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2021 Atlantic Hurricane Season Tracking Thread


WxWatcher007
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We're baaaaacckkk

giphy.gif?cid=ecf05e475tr8k4m9kxwswbob1x

Another active season is expected, though there is enough uncertainty with ENSO that a hyperactive season seems unlikely at this point. 

We have our first orange of the season. 

o7RNHUA.png

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
200 PM EDT Wed May 19 2021

For the North Atlantic...Caribbean Sea and the Gulf of Mexico:

1. A non-tropical low pressure system is forecast to develop a few 
hundred miles northeast of Bermuda by tomorrow afternoon and 
produce gale-force winds. The low is then forecast to move 
west-southwestward over warmer waters on Friday and could become a 
short-lived subtropical cyclone over the weekend to the northeast 
of Bermuda.  The system is expected to move toward the north and 
northeast into a more hostile environment by Monday.  For more 
information on this system, please see High Seas forecasts issued 
by the Ocean Prediction Center.
* Formation chance through 48 hours...low...10 percent.
* Formation chance through 5 days...medium...40 percent.

High Seas Forecasts for this system can be found under AWIPS header 
NFDHSFAT1, WMO header FZNT01 KWBC, and online at 
ocean.weather.gov/shtml/NFDHSFAT1.php

Forecaster Blake
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Tropical Weather Outlook
NWS National Hurricane Center Miami FL
800 PM EDT Wed May 19 2021

For the North Atlantic...Caribbean Sea and the Gulf of Mexico:

1. A large area of cloudiness and thunderstorms has developed several 
hundred miles east of Bermuda. A non-tropical low pressure system is 
expected to form within this broad cloud system a few hundred miles 
northeast of Bermuda by tomorrow and produce gale-force winds. The 
low is then forecast to move westward and southwestward over warmer 
waters on Friday, and will likely become a short-lived subtropical 
cyclone late Friday and into the weekend near and to the northeast 
of Bermuda.  The system is expected to move toward the north and 
northeast into a more hostile environment by late Sunday into 
Monday.  For more  information on this developing system, please 
see High Seas forecasts issued by the Ocean Prediction Center.
* Formation chance through 48 hours...low...30 percent.
* Formation chance through 5 days...medium...60 percent.
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Looking goodly.

ZCZC MIATWOAT ALL
TTAA00 KNHC DDHHMM

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
800 AM EDT Thu May 20 2021

For the North Atlantic...Caribbean Sea and the Gulf of Mexico:

1. A non-tropical low pressure system is located about 800 miles east 
of Bermuda.  The low is expected to develop gale-force winds later 
today while it moves generally northward. The low is then forecast 
to move westward and southwestward over warmer waters tonight and 
Friday, and it will likely become a subtropical cyclone near and to 
the northeast of Bermuda on Friday. The system is expected to move 
toward the north and northeast into a more hostile environment by 
late Sunday into Monday. For more information on this developing low 
pressure area, please see High Seas forecasts issued by the NOAA 
Ocean Prediction Center and forecast products issued by the Bermuda 
Weather Service.
* Formation chance through 48 hours...high...70 percent.
* Formation chance through 5 days...high...90 percent.

Forecaster Beven
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NOAA outlook has arrived and no surprise it’s calling for another active season.

MDR (Main Development Region) remains behind last year’s historic pace in temp anomalies but just like the past few seasons, we’re seeing big warmth in the homebrew regions. Given that a neutral ENSO reduces shear, that’s a meaningful signal for a favorable western Atlantic provided the steering pattern is ridge dominant.

SST

6SBmBS0.png

vw32DoC.png
 

Depth 26° C

rMuS0b3.png

mad95z4.png

 

TCHP

UXVaMyA.png


Sr09IJV.png
 

Current Anomalies (note that the SST distribution in the subtropics north of the MDR now tends to translate to above normal MDR temps during the peak of the season)

r5ZN0VK.png

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12z Euro could be spazing out but it takes that little MCS off the Texas coast and develops it into a short-lived low over the next 24-48 hours. 

These old features are a way to get tropical genesis, but the SSTs off the Texas coast are marginal. Wonder if the ensembles follow. Last year the Euro really struggled with TC genesis. 
 

 

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Invest 91L is looking more organized this morning and quickly went from nothing to an orange. Still a marginal environment, especially near the coast. Needs some convection to raise the chances of TC genesis and bring the first landfall of the season.

