summarize this convective weather outlook for someone not familiar with meteorological terms. What large population centers are at the greatest risk of severe weather? "...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
   THE CENTRAL PLAINS AND UPPER MIDWEST...

   ...SUMMARY...
   Scattered severe thunderstorms capable of producing severe/damaging
   gusts, large to very large hail, and a few tornadoes are forecast
   today across parts of the northern/central Plains into the Upper
   Mississippi Valley.

   ...Upper Mississippi Valley...
   With ongoing thunderstorms across parts of MN this morning,
   confidence is lower than usual regarding severe potential and
   convective evolution later today across MN into WI. A decayed MCS
   over western MN this morning and a related MCV/surface low over ND
   will continue to track northeastward across MN through the day. A
   seasonably moist low-level airmass, with surface dewpoints generally
   in the low to mid 60s, is present this morning across southern MN.
   Some northward advance of this low-level moisture across parts of
   central/northern MN is anticipated through the afternoon in advance
   of the MCV and a convectively reinforced front/outflow. Filtered
   daytime heating of this airmass should result in at least moderate
   instability developing in a narrow corridor, with robust convective
   development increasingly likely by 20-22Z.

   There is still a fairly high degree of uncertainty regarding how far
   south intense thunderstorms will develop across MN/eastern SD this
   afternoon/evening. Somewhat greater confidence in severe
   thunderstorms exists in closer proximity to the MCV across central
   into northern MN. Have therefore expanded severe probabilities
   northward a bit across this area. Initial development will likely be
   supercellular given around 35-45 kt of deep-layer shear forecast,
   with an associated threat for scattered large to very large hail
   (isolated 2+ inches in diameter possible). Sufficient low-level
   shear is also forecast with the MCV to support a threat for a few
   tornadoes, especially along an effective warm front that should be
   draped generally west to east across central/northern MN. By early
   evening, some upscale growth/clustering may occur, with an increased
   risk for severe/damaging winds into eastern MN/western WI and
   vicinity. Convection should eventually weaken with eastward extent
   across the Upper MS Valley tonight as it moves into a less unstable
   airmass.

   ...Northern/Central Plains...
   Modest post frontal, low-level upslope flow will occur today across
   parts of the northern Rockies/High Plains. Convective initiation
   should initially occur along/near the higher terrain in southern MT
   and northern/eastern WY by mid to late afternoon. A subtle mid-level
   shortwave trough embedded within otherwise modestly enhanced
   southwesterly flow should aid in this thunderstorm development.
   Steep low/mid-level lapse rates are expected to be in place across
   this region, with daytime heating contributing to moderate
   instability. Strong deep-layer shear around 40-50 kt is expected,
   with elongated/nearly straight hodographs at mid/upper levels
   supporting ample speed shear. Isolated to widely scattered
   supercells will likely pose a threat for large to very large hail as
   they develop east-southeastward over the northern High Plains this
   afternoon and early evening. If a cluster or two can develop this
   evening, then severe wind gusts would be possible given steepened
   low-level lapse rates and a well-mixed boundary layer.

   Additional robust thunderstorms will probably form this afternoon
   along/near a convectively reinforced front that should be draped
   generally northeast to southwest over NE, and separately across the
   higher terrain of eastern WY/northern CO. Strong to locally extreme
   instability is likely to develop along/south of this boundary with
   strong diurnal heating of a moist low-level airmass and the presence
   of steep mid-level lapse rates. Sufficient deep-layer shear should
   also exist to support some updraft organization, with a mix of
   supercells and multicell clusters possible. Initial development
   should pose some threat for large to very large hail. Multiple
   opportunities for clustering and swaths of severe/damaging winds
   (isolated 75+ mph possible in western/central NE) remain apparent,
   both with the convection that develops along the surface boundary in
   NE, and with thunderstorms spreading east-southeastward from the
   northern/central High Plains. A small southward expansion to the
   Enhanced Risk has been made based on latest guidance trends. But,
   confidence remains low in exactly how convective clusters will
   evolve this afternoon/evening."