Yellow X Over NC - Development Near OBX? 10 - 20% Chances Something Could Develop. Questions on Cool Water By Africa in the East Atlantic and Why You Shouldn't Really Care. Makes Great Click Bait and a Researcher's Dream But Close In Hurricanes Could Happen in 2018. Despite the Headlines Waves Keep Rolling Off of Africa. Come September We Need to Remember Climo Usually Wins.

Woke up this morning to the site of a Yellow X on the NHC 2 Day map just to the West of me. I always joke that Greensboro gets more weather than Raleigh and obviously that includes yellow 10% areas of possible development from the NHC.  Some models spin this up and spit it out into the Atlantic where it moves in Derecho manner across the open water zooming out to sea. Some models do have it following the warmth of the Gulf stream close up the coast but off the coast sucking in as much energy (available heat from warm water close in) and sliding up towards the banks of Newfoundland. The EURO is more bullish on this system than the GFS that does not see anything of consequence evolving. Remember that as it will be interesting to see which model read this set up better than the other. Well, interesting for those of you who find that interesting ;) 

So let's look at the models.

Using the 850 mb relative vorticity version here of Euro model to try and show the exact "center" of this possible tropical disturbance I'm showing three images below. Again, it is not currently tropical but it may present itself as tropical later in the forecast period. Confusing I know but it's the only real show in town so going to explain it as best as I can in a simplistic way. The orange splotch over NC is the yellow X with 10% chances over North Carolina.

It then shoots it out near OBX into the Atlantic.

Kind of like spitting out a watermelon seed...

It's on it's way the next day.

Fast moving blip.

Could it attain TD status?

Possibly.

Water there is warm.

Remember this map above for later discussion.

For our purposes today there is warm water there.

It has a very narrow window to develop.

Sustainability is a big word used often these days in other arenas of discussion, but going to use that word here today in relation to tropical development as water needs to be warm enough to sustain tropical development. Kind of that simple. It also needs low shear that will not interfere with development.  If you have a well developed low pressure area move over the warm waters off of the Carolinas where there is low shear it has a window where it could develop into a more truly tropical system. 

There is something about the way these low pressure systems over land and how they evolve as they hit the warm water that sometimes spins up a named storm. This is a perfect example of how a set up can produce a tropical system given the right circumstances. And, this is why I am more worried about the water temperatures close in to the coast on our side of the world in June and July than I am about the water temperature near Africa that is historically still cold this time of year. Again, sustainability is a factor and evolution is the process that can make a difference when it comes to Homegrown Tropical Systems. The set up is not ideal, but it is there enough to warrant the low numbers given it from the NHC; that being 10% in the next two days and 20% in the next five days. 

Perhaps the GFS feels there is too much shear there?

Currently today there is severe weather on the maps.

Watches and warnings up from NWS.

Live News feed on Twitter.

There are three points to take away from this blog today. The first is that we currently have a "Yellow X with 20%" chances on the NHC map for a possible, fast forming, fast moving system that could take on tropical characteristics. Many are asking if this could be Beryl, other's see a Tropical Low or Tropical Depression while others see nothing of significance forming or to talk about. Time will tell who is right, but Dabuh watches the surf along with the weather so anything that brings the surf on is of significance to him.

 Two the over concern with the cool water temperatures out near Africa in late June is a matter of Academic significance and scientific discovery.  It matters little how cool or hot the water in the East Atlantic is if you live in coastal towns that have a history of home grown development close in giving little warning time before landfall and making huge coastal impacts. Over the very warm waters of the GOM or Florida hot water and low shear close in can be the best set up available for rapid intensification of a developing tropical system. Watch how fast Wilma intensified just off shore of the Yucatan and one can only imagine what it would be like to have had satellite imagery of the Labor Day Hurricane that formed in the Bahamas in 1935.

