Mesoscale Discussion 1695
NWS Storm Prediction Center Norman OK
0414 AM CDT Wed Sep 16 2020
Areas affected...Florida Panhandle...Far Southern Alabama
Concerning...Tornado Watch 490...
Valid 160914Z - 161115Z
The severe weather threat for Tornado Watch 490 continues.
SUMMARY...A tornado threat will continue through daybreak from far
southern Alabama eastward across the Florida Panhandle into far
southwest Georgia. A new tornado watch will need to be issued before
the 11Z expiration of WW 0489.
DISCUSSION...Hurricane Sally's center is currently about 10 miles to
the south of Gulf Shores, Alabama. The hurricane will continue to
move slowly northward with an expected landfall around 10Z. Bands of
heavy rainfall are present to the north and east of the center
extending eastward about 150 statute miles. The most notable band is
located in Santa Rosa County, Florida extending south-southeastward
into the northeast Gulf of Mexico. Multiple semi-discrete
thunderstorms are ongoing within this band. Other discrete cells are
ongoing over land to the southwest of Tallahassee. Some of the
storms are supercells. The latest WSR-88D VWP at Eglin Air Force
Base shows veering of winds with height in the lowest 3 km above
ground level. This is supporting storm-relative helicity in the 350
to 400 m2/s2 range, which will be favorable for tornadoes associated
with the stronger rotating storms. The tornado threat will be
maintained along the coast through mid morning with some slight
inland shift possible. For this reason, a new tornado watch will
need to be issued by the 11Z expiration of tornado watch 0489.
..Broyles/Edwards.. 09/16/2020
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...TAE...MOB...
LAT...LON 30078442 30498439 30998466 31258523 31278698 31228756
30858786 30568784 30378778 30168755 30298677 30248617
30038576 29638539 29508493 29798447 30078442
Read morefrom SPC Forecast Products http://www.spc.noaa.gov/products/md/md1695.html
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