ATL: IRMA - Post-Tropical - Discussion

[Extratropical94]

VDMs and dropsonde information will be decoded before posting

URNT15 KWBC 032111
NOAA2 0111A IRMA HDOB 12 20170903
210130 1604N 05049W 6957 03183 0040 +118 +050 310026 027 021 000 00
210200 1606N 05047W 6984 03146 0029 +126 +047 314025 026 022 000 00
210230 1608N 05046W 6961 03175 0030 +124 +045 319024 025 022 001 00
210300 1610N 05045W 6957 03180 0035 +118 +048 320026 026 024 001 00
210330 1612N 05044W 6964 03170 0037 +115 +051 319028 028 022 001 00
210400 1613N 05043W 6961 03171 0039 +112 +051 314027 028 024 001 00
210430 1615N 05042W 6960 03171 0040 +112 +052 315029 031 023 001 00
210500 1617N 05041W 6952 03180 0031 +116 +050 320033 033 022 001 00
210530 1619N 05040W 6955 03175 0031 +114 +053 319033 034 024 001 00
210600 1620N 05039W 6939 03188 0016 +124 +046 312032 032 023 001 00
210630 1622N 05038W 6956 03171 0015 +126 +045 309033 035 025 000 00
210700 1624N 05037W 6956 03169 0018 +121 +047 313037 037 024 000 00
210730 1626N 05036W 6961 03159 0029 +110 +054 311036 036 024 000 00
210800 1627N 05035W 6969 03148 0034 +104 +057 307035 035 025 001 00
210830 1629N 05034W 6954 03168 0039 +099 +059 303034 035 026 000 00
210900 1631N 05033W 6951 03173 0038 +100 +061 305036 038 024 001 00
210930 1633N 05032W 6924 03197 0035 +098 +057 306038 040 026 000 00
211000 1634N 05031W 6912 03211 0034 +094 +058 303039 040 025 001 00
211030 1636N 05030W 6937 03178 0030 +097 +062 305041 043 026 001 00
211100 1638N 05029W 6957 03154 0023 +104 +061 312043 044 027 001 00

[Kingarabian]

[flamingosun]

Irma 's size is growing . . .
From 5 PM Advisory:

Hurricane-force winds extend outward up to 35 miles (55 km) from the
center and tropical-storm-force winds extend outward up to 140 miles
(220 km).

At 11 AM, those distances were 25 and 80 miles, respectively.

[GCANE]

Top pic, Irma's energy now.
Bottom pic, Irma's energy forecasted 120 hrs out.

[ScottNAtlanta]

I'm trying to get proactively prepared for Irma and remembered someone mentioning tension clips (plylox). Can anyone tell me where you can get them? They are harder to find than I anticipated

I got them at Home Depot (or Lowe's, can't remember, it's been awhile). You can look at ACE Hardware, too, I suspect - or Amazon...if your is as good as mine, stuff gets delivered within 2 days.

I use 8 per window (one on each corner - left and right - of each "side"), and come in packages of 20, I think, so count carefully how many you'll need to purchase.

Yup! Found 'em at Amazon - https://www.amazon.com/s/ref=nb_sb_noss ... rds=plylox

Hope I didn't break a rule here...

THANKS! I found a seller that can get them here the 7th and that should be plenty of time...hopefully wont need them, but better prepared than searching when people start panic buying

[Chris_in_Tampa]

Radar image: 5:04pm EDT
P-3 track: 5:11pm EDT

[Extratropical94]

URNT15 KWBC 032121
NOAA2 0111A IRMA HDOB 13 20170903
211130 1640N 05028W 6966 03145 0024 +103 +075 312043 044 029 001 00
211200 1642N 05027W 6952 03158 0021 +102 +079 312043 044 029 005 00
211230 1643N 05026W 6957 03152 0020 +103 +070 306042 043 029 006 00
211300 1645N 05024W 6969 03132 0011 +106 +076 303044 045 027 008 00
211330 1647N 05023W 6964 03137 0020 +096 +075 298042 044 031 003 00
211400 1649N 05022W 6948 03154 0029 +087 +080 296039 040 032 001 00
211430 1650N 05021W 6968 03127 0020 +092 +083 290041 042 033 002 00
211500 1652N 05020W 6965 03129 0010 +097 +086 293045 046 036 003 00
211530 1654N 05019W 6956 03134 0000 +099 +094 296046 047 037 005 00
211600 1656N 05018W 6957 03127 9994 +099 +095 304045 045 039 005 00
211630 1658N 05017W 6963 03116 9985 +103 +084 303045 045 039 003 00
211700 1700N 05016W 6963 03110 9980 +101 +088 302049 051 039 003 00
211730 1701N 05015W 6958 03109 9976 +098 +096 303054 055 043 004 00
211800 1703N 05014W 6938 03124 9972 +097 +093 314054 055 046 003 00
211830 1705N 05013W 6944 03113 9946 +113 +074 320058 059 047 003 00
211900 1706N 05012W 6970 03071 9942 +109 +087 316056 058 049 002 00
211930 1708N 05011W 6963 03075 9927 +112 +103 320062 067 052 004 00
212000 1710N 05010W 6954 03073 9904 +121 +088 321069 070 055 005 00
212030 1711N 05009W 6961 03051 9888 +125 +087 318073 074 056 005 00
212100 1713N 05008W 6957 03045 9875 +124 +091 319076 077 056 007 00

[Kingarabian]

Next pass will be the center. Thinking pressure will be higher than 969mb.

