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Tropical Storm Henri


wxeyeNH
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Just now, WeatherHappens said:

in you opinion what are the chances SNE gets a direct hit?

I just really started looking at this within the half hour and I don't consider myself to be extremely knowledgeable with tropical so my thoughts should be taken with a grain of salt.

Typically you'd like to see a trough sliding or amplifying moving across the Ohio Valley as a means to capture a storm and bring it up the coast. However, in this scenario, given Henri's latitude and the synoptic pattern I don't think that would be necessary in this scenario. There are a few key features that seem to glare out:

1. Potential development of high pressure across southeast Canada (there seem to be some differences in this development and overall structure, strength, placement)

2. Potential development of an upper-level low across the eastern-tier of the Ohio Valley (which models seem to be in pretty strong agreement on)

3. Bermuda High 

4. Actual strength of Henri moving through the weekend (this could be the biggest key overall)

I think a scenario like the GFS is showing is very low probability (but not impossible). I think direct impacts to SNE are low probability (not to say we may not see some showers, gusty winds) but surf will be very dangerous. The probability increases a bit heading out towards Cape Cod but perhaps not by much. 

What scares me about this type of scenario is lead time...if this sort of solution is say still on the table tomorrow...or Friday but guidance continues to be poor agreement...a massive decision needs to be made about how to communicate this to the public. 2-3 days for preparations really isn't enough (especially in a more dire scenario). 

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39 minutes ago, OSUmetstud said:

 

ATCF IDENTIFIER : AL082021 LEAD CENTRAL MAXIMUM WIND VERIFYING TIME TIME POSITION PRESSURE (MB) SPEED (KNOTS) -------------- ---- -------- ------------- ------------- 1200UTC 18.08.2021 0 29.9N 66.1W 1004 40 0000UTC 19.08.2021 12 29.7N 68.4W 999 51 1200UTC 19.08.2021 24 29.5N 70.6W 987 61 0000UTC 20.08.2021 36 29.5N 72.5W 983 63 1200UTC 20.08.2021 48 30.0N 73.9W 981 65 0000UTC 21.08.2021 60 31.3N 74.3W 976 68 1200UTC 21.08.2021 72 33.7N 73.2W 961 85 0000UTC 22.08.2021 84 37.4N 71.3W 960 81 1200UTC 22.08.2021 96 41.1N 70.2W 962 79 0000UTC 23.08.2021 108 42.4N 69.9W 986 46 1200UTC 23.08.2021 120 43.0N 68.0W 996 35 0000UTC 24.08.2021 132 43.4N 65.5W 1003 27 1200UTC 24.08.2021 144 44.2N 62.5W 1005 25

Doesn't copy well but this is the last UKMET TC guidance. I think it goes over the cape as it weakens? 

Ukie is a crush job 

964 s of mvy 

977 into cape 

moving slow 

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It’s not where it needs to be, but the euro has initialized much better than prior runs. I personally don’t look at the SLP at initialization, but rather the level of organization at low levels.
 

5 minutes ago, Newman said:

Euro still isn't initializing Henri correctly. Still only shows it as a 1011mb low pressure compared to the GFS which correctly initializes ~996mb

 

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3 minutes ago, WxWatcher007 said:

It’s not where it needs to be, but the euro has initialized much better than prior runs. I personally don’t look at the SLP at initialization, but rather the level of organization at low levels.
 

 

Yes...the obsession with the precise initialized minimum central pressure is strange.

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Now that I look closer at the GFS...

That's a boring solution for storm enthusiasts frankly.   It's lifting the cyclostrophic disk above the BL by the time that cross L.I. ... That 990 low at the time/position near NYC, probably doesn't bring much down to the surface given the rate of weakening and the decoupling from the cold water/land interference imposed leading and during that time. 

Sorry. 

Then it comes over a quick responder stream over banks deal... something more like that. 

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