99L Invest E of Windwards,Comments,Sat Pics,Models Thread #2

#61 Postby **JonathanBelles** » Fri Jul 28, 2006 4:39 pm

MortisFL wrote:
White Cap wrote:What the heck is a diurinal maximum?

What the heck is a Giga-watt?

he asked a question that i asked yesterday, and never got a complete answer to. no jokes please.

vacanechaser · #62 Postby **vacanechaser** » Fri Jul 28, 2006 4:40 pm

rjgator wrote:
sse,
Posted: Fri Jul 28, 2006 4:26 pm Post subject:

mike815 wrote:
It doesnt really necissarly mean anything and im not sure if this has been mentioned in here but the ships model brings this system up to Cat. 2 intensity. I know it really isnt something to go crazy over just noticed it.

http://euler.atmos.colostate.edu/~vigh/ ... nsity1.png

i dont see that in the text print out of the models.. it does however show 69kts at 120 hours... or 81mph... still cat 1... 18z run

Jesse V. Bass III
http://www.vastormphoto.com
Hurricane Intercept Research Team

Nice to see you here Jesse. What are your feelings on this one?

right now, not sure... i think we could have something here... but, it needs to slow, and start getting north... so far though, the convection of course is down from yesterday and this morning, but it is still there and fighting back all the time it seems... this looked like it was on a trend for most of the convection to die off earlier today, but it didnt... it is approaching the beginning of the oceanic heat content, although not all that impressive, it is warmer, deeper than where it is now it would appear.. that is certainly working in its favor... the low is not closed, but it does, or did have a nice low level circulation this afternoon... it just reminds me of a lot of systems we have tracked in the past few years that all the pro mets and other folks have just about written it off, and they seem to come right back... it just appears to me at this time to be continuing that trend... but it does need to slow, and that should happen in a day or so...

Jesse V. Bass III
http://www.vastormphoto.com
Hurricane Intercept Research Team

TS Zack · #63 Postby **TS Zack** » Fri Jul 28, 2006 4:40 pm

Dirunal Max....Nighttime! Woohoo!

Many times covection across the tropical waters reach their peak or develop in the overnight hours.

floridahurricaneguy · #64 Postby **floridahurricaneguy** » Fri Jul 28, 2006 4:44 pm

I also think this is the first major player of the season. Possibly east coast of florida threat? maybe? Definitely a system that needs to be watched.

vacanechaser · #65 Postby **vacanechaser** » Fri Jul 28, 2006 4:44 pm

TS Zack wrote:Dirunal Max....Nighttime! Woohoo!

Many times covection across the tropical waters reach their peak or develop in the overnight hours.

beat me to it zack..

thats right... last night this thing was going to town, but today not so much... as the atmosphere cools at night around the system, correct me if i am wrong, this allows what center there is to be warmer than the surrounding air and that helps to increase the thunderstorm activity... i think thats right, or at least partly right... lol...

Jesse V. Bass III
http://www.vastormphoto.com
Hurricane Intercept Research Team

x-y-no · #66 Postby **x-y-no** » Fri Jul 28, 2006 4:46 pm

White Cap wrote:What the heck is a diurinal maximum?

Convection in the tropics, particularly in areas of large convective clusters, tends to peak in the early morning hours.

IIRC, it was Bill Gray who discovered this back in the mid 70's.

White Cap · #67 Postby **White Cap** » Fri Jul 28, 2006 4:48 pm

This is getting way too over my head. :cry:

#68 Postby **JonathanBelles** » Fri Jul 28, 2006 4:49 pm

thank you all who answered my question.

x-y-no · #69 Postby **x-y-no** » Fri Jul 28, 2006 4:50 pm

That's exactly right, Jesse.

White Cap · #70 Postby **White Cap** » Fri Jul 28, 2006 4:53 pm

Thanks to all - I am trying!

x-y-no · #71 Postby **x-y-no** » Fri Jul 28, 2006 4:56 pm

White Cap wrote:Thanks to all - I am trying!

Hang in there!

The tropics are a fascinating subject, and no matter how much you learn there'll always be more. 8-)

vacanechaser · #72 Postby **vacanechaser** » Fri Jul 28, 2006 4:59 pm

x-y-no wrote:That's exactly right, Jesse.

yeaahhhaaa!! i got something right in the past week... lol.. what a week...

it works like this,

remember a hurricane or tropical system is a warm core system.... tht means that the center of the hurricane is much warmer than outside.. maybe only a few degrees, but it is warmer... the hurricane/ tropical system releases the heat through the process called laten heat.. this is really what helps to drive the system... in the late season, we see a cluster of storms or low in the atlantic which is over warm water but lacks the kick to get it going... when we see a big shot of cooler air move into the region, we can see these systems develop rather quickly due to the temperature difference from the core, to the surrounding air... so the same would work for the diurinal maximum, at night as the surrounding air cools.. the process is still taking place within the center or core releasing that heat, and that clash of temperature difference can cause the storms to increase, and the circulation center to tighten at times...

hope that helps.. think it confussed me!! lol

Jesse V. Bass III
http://www.vastormphoto.com
Hurricane Intercept Research Team

jabber · #73 Postby **jabber** » Fri Jul 28, 2006 4:59 pm

I know when it occurs but can anyone tell me why?

x-y-no wrote:
White Cap wrote:What the heck is a diurinal maximum?

