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 482
< Previous MD         Next MD >
MD 482 graphic

   MESOSCALE DISCUSSION 0482
   NWS STORM PREDICTION CENTER NORMAN OK
   0601 PM CDT TUE APR 29 2014

   AREAS AFFECTED...ECNTRL THROUGH SERN MS...SERN LA INTO SWRN AL

   CONCERNING...TORNADO WATCH 116...

   VALID 292301Z - 300030Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 116 CONTINUES.

   SUMMARY...THREAT FOR ISOLATED TORNADOES...LARGE HAIL AND DAMAGING
   WIND GUSTS WILL PERSIST THROUGH EARLY EVENING...FOLLOWED BY A
   GRADUAL DECREASE IN OVERALL THREAT. GREATEST NEAR TERM TORNADO
   THREAT APPEARS TO BE ACROSS SERN MS.

   DISCUSSION...EARLY THIS EVENING AN EXTENSIVE CONVECTIVE OUTFLOW
   BOUNDARY EXTENDS FROM CNTRL FL NWWD INTO THE NRN GULF TO SERN MS TO
   NW OF MERIDIAN WHERE IT INTERSECTS A PACIFIC FRONT THAT EXTENDS FROM
   SCNTRL LA TO CNTRL MS NEAR JACKSON THEN NEWD THROUGH MIDDLE TN. WARM
   SECTOR OVER SERN MS BETWEEN THESE BOUNDARIES IS MODERATELY UNSTABLE
   WITH 1500-2000 J/KG MLCAPE WITH THE STRONGER INSTABILITY LOCATED
   OVER SRN MS AND SERN LA WHERE LOW 70S DEWPOINTS RESIDE. STRONG
   MID-UPPER FLOW ASSOCIATED WITH THE CIRCULATION AROUND A LARGE AREA
   OF LOW PRESSURE IS CONTRIBUTING TO DEEP SHEAR AOA 50 KT.
   HOWEVER...LOW-LEVEL HODOGRAPHS ARE NOT PARTICULARLY LARGE...EXCEPT
   ON COOL SIDE OF THE OUTFLOW BOUNDARY WHERE NEAR SFC WINDS REMAIN
   BACKED RESULTING IN 150-200 M2/S2 0-1 KM STORM RELATIVE HELICITY.
   SOME INCREASE IN THE LLJ IS FORECAST THIS EVENING OVER SERN MS AND
   SWRN AL. STORMS WILL LIKELY CONTINUE DEVELOPING NEXT FEW HOURS IN
   MORE UNSTABLE PORTION OF THE WARM SECTOR OVER SRN MS AND SERN LA.
   TORNADO THREAT WILL PROBABLY BE GREATEST IN NARROW ZONE AS THE
   STRONGER STORMS MOVE ENEWD AND INTERACT WITH THE OUTFLOW BOUNDARY.

   FARTHER NORTH...STORMS ARE ALSO DEVELOPING ALONG PACIFIC FRONT
   ACROSS ECNTRL MS WHERE INSTABILITY IS MORE MARGINAL. WHILE A TORNADO
   THREAT WITH THIS ACTIVITY APPEARS TO BE LESS THAN FARTHER SOUTH...A
   COUPLE OF TORNADOES CANNOT BE RULED OUT AS STORMS INTERACT WITH THE
   OUTFLOW BOUNDARY AND BEFORE MOVING DEEPER INTO THE LESS UNSTABLE
   REGIME.

   ..DIAL.. 04/29/2014


   ATTN...WFO...BMX...MOB...JAN...LIX...

   LAT...LON   30539072 32258969 32998835 31568791 30578837 30539072 

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 30, 2014
Disclaimer
Information Quality
Help
Glossary
Privacy Policy
Freedom of Information Act (FOIA)
About Us
Career Opportunities