Forums – StormCast

SKYSUMMIT
President | Director of Operations Administrator

Posts - 61,641

Likes - 11,704

Social: - Facebook, Twitter

HURRICANE ISAAC Discussion Thread #15 Aug 28, 2012 9:43:44 GMT -6

Post by SKYSUMMIT on Aug 28, 2012 9:43:44 GMT -6

Aug 28, 2012 9:35:37 GMT -6 504canes said:

What does the pressure do for the storm. Obviously we know what the wind does but what does the pressure falling effect?

Central pressure is everything in a hurricane. Your lowest pressure will be at the center, or eye of the storm and pressures are higher around it. The lower that pressure in the center, the tighter the wind gradient around it and the stronger the winds are. The winds will rotate inward toward that central area of low pressure.

When pressures fall, it takes a while for the winds to catch up.

Last Edit: Aug 28, 2012 9:44:24 GMT -6 by SKYSUMMIT

Freezing Days for Winter 20/21: 14
Parler: @scottguidry
MeWe: mewe.com/i/scottguidry1

suncindy2
GCWX Supporter

Posts - 365
Likes - 70

HURRICANE ISAAC Discussion Thread #15 Aug 28, 2012 9:44:55 GMT -6

Post by suncindy2 on Aug 28, 2012 9:44:55 GMT -6

Aug 28, 2012 9:43:44 GMT -6 SKYSUMMIT said:

Aug 28, 2012 9:35:37 GMT -6 504canes said:

What does the pressure do for the storm. Obviously we know what the wind does but what does the pressure falling effect?

Central pressure is everything in a hurricane. Your lowest pressure will be at the center, or eye of the storm and pressures are higher around it. The lower that pressure in the center, the tighter the wind gradient around it and the stronger the winds are. The winds will rotate inward toward that central area of low pressure.

When pressures fall, it takes a while for the winds to catch up.

Great explanation SKy!!

KENNER, LA

thibodauxwx GCWX Supporter Posts - 3,215 Likes - 711	HURRICANE ISAAC Discussion Thread #15 Aug 28, 2012 9:45:36 GMT -6 Select Post Deselect Post Link to Post Back to Top Post by thibodauxwx on Aug 28, 2012 9:45:36 GMT -6 Is this storm turning north?

sc314
Category 1

Posts - 151
Likes - 0

HURRICANE ISAAC Discussion Thread #15 Aug 28, 2012 9:46:16 GMT -6

Post by sc314 on Aug 28, 2012 9:46:16 GMT -6

Word of caution to those that may be out and about and crossing the river. Remember at some point the bridges will be shut down, sorry i forgot the wind speed. This is especially true for the Boggs I-310 bridge here in Destrehan. Don't get stuck on the wrong side of the river with no place to go too.

nolanana GCWX Supporter Posts - 118 Likes - 41	HURRICANE ISAAC Discussion Thread #15 Aug 28, 2012 9:46:36 GMT -6 Select Post Deselect Post Link to Post Back to Top Post by nolanana on Aug 28, 2012 9:46:36 GMT -6 Well evidently - no one explained that to Isaac!!

504canes
Tropical Low

Posts - 38
Likes - 0

HURRICANE ISAAC Discussion Thread #15 Aug 28, 2012 9:47:14 GMT -6

Post by 504canes on Aug 28, 2012 9:47:14 GMT -6

Aug 28, 2012 9:44:55 GMT -6 suncindy2 said:

Aug 28, 2012 9:43:44 GMT -6 SKYSUMMIT said:

Central pressure is everything in a hurricane. Your lowest pressure will be at the center, or eye of the storm and pressures are higher around it. The lower that pressure in the center, the tighter the wind gradient around it and the stronger the winds are. The winds will rotate inward toward that central area of low pressure.

When pressures fall, it takes a while for the winds to catch up.

Great explanation SKy!!

now with the wind not dropping since the pressure is around a cat 2 and the wind obviously at a TS force. Is the pressure really important right now?

46thpsalm
Tropical Low

Posts - 20
Likes - 0

HURRICANE ISAAC Discussion Thread #15 Aug 28, 2012 9:48:18 GMT -6

Post by 46thpsalm on Aug 28, 2012 9:48:18 GMT -6

Baton Rouge TV stations are showing normal daily programming with crawls and occasional breaking into programming. Our radio stations are actually more urgent. I'm happy that Talk 107.3 is carrying full coverage and all the news conferences and preps. Doing a better job than local TV with that.

roorufus
GCWX Supporter

Posts - 197
Likes - 162

HURRICANE ISAAC Discussion Thread #15 Aug 28, 2012 9:48:24 GMT -6

Post by roorufus on Aug 28, 2012 9:48:24 GMT -6

Aug 28, 2012 9:46:16 GMT -6 sc314 said:

Word of caution to those that may be out and about and crossing the river. Remember at some point the bridges will be shut down, sorry i forgot the wind speed. This is especially true for the Boggs I-310 bridge here in Destrehan. Don't get stuck on the wrong side of the river with no place to go too.

