Hurricane Katrina

[LAwxrgal]

Am I mistaken or is that New Orleans proper?

BTW great maps MTM.

[rockyman]

18z NOGAPS shifts back east and is now directly over NOLA:

https://www.fnmoc.navy.mil/mywxmap/chart.do?username=guest&lat=40.223186&width=800&chartTypeId=chart11&height=600&watch=1125165600000&requestId=1124992704992.1386.5&lon=-109.943695&projection=Mercator&name=NOGAPS%3AGlobal_1_Degree&span=9465245.0&tau=2880

with possibly a second landfall over Bay St Louis...it's hard to tell at this resolution.

https://www.fnmoc.navy.mil/mywxmap/chart.do?username=guest&lat=40.223186&width=800&chartTypeId=chart11&height=600&watch=1125165600000&requestId=1124992704992.1386.6&lon=-109.943695&projection=Mercator&name=NOGAPS%3AGlobal_1_Degree&span=9465245.0&tau=3240

[StormsAhead]

I only got 56kts in the SW, but they're headed to the NW now.

Recon planes can only make left turns...never right...so they would either be heading into the center now (most likely) or to the SE quad.

[WindRunner]

SXXX50 KNHC 272057
AF306 WX12A KATRINA01 HDOB 33 KNHC
2047 2428N 08532W 03651 5199 291 052 132 056 053 03498 0000000000
2047. 2426N 08532W 03649 5188 286 054 122 054 055 03507 0000000000
2048 2425N 08529W 03674 5184 276 053 120 050 053 03536 0000000000
2048. 2426N 08527W 03695 5189 267 055 120 046 056 03552 0000000000
2049 2426N 08524W 03655 5194 256 056 126 050 056 03507 0000000000
2049. 2426N 08522W 03667 5196 248 059 122 064 060 03517 0000000000
2050 2427N 08519W 03672 5191 240 060 114 070 060 03527 0000000000
2050. 2428N 08517W 03659 5184 230 058 110 078 059 03521 0000000000
2051 2430N 08518W 03370 5228 223 058 130 084 058 03187 0000000000
2051. 2431N 08520W 03155 5273 225 057 146 114 058 02926 0000000000
2052 2433N 08521W 03069 5305 222 056 152 132 056 02808 0000000000
2052. 2434N 08522W 03052 5326 231 049 150 150 052 02770 0000000000
2053 2435N 08524W 03046 5344 229 038 134 134 041 02746 0000000000
2053. 2436N 08525W 03048 5356 231 025 142 142 031 02736 0000000000
2054 2438N 08527W 03051 5362 215 010 146 146 015 02733 0000000000
2054. 2439N 08528W 03047 5361 032 005 154 148 009 02730 0000000000
2055 2440N 08530W 03045 5358 044 019 156 140 024 02731 0000000000
2055. 2441N 08530W 03055 5354 057 029 148 148 032 02745 0000000000
2056 2443N 08529W 03048 5353 071 036 150 138 039 02739 0000000000
2056. 2444N 08529W 03046 5349 079 042 156 136 044 02741 0000000000

A couple of 60kt readings due west. Almost back around top . . .

[WindRunner]

I only got 56kts in the SW, but they're headed to the NW now.

Recon planes can only make left turns...never right...so they would either be heading into the center now (most likely) or to the SE quad.

I had never heard that. Interesting. Well then, almost back in the center!

[StormsAhead]

I only got 56kts in the SW, but they're headed to the NW now.

Recon planes can only make left turns...never right...so they would either be heading into the center now (most likely) or to the SE quad.

I had never heard that. Interesting. Well then, almost back in the center!

If they made right turns, they would be moving into the wind--planes can't handle it. But actually, notice where the wind dies down and changes direction around 2054...that's the eye. Amazing how much north it has moved.

[WindRunner]

I only got 56kts in the SW, but they're headed to the NW now.

Recon planes can only make left turns...never right...so they would either be heading into the center now (most likely) or to the SE quad.

I had never heard that. Interesting. Well then, almost back in the center!

If they made right turns, they would be moving into the wind--planes can't handle it. But actually, notice where the wind dies down and changes direction around 2054...that's the eye. Amazing how much north it has moved.

I'd forgotten to check for the low readings, so which is the pressure on that line? I haven't done this in a while.