Convection in the tropics, particularly in areas of large convective clusters, tends to peak in the early morning hours.

IIRC, it was Bill Gray who discovered this back in the mid 70's.

vacanechaser · #74 Postby **vacanechaser** » Fri Jul 28, 2006 5:02 pm

jabber wrote:I know when it occurs but can anyone tell me why?

x-y-no wrote:
White Cap wrote:What the heck is a diurinal maximum?

Convection in the tropics, particularly in areas of large convective clusters, tends to peak in the early morning hours.

IIRC, it was Bill Gray who discovered this back in the mid 70's.

read above...

Jesse V. Bass III
http://www.vastormphoto.com
Hurricane Intercept Resaerch Team

jabber · #75 Postby **jabber** » Fri Jul 28, 2006 5:02 pm

Thanks.... I am thinking a course in Thermodynamics would be in order to truly understand the mechanism... maybe next year

vacanechaser wrote:
x-y-no wrote:That's exactly right, Jesse.

yeaahhhaaa!! i got something right in the past week... lol.. what a week...

it works like this,

remember a hurricane or tropical system is a warm core system.... tht means that the center of the hurricane is much warmer than outside.. maybe only a few degrees, but it is warmer... the hurricane/ tropical system releases the heat through the process called laten heat.. this is really what helps to drive the system... in the late season, we see a cluster of storms or low in the atlantic which is over warm water but lacks the kick to get it going... when we see a big shot of cooler air move into the region, we can see these systems develop rather quickly due to the temperature difference from the core, to the surrounding air... so the same would work for the diurinal maximum, at night as the surrounding air cools.. the process is still taking place within the center or core releasing that heat, and that clash of temperature difference can caus ethe storms to increase, and the circulation center to tighten at times...

hope that helps.. think it confussed me!! lol

Jesse V. Bass III
http://www.vastormphoto.com
Hurricane Intercept Research Team

#76 Postby **AnnularCane** » Fri Jul 28, 2006 5:27 pm

x-y-no wrote:
White Cap wrote:Thanks to all - I am trying!

Hang in there!

The tropics are a fascinating subject, and no matter how much you learn there'll always be more.

Tell me about it. I used to think I knew everything about the tropics, but lately I have been hearing about things I never knew existed!

Ola · #77 Postby **Ola** » Fri Jul 28, 2006 6:13 pm

fact789 wrote:
MortisFL wrote:
White Cap wrote:What the heck is a diurinal maximum?

What the heck is a Giga-watt?

he asked a question that i asked yesterday, and never got a complete answer to. no jokes please.

Some ppl already gave an awnser to this but Im gonna try to put it in more simple terms.

Over land, you get afternoon thunderstorms. Why? Because during the day the sun heats up the surface and the air above the surface gets warm, warmer than the air above it. This causes this air to rise. Rising air cools off and condenses moisture which turns into clouds and thunderstorms. At night, the surface of land cools and the air aboves it cools, and this rising motion does not happen. It is the same principle of Hot air baloons, which makes them fly.

IN the ocean it is the opposite. Sunlight gets absorbed in the water and it is not released in the air as heat like what happens over land. That's why water is the same temperature during the day and during the night but not your driveway. So this diurnal effect does not happen over water. But at night, something similar takes place for different reasons. During the night, the surface of the water stays the same, thus keeping the air above it around the same temperature, BUT the air higher in the atmosphere does cool off at night. This causes a similar effect because the air at the surface is now warmer than the air above it, but not because the air in the surface got warmer, but because the air above it got cooler. Anyways this temperature difference causes the same hot air balloon effect (but not as pronounced as over land) and that's why during the mooring hours you get the most convection in the tropics relatively speaking all other things considered equal.

jabber · #78 Postby **jabber** » Fri Jul 28, 2006 6:20 pm

Invest does not look very healthy (to me) right now. Plus its still to south....

Extremeweatherguy · #79 Postby **Extremeweatherguy** » Fri Jul 28, 2006 6:33 pm

jabber wrote:Invest does not look very healthy (to me) right now. Plus its still to south....

I think it looks healthy (considering it is encountering some of the roughest weather it will face over the next many days). Once in the Caribbean, I think this will explode.

Weatherfreak000 · #80 Postby **Weatherfreak000** » Fri Jul 28, 2006 6:35 pm

The convection appears to be racing past the suggested "center". This thing is looking very very ragged indeed.

99L Invest E of Windwards,Comments,Sat Pics,Models Thread #2

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