64582751.gif?0.9400762073590015

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
800 AM EDT Fri May 21 2021

For the North Atlantic...Caribbean Sea and the Gulf of Mexico:

1. Showers and thunderstorms associated with a non-tropical low 
pressure area centered about 450 miles east-northeast of Bermuda 
have become better organized during the past several hours.  The 
low has not yet acquired subtropical storm characteristics.  
However, if current trends continue advisories could be initiated 
on the system later today or tonight as it moves westward 
to west-southwestward to the northeast of Bermuda.  Subsequently, 
the low is forecast to move northeastward into a more hostile 
environment by Saturday night or Sunday.  Additional information on 
this low pressure area can be found in High Seas forecasts issued by 
the NOAA Ocean Prediction Center and forecast products, including a 
tropical storm watch, issued by the Bermuda Weather Service.
* Formation chance through 48 hours...high...90 percent.
* Formation chance through 5 days...high...90 percent.

2. Recent satellite imagery suggests that a low-level circulation is 
forming associated with the mid- to upper-level disturbance over the 
western Gulf of Mexico. However, shower and thunderstorm activity 
remains disorganized. Environmental conditions are expected to be 
marginally conducive for development, and a short-lived tropical 
depression or storm could form before the disturbance moves inland 
over the northwestern Gulf coast tonight. Regardless of development, 
the system could produce heavy rainfall over portions of 
southeastern Texas and southwestern Louisiana during the next few 
days.  Additional information on the rainfall and flooding potential 
can be found in products issued by your local National Weather 
Service Forecast Office. 
* Formation chance through 48 hours...medium...40 percent.
* Formation chance through 5 days...medium...40 percent.

High Seas Forecasts issued by the National Weather Service can be 
found under AWIPS header NFDHSFAT1, WMO header FZNT01 KWBC, and 
online at ocean.weather.gov/shtml/NFDHSFAT1.php

Forecaster Beven/Papin

 

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91L up to 60% odds. Not a lot of time left to develop. 
 

2pm outlook. Odds up to 60%.

2. Surface observations and recent satellite wind data indicate that a 
well-defined low pressure system over the western Gulf of Mexico has 
winds of 30-35 mph near and east of the center. The associated 
shower and thunderstorm activity remains limited, but any increase 
in this activity may result in the formation of a short-lived 
tropical depression or storm before the system moves inland over the 
northwestern Gulf coast tonight, and potential tropical cyclone 
advisories may be needed as early as this afternoon.  Regardless of 
development, the system could produce heavy rainfall over portions 
of southeastern Texas and southwestern Louisiana through Saturday.  
Given the complete saturation of soils with ongoing river flooding 
along the Texas and Louisiana coastal areas, heavy rain could lead 
to flash, urban, and additional riverine flooding across this 
region.  Additional information on the rainfall and flooding 
potential can be found in products issued by your local National 
Weather Service Forecast Office. 
* Formation chance through 48 hours...medium...60 percent.
* Formation chance through 5 days...medium...60 percent.

87662172.gif?0.6755057948703982

 

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  • 2 weeks later...

Just a quick and lazy update on my part. 

Hurricane season officially begin tomorrow. There's a slight but growing signal that the first legitimate window for development in the western Atlantic (including western Caribbean) opens up near the middle of the month.

To be clear, it's still early, but we're now starting to see that western Atlantic minimally conducive from a SST standpoint (just recall SSTs were below 26C ten days ago for 91L) and guidance suggests that wind shear in the western Atlantic will be lower and we could see a favorable MJO state for development near the middle of the month. Anything that develops in the western Caribbean would have a shot at decent development given the oceanic environment. Long way to go but something to keep an eye on. As you can see below, this is a climo favored spot in the first 2/3 of June.  

cdas-sflux_sst_watl_1.png

2021150at.jpg

 

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jun_11_20_sm.png

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7 hours ago, midatlanticweather said:

Just working on compiling the Hurricane History around the Northern Virginia area. Anyone have some good resources that will help me in my endeavors? 

Thanks, and welcome to the season!

 

Maybe LWX has something? What specifically are you looking to compile?

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6 minutes ago, Eskimo Joe said:

06z GFS has some weak tropical-esque system coming right up the Chesapeake around HR 340. 

