Weather Underground midday recap for Saturday, April 27, 2013.
Shower and thunderstorm activity persisted across the South on Saturday, as a trough of low pressure moved eastward from the Southern Plains and into the Tennessee Valley. Flow around this system pulled in abundant moisture and energy from the Gulf of Mexico, which allowed for strong thunderstorms with periods of heavy rainfall and strong winds. Severe thunderstorms were possible in these areas, with main threats of hail, strong winds, and possibly a few tornadoes. However, severe thunderstorms have not yet been reported. This system has a history of producing quarter size hail and wind gusts over 60 mph. Most areas across the Mid- and Lower Mississippi River Valley and into the Tennessee Valley saw 1 to 2 inches of rain, while heaviest rainfall was reported at Jackson, Tennessee with a mid-day total of 2.11 inches. Throughout the day, showers and thunderstorms from this system advanced eastward into the Ohio River Valley, which allowed for flooding to remain of concern for the region. The back side of this system created a cold front that stretched across Texas, which also kicked up showers and thunderstorms. Severe storms have not yet developed in these areas but were likely due to ample moisture and energy from the Gulf of Mexico.
Out West, a series of disturbances moved through the Pacific Northwest as a system moved through western Canada. This allowed for rain showers to develop across Washington, which moved into the Northern Rockies into the afternoon and evening hours.
Temperatures in the Lower 48 states Saturday have ranged from a morning low of 18 degrees at Leadville, Colo. to a midday high of 97 degrees at Thermal, Calif.