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2015 Tropical Season Thread


CT Valley Snowman

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I doubt that, look how the estimates continue to go up

 

2015AUG21 121500  3.8  993.4  61.0  3.8 4.9 5.3  1.7T/6hr  OFF  OFF  -20.66 -59.27  EYE    -99 IR   9.0   13.87   47.73  SPRL   GOES13 35.3 
2015AUG21 124500  4.0  990.7  65.0  4.0 5.0 5.2  1.7T/6hr  OFF  OFF  -20.46 -58.79  EYE      9 IR   9.0   13.89   47.85  SPRL   GOES13 35.2 
2015AUG21 131500  4.2  987.3  69.8  4.2 5.0 5.4  1.7T/6hr  OFF  OFF   -7.16 -58.41  EYE     11 IR   9.0   13.94   47.91  SPRL   GOES13 35.2 

 

I hadn't looked at any hard data, but to me it doesn't look to intensify much longer, then...

The last update on that is a couple of hours old, though...the IR imagery has eroded a hair since then.

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Glad you went there....if it doesn't bend west quickly, I think it misses the islands by the stubbies on Kev's grape.

There is definitely a stronger shear axis ahead that Danny will need to overcome. You can see it clearly on IR loop, however once passed that point, if far enough North, the shear would be virtually zero once North of Puerto Rico. It's no surprise that some of the latest guidance has a weakening trend followed by re intensification. 

 

wg8sht.GIF

 

04L_intensity_latest.png

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I'm not sure how much you can tell by looking at the IR loop. Especially when you're dealing with such a small cane and wind field.

Yea, cooling cloud tops are usually what you want to see in an intensifying system.

 

Can I look through recon data to confirm??

Maybe it's diff in small systems...could be healthy.

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Yea, cooling cloud tops are usually what you want to see in an intensifying system.

 

Can I look through recon data to confirm??

Maybe it's diff in small systems...could be healthy.

It's almost to the diurnal minimum so even though cloud tops have warmed a tad on the Western semi-circle I wouldn't say that's significant at this time. The eye is still very well defined and outflow is still well established in all four quadrants. It could also be starting to feel the effects of the shear axis to the NW.

 

For the record, I wasn't telling you to ride the short bus. All I was saying is that you're better off checking multiple data sources before making an assertion.  

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Boom, up to 105 MPH at 11AM advisory, almost a major.

 

ZCZC MIATCPAT4 ALL
TTAA00 KNHC DDHHMM

BULLETIN
HURRICANE DANNY ADVISORY NUMBER 13
NWS NATIONAL HURRICANE CENTER MIAMI FL AL042015
1100 AM AST FRI AUG 21 2015

...DANNY STRENGTHENS INTO A CATEGORY 2 HURRICANE...


SUMMARY OF 1100 AM AST...1500 UTC...INFORMATION
-----------------------------------------------
LOCATION...14.0N 48.2W
ABOUT 930 MI...1495 KM E OF THE LEEWARD ISLANDS
MAXIMUM SUSTAINED WINDS...105 MPH...165 KM/H
PRESENT MOVEMENT...WNW OR 290 DEGREES AT 10 MPH...17 KM/H
MINIMUM CENTRAL PRESSURE...976 MB...28.82 INCHES


WATCHES AND WARNINGS
--------------------
There are no coastal watches or warnings in effect.

Interests in the Leeward Islands should monitor the progress of
Danny.


DISCUSSION AND 48-HOUR OUTLOOK
------------------------------
At 1100 AM AST (1500 UTC), the center of Hurricane Danny was located
near latitude 14.0 North, longitude 48.2 West. Danny is moving
toward the west-northwest near 10 mph (17 km/h), and this motion is
expected to continue through tonight. A turn toward the west is
expected on Saturday or Saturday night.

Maximum sustained winds have increased to near 105 mph (165 km/h)
with higher gusts. Danny is about to encounter a less conducive
environment, and weakening is forecast during the next 48 hours. A
NOAA Hurricane Hunter aircraft is scheduled to investigate Danny
late this afternoon.

Danny remains a tiny hurricane. Hurricane force winds extend
outward up to 15 miles (30 km) from the center and tropical storm
force winds extend outward up to 70 miles (110 km).

The estimated minimum central pressure is 976 mb (28.82 inches).
 

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It's almost to the diurnal minimum so even though cloud tops have warmed a tad on the Western semi-circle I wouldn't say that's significant at this time. The eye is still very well defined and outflow is still well established in all four quadrants. It could also be starting to feel the effects of the shear axis to the NW.

 

For the record, I wasn't telling you to ride the short bus. All I was saying is that you're better off checking multiple data sources before making an assertion.  

Great point regarding diurnal max.

 

Theoretically, true, but I like doing sat. estimations...fun.