SCP said on their site earlier there were no plans to close the bridge during the event.

"You can lead a man to Congress, but you can't make him think." ~ Milton Berle

ndg
GCWX Supporter

Posts - 8,817
Likes - 5,011

Social: - Twitter

HURRICANE ISAAC Discussion Thread #15 Aug 28, 2012 9:49:27 GMT -6

Post by ndg on Aug 28, 2012 9:49:27 GMT -6

Looks like now pressure down to 974mb, lets wait for the VDM.

URNT15 KNHC 281543
AF306 3109A ISAAC HDOB 37 20120828
153430 2807N 08830W 8434 01282 9752 +217 +199 058002 006 013 001 00
153500 2807N 08828W 8432 01282 9748 +214 +205 139011 011 011 003 00
153530 2807N 08826W 8425 01284 9744 +218 +203 158014 016 015 002 00
153600 2808N 08824W 8426 01283 9741 +222 +197 166022 025 021 002 00
153630 2808N 08822W 8430 01279 9745 +220 +201 171027 028 027 003 00
153700 2808N 08820W 8433 01283 9747 +225 +200 174032 033 031 001 00
153730 2808N 08819W 8430 01290 9749 +229 +191 176037 038 034 003 00
153800 2808N 08817W 8429 01294 9756 +222 +209 178042 043 037 003 03
153830 2808N 08815W 8428 01302 9764 +224 +207 181047 048 042 001 00
153900 2808N 08813W 8436 01302 9773 +219 +202 178050 052 044 002 00
153930 2808N 08811W 8431 01312 9779 +220 +199 177057 059 047 002 00
154000 2808N 08810W 8428 01321 9782 +229 +197 176063 065 048 002 00
154030 2808N 08808W 8426 01329 9791 +222 +197 176064 066 049 001 00
154100 2808N 08806W 8446 01315 9805 +212 +194 178061 062 047 001 00
154130 2808N 08805W 8416 01352 9812 +205 +196 178060 060 045 001 00
154200 2808N 08803W 8438 01335 9820 +205 +196 181058 059 045 003 00
154230 2808N 08801W 8426 01351 9826 +200 +199 183057 058 044 002 00
154300 2808N 08759W 8431 01351 9833 +200 +200 184057 058 046 003 01
154330 2808N 08757W 8431 01356 9838 +200 +200 184058 058 046 004 01
154400 2808N 08756W 8436 01357 9843 +202 +195 185064 065 048 002 03
$$

SKYSUMMIT
President | Director of Operations Administrator

Posts - 61,641

Likes - 11,704

Social: - Facebook, Twitter

HURRICANE ISAAC Discussion Thread #15 Aug 28, 2012 9:49:36 GMT -6

Post by SKYSUMMIT on Aug 28, 2012 9:49:36 GMT -6

Aug 28, 2012 9:47:14 GMT -6 504canes said:

Aug 28, 2012 9:44:55 GMT -6 suncindy2 said:

Great explanation SKy!!

now with the wind not dropping since the pressure is around a cat 2 and the wind obviously at a TS force. Is the pressure really important right now?

Yes it is. Remember, recon is finding Cat 2 winds at flight level.

Freezing Days for Winter 20/21: 14
Parler: @scottguidry
MeWe: mewe.com/i/scottguidry1

roorufus
GCWX Supporter

Posts - 197
Likes - 162

HURRICANE ISAAC Discussion Thread #15 Aug 28, 2012 9:50:42 GMT -6

Post by roorufus on Aug 28, 2012 9:50:42 GMT -6

Aug 28, 2012 9:48:24 GMT -6 roorufus said:

Aug 28, 2012 9:46:16 GMT -6 sc314 said:

Word of caution to those that may be out and about and crossing the river. Remember at some point the bridges will be shut down, sorry i forgot the wind speed. This is especially true for the Boggs I-310 bridge here in Destrehan. Don't get stuck on the wrong side of the river with no place to go too.

SCP said on their site earlier there were no plans to close the bridge during the event.

FOR THOSE ASKING ABOUT A CLOSURE OF THE HALE BOGGS BRIDGE: We DO NOT expect the state to close the bridge at any time during Isaac. The only complete closure of the bridge we have witnessed due to weather has been related to those rare south Louisiana snow storms. IF we receive information that the bridge in fact will close at any point, we will of course post it here.

This is from THEIR site

"You can lead a man to Congress, but you can't make him think." ~ Milton Berle

soupbone
GCWX Supporter

Posts - 2,800
Likes - 111

HURRICANE ISAAC Discussion Thread #15 Aug 28, 2012 9:50:53 GMT -6

Post by soupbone on Aug 28, 2012 9:50:53 GMT -6

Ok I have a question after looking at the WV loop. For most of his life, he's at least been exposed on the NE quad from dry air. Now that he's starting to wrap that quad up, even though the rest of him is getting exposed, would that benefit him more than having the other quads?

