|
| Mesoscale Discussion 9 |
|
< Previous MD
Next MD >
|
|
MESOSCALE DISCUSSION 0009
NWS STORM PREDICTION CENTER NORMAN OK
1208 AM CST SUN JAN 04 2009
AREAS AFFECTED...E-CENTRAL WI AND PARTS OF CENTRAL-NRN MI
CONCERNING...WINTER MIXED PRECIPITATION
VALID 040608Z - 040945Z
MIXED PRECIPITATION RATES UP TO 0.05 INCH PER HOUR ARE POSSIBLE IN A
CORRIDOR FROM E-CENTRAL WI TO PARTS OF NRN MI THROUGH 12Z. INITIAL
PRECIP OVER NRN MI MAY BEGIN AS SNOW/SLEET BUT TRANSITION TO
SLEET/FZRA DURING THE LATER HALF OF THE EVENT.
REGIONAL RADAR MOSAIC AT 06Z SHOWS A SWATH OF GENERALLY LIGHT
REFLECTIVITIES ACROSS NERN WI EXTENDING NWD INTO THE MI U.P. AND A
BAND OF LIGHT PRECIP OVER S-CENTRAL WI. THE BACK EDGE OF THE
APPRECIABLE PRECIPITATION RATES WITH INITIAL WAA INDUCED PRECIP
APPEARS TO BE ASSOCIATED ALONG AND NEAR A 850MB
CONFLUENCE/BAROCLINIC ZONE LIFTING TO THE NE OVER THE DOOR PENINSULA
AND WRN MI. OBSERVED PRECIPITATION OF 0.15 INCH PER 3 HOUR PERIOD
HAS BEEN REPORTED WITH THIS ZONE OF PRECIP IN E-CENTRAL WI LATE THIS
EVENING.
AS THE SHORTWAVE TROUGH GLANCES THE REGION OVERNIGHT...AMPLE UVV/S
AND STRONG LOW LEVEL ISENTROPIC ASCENT ARE OCCURRING -- EVIDENT BY
RECENT GRB VWP DATA /50 KT 850MB JET/. LOW LEVEL MOISTURE ADVECTION
/AREA GPS PW DATA INCREASING TO AOA 0.50 INCH/ INTO THE REGION WILL
LIKELY CONTINUE...AND SUPPORT SUFFICIENT MIXED PRECIPITATION RATES
DURING THE OVERNIGHT HOURS OVER PARTS OF ERN WI AND CENTRAL-NRN MI.
..SMITH.. 01/04/2009
...NOTICE...
SPC WINTER WEATHER MESOSCALE DISCUSSIONS WILL BE ISSUED ON A
SCHEDULED BASIS FROM DECEMBER 1 THROUGH FEBRUARY 28...FOUR
TIMES A DAY...AROUND 00 UTC...06 UTC...12 UTC...AND 18 UTC
FOR SIGNIFICANT SHORT RANGE WINTER WEATHER EVENTS.
ATTN...WFO...APX...GRR...MQT...GRB...MKX...ARX...
LAT...LON 44938366 44068412 43208614 43338823 43138963 43868968
45448815 46178769 46678572 46428428 44938366
|
|
Top/All Mesoscale Discussions/Forecast Products/Home
|
|