Tropical Update: Atlantic Still Extremely Active

Figure 1. IR satellite image of Hurricane Jerry as from 5:35 PM EDT/AST September 19, 2019. Image: Tropical Tidbits

The Weather Prediction Center is still issuing advisories on Tropical Depression Imelda, and was centered about 55 miles northeast of Houston, Texas as of the most recent advisory.

Forecast for Imelda

Imelda will finally move out of Texas Friday, and the risk for heavy rain and flash flooding will diminish tonight/Friday.

Jerry

A hurricane hunter aircraft found Jerry had intensified to a hurricane this morning.

As of 5 PM EDT/AST, maximum sustained wind were 90 mph, the minimum central pressure was 979 mb, and movement was west-northwest at 17 mph.

Figure 2. Forecast track from the National Hurricane Center for Jerry as of 5 PM EDT/AST September 19, 2019.

Additional strengthening is likely over the next 12 – 24 hours.

An increase in shear is expected overnight, though, and should halt intensification and cause some weakening; however, a bit of re-intensification is possible early next week.

Jerry will pass north of the Caribbean this weekend, and curve out into the Atlantic next week.

Elsewhere in the Atlantic

There are now three other disturbances to keep an eye on (see figure 3): a tropical wave in the Caribbean, another in the Main Development Region (MDR), and one that has yet to emerge off Africa.

Figure 3. Five-Day Graphical Tropical Weather Outlook from the National Hurricane Center as of 2 PM EDT September 19, 2019.

The Caribbean disturbance is still not likely to amount to much. However, it does look like it will end up in the Gulf early next week, so it is worth keeping an eye on.

The disturbance in the MDR still has some potential to develop this weekend/early next week on approach to the Caribbean.

However, model support for development has decreased, with the GFS now being the only model predicting tropical cyclone (TC) formation as of the 12z model cycle (see figure 4).

Figure 4. GFS showing a tropical depression/storm approaching the Windward Islands Saturday. Image: Tropical Tidbits

In their 2 PM EDT Tropical Weather Outlook (TWO), the NHC kept the 5-day chance of development at 30 percent.

Should a TC form, it still doesn’t look like it will be a U.S. threat.

The wave still over Africa will be one to really watch.

The ECMWF, UKMET and GFS are in unanimous agreement on TC genesis over the MDR this weekend/early next week, with the most recent runs of the ECMWF and GFS both fairly aggressive, showing a hurricane.

In their 2 PM EDT TWO, the NHC put the 5-day development chance at 40 percent.

If this wave does develop, which is looking likely at this point, it is too early to say if it will pose a threat to the U.S. or Caribbean.

Caleb Carmichael
Caleb Carmichael

Caleb is the owner of Gulf Coast Storm Center. He is currently an undergraduate student at Mississippi State University majoring in geoscience with a concentration in broadcast and operational meteorology. While not yet a meteorologist, Caleb has been providing weather updates, news, and analysis for the Gulf Coast since 2014.

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