SWOMCD
SPC MCD 062354
WIZ000-IAZ000-MNZ000-NEZ000-SDZ000-070100-
MESOSCALE DISCUSSION 1704
NWS STORM PREDICTION CENTER NORMAN OK
0654 PM CDT SUN JUL 06 2008
AREAS AFFECTED...SE SD...NE NEB...S MN...N AND CNTRL IA
CONCERNING...SEVERE THUNDERSTORM WATCH 661...
VALID 062354Z - 070100Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 661
CONTINUES.
AMIDST WEAK VERTICAL SHEAR...EXPANDING MCS HAS HAD SOME INTRIGUING
CHARACTERISTICS. EARLIER ATTEMPTS AT SUSTAINING A SEWD MOVING TSTM
CLUSTER HAVE FAILED AS STRONGER LOW-LVL FLOW RESULTED IN PREFERRED
DEVELOPMENT/PROPAGATION TO THE ENE INTO NC/NE IA. THE ANVIL DEBRIS
HAS CONSEQUENTLY BEEN LEFT BEHIND AND HAS BEEN EXPANDING SWD INTO
WHAT WAS ONCE A FAIRLY UNSTABLE ENVIRONMENT. BUT...SHADING/COOLING
BOUNDARY LAYER HAS CONTRIBUTED TO INCREASED CAPPING.
THROUGH MID-EVENING...PREFERENTIAL DEVELOPMENT WILL LIKELY BE FROM
MASON CITY-CHARLES CITY IA REGION NEWD INTO PARTS OF SW WI...THOUGH
WITH NE EXTENT...BUOYANCY DROPS OFF CONSIDERABLY. VERTICAL SHEAR IS
NOT IMPRESSIVE...BUT AS CORES COLLAPSE...AT LEAST ISOLD DMGG WINDS
MAY RESULT.
LATER THIS EVENING...OTHER ELEVATED STORMS MAY BEGIN TO DEVELOP ATOP
THE COLD POOL SITUATED OVER THE CORN BELT. SOME OF THESE STORMS MAY
CONTAIN HAIL...BUT WIDESPREAD SVR WEATHER IS NOT ANTICIPATED. HEAVY
RAINFALL WILL BE THE MAIN THREAT.
AT THIS POINT IN TIME...A NEW WW DOWNSTREAM INTO THE AFOREMENTIONED
AREAS OF NE IA/SW WI IS NOT ANTICIPATED.
..RACY.. 07/06/2008
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...DVN...ARX...MPX...DMX...FSD...OAX...
43089606 44259423 44309127 43979055 43049058 42549123
42499236 41519471 42559660
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