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LU9DCE > ALERT 16.09.20 19:00z 100 Lines 5107 Bytes #999 (0) @ WW
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Subj: STORM PREDICTION CENTER 16 09
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Sent: 200916/1800Z 25741@LU9DCE.TOR.BA.ARG.SOAM LinBPQ6.0.20
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ESTACION DE PACKET RADIO - BUENOS AIRES (GF05OM)
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WW 491 TORNADO AL FL GA CW 161050Z - 162300Z
URGENT - IMMEDIATE BROADCAST REQUESTED Tornado Watch Number 491
NWS Storm Prediction Center Norman OK 550 AM CDT Wed Sep 16 2020
The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of Southern Alabama Florida Panhandle
Southwestern Georgia Coastal Waters
* Effective this Wednesday morning and evening from 550 AM until
600 PM CDT.
* Primary threats include... A few tornadoes possible
SUMMARY...With landfalling Hurricane Sally forecast by the National
Hurricane Center to turn northeastward today after moving slowly
inland, the favorable sector for tornadoes should both spread
inland toward southeastern Alabama, and expand eastward gradually
through more of the Florida Panhandle and into southwestern Georgia
by afternoon.
The tornado watch area is approximately along and 60 statute miles
north and south of a line from 15 miles northwest of Pensacola
FL to 20 miles east northeast of Tallahassee FL. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU1).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A Tornado Watch means conditions are favorable
for tornadoes and severe thunderstorms in and close to the
watch area. Persons in these areas should be on the lookout for
threatening weather conditions and listen for later statements and
possible warnings.
&&
OTHER WATCH INFORMATION...This tornado watch replaces tornado watch
number 490. Watch number 490 will not be in effect after 550 AM CDT.
AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 0 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 16045.
...Edwards
WW 0491 Status Updates
STATUS FOR WATCH 0491 HAS NOT BEEN ISSUED YET
SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0733
AM CDT Wed Sep 16 2020
Valid 161300Z - 171200Z
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER PARTS OF THE
FLORIDA PANHANDLE...NORTHWESTERN FLORIDA...SOUTHEASTERN ALABAMA...AND
SOUTHERN GEORGIA...
...SUMMARY... As Hurricane Sally moves further inland, it may
produce a few tornadoes over parts of the Florida Panhandle,
northwestern Florida, southeastern Alabama, and southern Georgia
through tomorrow morning.
...Synopsis... In mid/upper levels, an elongated cyclone over
the northeast Pacific will move slowly eastward, causing height
falls across parts of the Pacific Northwest. Downstream, and
past a prominent upper ridge over the northern Rockies, the
northern-stream cyclonic-flow field across the Great Lakes and
vicinity will amplify with height falls. This will occur as a
strong cyclone digs southeastward across Hudson Bay.
Meanwhile, a weak but extensive area of troughing will move slowly
southeastward across the Mid-South, southern Plains and northern MX.
These processes will encourage recurvature of what now is Hurricane
Sally northeastward across AL toward western GA through the period,
per NHC forecast. See NHC advisories for the latest track/intensity
guidance on Sally as the cyclone proceeds deeper inland.
...Southeast... See SPC tornado watch 491 and related mesoscale
discussions for near-term tornado threat with Hurricane Sally.
The center of this hurricane made landfall near Gulf Shores, AL,
around 1045Z, and is forecast by NHC to turn northeastward and
accelerate (while still moving slowly) across southern AL.
As that occurs, a favorable sector of the eastern semicircle --
south of a persistent/stabilizing precip shield -- will spread/
expand inland and also eastward, in step with that component of
Sally's translational vector. Some expansion of the supercell-
supporting wind fields just above the surface also is possible
tonight as inland decay of the strongest core winds proceeds, with
system-relative radial spread of enlarged low-level shear/hodographs
into more of the eastern semicircle, and across southern GA and
perhaps northwestern FL. Rich inflow-layer moisture and low LCLs
are a given. The main limiting factor will be buoyancy, though
with sustained favorable inflow off the Gulf amidst a more-southerly
surface wind component, advecting greater theta-e inland across the
FL Panhandle/I-10 corridor today and into portions of southern GA
from late afternoon onward.
..Edwards/Broyles.. 09/16/2020
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Un tonto sabio es mas tonto que un tonto ignorante.
-- Moliere. (1622-1673) Dramaturgo frances.
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