A major storm will gather strength and moisture this weekend and is forecast to deliver drenching rain and gusty thunderstorms to the Plains.
A storm bringing cooler air and spotty showers and thunderstorms to California at midweek is projected to swing inland over the Southwest by the end of the week.
The storm will use the Four Corners region as a command post to gather a fleet of moisture from the tropical Pacific and the Gulf of Mexico.
Downpours and flash flooding are forecast to drench isolated areas of the Southwest Wednesday into Friday.
The moisture will then shift eastward onto the Great Plains in the form of more broad areas of rain.
As a result, there is the potential for an inch or two of rain, and locally more, to fall on needy areas of Kansas, Nebraska and other Plains states beginning Friday and continuing into the weekend.
Some of the rain will fall on recently planted winter wheat areas.
According to Expert Senior Meteorologist Brett Anderson, "The storm is moving fast; as a result, we don't expect excessive rain and flooding to occur over a broad area."
Like many storms which form in this area of the United States and move northeastward, some of the energy released will not only be in the form of drenching rain. Severe weather is forecast.
Because of the dynamic nature of the storm, there is the risk of incidents of damaging wind gusts, large hail and at least a few tornadoes with the event.
According to Severe Weather Expert Henry Margusity, "Saturday is likely to be the peak of the severe weather with the storm system, but we are likely to have some locally dangerous storms late Friday over the central and southern High Plains."
The worst of the storms Saturday may focus within the zone from eastern Oklahoma to southwestern Wisconsin.
The storm will have its cold side too.
Heavy snow is likely to fall on the high country and perhaps some ski areas from part of the Sierra Nevada to the Wasatch to the Colorado Rockies late in the week.
As the storm moves northeastward, portions of central Ontario and Quebec could also be on the receiving end of heavy snow from the storm later this weekend.
The details of the rain, thunderstorms and snow from the storm system will unfold as the week progresses.
While rain and snow from this storm will avoid the Northwest, a different storm from the Pacific is forecast to begin a spell of wet weather and high country snow beginning late this week.
The track of the storm will rout out a fresh batch of cold air in the East, paving the way for perhaps a week or more of above-normal temperatures starting around Sunday. However, this is not before some of the lowest temperatures of the season occur with the risk of a killing frost and freeze Friday night into Saturday morning.
A renewed risk of severe weather will threaten portions of the north-central United States into midweek.
Heavy downpours will raise the concern for flash flooding along the Gulf Coast and lower Mississippi Valley through midweek.
A stifling heat wave will remain entrenched across the Northeast this week, despite a brief reprieve in humidity for some.
Dangerous heat will surge northward and send temperatures rising across the northwestern United States this week.
Severe thunderstorms rumbled through the Northeast on Monday, lashing the region with damaging winds while also unleashing heavy downpours that triggered flash flooding.
Here are five easy ways to stay cool in sweltering summer heat.
New York/MA (1819)
Two simultaneous cloudbursts, 45 miles apart; A bucket survey claimed 15" of rain fell at Catskill, NY. Highways were completely washed out. One washout started west of the old Albany Post Road and spread eastward across the road until it was 190 feet wide and 80 feet deep in a distance of 160 paces. At Westfield Valley, "suddenly the windows of heaven seemed to have been opened and the rain fell in such torrents that in less than 5 hours, Westfield River rose at least 20 feet above its usual height at low water. The river overflowed its banks with great rapidity and violence, sweeping away every bridge, fence and building which opposed its current."
Pittsburgh, PA (1872)
Cloudburst of 30 minutes followed by a flash flood. Over 133 people drowned on the north side of Butcher Run and Wood's Run.
New Jersey (1892)
Spectacular "double" waterspouts off Barneget Light at heights of 500-600 feet.