Low over the NW GOMEX (Is Invest 90L)

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NDG
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Re: Low over the NW GOMEX

#81 Postby NDG » Mon Jul 20, 2020 10:10 am

Ivanhater wrote:What are the winds like?


Fairly light so far, not much pressure gradient so far.
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Re: Low over the NW GOMEX

#82 Postby wxman57 » Mon Jul 20, 2020 10:11 am

Ivanhater wrote:What are the winds like?


Offshore obs indicating 5-15 kts. Low isn't too far offshore Galveston now.
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Re: Low over the NW GOMEX

#83 Postby NDG » Mon Jul 20, 2020 10:12 am

Aric Dunn wrote:
TheAustinMan wrote:It looks nice now, but the big question that faces this low (and many other fleeting features like it) is if it will maintain itself long after the morning. The vertical column is moist, but not aggressively so.

At its 00z run, the members of the SPC HREF ensemble (see below) generally had the system becoming a diffuse scattering of cirrus clouds by the evening. That said, the system looks a little better right now than the ensemble had for this time. It will be interesting to see how it interacts with the Texas onshore flow this evening. Closing off a center in the meantime would provide a focusing mechanism for moisture and convection.

589 KB. Source: SPC HREF
https://i.imgur.com/Pk7nIxB.png



yep always have to watch out for that sea breeze disruption..
one thing it does have going for it in regards to that.. is current rain fall along much of the coast..

surface base heating should be far inland and may not allow for much of a sea breeze to develop along the southern texas coast.


Also if the low pressure center stays further offshore even if the sea breeze develops later this afternoon it should not disrupt it.
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Re: Low over the NW GOMEX

#84 Postby MississippiWx » Mon Jul 20, 2020 10:16 am

There might have been an old low pressure that is about to come onshore in Galveston, but visible satellite is plain as day that something else is trying to form further offshore. It still has the entire day to form into something new. This is a classic NW Gulf spin-up storm.
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Re: Low over the NW GOMEX

#85 Postby wxman57 » Mon Jul 20, 2020 10:21 am

MississippiWx wrote:There might have been an old low pressure that is about to come onshore in Galveston, but visible satellite is plain as day that something else is trying to form further offshore. It still has the entire day to form into something new. This is a classic NW Gulf spin-up storm.


Obs indicate a trof extending from Galveston to about 120 miles SE of Galveston. One weak low is moving ashore shortly. It's possible another could form before the whole mess moves ashore tonight. Unlikely it will be upgraded to a TD though. We REALLY need some rain in SW Houston.
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Re: Low over the NW GOMEX

#86 Postby MississippiWx » Mon Jul 20, 2020 10:29 am

wxman57 wrote:
MississippiWx wrote:There might have been an old low pressure that is about to come onshore in Galveston, but visible satellite is plain as day that something else is trying to form further offshore. It still has the entire day to form into something new. This is a classic NW Gulf spin-up storm.


Obs indicate a trof extending from Galveston to about 120 miles SE of Galveston. One weak low is moving ashore shortly. It's possible another could form before the whole mess moves ashore tonight. Unlikely it will be upgraded to a TD though. We REALLY need some rain in SW Houston.


Agreed.

More than likely doesn’t have time to be upgraded. Hope you get some rain.
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Re: Low over the NW GOMEX

#87 Postby davidiowx » Mon Jul 20, 2020 10:35 am

wxman57 wrote:
MississippiWx wrote:There might have been an old low pressure that is about to come onshore in Galveston, but visible satellite is plain as day that something else is trying to form further offshore. It still has the entire day to form into something new. This is a classic NW Gulf spin-up storm.


We REALLY need some rain in SW Houston.


You can say that AGAIN! Bring it on!
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Re: Low over the NW GOMEX

#88 Postby TheAustinMan » Mon Jul 20, 2020 10:43 am

A little elongated but pretty good on a ScatSat-1 pass from 1420z. The center appears to have become more evident farther southeast, consistent with the offshore oil rig obs and radar velocities.

173KB. Source: KNMI
Image

243KB. Source: KNMI
Image
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Re: Low over the NW GOMEX

#89 Postby Aric Dunn » Mon Jul 20, 2020 10:46 am

TheAustinMan wrote:A little elongated but pretty good on a ScatSat-1 pass from 1420z. The center appears to have become more evident farther southeast, consistent with the offshore oil rig obs and radar velocities.

173KB. Source: KNMI
https://i.imgur.com/DQgZ70A.png

243KB. Source: KNMI
https://i.imgur.com/rVb0IpY.png



Yeah it does not take much to se that this is closed and not a trough.

surface obs are very consistent and clear. nothing is coming ashore anytime soon.

it is still swinging ese towards the convection.
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Re: Low over the NW GOMEX (Is Invest 90L)

#90 Postby cycloneye » Mon Jul 20, 2020 11:18 am

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