[StormsAhead]

The second-to-last column is the heights...in this case, the 700mb heights. The lower the height of 700mb, the lower the pressure at the surface (and everywhere through the atmosphere). Comparing these values could give you an approximation of the pressure, but you really need a dropsonde to give it an exact number.

[WindRunner]

OK, thanks.

Coming back out through the first wall shows 78kts, but it's decaying:

SXXX50 KNHC 272107
AF306 WX12A KATRINA01 HDOB 34 KNHC
2057 2445N 08528W 03051 5343 088 049 152 138 052 02752 0000000000
2057. 2446N 08527W 03046 5333 093 057 150 144 060 02757 0000000000
2058 2448N 08526W 03049 5320 094 065 150 146 069 02773 0000000000
2058. 2449N 08525W 03046 5310 094 071 154 138 072 02780 0000000000
2059 2450N 08524W 03049 5293 099 075 150 124 076 02800 0000000000
2059. 2451N 08523W 03053 5276 101 078 152 108 078 02821 0000000000
2100 2451N 08521W 03048 5267 107 076 160 088 077 02826 0000000000
2100. 2452N 08520W 03046 5253 111 075 160 090 075 02836 0000000000
2101 2450N 08520W 03050 5265 116 073 150 124 074 02829 0000000000
2101. 2449N 08521W 03046 5291 127 071 154 150 072 02799 0000000000
2102 2447N 08522W 03049 5311 129 069 160 144 070 02782 0000000000
2102. 2446N 08522W 03051 5325 137 063 146 146 065 02770 0000000000
2103 2445N 08521W 03045 5332 149 060 138 138 061 02757 0000000000
2103. 2443N 08521W 03047 5332 163 057 146 146 057 02760 0000000000
2104 2442N 08521W 03048 5332 168 054 130 130 055 02760 0000000000
2104. 2441N 08521W 03050 5331 179 061 124 124 067 02764 0000000000
2105 2440N 08521W 03044 5333 185 068 128 128 070 02755 0000000000
2105. 2438N 08521W 03052 5332 198 062 142 142 067 02764 0000000000
2106 2437N 08522W 03043 5324 204 064 136 136 066 02763 0000000000
2106. 2436N 08522W 03050 5317 210 065 128 128 066 02776 0000000000

[StormsAhead]

Here's your vortex..
URNT12 KNHC 272105
VORTEX DATA MESSAGE
A. 27/20:54:10Z
B. 24 deg 38 min N
085 deg 28 min W
C. 700 mb 2646 m
D. NA kt
E. NA deg nm
F. 171 deg 119 kt
G. 103 deg 030 nm
H. EXTRAP 949 mb
I. 12 C/ 2416 m
J. 15 C/ 3052 m
K. 15 C/ NA
L. RAGGED
M. C40
N. 12345/ 7
O. 0.02 / 2 nm
P. AF306 WX12A KATRINA01 OB 10
MAX FL WIND 119 KT E QUAD 19:13:10 Z
SLP EXTRAP FROM 700 MB

They estimated, or extrapolated, the 700mb heights (Item C) to get an approximation of the sea-level pressure. This is not as exact as a dropsonde measurement, however.

Looks like the inner eyewall is gone...and the outer eyewall is getting tighter.

[StormsAhead]

URNT40 KWBC 272100
NOAA3 1312A KATRINA
205030 2652 08315 17227 +0800 135045 -006 -027 133046 026 003
205100 2654 08313 17225 +0801 132041 -007 -028 131042 025 003
205130 2656 08312 17223 +0807 132038 -010 -026 133039 024 003
205200 2658 08310 17214 +0809 135040 -009 -028 135041 022 002
205230 2700 08309 16876 +0787 131036 -005 -023 134037 022 002
205300 2702 08307 16375 +0746 126037 +002 -013 125038 022 002
205330 2704 08306 15870 +0708 127034 +008 +008 126034 021 002
205400 2706 08304 15190 +0674 129033 +017 +017 128034 021 003
205430 2707 08303 14399 +0633 133033 +030 +029 133033 024 002
205500 2709 08301 13726 +0594 138033 +040 +037 139033 022 002
205530 2711 08300 13103 +0556 140034 +051 +044 143034 019 002
205600 2713 08258 12455 +0518 137036 +063 +045 136037 016 002
205630 2715 08257 11791 +0475 135038 +075 +030 138039 015 003
205700 2717 08256 10953 +0418 130035 +090 +054 129036 018 003
205730 2720 08256 9980 +0366 135033 +105 +078 133034 018 002
205800 2722 08256 9126 +0316 139031 +120 +097 136033 018 002
205830 2724 08255 8133 +0257 140039 +135 +114 141041 017 003
205900 2726 08254 7405 +0213 137036 +149 +110 136037 023 004
205930 2727 08252 6769 +0149 138037 +154 +130 138038 025 004
210000 2729 08251 5783 +0100 136032 +173 +146 138033 026 004

Still moving farther away in the NE quad...

