[MCD] SWOMCD

[MCD at goshenarc.org]

ACUS11 KWNS 081556
SWOMCD
SPC MCD 081556 
IAZ000-081700-

MESOSCALE DISCUSSION 2163
NWS STORM PREDICTION CENTER NORMAN OK
1056 AM CDT THU SEP 08 2005

AREAS AFFECTED...IA

CONCERNING...SEVERE THUNDERSTORM WATCH 774...

VALID 081556Z - 081700Z

CONTINUE WW. 

CLUSTER OF CONVECTION CONTINUES TO DEVELOP SOUTHEASTWARD ACROSS
NORTHERN INTO CENTRAL IOWA...SUPPORTED BY WEAK MID-LEVEL SHORT WAVE
TROUGH.  MOST VIGOROUS ACTIVITY FORMING ON WESTERN FLANK OF SYSTEM
IS OCCURRING WHERE LOW/MID-LEVEL WARM ADVECTION IS ENHANCED ON
EASTERN PERIPHERY OF CAPPING ELEVATED MIXED LAYER AIR ADVECTING EAST
OF THE MID MISSOURI VALLEY.  STEEPER MID-LEVEL LAPSE RATES AND
STRONGER CONVECTIVE INSTABILITY WILL CONTINUE TO SUPPORT PRIMARY
SEVERE THREAT INTO AREAS JUST NORTH THROUGH NORTHEAST OF DES MOINES
BY 18Z.  STORMS THROUGH MID DAY APPEAR LIKELY TO REMAIN BASED ABOVE
WEAK FRONTAL INVERSION LAYER...BUT AS WARMING OF BOUNDARY LAYER
PROGRESSES...RISK OF DAMAGING WINDS MAY SLOWLY INCREASE...WITH LARGE
HAIL THREAT CONTINUING.

..KERR.. 09/08/2005

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...DMX...

42719456 42889391 42509293 41699260 41599381 42139483
42459482 

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