MESOSCALE DISCUSSION 1036
   NWS STORM PREDICTION CENTER NORMAN OK
   1009 PM CDT MON MAY 30 2011
   
   AREAS AFFECTED...PORTIONS EXTREME ERN ND...WRN/CENTRAL/NRN
   MN...EXTREME ERN SD...NWRN IA.
   
   CONCERNING...TORNADO WATCH 406...
   
   VALID 310309Z - 310515Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 406 CONTINUES.
   
   PROBABLE SERIAL-DERECHO EVENT UNDERWAY ATTM WITH MCS FROM KS TO NERN
   MN...AND MEASURED SVR GUSTS AT SEVERAL POINTS ALONG ITS LENGTH.  WW
   MAY BE CLEARED BEHIND MCS...GIVEN STRENGTH OF TRAILING COLD-POOL
   STABILIZATION.
   
   PRONOUNCED BOW ECHO...HAVING PRODUCED 63-KT GUST AND EXTENSIVE
   REPORTS OF DAMAGE AROUND FAR SHORTLY AFTER 02Z...IS MOVING NNEWD
   ABOUT 60 KT...ITS WRN PORTIONS OVERTAKING BAND OF RELATIVELY
   DISCRETE AND CLUSTERED TSTMS NEAR RED RIVER THAT INCLUDES OCNL
   SUPERCELL STRUCTURES.  ALTHOUGH IT WILL BE MOVING INTO SLIGHTLY MORE
   SUBSTANTIAL MLCINH NE OF WARM FRONT NEAR CANADIAN BORDER BY ABOUT
   04Z...BOW POSES CONTINUED THREAT OF DAMAGE OVER EXTREME NWRN MN. 
   ADDITIONAL FORMATION OF BOWING SEGMENTS AND LEWPS WITH RELATIVELY
   CONCENTRATED THREAT OF DAMAGING GUSTS LOCALLY...AS WELL AS EMBEDDED
   AND/OR LEADING-EDGE TORNADOES.  AS OF 03Z...WARM FRONT EXTENDED SEWD
   FROM NEAR NWRN MN BOW ECHO...TO NEAR BRD-AUW LINE.  ALTHOUGH
   CONVECTION SHOULD OVERTAKE THIS FRONT FROM W-E WITH TIME...EFFECTIVE
   INFLOW PARCELS THAT ARE SFC-BASED OR NEARLY SO WILL SPREAD NWD
   ACROSS MORE OF NRN MN FROM S-N AS SLOPE OF WARM FRONTAL ZONE BECOMES
   MORE SHALLOW.  S OF FRONT IN WARM SECTOR...CORRIDOR OF NEGLIGIBLY
   CAPPED SFC PARCELS AND 2000-3000 J/KG MLCAPE WILL BE SUPPORTED BY
   SFC DEW POINTS GENERALLY MID-UPPER 60S F.  KINEMATIC ENVIRONMENT
   REMAINS FAVORABLE WITH 55-65 KT EFFECTIVE SHEAR MAGNITUDES.
   
   ..EDWARDS.. 05/31/2011
   
   
   ATTN...WFO...DLH...MPX...DMX...FGF...FSD...ABR...
   
   LAT...LON   48609299 46149314 44989411 44159437 43019506 43049719
               43599613 44459610 44789631 45059655 45659593 46449552
               47199555 47889652 47829719 47699732 49049684 48999518
               49379507 49319482 49039474 48759466 48719427 48609386
               48499375 48629330 48609299