[WindRunner]

Oh shoot, I forgot to get the vortex! Thanks.

Now is it the AF or NOAA who is supposed to be on site until 5:30?

[StormsAhead]

Oh shoot, I forgot to get the vortex! Thanks.

Now is it the AF or NOAA who is supposed to be on site until 5:30?

Most likely NOAA, they were out there first.

[WindRunner]

SXXX50 KNHC 272117
AF306 WX12A KATRINA01 HDOB 35 KNHC
2107 2435N 08522W 03044 5311 214 065 128 128 066 02777 0000000000
2107. 2433N 08523W 03052 5306 218 065 154 144 066 02790 0000000000
2108 2432N 08524W 03047 5306 225 063 152 144 065 02786 0000000000
2108. 2432N 08525W 03049 5304 232 058 128 128 059 02789 0000000000
2109 2431N 08526W 03049 5303 243 055 140 140 056 02790 0000000000
2109. 2431N 08528W 03048 5305 255 054 154 148 055 02787 0000000000
2110 2430N 08529W 03046 5302 268 055 162 152 055 02788 0000000000
2110. 2430N 08530W 03049 5296 275 052 154 154 053 02798 0000000000
2111 2429N 08532W 03048 5287 287 056 146 146 057 02805 0000000000
2111. 2429N 08533W 03050 5276 296 055 144 144 055 02819 0000000000
2112 2428N 08535W 03046 5267 309 053 120 120 054 02824 0000000000
2112. 2428N 08536W 03046 5259 313 053 110 110 054 02831 0000000000
2113 2428N 08538W 03051 5250 322 058 104 104 059 02846 0000000000
2113. 2428N 08540W 03049 5236 325 059 118 118 061 02858 0000000000
2114 2427N 08541W 03045 5225 328 060 136 120 061 02865 0000000000
2114. 2427N 08543W 03049 5213 329 060 140 116 060 02880 0000000000
2115 2427N 08545W 03050 5202 327 058 140 114 059 02892 0000000000
2115. 2426N 08546W 03046 5196 326 062 136 118 062 02895 0000000000
2116 2427N 08548W 03048 5190 326 064 104 104 065 02903 0000000000
2116. 2427N 08549W 03049 5186 329 066 112 112 067 02907 0000000000

Further out, lull between the two walls, headed NW

[WindRunner]

SXXX50 KNHC 272127
AF306 WX12A KATRINA01 HDOB 36 KNHC
2117 2428N 08550W 03047 5189 328 066 108 108 066 02903 0000000000
2117. 2429N 08550W 03049 5190 333 067 104 104 068 02904 0000000000
2118 2431N 08551W 03049 5191 334 072 106 106 073 02903 0000000000
2118. 2431N 08552W 03052 5192 335 075 102 102 078 02905 0000000000
2119 2432N 08552W 03041 5191 345 081 100 100 082 02894 0000000000
2119. 2433N 08553W 03059 5183 347 078 102 102 079 02920 0000000000
2120 2434N 08552W 03105 5189 347 077 126 126 080 02961 0000000000
2120. 2435N 08550W 03069 5203 343 070 134 122 070 02911 0000000000
2121 2436N 08548W 03046 5218 343 068 136 122 070 02873 0000000000
2121. 2436N 08546W 03049 5234 339 063 142 108 065 02860 0000000000
2122 2436N 08545W 03047 5250 336 058 152 102 060 02842 0000000000
2122. 2437N 08543W 03048 5265 339 055 152 114 055 02827 0000000000
2123 2438N 08541W 03045 5287 338 057 140 114 058 02802 0000000000
2123. 2438N 08539W 03051 5313 334 062 134 130 063 02783 0000000000
2124 2439N 08537W 03046 5343 321 054 128 128 060 02747 0000000000
2124. 2440N 08536W 03053 5363 327 033 132 132 036 02734 0000000000
2125 2441N 08534W 03043 5376 358 007 134 134 016 02711 0000000000
2125. 2442N 08532W 03046 5374 125 006 148 148 009 02716 0000000000
2126 2442N 08531W 03048 5371 142 016 160 146 021 02722 0000000000
2126. 2443N 08529W 03047 5365 146 027 162 144 029 02727 0000000000

Looks like another time through a wall, and then down to 9kts? Maybe this is the inner, decaying wall.

