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Mesoscale Discussion 109 |
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MESOSCALE DISCUSSION 0109
NWS STORM PREDICTION CENTER NORMAN OK
0329 AM CST MON FEB 17 2014
AREAS AFFECTED...PARTS OF NRN IA INTO MUCH OF SRN/ERN MN...INCLUDING
THE MINNEAPOLIS/ST. PAUL AREA
CONCERNING...HEAVY SNOW
VALID 170929Z - 171200Z
CORRECTED CONCERNING LINE FROM HEAVY RAINFALL TO HEAVY SNOW
SUMMARY...A 1 TO 3 HOUR PERIOD WITH HEAVY SNOW RATES ON THE ORDER OF
1 INCH PER HOUR IS EXPECTED ACROSS MOST LOCATIONS...LIKELY IMPACTING
ROAD CONDITIONS THIS MORNING.
DISCUSSION...MODELS SUGGEST THAT FORCING AHEAD OF LARGER-SCALE UPPER
TROUGHING SHIFTING EASTWARD ACROSS THE NORTHERN PLAINS...TOWARD THE
UPPER MISSISSIPPI VALLEY...WILL MAINTAIN THE NORTHEASTWARD/EASTWARD
DEVELOPMENT OF A SIGNIFICANT AREA OF LARGE-SCALE ASCENT ACROSS NORTH
CENTRAL IOWA AND SOUTHERN/EASTERN MINNESOTA THROUGH 12-15Z. THIS IS
WHERE THERMODYNAMIC PROFILES REMAIN COLD AND SUPPORTIVE OF SNOW.
ALTHOUGH SNOW TOTALS ARE EXPECTED TO REMAIN SOMEWHAT
MODEST...PRIMARILY DUE TO LIMITED SNOW DURATION...IT DOES APPEAR
THAT LIFT WILL BECOME MAXIMIZED IN THE DENDRITIC GROWTH LAYER FOR A
1-3 HOUR PERIOD IN MOST LOCATIONS ACROSS THE AREA. COINCIDING WITH
THE NORTHWARD ADVECTION OF PRECIPITABLE WATER IN EXCESS OF .5
INCHES...SNOW RATES MAY AVERAGE ONE INCH PER HOUR...AND MAY IMPACT
THE MINNEAPOLIS/ST. PAUL MN METRO AREA BY 12-14Z.
..KERR.. 02/17/2014
ATTN...WFO...DLH...ARX...MPX...DMX...FSD...
LAT...LON 44279592 45889492 46929260 45459233 43649217 43049371
42859519 44279592
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