Tropical Storm Lisa Discussion Number 4
NWS National Hurricane Center Miami FL AL152022
1100 AM EDT Mon Oct 31 2022
GOES-16 1-minute visible imagery indicates that the low-level
circulation of the system has closed off again, although the system
is still a bit elongated north-to-south. Westerly shear has caused
the center to be exposed to the west and north of the primary
convective banding features. NOAA Hurricane Hunter tail Doppler
radar data also show that the low is tilted southeastward with
height, a reflection of the current shear. Still, the plane had
numerous SFMR values of around 35 kt, and dropsonde data showed the
pressure has dropped to 1003 mb. These values are sufficient to
call the system a tropical storm with an initial wind speed of 35
kt.
After a dip southward overnight, Lisa is moving westward again at
about 12 kt. The storm should move westward to west-northwestward
for the next day or two under a mid-level ridge to the north. As
the ridge intensifies in a few days, Lisa is likely to move
westward, or possibly a little south-of-west, while it approaches
Belize. Model guidance remains in very good agreement, and
only a small southward adjustment was made to the previous forecast.
Lisa should encounter more conducive atmospheric and oceanic
conditions for the next few days, with increasing mid-level
humidities and generally lower shear. The storm will likely still
have some bouts with drier air infiltrating in the northwestern
quadrant of the circulation, but the diminishing shear should lessen
the impact of this factor. Thus slow intensification is shown for
the next few days, consistent with the interpolated previous
forecast. It should be noted that the new NHC forecast is on the
high side of the guidance for this cycle, with a notable decrease of
the forecast intensity in many of the models. The official
forecast is lower than the previous one, owing to the model trend,
but it is preferable to wait another cycle to make any larger
changes after the model suite ingests the plentiful aircraft data
for the 12 UTC suite.
Key Messages:
1. Tropical storm conditions are possible on Jamaica today.
2. Interests along the coast of Central America, especially near
Belize and the Yucatan Peninsula of Mexico, should monitor the
progress of this system. Additional watches and warnings will
likely be required by late today.
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