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
000
ACUS01 KWNS 180515
SWODY1
SPC AC 180514

Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1114 PM CST Sun Dec 17 2017

Valid 181200Z - 191200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Isolated to scattered thunderstorms are expected from Texas eastward
across portions of the Gulf Coast states today and tonight.

...Synopsis...
A split in the flow field aloft will prevail over the U.S. today, as
fast/low-amplitude westerlies persist over the northern half of the
U.S., while an upper low cut-off from the westerlies farther north
drifts slowly eastward along the southwestern U.S./Mexico border.

Weak ridging aloft will prevail over the southeast U.S. ahead of the
slowly advancing upper system, but weak disturbances moving through
the anticyclonic flow field should allow convection -- ongoing at
the start of the period -- to continue through the day over the Gulf
Coast region.

Farther west, a gradual increase in isentropic ascent across Texas
ahead of the upper low should support an increase in potential for
showers and embedded/elevated thunderstorms through the second half
of the period.  However, weak instability in all areas should
preclude any appreciable severe potential.

..Goss/Leitman.. 12/18/2017

$$



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