Severe Storm Outlook Narrative (AC)
Issued by NWS

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ACUS03 KWNS 060828
SWODY3
SPC AC 060827

DAY 3 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0227 AM CST TUE DEC 06 2016

VALID 081200Z - 091200Z

...NO SVR TSTM AREAS FORECAST...

...SUMMARY...
THE GREATEST POTENTIAL FOR THUNDERSTORMS THURSDAY INTO THURSDAY
NIGHT SHOULD BE ACROSS SOUTH FLORIDA...WHILE A STRIKE OR TWO CANNOT
BE RULED OUT IN LEE OF THE GREAT LAKES ATTENDANT TO LAKE EFFECT
SNOW.  SEVERE STORMS ARE NOT EXPECTED ACROSS THE CONTIGUOUS UNITED
STATES.

...SYNOPSIS...
A LONGWAVE TROUGH WILL SHIFT EASTWARD INTO THE EASTERN HALF OF THE
COUNTRY...WHILE AN UPSTREAM BROAD...LOW-AMPLITUDE RIDGE ADVANCES
INLAND ACROSS THE WESTERN STATES.  AT THE SURFACE...THE LARGE ARCTIC
ANTICYCLONE WILL SPREAD ACROSS MUCH OF THE EASTERN U.S. FROM THE
OHIO VALLEY AND CENTRAL APPALACHIANS SOUTHWARD THROUGH ATLANTIC
SEABOARD AND THE GULF OF MEXICO.

...SOUTH FLORIDA...
THE COLD FRONT ON THE LEADING EXTENT OF THE ARCTIC ANTICYCLONE WILL
SPREAD SOUTH THROUGH THE FLORIDA PENINSULA THIS FORECAST PERIOD.
FORECAST SOUNDINGS SUGGEST INSTABILITY...THOUGH GENERALLY MARGINAL...
SHOULD SUPPORT A FEW THUNDERSTORMS NEAR A STALLED FRONT AND AS THE
COLD FRONT MOVES THROUGH SOUTH FLORIDA THURSDAY EVENING.

...LEE OF THE GREAT LAKES...
COLD LOWER-TROPOSPHERIC AIR SPREADING ACROSS THE RELATIVELY WARM
LAKE TEMPERATURES WILL RESULT IN STEEPENING 0-3-KM LAPSE RATES TO
SUPPORT SUFFICIENT INSTABILITY FOR LIGHTNING OVER AND IN LEE OF THE
GREAT LAKES.  HOWEVER...GUIDANCE SUGGESTS THUNDERSTORM COVERAGE
SHOULD REMAIN LESS THAN 10 PERCENT...PRECLUDING THE INCLUSION OF A
CATEGORICAL GENERAL-THUNDERSTORM AREA.

..PETERS.. 12/06/2016

$$



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