harvey we would had been seen to named systems in the GOM.

[GCANE]

Its about that time. Looks like an eye is about to clear out shortly.


Also its unlikely that was dry air intrusion.

I agree, looks more like shadows from the towers on the North eye wall.

Yup, very likely.

[cycloneye]

@GregPostel
There's apparently a lot of lightning in the eyewall convection, roughly 250 miles SE of Brownsville, TX #hurricane #Harvey #txwx #lawx.




 https://twitter.com/GregPostel/status/900797479570092033

[GCANE]

I don't think I have seen a tower spin around and build so fast before.
Truly remarkable.

[Javlin]

Best pic I have seen of 92L in days.If the last VDM is a location of the center it appears a to still be NNW-N if that's the case.it appears to my eyes the UUL is directly to it's W in Mexico.
http://www.atmos.washington.edu/~ovens/ ... nhanced+24

[KWT]

Lots of lightning is very suggestive of a rapidly strengthening eyewall, very efficient at bringing down some very high winds down to the surface.

[AxaltaRacing24]

This looks like it is going to explode into a monster.

[SunnyThoughts]

When is the next AF hurricane hunter mission scheduled to head out?

[Aric Dunn]

GOM big picture, Harvey and 92L's circulation off of the coast of Ft Myers, if it was not for the big outflow from Harvey we would had been seen to named systems in the GOM.

However its that said outflow that will give life to our next system.

[AubreyStorm]

NOAA hurricane hunter radar scan courtesy of @TropicalATL shows well-defined, nearly closed eyewall of #Harvey at 1:30pm CDT.

[Kazmit]

And to think this was a disorganized tropical depression less than 24 hours ago...

[Aric Dunn]

NOAA hurricane hunter radar scan courtesy of @TropicalATL shows well-defined, nearly closed eyewall of #Harvey at 1:30pm CDT.

The rate of inner core orginization is pretty amazing. I still we have a major by 11pm.

Also that image was before its current state of convection all the wat around. Next pass will be closed

[AdamFirst]

I understand this is several days out but what, if any, effects will reach Pensacola, FL? Wondering how prepared we should be.
Thank you all.

Way too early to say. May lift north well before Pensacola. Keep an eye on the forecasts.