National Weather Service Weather Forecast Office

 

A BREAK FROM THE HEAT IS ON THE WAY  !!

 

AFTER AN UNUSUALLY HOT START TO THE SUMMER  DURING THE FIRST

THREE WEEKS OF JUNE, A TEMPORARY RESPITE IS ON THE WAY!

 

THE IMAGE BELOW SHOWS THE CHANGE IN THE UPPER AIR PATTERN

EXPECTED NEXT WEEK (SUNDAY, JUN 27 THROUGH THURSDAY, JUL 1).

 

THE GREEN LINES INDICATE THE WIND FLOW PATTERNS ACROSS THE

UNITED STATES ABOUT 20,000 FEET UP IN THE AIR. THESE WINDS ARE

GENERALLY KNOWN AS  "STEERING CURRENTS," AND THEY HELP TO

GUIDE WARM AND COLD AIR MASSES FROM PLACE TO PLACE.

THE WINDS FLOW FROM WEST TO THE EAST, OVER THE "RIDGES"

AND DOWN THROUGH THE "TROUGHS."

 

AS YOU CAN SEE, DURING THE SUNDAY-THROUGH-THURSDAY PERIOD,

THE "TROUGHS" OVER THE WEST AND EAST COASTS BECOME

DEEPER, WHILE THE "RIDGE" OVER THE CENTRAL UNITED STATES

BUILDS NORTHWARD INTO CENTRAL CANADA.

 

SO, WHAT DOES THIS MEAN FOR MIDDLE TENNESSEE?  WELL,

WHENEVER A STRONG RIDGE BUILDS IN THE UPPER LEVELS OVER THE

CENTRAL UNITED STATES AND CENTRAL CANDADA, IT TENDS TO PUSH

STRONG COLD FRONTS SOUTHWARD INTO TENNESSEE, BRINGING

COOLER AIR  IN FROM THE UPPER MIDWEST.  BY LATE MONDAY AND

MONDAY NIGHT, A STRONG COLD FRONT IS FORECAST TO DROP

SOUTHWARD ACROSS OUR AREA AND BRING A DROP IN TEMPERATURES

AND HUMIDITIES. BY WEDNESDAY AND THURSDAY, DAYTIME HIGHS

WILL BE MAINLY IN THE 80S, WITH NIGHTTIME LOWS DROPPING INTO

THE LOWER AND MIDDLE 60S (WITH EVEN SOME UPPER 50S POSSIBLE

ALONG THE CUMBERLAND PLATEAU!).  DEW POINTS WILL ALSO FALL,

RESULTING IN LOWER AFTERNOON HUMIDITIES.

 

 

 

 

 

 

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