South Central/South Eastern Squall Line of April 14th/15th 1921

The South Central/Southeastern Squall Line of April 14th/15th, 1921 was a weak squall line that barely reached modern criteria for a derecho system. It was the weakest of the storm systems in the 1921 Squall Line Series.

Meteorological History
A line of rogue storms fired up in the far eastern portions of the South Central World Province at 10:34 PM during the evening of April 14th, when it was originally forecasted to be partly cloudy. By 11:12 PM, the squall line intensified and became severe. It crossed over the border into the Southeastern World Province and dissipated at around 5:34 AM.

Evening Forecast (SCWS)
While storms are expected to fire up in the western portions of the province, the eastern half will experience partly cloudy skies in some areas and clear conditions in others, no development is expected in this area.

Evening Forecast (SEWS)
Clear conditions and mostly cloudy skies are expected in portions of the province. There is no chance of rain today or tomorrow.

Post-Storm Report (SCWS)
A storm system that formed in one of the western countries of the South Central region held together when it passed into the western countries, where it was only forecasted to be partly cloudy in some countries while clear in others. It intensified into a severe squall line. Minimal damage was reported in the region, as most of the damage occurred in the Southeastern province

Post-Storm Report (SEWS)
A squall line passed into the region during the very early hours of April 15th. It caused a bit of damage and a tree fell from the wind, killing 1.

Reclassification Report (1961, SWWS)
Along with 3 other squall lines that occured around the world, the squall line of April 14th, 1921 has been reclassified under a new meteorological term, a derecho. The criteria for a derecho is as follows: the line of storms must last 6 hours or more and have sustained winds of 60 miles per hour throughout the event to be classified as a derecho.