NZUS99 KLOT 021640
WRKAWP

EXPERIMENTAL AIRPORT WINTER PRECIPITATION OUTLOOK FOR O'HARE
NATIONAL WEATHER SERVICE CHICAGO IL
1040 AM CST MON MAR 2 2015

TIME CST    13    14    15    16    17    18    19    20    21    22    23    00
TIME UTC    19    20    21    22    23    00    01    02    03    04    05    06

% CHC ACCUM
SNOW OR ICE 0     0     0     0     0     10    0     0     0     0     0     0     

SNOW TYPE   N/A   N/A   N/A   N/A   N/A   N/A   N/A   N/A   N/A   N/A   N/A   N/A   

ACCUM RATE  0     0     0     0     0     0     0     0     0     0     0     0     

MIX PRECIP? N/A   N/A   N/A   N/A   N/A   N/A   N/A   N/A   N/A   N/A   N/A   N/A   

TEMP (F)    25    26    27    25    23    21    20    20    20    20    20    20    

WIND DIR    W     SW    SW    S     S     SE    SE    SE    SE    SE    SE    SE    

SPEED (MPH) 2     2     2     3     4     6     6     6     6     6     8     8     

GUST (MPH)                                                                          


REMARKS...NO PROBLEMS WITH WINTRY PRECIPITATION THROUGH THIS
EVENING. HOWEVER...WET SNOW IS EXPECTED TO DEVELOP ACROSS THE
TERMINAL DURING THE PREDAWN HOURS OF TUESDAY...LIKELY AFTER 09
UTC. THE SNOW COULD FALL AT A DECENT CLIP AND MIX WITH SLEET AT
TIMES FOR ABOUT 1 TO 3 HOUR PERIOD THROUGH AROUND 13 TO 15 UTC
TUESDAY MORNING BEFORE TRANSITIONING OVER TO SOME FREEZING RAIN.
IT APPEARS THAT AN INCH OR TWO OF SNOW AND SLEET MAY ACCUMULATE
PRIOR TO THE CHANGE OVER TO FREEZING RAIN AND SLEET. IT IS WORTH
NOTING THAT THERE REMAINS A GOOD AMOUNT OF UNCERTAINTY ON THE
EXACT TIMING OF THIS TRANSITION PERIOD...AS WELL AS THE ACTUAL
EXTENT AND AMOUNTS OF FREEZING RAIN TUESDAY MORNING. SURFACE
TEMPERATURES WILL BE ON A WARMING TREND THROUGH THE MORNING...AND
WILL LIKELY RISE ABOVE FREEZING BY EARLY AFTERNOON...SO ANY
FREEZING PRECIPITATION SHOULD END AROUND MIDDAY. AT THIS TIME IT
APPEARS THAT ANY ICE ACCUMULATIONS WILL REMAIN LIGHT...GENERALLY
UNDER A TENTH OF AN INCH.

&&

.EXTENDED OUTLOOK...06Z TUESDAY THROUGH 00Z WEDNESDAY...

* ACCUMULATING START TIME...AFTER 09 UTC TUESDAY.

* PRECIP TYPE...WET SNOW AT ONSET...POSSIBLY MIXING WITH SHORTLY
  AFTER DAYBREAK...THEN CHANGING TO FREEZING RAIN AFTER 14-15 UTC
  TUESDAY.

* ACCUMULATION RATES...0.5 TO 0.75 INCHES PER HOUR FOR A SHORT
  PERIOD AROUND DAYBREAK TUESDAY. 

* STORM TOTAL ACCUMULATION...SNOW AND SLEET OF 1 TO 2 INCHES...AND
  UP TO A TENTH OF AN INCH OF ICE THROUGH MIDDAY TUESDAY.

* ACCUMULATING END TIME...AROUND MIDDAY TUESDAY.

$$

NO UPDATES TO THIS PRODUCT UNTIL 5 PM

KJB



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