[StormsAhead]

NOAA plane is going back to Tampa...

The AF plane went through the eye again...coordinates almost exactly the same as in the vortex. Also note how far it is between the peak wind in the eyewall and the center of the eye...shows what a large eye it is.

[StormsAhead]

SXXX50 KNHC 272134
AF300 1512A KATRINA HDOB 01 KNHC
2124 3025N 08855W 00047 5063 360 000 350 234 000 00000 0000000000
2124. 3025N 08855W 00047 5063 360 000 346 236 000 00000 0000000000
2125 3025N 08855W 00047 5063 360 000 346 234 000 00000 0000000000
2125. 3025N 08855W 00047 5063 360 000 350 234 000 00000 0000000000
2126 3025N 08855W 00047 5063 360 000 348 232 000 00000 0000000000
2126. 3025N 08855W 00047 5063 360 000 346 234 000 00000 0000000000
2127 3025N 08855W 00047 5063 360 000 346 234 000 00000 0000000000
2127. 3025N 08855W 00047 5063 360 000 346 234 000 00000 0000000000
2128 3025N 08855W 00047 5063 360 000 346 236 000 00000 0000000000
2128. 3025N 08855W 00047 5063 360 000 346 234 000 00000 0000000000
2129 3025N 08855W 00047 5063 360 000 350 234 000 00000 0000000000
2129. 3025N 08855W 00047 5062 360 000 350 234 000 00000 0000000000
2130 3025N 08855W 00047 5063 360 000 346 234 000 00000 0000000000
2130. 3025N 08855W 00047 5063 360 000 344 234 000 00000 0000000000
2131 3025N 08855W 00047 5063 360 000 338 234 000 00000 0000000000
2131. 3025N 08855W 00047 5062 360 000 336 232 000 00000 0000000000
2132 3025N 08855W 00047 5063 360 000 334 234 000 00000 0000000000
2132. 3025N 08855W 00047 5063 360 000 330 234 000 00000 0000000000
2133 3025N 08855W 00047 5063 360 000 326 234 000 00000 0000000000
2133. 3025N 08855W 00047 5063 360 000 328 232 000 00000 0000000000

And here's the next plane, this one is also AF. Probably the one Nicole Mitchell is on...they've been showing her all day on TWC.

[WindRunner]

This is AF1 (no pun intended) staarting to go through that eyewall again. 93kts.

SXXX50 KNHC 272137
AF306 WX12A KATRINA01 HDOB 37 KNHC
2127 2443N 08527W 03047 5356 150 035 166 142 039 02735 0000000000
2127. 2444N 08525W 03050 5340 150 052 166 144 058 02754 0000000000
2128 2445N 08524W 03045 5320 144 066 166 142 070 02769 0000000000
2128. 2446N 08522W 03049 5300 141 072 162 114 073 02793 0000000000
2129 2447N 08521W 03047 5284 139 070 164 102 070 02807 0000000000
2129. 2448N 08519W 03049 5267 138 071 160 092 071 02826 0000000000
2130 2449N 08518W 03049 5254 138 069 160 092 069 02840 0000000000
2130. 2450N 08516W 03049 5242 140 067 158 092 068 02852 0000000000
2131 2451N 08515W 03047 5229 142 067 152 094 068 02862 0000000000
2131. 2451N 08513W 03049 5220 144 066 148 108 068 02874 0000000000
2132 2451N 08512W 03048 5218 145 067 146 118 069 02875 0000000000
2132. 2450N 08511W 03048 5214 151 071 142 122 074 02879 0000000000
2133 2450N 08509W 03047 5206 157 078 138 118 081 02885 0000000000
2133. 2449N 08508W 03048 5198 158 082 138 122 083 02894 0000000000
2134 2449N 08506W 03047 5191 158 084 132 132 086 02901 0000000000
2134. 2449N 08505W 03048 5181 159 085 128 126 085 02911 0000000000
2135 2449N 08504W 03049 5173 163 084 110 110 085 02921 0000000000
2135. 2448N 08502W 03045 5164 166 090 100 100 092 02926 0000000000
2136 2448N 08501W 03049 5158 168 092 098 098 093 02935 0000000000
2136. 2447N 08500W 03050 5152 171 091 096 096 091 02943 0000000000

[StormsAhead]

That works. AF2...not moving very much yet.

