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 270600
SWODY1
SPC AC 270559

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1259 AM CDT FRI MAR 27 2015

VALID 271200Z - 281200Z

...THERE IS A MRGL RISK OF SVR TSTMS ACROSS CENTRAL AND SRN FL...

...SUMMARY...
ISOLATED STRONG THUNDERSTORMS ARE POSSIBLE ACROSS THE CENTRAL AND
SOUTHERN FLORIDA PENINSULA FRIDAY.

...SYNOPSIS...
A HIGHLY AMPLIFIED FLOW FIELD ALOFT WILL PERSIST ACROSS THE U.S.
FRIDAY...WITH A LARGE TROUGH TO PREVAIL OVER THE W WHILE A TROUGH
MOVES SLOWLY EWD ACROSS THE ERN STATES.  WITHIN THE LARGER-SCALE
FLOW FIELD...A FAST-MOVING SHORT-WAVE TROUGH IS PROGGED TO SHIFT
INLAND ACROSS THE PAC NW AND WEAKEN THE NRN PERIPHERY OF THE LARGER
SCALE RIDGE.  IN THE EAST...CYCLONIC SHORT-WAVE ENERGY IS FORECAST
TO ROTATE ACROSS THE SERN STATES...THROUGH THE BASE OF THE
LARGER-SCALE TROUGH.

AT THE SURFACE...A COLD FRONT EXTENDING FROM OFF THE NEW ENGLAND
COAST SWWD ACROSS THE ERN CAROLINAS/GA/THE FL PANHANDLE AND INTO THE
CENTRAL GULF INITIALLY WILL MAKE STEADY SEWD PROGRESS ACROSS THE
SERN STATES...CLEARING S FL TOWARD THE LATTER STAGES OF THE PERIOD.

...CENTRAL AND SRN FL...
CONVECTION IS FORECAST TO BE ONGOING ACROSS PORTIONS OF THE FL
PENINSULA AT THE START OF THE PERIOD...HINDERING TO SOME DEGREE THE
POTENTIAL FOR HEATING AHEAD OF THE ADVANCING FRONT.  WITH THAT
SAID...SOME INCREASE IN AFTERNOON STORMS IS EXPECTED AS THE COLD
FRONT ADVANCES SEWD ACROSS THE FL PENINSULA...BENEATH STRENGTHENING
SWLY MID-LEVEL FLOW.  THOUGH VEERED BOUNDARY-LAYER FLOW IS EXPECTED
AHEAD OF THE FRONT -- THUS LIMITING RISK FOR LOW-LEVEL ROTATION...A
FEW STRONGER STORMS/CLUSTERS WILL BE POSSIBLE GIVEN FAVORABLE
DEEP-LAYER SHEAR.  THUS...WILL MAINTAIN 5% PROBABILITY TO COVER
POTENTIAL FOR A STRONGER GUST OR TWO INTO THE EARLY EVENING HOURS.

..GOSS/LEITMAN.. 03/27/2015



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