MESOSCALE DISCUSSION 0710
   NWS STORM PREDICTION CENTER NORMAN OK
   0713 PM CDT SUN MAY 19 2013
   
   AREAS AFFECTED...CNTRL AND SRN IA
   
   CONCERNING...TORNADO WATCH 183...
   
   VALID 200013Z - 200115Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 183 CONTINUES.
   
   SUMMARY...THE SEVERE WEATHER THREAT CONTINUES ACROSS THE WATCH AREA
   WITH THE GREATEST NEAR-TERM RISK FOR TORNADOES...DAMAGING
   WINDS...AND HAIL OVER CNTRL IA.
   
   DISCUSSION...A NOTABLE INCREASE IN TSTMS HAS BEEN OBSERVED OVER THE
   PAST HOUR BETWEEN OMA AND DSM...LIKELY IN RESPONSE TO THE INFLUENCE
   OF A VORTICITY MAXIMUM RAPIDLY MOVING NEWD THROUGH NWRN IA.  AS OF
   2355Z...THE MOST INTENSE STORM /A SUPERCELL/ WAS LOCATED OVER DALLAS
   COUNTY IA WHICH HAS RECENTLY PRODUCED A TORNADO.  GIVEN A
   MOIST...MODERATELY UNSTABLE AIR MASS WHICH COINCIDES WITH A
   KINEMATIC ENVIRONMENT FEATURING LARGELY UNIDIRECTIONAL SLY WINDS
   THROUGH THE LOWEST 4 KM AGL BEFORE VEERING SLIGHTLY TO SSWLY AND
   INCREASING TO 50-60 KT IN THE UPPER TROPOSPHERE...THE THREAT FOR
   EMBEDDED SUPERCELL STRUCTURES WILL PERSIST OVER CNTRL IA THIS
   EVENING.  WHILE DAMAGING WINDS AND LARGE HAIL WILL BE THE PRIMARY
   HAZARDS...ISOLATED TORNADOES WILL BE POSSIBLE WITH THE MOST
   INTENSE/PERSISTENT SUPERCELLS.
   
   OVER ERN IA...A CLUSTER OF STRONG TO SEVERE STORMS CONTINUES ALONG
   THE MS RIVER NEAR MLI.  WHILE VERTICAL SHEAR IS COMPARATIVELY WEAKER
   THAN POINTS TO THE WEST...THE 00Z DVN SOUNDING SUGGESTS THAT
   SUFFICIENT INSTABILITY EXISTS TO SUPPORT AT LEAST AN ISOLATED SEVERE
   WEATHER THREAT FOR THE NEXT COUPLE OF HOURS.
   
   ..MEAD.. 05/20/2013
   
   
   ATTN...WFO...ILX...DVN...DMX...EAX...FSD...OAX...
   
   LAT...LON   42229623 42339029 41549002 40599050 40319093 40439204
               40729316 40629534 41289577 42229623