An unusual low pressure system moving in backward direction is causing severe thunderstorms and rainfall in the dry areas in Oklahoma and Texas, US. What is highly unusual for this system is that it moves from east to west or clockwise. Weather systems in the Northern Hemisphere topically moves counterclockwise or from west to east.
GOES composite imagery acquired at 04:00 UTC on July 15, 2013 (Credit: NOAA/GOES)
This is a pretty rare event, having a transcontinental system crossed the entire United States from east to west during any time of the year. Interior US can sometimes catch ex-tropical systems from the Gulf of Mexico but a system developing and moving from the Northeastern USA to Mexico is extremely rare.
GOES Eastern Conus Sector Infrared satellite imagery acquired at 04:45 UTC on July 15, 2013 (Credit: NOAA/GOES)
A low pressure system started in the eastern United States, pushed westward under a ridge of high pressure building in to the north and east. Severe storms, tornadoes, hail, and damaging winds are expected to affect Texas, New Mexico, and parts of Arizona through the next few days. Showers and thunderstorms with locally heavy rainfall already affecting parts of the Southeast and along the Gulf Coast as the upper low continues to track southwestward. This system will bring drought relief but also the high risk for flooding in the region.
GOES East Infrared Ch2 satellite image acquired at 5:15 UTC on July 15, 2013 (Credit: NOAA/GOES)
GOES IR satellite image and jetstream forecast for July 15, 2013 (Credit: NOAA/GOES/SMC-CMC)
This is the second unusual weather pattern in July after an area of low pressure in the upper atmosphere got trapped over the South and brought downpours and thunderstorms that caused flooding from the Gulf Coast to the Appalachians and Ohio Valley on July 4, 2013.
GFS Jetstream forecast (Credit: GFS/SFSU)
Featured image: GOES composite imagery acquired at 04:00 UTC on July 15, 2013 (Credit: NOAA/GOES)
If you value what we do here, create your ad-free account and support our journalism.
Producing content you read on this website takes a lot of time, effort, and hard work. If you value what we do here, select the level of your support and register your account.
Your support makes this project fully self-sustainable and keeps us independent and focused on the content we love to create and share.
All our supporters can browse the website without ads, allowing much faster speeds and a clean interface. Your comments will be instantly approved and you’ll have a direct line of communication with us from within your account dashboard. You can suggest new features and apps and you’ll be able to use them before they go live.
You can choose the level of your support.
Stay kind, vigilant and ready!