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 37 38 39 40 41 42 43 44 45 46 47 48 49 50
000
ACUS01 KWNS 211928
SWODY1
SPC AC 211927

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0127 PM CST SUN DEC 21 2014

VALID 212000Z - 221200Z

...NO SVR TSTM AREAS FORECAST...

...SUMMARY...
NUMEROUS SHOWERS AND POSSIBLY A FEW THUNDERSTORMS WILL OCCUR OVER
PARTS OF FLORIDA AND SOUTHEAST GEORGIA THROUGH EARLY MONDAY.

...DISCUSSION...
NO APPRECIABLE CHANGES NECESSARY THIS OUTLOOK. PLEASE SEE PREVIOUS
DISCUSSION BELOW.

..GRAMS.. 12/21/2014

.PREV DISCUSSION... /ISSUED 1015 AM CST SUN DEC 21 2014/

...SYNOPTIC SETUP...
PATTERN WILL AMPLIFY OVER THE CONUS THROUGH MON AS STRONG JET STREAK
THAT TOPPED E PACIFIC RIDGE YESTERDAY CONTINUES E/SE ACROSS THE
RCKYS...RESULTING IN A BROAD TROUGH OVER THE PLNS AND REBOUNDING OF
THE RIDGE N TOWARD THE BC CST. ON THE DOWNSTREAM SIDE OF THE
TROUGH...A SERIES OF LOW-AMPLITUDE DISTURBANCES WILL MODULATE
STRENGTH/LOCATION OF MOISTENING SWLY LOW-LVL FLOW ACROSS THE NRN
GULF OF MEXICO AND ADJACENT SERN U.S. THE ERN PART OF WEAK FRONT NOW
EXTENDING FROM THE CNTRL GULF ENE TO OFF THE NC CST SHOULD EDGE
SLOWLY N ACROSS THE WRN ATLANTIC THIS PERIOD...WHILE THE REMAINDER
OF THE BOUNDARY REMAINS MORE OR LESS STNRY OVER FL AND THE ERN GULF.


...SERN U.S. THROUGH EARLY MON...
ISOLD TO WDLY SCTD TSTMS SHOULD PERSIST THROUGH MON IN BROAD SWATH
OF SHALLOWER CONVECTION N OF STALLED SFC FRONT FROM THE CNTRL GULF
ENE TO OFF THE CAROLINA CST. MODEST MID-LVL LAPSE RATES AND WEAK
LARGE-SCALE FORCING FOR ASCENT WILL LIMIT UPDRAFT STRENGTH AND
DEPTH...WITH FCST SOUNDINGS SUGGESTING ELEVATED MUCAPE REMAINING
MAINLY AOB 500 J/KG. A WEAKLY ORGANIZED CLUSTER OF SHOWERS/STORMS
MAY...HOWEVER...AFFECT W CNTRL PARTS OF THE FL PENINSULA TNGT/EARLY
MON...WHERE THE MOST SUBSTANTIAL MOISTURE /PW TO 2 INCHES/ AND
GREATEST LOW-LVL CONFLUENCE IS LIKELY TO EXIST AHEAD OF UPR IMPULSE
NOW OVER THE NWRN GULF.




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