Sand bars to the left should be noted in relation to the bridge. (click here) These are sandbars in the Oregon Inlet of North Carolina. Not all sand bars are that noticeable.
What is occurring with Hurricane Dorian is the removal of sand from the beach. The sand has to go somewhere and it is deposited offshore in deep water in the ocean. The sand deposits are normally irretrievable. What occurs when recovery from the hurricane takes place is beach renourishment/replenishment. It is probably classified as "construction, but, it is done with sand. It is somewhat complicated, especially when contending with an ocean, but, there are methods that literally put the beach back in place. It is also very expensive to these communities. But, they value tourism and their residents, so the price is paid. Let's face it, the next hurricane will at least have a beach to erode rather than making landmass disappear and ultimately causing a change in geography.
There are measures to prevent beach erosion such as planting beach grasses and placing snow fencing to prevent loss of the dunes. The dunes sincerely do protect the beach and help reduce loss.
Beach erosion (click here) occurs when waves and currents remove sand from the beach system. The loss of sand causes the beach to become narrower and lower in elevation (Figure 1). Storm waves carry the sand offshore, depositing and storing the sediment in large sandbars. In weeks and months following the storm, the sand is returned to the beach by calm-weather waves. Because many states rely on beach-related tourism as a major source of revenue, beach erosion has become a serious concern for coastal counties throughout the United States. Beach erosion also threatens coastal properties and infrastructure, such as roads, homes, and businesses. A series of storms can cause significant retreat of the shoreline, leaving coastal property more vulnerable to future storms (Figure 2).
This is from a website called "Windy.com." (click here) I tried to find where the creators explain who they are, but, the site claims to advise those sports minded interested in wind, including surfers.
I did compare the map to others and it looks reasonable. Basically, Dorian is a very powerful storm with a dominance of air movement throughout the Gulf of Mexico as well. The land temperature is completely compensated from the colder air and has returned to high temperatures again.
Dorian has stalled and harnessed the entire air mass over the Gulf of Mexico; ie: this map in motion at link above. There is plenty of fuel and nothing countering it. The Gulf is hot. The air is circulating across the Gulf and a portion is returning to Dorian's circulation.
People need to follow the recommendations of their local authorities. No exceptions. Stagnant hurricanes repeatedly assault infrastructure, over and over with their winds, rains and flooding. Infrastructure is not predictable with such forces acting on it. Listen to the local authorities. No one can predict how long stressed infrastructure will sustain it's usefulness.
When I took a closer look at this USA temperature map, it appears to be heat transfer. In other words, when the cold air descended from Canada it cooled the hot air mass over the country.
Depending on the heat of the air; the colder air would cool that air unevenly. A city is hotter than a grassy field. The same cold air would pass over both and cause a different fall in temperature. It would not be uniform throughout.
I hadn't watched the Canadian air mass closely, but, since the hurricane wouldn't let it into the southeast it went into Mexico.
That is the way I see it at this point. There have been hurricanes into the Eastern Pacific that could also be cooling Mexico as well.
September 2, 2019
0200
Temperature map of USA
Is everyone sure this hurricane is going to turn?
This has to be the strangest temperature map I've seen. There is a cold air mass converging in the area of the storm.
NOAA Water Vapor - IR High Level Satellite
September 2, 2019
0716z
There is a very clear cold front moving down and east southeast.
NOAA Water Vapor - IR Mid-Level Satellite
September 2, 2019
0716z
The same cold front is descending in the Mid-level satellite.
NOAA Water Vapor - IR Low Level Satellite
September 2, 2019
0716z
That front is there throughout all levels. It is most likely why it is stalled, but, with it moving east - southeast and questionably sending Dorian into the Gulf across Florida.
The warnings need to continue, but, at this point the path is still more than concerning. At least it is to me.
This storm is deadly. Everyone. I mean everyone needs to get out of the way.
