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June 23, 2012
The NWS Hastings coverage area is located within the orange outlined area, with the Interstate highways in red.
(Click Radar Loop To Enlarge)
During the early morning hours of June 23rd, folks in central parts of Nebraska experienced a line of thunderstorms which pushed eastward across the state. This line of thunderstorms, or sometimes referred to as a "squall line", was associated with a mesohigh-wake low couplet which produced strong winds across parts of the NWS Hastings coverage area. Simply put, wind speed is directly associated with pressure differences. Air is accelerated from areas of high pressure to areas of low pressure; as a result, we have what is commonly referred to as "wind". Mesohigh-wake low couplets are commonly referred to as "wake lows". There are many dynamic and thermodynamic variables in play during wake low events which make them very difficult to predict. The mesohigh tends to form along the leading edge of the squall line where a convective line exist. On the other hand, we have a wake low which tends to form on the trailing end of a squall line, where stratiform precipitation is occurring. These pressure differences over a relatively small distance result in strong wind speeds. A detailed scientific paper from the American Meteorological Society on "The Linear Dynamics of Squall Line Mesohighs and Wake Lows" by authors, Patrick T. Haertel and Richard H. Johnson, can be found here.
Some of the notable severe weather reports from this event:
Below is a precipitation map which depicts rainfall amounts across south central Nebraska and north central Kansas.