MESOSCALE DISCUSSION 1229
   NWS STORM PREDICTION CENTER NORMAN OK
   0501 AM CDT FRI JUN 19 2009
   
   AREAS AFFECTED...FAR EASTERN NEB AND WESTERN/CENTRAL IA
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 475...
   
   VALID 191001Z - 191100Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 475
   CONTINUES.
   
   SEVERE TSTM WATCH 475 CONTINUES UNTIL 15Z. DAMAGING WIND THREAT WILL
   CONTINUE TO DEVELOP EAST-NORTHEASTWARD ACROSS WESTERN/CENTRAL IA
   THROUGH THE EARLY MORNING HOURS...WITH LOCALLY HEAVY RAINFALL A
   CONCERN AS WELL.
   
   SMALL MCS CONTINUES TO STEADILY PROGRESS EAST-NORTHEASTWARD AT
   AROUND 40-45 KT ACROSS SOUTHWEST-WEST CENTRAL IA AS OF 0945Z. THIS
   CLUSTER HAS A HISTORY OF STRONG/SEVERE WIND GUSTS IN THE OMAHA
   VICINITY...WITH MORE RECENT GUSTS TO AROUND 45 KT PER THE AUDUBON IA
   MESONET /937Z/. THE ORGANIZED NATURE OF THIS MCS...WITH SUBTLE
   PRE-MCS PRESSURE FALLS AND STRONG RISES IN ITS WAKE...ALONG WITH A
   RESIDUALLY MOIST/RATHER UNSTABLE AIRMASS DOWNSTREAM...SUGGESTS A
   CONTINUED POSSIBILITY OF DAMAGING WINDS INTO CENTRAL
   IA...POTENTIALLY INCLUDING THE DES MOINES/AMES VICINITIES WITHIN THE
   NEXT 2 HOURS. FARTHER WEST...IN THE WAKE OF THE LEAD BRUNT OF THE
   MCS...VERY HEAVY RAINFALL WILL BE THE PRIMARY CONCERN ALONG THE I-80
   CORRIDOR OF EASTERN NEB INTO WESTERN IA THROUGH THE EARLY MORNING
   HOURS.
   
   ..GUYER.. 06/19/2009
   
   
   ATTN...WFO...DMX...OAX...
   
   LAT...LON   42079519 42349407 41999254 40699342 40689723 42079519