SXXX50 KNHC 272144
AF300 1512A KATRINA HDOB 02 KNHC
2134 3025N 08855W 00047 5063 360 000 330 234 000 00000 0000000000
2134. 3025N 08855W 00047 5063 360 000 330 234 000 00000 0000000000
2135 3025N 08855W 00048 5063 360 000 334 234 000 00000 0000000000
2135. 3025N 08855W 00048 5060 360 000 334 232 000 00000 0000000000
2136 3025N 08855W 00048 5060 360 000 330 232 000 00000 0000000000
2136. 3025N 08855W 00048 5060 360 000 332 232 000 00000 0000000000
2137 3025N 08855W 00048 5060 360 000 336 236 000 00000 0000000000
2137. 3025N 08855W 00048 5060 360 000 336 234 000 00000 0000000000
2138 3025N 08855W 00048 5060 360 000 336 234 000 00000 0000000000
2138. 3025N 08855W 00048 5060 360 000 330 234 000 00000 0000000000
2139 3025N 08855W 00047 5060 360 000 330 234 000 00000 0000000000
2139. 3025N 08855W 00049 5062 360 000 328 232 000 00000 0000000000
2140 3025N 08855W 00053 5065 360 000 334 234 000 00000 0000000000
2140. 3025N 08855W 00047 5060 360 000 336 232 000 00000 0000000000
2141 3025N 08855W 00047 5060 360 000 328 232 000 00000 0000000000
2141. 3025N 08855W 00048 5060 360 000 328 232 000 00000 0000000000
2142 3024N 08855W 00048 5060 360 000 330 232 000 00000 0000000000
2142. 3024N 08856W 00048 5061 360 000 330 230 000 00000 0000000000
2143 3024N 08856W 00049 5061 360 000 330 232 000 00000 0000000000
2143. 3024N 08856W 00050 5063 360 000 334 234 000 00000 0000000000

[WindRunner]

AF1: 101kts in middle of wall, I assume.

SXXX50 KNHC 272147
AF306 WX12A KATRINA01 HDOB 38 KNHC
2137 2446N 08500W 03049 5150 173 090 098 098 091 02944 0000000000
2137. 2445N 08500W 03053 5146 176 086 100 100 087 02951 0000000000
2138 2444N 08459W 03046 5143 179 087 104 104 088 02948 0000000000
2138. 2443N 08459W 03051 5138 182 089 100 100 092 02958 0000000000
2139 2442N 08458W 03040 5130 178 097 094 094 101 02954 0000000000
2139. 2441N 08457W 03046 5129 176 088 094 094 092 02962 0000000000
2140 2440N 08457W 03054 5124 178 089 086 086 091 02975 0000000000
2140. 2439N 08456W 03046 5120 178 085 086 086 087 02970 0000000000
2141 2438N 08456W 03048 5118 182 083 088 088 086 02975 0000000000
2141. 2437N 08456W 03044 5118 183 087 088 088 088 02971 0000000000
2142 2436N 08456W 03048 5118 183 090 086 086 091 02975 0000000000
2142. 2435N 08456W 03049 5115 186 090 086 086 090 02978 0000000000
2143 2434N 08456W 03049 5112 187 093 082 082 095 02982 0000000000
2143. 2433N 08456W 03046 5111 188 094 080 080 096 02979 0000000000
2144 2432N 08456W 03050 5112 187 088 078 078 093 02982 0000000000
2144. 2431N 08456W 03047 5112 185 085 072 072 085 02980 0000000000
2145 2430N 08456W 03051 5108 190 088 074 074 091 02987 0000000000
2145. 2429N 08457W 03049 5106 193 089 078 078 090 02988 0000000000
2146 2427N 08457W 03047 5104 192 084 074 074 087 02987 0000000000
2146. 2426N 08457W 03047 5103 196 088 072 072 089 02990 0000000000