DAY48SVR: Nws Storm Prediction Center Norman Ok

ACUS48 KWNS 210853
SWOD48
SPC AC 210852

DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0352 AM CDT MON OCT 21 2013

VALID 241200Z - 291200Z

...DISCUSSION...
THE MEDIUM RANGE MODELS BEGIN THE DAY 4 TO 8 PERIOD WITH AN
UPPER-LEVEL TROUGH OVER THE NCNTRL U.S. AND MOVE THIS FEATURE SEWD
ACROSS THE MS VALLEY ON THURSDAY/DAY 4. THE UPPER-LEVEL TROUGH IS
FORECAST TO MOVE ACROSS THE ATLANTIC SEABOARD AND INTO THE WRN
ATLANTIC ON FRIDAY/DAY 5. ANOTHER UPPER-LEVEL TROUGH IS FORECAST TO
MOVE ACROSS THE GREAT LAKES REGION AND MID MS VALLEY ON SATURDAY/DAY
6. THIS PERSISTENT UPPER-LEVEL PATTERN ALONG WITH NWLY FLOW IN THE
CNTRL STATES WILL REINFORCE A COOL AND DRY AIRMASS OVER MUCH OF THE
CONUS LIMITING THUNDERSTORM DEVELOPMENT DURING MOST OF THE DAY 4 TO
8 PERIOD.

..BROYLES.. 10/21/2013

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