WPAC: HAIYAN - Post-Tropical

[EquusStorm]

Wondering the same about Guiuan; the city was nearly perfectly set up to get the full force of the most intense side of the storm, since they got the right-front quadrant AND they're isolated enough on the tip of the island that friction probably had no chance to slow the surface winds down there much at all from the storm's peak intensity. Surface winds probably dropped by a few mph (but I stress, not much at all, if any!) before striking Tacloban due to the eyewall being so close to land for an hour or two; that said, it looks like Tacloban was pretty much ground-zero for surge, along with winds gusting probably well over 200mph. Absolutely surreal.

[cycloneye]

JTWC 21:00 UTC warning at 65kts.

[Hurricane_Luis]

Typhoon Haiyan makes it's final Landfall, over Northern Vietnam.

[CrazyC83]

I would guess the intensity at final landfall to be 70 kt based on comparisons to earlier storms. But the pressure is likely quite low for a Cat 1.

[summersquall]

Jeff Edds' (ExtremeStorms) video:

Video interview with storm photographer Jim Edds that has just returned from Tacloban, Philippines.

http://stormvisuals.com/florida-weather/2013/11/10/video-storm-photographer-shares-experience-with-deadly-typho.html

[gatorcane]

wow looking at the videos of the devastation, I agree that it looks truly "worse than hell" there as CNN quotes on their front page this afternoon. The images coming out of Tacloban are horrific and feel so bad for those people and all the lives that were lost.

[cycloneye]

Latest ACE for WPAC is 267.762 and Haiyan has got 36.6175.

[Alyono]

pressure data from Tacloban indicate that the pressure at landfall was nowhere near as low as was Tip. May not have been sub 900.

However, lets remeber that low latitude storms have higher pressures for extreme winds. See the Felix 160+ SFMR at 930mb

What this does say, it is high time to blow up the WPAC pressure to wind relation. For starters, the data used to derive that relation is so highly suspect as I believe it is based upon ESTIMATES from recon and not mesured winds. This and Megi have showed that the extreme wind speeds often occur with pressures similar to those found in Atlantic hurricanes

[ozonepete]

pressure data from Tacloban indicate that the pressure at landfall was nowhere near as low as was Tip. May not have been sub 900.

However, lets remeber that low latitude storms have higher pressures for extreme winds. See the Felix 160+ SFMR at 930mb

What this does say, it is high time to blow up the WPAC pressure to wind relation. For starters, the data used to derive that relation is so highly suspect as I believe it is based upon ESTIMATES from recon and not mesured winds. This and Megi have showed that the extreme wind speeds often occur with pressures similar to those found in Atlantic hurricanes

I agree to some extent, but, well, maybe not "blow up" the relation but it could use some tweaking. Are you talking about the one used in Dvorak estimates? Are you sure that it's based on RECON estimates?
What were the pressure readings gotten from Tacloban? I haven't seen any yet. Also, Tacloban surely had higher pressures than Guiuan. Though I'm pretty sure we'll never get any readings from Guiuan.

[CrazyC83]

pressure data from Tacloban indicate that the pressure at landfall was nowhere near as low as was Tip. May not have been sub 900.

However, lets remeber that low latitude storms have higher pressures for extreme winds. See the Felix 160+ SFMR at 930mb

What this does say, it is high time to blow up the WPAC pressure to wind relation. For starters, the data used to derive that relation is so highly suspect as I believe it is based upon ESTIMATES from recon and not mesured winds. This and Megi have showed that the extreme wind speeds often occur with pressures similar to those found in Atlantic hurricanes

Did a pressure from Tacloban in the eyewall get recorded?

[Gorky]

I agree to some extent, but, well, maybe not "blow up" the relation but it could use some tweaking. Are you talking about the one used in Dvorak estimates? Are you sure that it's based on RECON estimates?
What were the pressure readings gotten from Tacloban? I haven't seen any yet. Also, Tacloban surely had higher pressures than Guiuan. Though I'm pretty sure we'll never get any readings from Guiuan.

If we are going to get a pressure reading from anywhere, Guiuan would be most likely as that is where the local PAGASA station is (There are some pictures of the radar tower which housed their brand new Doppler radar dome before it was destroyed). Don't see any reason why barometric pressure readings won't be available as you can take those inside shelter and without power. I'm sure wind instruments there went the way of the radar dome unfortunately though...

