Severe Storm Outlook Narrative (AC)
Issued by NWS

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
ACUS01 KWNS 220445
SPC AC 220443

Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1043 PM CST Tue Nov 21 2017

Valid 221200Z - 231200Z


An isolated thunderstorm will be possible on Wednesday across south
Florida, with additional thunderstorm chances late Wednesday night
across the Florida Big Bend. Severe weather is not expected with
either scenario.


An amplified mid-level pattern will persist across the United States
on Wednesday, with mean ridging across the West and mean troughing
across the East. The axis of mean troughing will result in broad
southwest flow stretching from the Florida Peninsula to the eastern
Canadian provinces. Embedded within this flow, one mid-level trough
will quickly lift northward along the east coast, with another
moving over the Gulf of Mexico.

Given the broad southwest flow atop a warm, moist boundary layer, an
isolated thunderstorm may develop across south Florida during the
day on Wednesday. Despite sufficient mid-upper-level shear profiles,
modest low-level flow should preclude a severe risk. Additionally,
thunderstorms should develop/continue across the Gulf of Mexico
through most of the day as the mid-level trough slowly moves east.
These thunderstorms should begin to approach the Florida Big Bend by
late Wednesday night and early Thursday morning.

..Marsh.. 11/22/2017

$$ is the U.S. government's official web portal to all federal, state and local government web resources and services.