SPC MESOSCALE DISCUSSION 0280 FOR E-CENTRAL MN...CENTRAL/NRN WI...
UPPER MI
CONCERNING...WINTER MIXED PRECIPITATION...

VALID 121550Z - 122000Z

SNOWFALL RATES OF 1 IN/HR ARE EXPECTED AT TIMES THROUGH THE
AFTERNOON HOURS FROM E-CENTRAL MN EWD ACROSS CENTRAL/NRN WI AND
UPPER MI. SNOW WILL LIKELY MIX WITH SLEET AND FREEZING RAIN BY
EARLY AFTERNOON IN VICINITY OF GREEN BAY. 

SURFACE CYCLONE CENTERED OVER N-CENTRAL IA AT 12/15Z CONTINUES TO
MOVE NNEWD AND DEEPEN AT A RATE OF 0.5-1 MB/HR IN STRONGLY
DIFFLUENT UPPER TROPOSPHERIC FLOW. THE SYNOPTIC-SCALE WARM FRONT
EXTENDS SEWD ACROSS CENTRAL IL...WITH STRONG LOW-LEVEL WARM-AIR
ADVECTION ACROSS CENTRAL/SRN WI EXPECTED TO CONTINUE DURING THE
NEXT SEVERAL HOURS. ALTHOUGH A DRY SLOT IS DEVELOPING INTO EXTREME
SRN MN AT THE PRESENT TIME...VISIBLE SATELLITE IMAGERY INDICATES A
DEFORMATION ZONE STRENGTHENING IN THE NWRN QUADRANT OF THE SURFACE
LOW...WHICH WILL BRING A PERSISTENT BAND OF MODERATE TO
OCCASIONALLY HEAVY SNOW FROM 20 N RWF TO 70 NE MSP THROUGH MID-
AFTERNOON. FURTHER EAST...STRONG WARM AIR ADVECTION/UVV WILL
SUPPORT MODERATE TO OCCASIONALLY HEAVY SNOW ACROSS CENTRAL/NRN WI
AND UPPER MI. THERMAL STRATIFICATION WILL BECOME MORE FAVORABLE FOR
SLEET/FREEZING RAIN AROUND 12/18-19Z IN GREEN BAY VICINITY...WHILE
VERTICAL PROFILE WILL CONTINUE TO SUPPORT SNOW FURTHER NORTH AND
WEST. 

..BANACOS.. 03/12/01