[supercane4867]

Another possibility is that the pressure gradient of the storm was extraordinary tight which went beyond our commonsense

Since there were no actual readings at the center of landfall when eyewall came onshore any speculation right now is only a hypothesis and will never be confirmed

[cycloneye]

First news from Vietnam. Read below.

The country's national TV channel, VTV, said heavy rain and floods triggered by Haiyan had already killed six people in central provinces.

http://www.bbc.co.uk/news/world-asia-24890114

[Alyono]

pressure data from Tacloban indicate that the pressure at landfall was nowhere near as low as was Tip. May not have been sub 900.

However, lets remeber that low latitude storms have higher pressures for extreme winds. See the Felix 160+ SFMR at 930mb

What this does say, it is high time to blow up the WPAC pressure to wind relation. For starters, the data used to derive that relation is so highly suspect as I believe it is based upon ESTIMATES from recon and not mesured winds. This and Megi have showed that the extreme wind speeds often occur with pressures similar to those found in Atlantic hurricanes

Did a pressure from Tacloban in the eyewall get recorded?

I've been hearing 960mb

[ozonepete]

pressure data from Tacloban indicate that the pressure at landfall was nowhere near as low as was Tip. May not have been sub 900.

However, lets remeber that low latitude storms have higher pressures for extreme winds. See the Felix 160+ SFMR at 930mb

What this does say, it is high time to blow up the WPAC pressure to wind relation. For starters, the data used to derive that relation is so highly suspect as I believe it is based upon ESTIMATES from recon and not mesured winds. This and Megi have showed that the extreme wind speeds often occur with pressures similar to those found in Atlantic hurricanes

Did a pressure from Tacloban in the eyewall get recorded?

I've been hearing 960mb

From where? That's way too high. I thought you were going to say 930 or so, not 960. There's no way it was that high.

[ozonepete]

I agree to some extent, but, well, maybe not "blow up" the relation but it could use some tweaking. Are you talking about the one used in Dvorak estimates? Are you sure that it's based on RECON estimates?
What were the pressure readings gotten from Tacloban? I haven't seen any yet. Also, Tacloban surely had higher pressures than Guiuan. Though I'm pretty sure we'll never get any readings from Guiuan.

If we are going to get a pressure reading from anywhere, Guiuan would be most likely as that is where the local PAGASA station is (There are some pictures of the radar tower which housed their brand new Doppler radar dome before it was destroyed). Don't see any reason why barometric pressure readings won't be available as you can take those inside shelter and without power. I'm sure wind instruments there went the way of the radar dome unfortunately though...

And it's also possible the barometers were compromised with rainwater or incredibly humid air forced into them. But you are right that there's a fairly good chance.

[CrazyC83]

From where? That's way too high. I thought you were going to say 930 or so, not 960. There's no way it was that high.

I know it was 955 before the eyewall came through (about 2 hours before landfall) in Tacloban, dropping about 15-20 an hour. It stopped functioning (likely destroyed) about 1 hour before landfall. Extrapolating that rate to landfall would be about 920 or so in Tacloban, and likely quite a bit lower to the south. I could try to do the Schloemer equation to get an estimate...

[phwxenthusiast]

Did a pressure from Tacloban in the eyewall get recorded?

I've been hearing 960mb

From where? That's way too high. I thought you were going to say 930 or so, not 960. There's no way it was that high.

960mb was the one recorded by Josh Morgerman who was in Tacloban.. granted the eye didn't actually pass directly overhead but if 960 is true then Haiyan may have never been below 900 when it was making landfall in Leyte.. It may have, however, been lost some intensity after the eyewall passed Guiuan... i just hope the PAGASA personnel in Guiuan salvaged important and relevant weather data as the eye passed through..

[weatherSnoop]

I don't think I have ever seen devastation like that. I don't think even Katrina had such horrific scenes.

Waveland Ms did... I have friends, and family that lost everything. The whole area wiped clean. Not the highlight for the news media...the aftermath flooding in NO took the lime light

[Alyono]

From where? That's way too high. I thought you were going to say 930 or so, not 960. There's no way it was that high.

apparently, that is being reported on another forum that josh morgerman's chase crew recorded. Also, the obs from Tecloman reported here as the "eyewall" was over the city were about 955mb at the lowest.

Given how fast this was moving, it is very possible we had 200 mph winds, yet the lowest pressure was about 915-920mb