Weekly Weather Watch – 20 September, 2021

Welcome to this week’s OU Nightly Weekly Weather Watch!  

Norman, OK 

      Oklahoma weather is going to show how quickly it can change this week.  Monday, September 20, 2021, will likely be one of the warmest days of the year with highs in the upper 90s!  However, a strong cold front will push its way through the country today bringing a massive change in temperatures.  This cold front will drop the high temperatures from the upper 90s to the mid-70s on Tuesday, so don’t forget that jacket Tuesday morning!  Once that cold front passes through, the lows could even reach down to the lower 50s.  As the week progresses, the temperatures will begin to heat up again with the weekend high temperatures reaching the low 90s once again. 

Another Active Week in the Tropics 

Hurricane season has not slowed down very much, and the Atlantic Ocean is confirming that fact with two named tropical cyclones and two areas of potential development.  According to the National Hurricane Center and Central Pacific Hurricane Center, Tropical Storm Peter is located northeast of the northernmost Leeward Islands and Tropical Storm Rose is located over the eastern tropical Atlantic Ocean. 

An area of showers and thunderstorms has formed south of the Cabo Verde Islands and has a good chance of developing into a tropical depression.  According to National Hurricane Center and Central Pacific Hurricane Center, upper-level winds are expected to become beneficial for further development over the week with the system forming into a tropical depression by Thursday or Friday.  This system will move westward across the eastern and central tropical Atlantic Ocean at around 10 to 15 mph. 

The second area of potential tropical cyclone development is located southeast of Newfoundland.  According to National Hurricane Center and Central Pacific Hurricane Center, this non-tropical system, also a remnant of Odette, may encounter some favorable conditions for storm formation, like warm water in the north-central Atlantic Ocean.  However, this storm will run into cooler waters over the weekend, thus making further storm development unlikely. 

Fire Weather in the West 

            The West Coast can’t seem to catch a break with the fire weather.  According to the National Weather Service, a Red Flag Warning is in effect until 11 am Tuesday extending from southern San Jose, California, to northern Redding, California.  Gusty winds will create extra dry conditions enhancing the risk of wildfires.  According to NWS Forecast Office Sacramento, CA, the impacts of this Red Flag Warning include easier fire starts and potential for spread of fire and the winds will gust up to 35 mph from the north, northeast with minimum daytime humidity values in the teens to the lower 20s. 

Severe Weather Chances 

With that cold front pushing its way through the United States this week, a chance of severe weather comes with it.  According to the Storm Prediction Center, a slight risk of thunderstorms are possible over parts of the Upper and Mid-Mississippi Valley Monday night.  These storms are capable of producing damaging wind gusts up to 60 mph and hail up to 1 inch in diameter.   

Tuesday, September 21, 2021, will be a calm day in terms of severe weather with no severe weather threats popping up in the forecast. 

However, as that cold front makes its way to the East Coast on Wednesday, September 22, 2021, a marginal risk of severe weather is possible over parts of Ohio, Pennsylvania, Kentucky, West Virginia, Virginia, and Tennessee.  According to the Storm Prediction Center, strong thunderstorms may form and pose the risk of damaging wind gusts and a couple of tornadoes. 

The rest of the week’s forecast shows no significant risk of severe weather, but remember to always keep up to date on the latest forecast because the weather is constantly changing. 

Categories: Weather, Weather Blog

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