When we talk about ACE it is basically the sum total of the intensity of the hurricane season as a whole. That often includes intense hurricanes that form in warm pools of water in the Eastern Atlantic early on and far away that tend to turn NW out into open waters becoming beautiful ocean spinners. They are also beautiful in that they spare the East Coast and the Islands direct hits such as last year's Hall of Fame winners Maria and Irma. There are years where ACE is high and hurricanes happen everywhere yet make landfall nowhere. Those are golden years for hurricane researchers to learn more about the various stages of development and steering conditions that impact hurricanes. However they often stay far away from land, yet oddly years with overall low ACE can present dangers close in that leave their imprint on the coastal towns for years and the list of those storms is long. So yes on one level we will (in theory) have less long tracking CV Hurricanes moving WNW slowly at 15 MPH giving us photogenic images of true Atlantic Hurricanes. On the other hand it means nothing as to what the chances are for landfalling hurricanes in Florida, South Carolina, North Carolina or the Mid Atlantic States in the same places slammed by Hurricane Sandy that came up out of the Caribbean, across Cuba and surfed her way North over the very warm Gulfstream. A look at 1985 is another excellent example of just this sort of problematic years where hurricanes made landfall often yet most formed close in and few formed near Africa. The Southwest Carib was mostly shut down as this year could be as well as shear there is high. Two systems formed out near Africa and made it across, yet many formed closer in and there was a traffic jam of landfalling hurricanes.

Ask anyone who went through Gloria....

...how memorable 1985 was.

Keep in mind Gloria formed in the heart of the season.

When water by Africa is at it's warmest.

Gloria formed September 16th.

Climo almost always wins.

It's really not about quantity but quality.

Thankfully it could lessen the danger to the Caribbean.

Cooler waters by Africa means less early hurricanes.

The Islands are rebuilding slowly.

Florida is covered with blue tarps still.

They can use a break in tropical action.

But it means little to the the SE, GOM or NE.

Look at the map below.

June, July and August are about W of 55 Degrees.

Usually, most years.

Note the comment below:

Chick knows Carolina weather.

Again ACE is an academic term and we love to throw it about online and use it as a measure for how "active" a Hurricane Season may be or how busy it was in retrospect; it also makes great headlines and click bait in quiet times such as June and July. In real time you need to worry on what may be knocking at your door after rapidly developing close in the way Andrew did after wheezing it's way across the Atlantic constantly in danger of having the NHC pull the plug only to blow up in waters closer to the coast the same way the Labor Day Hurricane did in 1935. There was NO Ace until late August in 1992 when Andrew developed, yet we spent years rebuilding in South Florida after Andrew. 

Yesterday Allan Huffman posted his thoughts on this topic of water temperatures being below normal close to Africa, yet pointing out that the cool water pool of water ends at 55 degrees West. Is the cup half full or half empty? There are two ways to look at every question and we need to not let our guard down about the 2018 Hurricane Season that will hopefully, thankfully not be as active as 2017.

Watch the discussion that followed.

If you are not on Twitter...

...you should be.

With all it's annoyances....

...Twitter is a great place for real time discussion.

Rob from www.crownweather.com is 100% correct and people need to not let their guard down because there is a current anomaly of cold water near Africa as it doesn't mean that the danger of hurricanes forming close in (especially in this particular year I'll add) do not pose a serious threat and people need to prepare properly for the 2018 Atlantic Hurricane Season. It also doesn't mean that come September we will have to remember hurricanes form in the East Atlantic the way Gloria did in 1985. I'll write on this more over the next few days. But it's true and Bastardi mentions it often that no models showed the dramatic decline of warm water in the distant Atlantic and that makes me wonder how good the models really are when it comes to long term forecasting especially with regard to this year. Often they are great, however in swing years as this one may be if the much whispered El Nino develops, but some years have contrasting signals and their own unique problems so I beg you to take this year and every year seriously and do what you do need to do to get a hurricane plan set up for how you would deal with a landfalling hurricane or very, slow moving strong Tropical Storm that may dump copious amounts of rain and slam your area with tornadoes. Let's leave the scientific terms used for evaluating a season to the academics and the researchers and prepare as if this is the year that Andrew or Gloria is going to come knocking on your door!

https://www.nhc.noaa.gov/prepare/ready.php?elq=996f8a8301544a6f9a72e6ca07b89d7e

Oh and #3 .... despite cool pools of water by Africa and high levels of Saharan Dust the waves over Africa keep on coming. The last one, the newest one earned a purple splotch on the maps we watch to see where development could happen. A little smirk there yesterday on that last wave. The one behind the smirky one has quite the structure, however it's going to plop down in mighty cold water way too early to expect development just yet.

Besos BobbiStorm

@bobbistorm on Twitter.

If you are wondering how I am dealing with a Yellow X over my head... I made a tropical breakfast of Avocado Toast and Mango Slices ;) A girls got to do what a girl's got to do . . . and am loving the cooler weather on the balcony listening to the excited birds singing while waiting on the rain to fall.