And naturally, it completely vaporizes even before precip gets to DC for the most part :lol: - would not be shocking to see that happen. 

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51 minutes ago, Eskimo Joe said:

06z GFS has some weak tropical-esque system coming right up the Chesapeake around HR 340. 

Both the GEFS and EPS have a little signal for some type of tropical development in the Gulf or Caribbean around mid month. It'd fit climo and that's where the best SSTs and TCHP are right now (especially Caribbean). 

49 minutes ago, SnowenOutThere said:

Is it too predictable to make a lock it in joke?

Just wait until the peak of the season. There's always one run that goes nuclear for the region :lol: 

37 minutes ago, PrinceFrederickWx said:

Slightly off-topic, but NHC should just officially move the Atlantic season start from June 1 to May 15 to match the Pacific. Seems like every year has a May system now. I don't know if there's a reason for this- climate change or just some multi-decade oscillation?

Seven straight years. I think it's more multi-decade oscillation for early stuff and climate change for stronger, more moisture laden, and slower tropical systems. 

Most of what we see in May is still weak stuff. I've heard some say that if we saw hurricanes in May, that'd probably change the starting date, because people need a different level of communication and prep for that. I liked that they started doing regular outlooks on May 15. 

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30 minutes ago, PrinceFrederickWx said:

We're expecting another baby boy in early October, and just found out the name we had picked is actually on the hurricane names list this year. It's pretty far down the list so it's possible to be a hit here right around that time. B)

 

Congrats!

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1 hour ago, PrinceFrederickWx said:

We're expecting another baby boy in early October, and just found out the name we had picked is actually on the hurricane names list this year. It's pretty far down the list so it's possible to be a hit here right around that time. B)

 

Hopefully not Odette or Ida. ;)

 

 

(anyone see what I did there?)

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CSU has released their new outlook.

“We have maintained our above-average forecast for the 2021 Atlantic basin hurricane season. Current neutral ENSO conditions are anticipated to persist for the next several months. While sea surface temperatures averaged across portions of the tropical Atlantic are near to slightly below normal, subtropical North Atlantic sea surface temperatures are much warmer than average. We anticipate an above-normal probability for major hurricanes making landfall along the continental United States coastline and in the Caribbean. As is the case with all hurricane seasons, coastal residents are reminded that it only takes one hurricane making landfall to make it an active season for them. They should prepare the same for every season, regardless of how much activity is predicted.”

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The signal I started talking about earlier in the week is growing. As you can see below, I think it’s fair to say the environment will be favorable especially the latter portion of next week.

Two areas to watch IMO

1) The western Caribbean/Bay of Campeche—this is far and away the prime zone as a CAG develops and shear drops off next week. High likelihood something pops here. 

2) SE US Coast—the likelihood is much lower here given the lack of warm SSTs at the moment but as a font sinks down next week there could be something subtropical or weak tropical that pops along that area of focus. 12z GFS hints at it and both the GEFS/EPS have some low probabilities there.

ckw8gv6.png

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Tropical Weather Outlook
NWS National Hurricane Center Miami FL
800 PM EDT Sun Jun 6 2021

For the North Atlantic...Caribbean Sea and the Gulf of Mexico:

1. An area of low pressure is expected to develop over the southwestern 
Caribbean Sea by Thursday or Friday.  Some gradual development will 
be possible thereafter as the system moves slowly northwestward 
toward Central America.
* Formation chance through 48 hours...low...near 0 percent.
* Formation chance through 5 days...low...20 percent.

Forecaster Stewart

 

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Been talking about it for a long time, but now it looks like development will be focused in the BoC

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
800 AM EDT Sat Jun 12 2021

For the North Atlantic...Caribbean Sea and the Gulf of Mexico:

1. An area of cloudiness and showers has developed over the Bay of 
Campeche and the adjacent land areas.  Slow development of this 
system is possible over the next several days as it moves slowly 
and erratically, and a tropical depression could form in this area 
by the middle of next week.  Due to the slow motion, regardless of 
development, heavy rainfall is possible over portions of Central 
America and southern Mexico.  Please consult products from your 
local meteorological service for more information.
* Formation chance through 48 hours...low...10 percent.
* Formation chance through 5 days...medium...40 percent.

Forecaster Beven/Latto
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