 

I could see if I said something dumb, like suggesting they should upgrade it to cat 4.....but suggesting that it had peaked for now is not outlandish.

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I think we have all seen this movie already...

 

HURRICANE DANNY DISCUSSION NUMBER 13
NWS NATIONAL HURRICANE CENTER MIAMI FL AL042015
1100 AM AST FRI AUG 21 2015

Danny has continued to strengthen during the past several hours.
The small eye has become better defined, and it is now embedded in
a circular central dense overcast. In addition, the ragged outer
banding has increased in coverage and now surrounds the central
convection. The initial intensity is increased to 90 kt in
agreement with satellite intensity estimates from TAFB and SAB. It
is notable that experimental multispectral METEOSAT imagery suggests
that low-level moisture has wrapped around the cyclone and pushed
the drier air farther away. This could be helping both the
intensification and the increase in outer banding.

The initial motion is 290/9. The subtropical ridge north of Danny
remains weaker than normal due to a deep-layer trough over the
western Atlantic. This trough is expected to lift northward in a
couple of days, allowing the ridge to build westward and
strengthen. This evolution should cause Danny to turn more
westward with some increase in forward speed. The track guidance
is in good agreement with this scenario and forecasts Danny to be
near the Leeward Islands in about 72 hours, near Puerto Rico in
about 96 hours, and near Hispaniola in about 120 hours. The new
forecast track, which is in best agreement with the GFS and ECMWF
models, lies close to the previous forecast through 96 hours and a
little to the north of the previous forecast at 120 hours.

Danny is currently in an environment of light vertical wind shear.
However, it is about to encounter increasing upper-level
southwesterly flow associated with a trough over the northeastern
Caribbean, with the shear forecast to increase to over 20 kt by 96
hours. This, combined with the abundant dry air remaining along the
forecast track, should cause Danny to weaken below hurricane
strength as it approaches the Caribbean islands. The new intensity
forecast is a little stronger than the intensity consensus through
96 hours. After that, it is weaker than most of the guidance due
to the expected interaction with land.

A NOAA aircraft will be conducting a research mission in and around
Danny this afternoon, and an Air Force Reserve Unit reconnaissance
aircraft will investigate Danny Saturday afternoon. These data
will provide a better assessment of the intensity and structure of
the hurricane.



FORECAST POSITIONS AND MAX WINDS

INIT 21/1500Z 14.0N 48.2W 90 KT 105 MPH
12H 22/0000Z 14.5N 49.6W 90 KT 105 MPH
24H 22/1200Z 15.1N 51.7W 85 KT 100 MPH
36H 23/0000Z 15.5N 54.0W 75 KT 85 MPH
48H 23/1200Z 16.0N 56.4W 65 KT 75 MPH
72H 24/1200Z 17.0N 61.5W 55 KT 65 MPH
96H 25/1200Z 18.0N 66.0W 50 KT 60 MPH
120H 26/1200Z 19.5N 71.0W 40 KT 45 MPH...INLAND

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Great point regarding diurnal max.

 

Theoretically, true, but I like doing sat. estimations...fun.

 

I could see if I said something dumb, like suggesting they should upgrade it to cat 4.....but suggesting that it had peaked for now is not outlandish.

Well you said 90MPH max and it's now 105MPH so....

 

90 MPH...tops.

Danny has peaked....

 

 

Doesn't matter, hopefully we can get this up to a Cat 3 for the 5PM advisory. The latest discussion states that the core is very well established and the better organized the better chance it has to survive.

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Well you said 90MPH max and it's now 105MPH so....

 

Doesn't matter, hopefully we can get this up to a Cat 3 for the 5PM advisory. The latest discussion states that the core is very well established and the better organized the better chance it has to survive.

So what?

 

Are you that guy who reminds everyone for an entire season when they miss a snowfall call?

 

My call was not outlandish.

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So what?

 

Are you that guy who reminds everyone for an entire season when they miss a snowfall call?

 

My call was not outlandish.

Stop taking it personal. I was having a little bit of fun at your expense. It's funny how when someone makes a definitive call in meteorology they usually end up being wrong. 

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Stop taking it personal. I was having a little bit of fun at your expense. It's funny how when someone makes a definitive call in meteorology they usually end up being wrong. 

Right.

Next time I'll give a 10 mph range.

 

Would you have slept better at night if I had said 90-100mph?

If I had a weenie for every time someone throughout a single snowfall number for fun....

 

You may enjoy the main tropical thread better.

You'd fit right in.

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Sorry I derailed the thread.

My bad.

 

I think the reason I missed was I failed to take into account the period of time in between advisories in which Danny had a very defined ring of cold cloud tops around the eye.

It had obviously gone to town during that time.....even though the presentation currently not quite as impressive.

 

Dumb mistake.

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