FOCN45 CWWG 061900
SIGNIFICANT WEATHER DISCUSSION ISSUED BY THE PRAIRIE AND ARCTIC STORM
PREDICTION CENTRE OF ENVIRONMENT CANADA AT 2:00 PM CDT SATURDAY
SEPTEMBER 6 2008.
DISCUSSION...UPPER LOW OVER EAST-CENTRAL MANITOBA SLOWLY MOVING
TO THE EAST WITH SURFACE TROUGH TRAILING WESTWARD THROUGH SK AND
INTO EASTERN AB.  AN UPPER WAVE OVER SOUTHEAST SASKATCHEWAN IS
TRACKING EASTWARD INTO SOUTHERN MANITOBA. AIRMASS REMAINS SOMEWHAT
UNSTABLE OVER MUCH OF SOUTHERN AND CENTRAL SASKATCHEWAN AND
MANITOBA.  WITH GENERALLY WEAK SHEAR AND WEAK TO MODEST CAPES, NO
SIGNIFICANT THUNDERSTORMS ARE EXPECTED.  HOWEVER, THE CONDITIONS DO
FAVOUR NON-SUPERCELL FUNNELS AND TORNADOES FOR SOME AREAS.
CURRENTLY THE MOST LIKELY AREAS ARE SOUTHERN MB NEAR AND AHEAD OF
THE UPPER WAVE, NEAR AND SOUTHWEST OF THE UPPER LOW AND POSSIBLY
ALONG THE TRAILING TROUGH INTO SASKATCHEWAN.  THERE IS ALSO SOME
POTENTIAL FOR WATERSPOUTS ON THE MB LAKES GIVEN THE STILL WARM WATER
TEMPERATURES. WILL HOLD OFF WITH THE TORNADO WATCHES UNTIL WE
CAN GET A BETTER SENSE OF THIS POTENTIAL.  IN THE WAKE OF THE UPPER
TROUGH OVERNIGHT, WINDS COULD APPROACH STRONG WIND WARNING CRITERIA
OVER THE MB LAKES.
WEAK RIDGE OF HIGH PRESSURE LIES FROM THE BEAUFORT SEA SOUTHWARD
THROUGH ALBERTA.  IT WILL SLOWLY BUILD INTO SOUTHERN SK OVERNIGHT.
FOG VICINITY AND EAST OF THE RIDGE IS POSSIBLE TONIGHT.  AREAS
THAT STAY CLEAR UNDER THE RIDGE WILL SEE TEMPERATURES APPROACH
FREEZING.  FROST WARNINGS ARE BEING CONSIDERED.
AB..COOL UNSTBL AMS CONT ACRS PROV. FEW EMBDD IMPULSES IN NWLY FLO
ALOFT ENUF TO SET OFF FEW SHWRS AND XPC TO SEE ISOLD WK CBS THIS
AFTN ESPLY ALG FTHLS AREAS. AS MENTIONED ABV WILL ASSESS FOR AREAS
WHERE FROST WARNINGS MAY BE NEEDED. OTWZ GNLY PRETTY QUIET.
END/MCCARTHY/KNOTT/SCHULER