[Chris_in_Tampa]

Center at 5:16:49pm EDT:





Credit: NOAA-AOC

[Kingarabian]

[Alyono]

this is a tail Doppler mission to initialize the high res models. It is not a standard Alpha pattern

[Extratropical94]

As there has been a request to decode the HDOBs, I want to give a short explanation of the HDOBs and how to read them: (I thought we had a sticky thread about this somewhere on the board, but I cannot find it)

URNT15 KWBC 032111
NOAA2 0111A IRMA HDOB 12 20170903
210130 1604N 05049W 6957 03183 0040 +118 +050 310026 027 021 000 00
210200 1606N 05047W 6984 03146 0029 +126 +047 314025 026 022 000 00
210230 1608N 05046W 6961 03175 0030 +124 +045 319024 025 022 001 00
210300 1610N 05045W 6957 03180 0035 +118 +048 320026 026 024 001 00
210330 1612N 05044W 6964 03170 0037 +115 +051 319028 028 022 001 00
210400 1613N 05043W 6961 03171 0039 +112 +051 314027 028 024 001 00
210430 1615N 05042W 6960 03171 0040 +112 +052 315029 031 023 001 00
210500 1617N 05041W 6952 03180 0031 +116 +050 320033 033 022 001 00
210530 1619N 05040W 6955 03175 0031 +114 +053 319033 034 024 001 00
210600 1620N 05039W 6939 03188 0016 +124 +046 312032 032 023 001 00
210630 1622N 05038W 6956 03171 0015 +126 +045 309033 035 025 000 00
210700 1624N 05037W 6956 03169 0018 +121 +047 313037 037 024 000 00
210730 1626N 05036W 6961 03159 0029 +110 +054 311036 036 024 000 00
210800 1627N 05035W 6969 03148 0034 +104 +057 307035 035 025 001 00
210830 1629N 05034W 6954 03168 0039 +099 +059 303034 035 026 000 00
210900 1631N 05033W 6951 03173 0038 +100 +061 305036 038 024 001 00
210930 1633N 05032W 6924 03197 0035 +098 +057 306038 040 026 000 00
211000 1634N 05031W 6912 03211 0034 +094 +058 303039 040 025 001 00
211030 1636N 05030W 6937 03178 0030 +097 +062 305041 043 026 001 00
211100 1638N 05029W 6957 03154 0023 +104 +061 312043 044 027 001 00

Time of observation - 21:10:00 UTC
Aircraft position - 16°38' N 50°29'W
Aircraft static pressure - 695.7 mbars
Aircraft geopotential height - 3154 gpm
Extrapolated surface pressure - 1002.3 mbars
Temperature - +10.4°C
Dewpoint - +6.1°C
30 second wind direction and speed - 312° at 43 knots
Peak 10 second wind speed - 44 knots
Extrapolated surface wind speed (SFMR) - 27 knots
Peak 10 second rain rate - 1 mm/hr
Error flags - 00 = no error with this dataset

Each line represents one 30 second observation period.

[Extratropical94]

959 mb

URNT15 KWBC 032131
NOAA2 0111A IRMA HDOB 14 20170903
212130 1714N 05007W 6955 03034 9863 +120 +092 318080 082 061 007 00
212200 1716N 05006W 6951 03021 9836 +123 +098 318080 082 067 004 00
212230 1717N 05005W 6948 02997 9813 +119 +113 326084 086 072 004 00
212300 1719N 05004W 6952 02969 9778 +125 +115 328085 087 073 004 00
212330 1720N 05003W 6953 02937 9744 +125 //// 332086 087 077 003 01
212400 1721N 05001W 6952 02896 9690 +134 +128 335077 081 078 004 00
212430 1722N 04959W 6933 02890 9642 +144 +128 341053 061 077 005 03
212500 1723N 04957W 6938 02855 9602 +160 +116 354034 037 049 003 03
212530 1723N 04955W 6958 02820 9595 +155 +117 356020 026 031 001 03
212600 1723N 04953W 6980 02789 9596 +148 +131 014005 008 022 001 00
212630 1724N 04951W 6961 02811 9586 +160 +127 160010 015 021 002 03
212700 1726N 04949W 7000 02775 9588 +171 +116 141029 034 033 003 00
212730 1727N 04948W 6969 02827 9606 +165 +116 144042 046 038 002 00
212800 1729N 04947W 6966 02852 9641 +151 +123 141058 061 054 004 00
212830 1731N 04946W 6983 02857 9681 +139 +136 142072 077 085 023 00
212900 1733N 04945W 6957 02925 9718 +139 +136 138088 090 098 035 00
212930 1735N 04944W 6953 02968 9782 +118 //// 134086 090 098 036 01
213000 1737N 04942W 6953 02998 9836 +104 //// 128095 096 087 052 01
213030 1739N 04941W 6965 03016 9865 +110 +103 125093 095 081 039 00
213100 1740N 04940W 6967 03034 9889 +110 +097 128087 090 069 014 00

[Kingarabian]

As there has been a request to decode the HDOBs, I want to give a short explanation of the HDOBs and how to read them: (I thought we had a sticky thread about this somewhere on the board, but I cannot find it)

Good explanation. Users can also use this website to decode created by Chris_in_Tampa:

http://tropicalatlantic.com/recon/recon ... ge=decoder

[Kingarabian]

958mb Extrap on this pass.

[SouthDadeFish]

958-959 mb extrapolated surface pressure. This is quite a bit lower than the 5 pm advisory of 969 mb.

[Kingarabian]

958-959 mb extrapolated surface pressure. This is quite a bit lower than the 5 pm advisory of 969 mb.

Surprised me considering its eyewall state on radar and satellite imagery.

[Aric Dunn]

REcon showing its pretty much 115 mph. they have not sampled right front quad yet. likely some slightly higher winds.

[galaxy401]

Looks like Irma is indeed a category 3 after all.

[RL3AO]

Pressure quite a bit lower too. Probably in the 962 mb range.