SPC update
...Upper MS Valley...
Morning water vapor imagery shows a broad positively tilted upper
trough across the western states, with the band of primary mid-level
winds extending from the central Rockies into the upper MS Valley.
Embedded within the stronger flow, a progressive shortwave trough is
evident over KS/NE that will track into IA/MN/WI this afternoon and
evening. Strong large-scale forcing ahead of this feature will
result in scattered intense thunderstorms.
Strong southerly low-level winds are transporting mid 60s dewpoints
rapidly northward into IA/MN. Cloud cover is limiting daytime
heating, but sufficient destabilization from cooling/ascent aloft
will lead to convective initiation along/ahead of the surface cold
front by mid-afternoon. Storms will be most numerous over central
MN, with increasingly sparse development with southward extent
across IA. Supercells capable of strong tornadoes and very large
hail appear likely. Storms will track into western WI during the
evening with a continued risk of significant severe weather
...Upper MS Valley...
Morning water vapor imagery shows a broad positively tilted upper
trough across the western states, with the band of primary mid-level
winds extending from the central Rockies into the upper MS Valley.
Embedded within the stronger flow, a progressive shortwave trough is
evident over KS/NE that will track into IA/MN/WI this afternoon and
evening. Strong large-scale forcing ahead of this feature will
result in scattered intense thunderstorms.
Strong southerly low-level winds are transporting mid 60s dewpoints
rapidly northward into IA/MN. Cloud cover is limiting daytime
heating, but sufficient destabilization from cooling/ascent aloft
will lead to convective initiation along/ahead of the surface cold
front by mid-afternoon. Storms will be most numerous over central
MN, with increasingly sparse development with southward extent
across IA. Supercells capable of strong tornadoes and very large
hail appear likely. Storms will track into western WI during the
evening with a continued risk of significant severe weather