Atlantic not as busy as it looks (4 Aug 2025)

Overnight the National Hurricane Center (NHC) started advisories on Tropical Storm Dexter. It is just a stretched out blob of clouds on IR:

Infrared satellite image of Tropical Storm Dexter, showing distinct cloud formations with varying brightness temperatures.

There are no “Key Messages” on Dexter, which is your first clue that it is of interest only to fish and mariners. It might cause some waves and rip currents along the East Coast. Here’s the forecast impact swath …

Map showing the forecast impact swath for Tropical Storm Dexter, with tracking lines and projected classifications, overlaid on a geographic view of the eastern United States and the Atlantic Ocean.

Although the multiple blobs and, now, a named storm have been met with screams of glee from the click-bait community, there’s really nothing much to get excited about.

Satellite image showing the NHC Tropical Weather Outlook, including areas of interest for Tropical Storm Dexter with percentages indicating the likelihood of development.

It’s August, so naturally tropical activity in the Atlantic is headed towards the normal peak in mid September. Things still are not favorable, although “improving” from the perspective of storm development. Here is the wind shear map this morning …

Satellite image showing a wind shear map of the Atlantic Ocean region, with color-coded areas indicating varying levels of wind shear affecting tropical storm activity.

As you can see, the area Dexter is moving in to (indicated with the colored contours) will shred up anything moving that way. The central Atlantic isn’t all that great either but better than it was. It’s still very dry out there in the middle layers of the Atmosphere, indicated in brown in this image … but again improving.

Satellite image showing the path of Tropical Storm Dexter over the ocean, with cloud patterns and storm trajectory indicated.

The YBOD (Yellow Blob of Doom) off of Frogmore is interesting. Unlike Dexter, indications are the system that is hung up over the region will slowly drive west or northwest on to land. It’s possible it will develop tropical characteristics, and it means this week will be rainy with thunderstorms, but it’s not likely that it has much chance of becoming anything dangerous, just inconvenient, with the normal potential for flash flooding we have anytime there is a heavy downpour from a thunderstorm. There is a lot of moisture over the region (white areas in this view):

Satellite image showing cloud cover over the southeastern United States, with a focus on the Gulf Coast region.

So worth being careful around the areas that typically flood during heavier rain events, especially streets and if there happens to be a downpour around high tides. Here’s the HRRR radar forecast for today …

Radar image showing precipitation patterns along the East Coast, indicating areas of heavy rainfall near the shore.
HRRR Forecast run at 5am.

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