Gulf Coast Emergency Manager
NWS Skywarn Trained Spotter

504canes
Tropical Low

Posts - 38
Likes - 0

HURRICANE ISAAC Discussion Thread #15 Aug 28, 2012 9:50:58 GMT -6

Post by 504canes on Aug 28, 2012 9:50:58 GMT -6

Aug 28, 2012 9:49:36 GMT -6 SKYSUMMIT said:

Aug 28, 2012 9:47:14 GMT -6 504canes said:

now with the wind not dropping since the pressure is around a cat 2 and the wind obviously at a TS force. Is the pressure really important right now?

Yes it is. Remember, recon is finding Cat 2 winds at flight level.

thanks sky appreciate the explanation

bobeaux Category 1 Posts - 112 Likes - 30	HURRICANE ISAAC Discussion Thread #15 Aug 28, 2012 9:51:49 GMT -6 Select Post Deselect Post Link to Post Back to Top Post by bobeaux on Aug 28, 2012 9:51:49 GMT -6 For y'all out of the area wanting coverage, WWL TV is streaming here: www.wwltv.com/live-stream/exempt

Deleted

Posts - 0
Likes -

HURRICANE ISAAC Discussion Thread #15 Aug 28, 2012 9:52:39 GMT -6

Post by Deleted on Aug 28, 2012 9:52:39 GMT -6

Aug 28, 2012 9:49:27 GMT -6 ndg said:

Looks like now pressure down to 974mb, lets wait for the VDM.

URNT15 KNHC 281543
AF306 3109A ISAAC HDOB 37 20120828
153430 2807N 08830W 8434 01282 9752 +217 +199 058002 006 013 001 00
153500 2807N 08828W 8432 01282 9748 +214 +205 139011 011 011 003 00
153530 2807N 08826W 8425 01284 9744 +218 +203 158014 016 015 002 00
153600 2808N 08824W 8426 01283 9741 +222 +197 166022 025 021 002 00
153630 2808N 08822W 8430 01279 9745 +220 +201 171027 028 027 003 00
153700 2808N 08820W 8433 01283 9747 +225 +200 174032 033 031 001 00
153730 2808N 08819W 8430 01290 9749 +229 +191 176037 038 034 003 00
153800 2808N 08817W 8429 01294 9756 +222 +209 178042 043 037 003 03
153830 2808N 08815W 8428 01302 9764 +224 +207 181047 048 042 001 00
153900 2808N 08813W 8436 01302 9773 +219 +202 178050 052 044 002 00
153930 2808N 08811W 8431 01312 9779 +220 +199 177057 059 047 002 00
154000 2808N 08810W 8428 01321 9782 +229 +197 176063 065 048 002 00
154030 2808N 08808W 8426 01329 9791 +222 +197 176064 066 049 001 00
154100 2808N 08806W 8446 01315 9805 +212 +194 178061 062 047 001 00
154130 2808N 08805W 8416 01352 9812 +205 +196 178060 060 045 001 00
154200 2808N 08803W 8438 01335 9820 +205 +196 181058 059 045 003 00
154230 2808N 08801W 8426 01351 9826 +200 +199 183057 058 044 002 00
154300 2808N 08759W 8431 01351 9833 +200 +200 184057 058 046 003 01
154330 2808N 08757W 8431 01356 9838 +200 +200 184058 058 046 004 01
154400 2808N 08756W 8436 01357 9843 +202 +195 185064 065 048 002 03
$$

I think Irene had the lowest pressure as a tropical storm when it came into New York City as 968mb.

We shall see how low Isaac gets. I'm interested in seeing the wind reports out of southern Plaquemines as the band of more intense weather rotates in.

HURRICANE ISAAC Discussion Thread #15

Post by SKYSUMMIT on Aug 28, 2012 9:43:44 GMT -6

Post by suncindy2 on Aug 28, 2012 9:44:55 GMT -6

Post by thibodauxwx on Aug 28, 2012 9:45:36 GMT -6

Post by sc314 on Aug 28, 2012 9:46:16 GMT -6

Post by nolanana on Aug 28, 2012 9:46:36 GMT -6

Post by 504canes on Aug 28, 2012 9:47:14 GMT -6

Post by 46thpsalm on Aug 28, 2012 9:48:18 GMT -6

Post by roorufus on Aug 28, 2012 9:48:24 GMT -6

Post by ndg on Aug 28, 2012 9:49:27 GMT -6

Post by SKYSUMMIT on Aug 28, 2012 9:49:36 GMT -6

Post by roorufus on Aug 28, 2012 9:50:42 GMT -6

Post by soupbone on Aug 28, 2012 9:50:53 GMT -6

Post by 504canes on Aug 28, 2012 9:50:58 GMT -6

Post by bobeaux on Aug 28, 2012 9:51:49 GMT -6

Post by Deleted on Aug 28, 2012 9:52:39 GMT -6

Welcome All Members & Guests

Support StormCast!

Convective Outlooks

Southeast Louisiana Radar

Today's Weather

Watches and Warnings