Skip Navigation Links weather.gov 
NOAA logo-Select to go to the NOAA homepage NOAA's National Weather Service   Select to go to the NWS homepage
Storm Prediction Center
navigation bar left  
  navigation bar end cap


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

Mesoscale Discussion 370
< Previous MD         Next MD >
MD 370 graphic

   MESOSCALE DISCUSSION 0370
   NWS STORM PREDICTION CENTER NORMAN OK
   0456 AM CDT SAT APR 19 2014

   AREAS AFFECTED...PORTIONS S FL.

   CONCERNING...TORNADO WATCH 84...

   VALID 190956Z - 191200Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 84 CONTINUES.

   SUMMARY...LOOSELY ORGANIZED BAND OF STG AND POTENTIALLY SVR TSTMS IS
   MOVING EWD ACROSS S FL -- GENERALLY S OF LAKE OKEECHOBEE AND OVER
   RURAL/EVERGLADES AREAS.  THIS ACTIVITY WILL POSE SPORADIC SVR THREAT
   AS IT CROSSES REMAINDER S FL THROUGH MIDMORNING.  MORE ISOLATED STG
   CELLS WILL PROCEED EWD OVER ST LUCIE/INDIAN RIVER COUNTIES...PART OF
   OTHERWISE WEAKENING CONVECTIVE BAND EXTENDING SWWD BEHIND MAIN TSTM
   CORRIDOR.

   DISCUSSION...MAIN BAND OF TSTMS IS MOVING EWD 20-25 KT INTO WRN
   FRINGES PALM BEACH/BROWARD/MIAMI-DADE COUNTIES AND WILL CROSS
   METRO/I-95 CORRIDOR DURING NEXT 2-3 HOURS...WHILE ADDITIONAL
   CONVECTION MOVES/BUILDS NEWD ACROSS PORTIONS MIA/FLL METRO AREA. 
   OCNL BOW/LEWP FEATURES WITH ENHANCED OUTFLOW POOLS HAVE BEEN
   DETECTED VIA MFL/88D AND MIA TDWR IN WESTERN CONVECTION...AND
   ADDITIONAL DOWNDRAFT SURGES RELATED TO PRECIP LOADING MAY OCCUR THAT
   ARE CAPABLE OF LOCALIZED WIND DAMAGE.  BOOKEND MESOVORTICES -- OF
   WHICH A FEW WEAK SPECIMENS ALREADY HAVE BEEN INDICATED FROM SRN LAKE
   OKEECHOBEE SWWD -- AND LEADING-EDGE QLCS CIRCULATIONS ALSO ARE
   POSSIBLE AND APPEAR TO CONSTITUTE BULK OF MRGL TORNADO THREAT FROM
   HERE ON.  

   SFC DEW POINTS 70S F AND WEAK CINH SUPPORT ESSENTIALLY UNINHIBITED
   PRECONVECTIVE MLCAPE AROUND 1500 J/KG.  AS SUCH...MORE DEVELOPMENT
   MAY OCCUR AHEAD OF MAIN BAND.  40-50 KT EFFECTIVE SHEAR MAGNITUDES
   AND OBSERVED/LOCALIZED BACKING/CONVERGENCE OF FLOW ALONG IMMEDIATE E
   COAST SUGGEST SUPERCELL THREAT IS NOT YET OVER.  SUPERCELLS
   THEREFORE ARE STILL POSSIBLE...BUT APPEAR TO BE GETTING LESS LIKELY
   WITH TIME PAST SUNRISE AS TWO FACTORS PLAY IN...
   1. PREDOMINANCE OF MESSY/QUASI-LINEAR CONVECTIVE MODES AND 
   2. FCST VEERING OF BOUNDARY-LAYER FLOW AND RESULTANT GRADUAL
   REDUCTION IN LOW-LEVEL SHEAR...TRENDS ALREADY SEEN IN INLAND SFC OBS
   AND VWP AS MAIN SFC LOW CROSSES NRN FL.

   ..EDWARDS.. 04/19/2014


   ATTN...WFO...MFL...MLB...KEY...

   LAT...LON   26218088 26998068 27868045 27218019 26808000 25648014
               25688019 25648026 25448030 25418026 25528018 25188031
               25118073 25118112 25278117 25338111 25408112 25588121
               26218088 

Top/All Mesoscale Discussions/Forecast Products/Home
Weather Topics:
Watches, Mesoscale Discussions, Outlooks, Fire Weather, All Products, Contact Us

NOAA / National Weather Service
National Centers for Environmental Prediction
Storm Prediction Center
120 David L. Boren Blvd.
Norman, OK 73072 U.S.A.
spc.feedback@noaa.gov
Page last modified: April 19, 2014
Disclaimer
Information Quality
Help
Glossary
Privacy Policy
Freedom of Information Act (FOIA)
About Us
Career Opportunities