ZCZC NFDSPENES ALL
SPENES
MIZ000-WIZ000-ILZ000-MNZ000-IAZ000-
.
SATELLITE PRECIPITATION ESTIMATES..DATE/TIME 12/23/07 0759
SATELLITE ANALYSIS BRANCH/NESDIS---NPPU---TEL.301-763-8678
LATEST DATA USED: G12  0745Z  CK
.
LOCATION...UPPER MICHIGAN...WISCONSIN...ILLINOIS...SE MINNESOTA...
LOCATION...E IOWA...
.
ATTN WFOS...MQT...GRB...LOT...ILX...MKX...DVN...DLH...ARX...MPX...
ATTN RFCS...NCRFC...
.
EVENT...BAROCLINIC LEAF EXPANDS/SPREADS ACRS WI/NW IL...MOD/HVY SNOW
.
SATELLITE ANALYSIS AND TRENDS...BAROCLINIC LEAF MENTIONED IN PREVIOUS
SPENES MESSAGE HAS CONTINUED TO EXPAND N AND NEWD AND NOW EXTENDS FM E IA
TO N WI. IN ADDITION..NEW LEAF HAS BEGUN FORMING JUST TO THE E..OVER NW
IL/S WI. THE FORMATION OF THIS NEW LEAF SUGGESTS THAT MOD TO INCREASINGLY
HVY SNOW WILL BE EXPANDING ACRS NW IL AND S CENTRAL WI.. WHERE LIGHT TO
MOD PRECIP HAS BEEN OCCURRING.
.
OVERALL PICTURE..PER GOES WV IMAGERY..SHOWS THAT UPPR LOW PREVIOUSLY
OVER ND HAS BEEN SLIPPING SEWD INTO SD WHILE BECOMING A BIT MORE
ELONGATED. ASSOCD TROF EXTENDS SEWD ALONG NE/IA BORDER INTO MO. AT THE
SAME TIME..BASE OF TROF IS SWINGING EWD..WITH NET RESULT SHOWING BACKING
OF UPPER FLOW E MN/IA/N IL/WI. BACKING OF FLOW IS ALLOWING FOR N AS WELL
AS NEWD SPREAD OF BAROCLINIC LEAF WITH INCRG SNOW ACRS W AND CENTRAL
WI. AS FOR FORMATION OF NEWER LEAF OVER NW IL/S CENTRAL WI..THIS APPEARS
TO BE RESULTING FROM SEVERAL FACTORS. ONE IS THE VORT OVER W CENTRAL IL
WHICH IS PIVOTING NEWD..WITH CLOUD TOP COOLING INDICATIVE OF INCRG UPWARD
MOTION AHEAD OF VORT AND ATTENDANT LOBE. SECOND IS 85H SW-NE ORIENTED
THETA-E ADVECTION MAX..WHICH ALIGNS CLOSE TO NEW LEAF. ADDITIONALLY..SFC
LOW NOW OVER N IL IS CONTINUING TO INTENSIFY.
.
OVER THE NEXT FEW HRS..STLT TRENDS SUGGEST THAT MOD/HVY SNOW WILL
TAPER OFF OVER SE IA AND ERN IA. WOULD EXPECT MOD/HVY SNOW TO CONTINUE
FOR A AWHILE OVER NE IA/SE MN. WITH NEW BAROCLINIC LEAF OVER NW IL/S
CENTRAL WI LIFTING N MOD PRECIP WILL AFFECT NW IL OVER NEXT COUPLE OF
HRS..WITH SRN EDGE EVENTUALLY LIFTING INTO WI. AS FOR WI..WITH N AND NE
SPREAD OF ORIGINAL LEAF..AND EXPANSION OF NEW LEAF..LOOKS LIKE MOD TO
HVY SNOW WILL AFFECT A GOOD PORTION OF WRN HALF OF WI AS THE OVERNIGHT
PROGRESSES..EVENTUALLY SPREADING INTO W LOWER MI. ABOVE FREEZING TEMPS
OVER SE/E/NE WI WILL KEEP THAT AREA IN RAIN UNTIL SFC LOW MOVES NE AND
DRAGS IN THE COLDER AIR IN ITS WAKE. WITH IMPRESSIVE DYNAMICS AND CLOUD
TOP COOLING/EXPANSION..WOULD ESTIMATE SNOWFALL RATES REACHING 1-2"/HR
OVER PARTS WI..ESP THE S TO CENTRAL PORTIONS..AND EVENTUALLY MOD/HVY
SNOW PUSHING INTO N WI AND W LOWER MI.
.
SEE NCEP HPC DISCUSSION AND QPF/S FOR FORECAST.
....NESDIS IS A MEMBER OF 12 PLANET....
.
SSD/SAB WEB ADDRESS FOR PRECIP ESTIMATES:
HTTP://WWW.SSD.NOAA.GOV/PS/PCPN/
...ALL LOWER CASE EXCEPT /PS/PCPN/
.
LAT...LON 4685 9134 4669 8732 4109 8975 4116 9161 4375 9160
.
NNNN