Talking the Tropics With Mike: Weak low pressure over SW Atlantic through weekend

Significant tropical development unlikely but something to keep an eye on

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A weak/pesky old frontal boundary is stretched out across the W. Atlantic to S. Carolina & Georgia & will be reinforced somewhat by a weak piece of an upper level trough that will evolve over the Southeast/Eastern U.S. Numerous t’storms should develop with this feature through Fri. across Ga./Fl. & the Western Atlantic with weak low pressure forecast to develop a little east of Fl. &/or Ga. Conditions are not particularly favorable for much development but close proximity to the Gulf Stream is a bit disconcerting. The low pressure is not likely to move much through most of the weekend with most of the t’storm activity eventually evolving over the eastern part of the circulation - east of the Carolina’s/Ga./Fl. while dry air is drawn southward on the low’s backside. This *appears* to end up more of an elongated trough vs. significant low pressure, but we’ll have to keep an eye on any t’storm clusters that might persist & result in a potentially stronger surface circulation. Early indications are that the low &/or trough would eventually get pulled northeast by early next week but - at the same time - an upper level ridge will be trying to build eastward across the U.S. so much will depend on (1) any low pressure developing & (2) the timing/positioning of the upper level ridge.


Saharan dust. Dry air - yellow/orange/red/pink - is extensive over the Caribbean & Central & Eastern Atlantic. Such widespread dust is common early in the hurricane season - through July - & is indicative of dry air that can impede the development of tropical cyclones. However, sometimes “wanna’ be” waves will just wait until they get to the other side of the plume then try to develop if everything else happens to be favorable.

2021 names..... “Fred” is the next name on the Atlantic list (names are picked at random by the World Meteorological Organization... repeat every 6 years... historic storms are retired (Florence & Michael in ’18... Dorian in ’19 & Laura, Eta & Iota in ‘20). Last year - 2020 - had a record 30 named storms. The WMO decided beginning in 2021 that the Greek alphabet will be no longer used & instead there will be a supplemental list of names if the first list is exhausted (has only happened twice - 2005 & 2020). More on the history of naming tropical cyclones * here *.

East Atlantic:


Mid & upper level wind shear (enemy of tropical cyclones) analysis (CIMMS). The red lines indicate strong shear which is widespread from the Gulf of Mexico & Caribbean eastward across much of the Atlantic:

Water vapor imagery (dark blue indicates dry air):

Deep oceanic heat content is slowly increasing across the SE Gulf, Caribbean & deep tropical Atlantic:

Sea surface temp. anomalies:

SE U.S. surface map:

Surface analysis centered on the tropical Atlantic:

Surface analysis of the Gulf:

Caribbean:

Atlantic Basin wave forecast for 24, 48 & 72 hours respectively:

The E. Pacific has gone quiet now....

In the W. Pacific.... broad-eyed typhoon “In-Fa” is forecast to turn more northwest with minimal impact on Northern Taiwan by late week/this weekend while staying well south & west of Japan.


Global tropical activity:



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