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Weather conditions on bar directly above are near Lakefront. Weather conditions with Moon are O'Hare (official).

Saturday, February 1, 2014

Chicago Weather O'Hare Data February 01 2014

0123:51NW 910.00OvercastFEW030 BKN150 OVC2502114262074%11NA30.071019.1
0122:51NW 710.00OvercastBKN150 OVC250211474%12NA30.051018.4
0121:51NW 96.00Overcast with HazeFEW015 BKN150 OVC250221678%12NA30.031017.9
0120:51NW 89.00OvercastFEW012 BKN150 OVC250241877%15NA30.021017.6
0119:51N 610.00OvercastFEW010 SCT110 BKN150 OVC300241877%17NA30.001016.9
0118:51N 77.00Light SnowFEW010 SCT025 BKN110 OVC200261975%18NA29.971015.8
0117:51N 79.00Light SnowSCT012 BKN017 BKN080 OVC2002620312678%18NA29.941014.70.020.06
0116:51N 93.00Light SnowOVC010282278%19NA29.911013.70.02
0115:51N 93.00Light SnowOVC012292378%21NA29.891012.90.01
0114:51N 124.00Light SnowBKN012 OVC023302375%20NA29.851011.60.010.03
0113:51N 122.00Light SnowBKN010 OVC028302479%20NA29.841011.20.01
0112:51N 102.00Light SnowOVC010312579%22NA29.841011.10.01
0111:51N 90.50SnowBKN009 OVC0143126312482%23NA29.851011.80.010.24
0110:51NE 83.00Light SnowOVC007302582%22NA29.87NA
0109:51N 83.00Overcast with HazeBKN007 OVC019302479%22NA29.901013.40.02
0108:51N 70.75Light SnowVV009262284%18NA29.891013.00.040.21
0107:51N 60.25Heavy SnowVV009252185%18NA29.931014.30.08
0106:51N 90.50SnowVV009241981%14NA29.931014.50.09
0105:51N 80.75Light SnowVV0072419242281%15NA29.941014.80.100.13
0104:50N 61.00Light SnowVV014241981%17NA29.971015.70.03
0103:51NE 72.00Light SnowBKN007 OVC017231778%15NA29.961015.6
0102:51NE 54.00Light SnowBKN010 OVC018231778%17NA30.001016.8
0101:51NE 56.00Light SnowSCT012 BKN022 OVC028221678%15NA30.021017.4
0100:51N 66.00Light SnowOVC065221678%14NA30.041018.1

CHICAGO O'HARE CURRENT AND HISTORY (3-DAY) ... | NWS OFFICE OBSERVED WEATHER REPORTS

...THE CHICAGO-OHARE CLIMATE SUMMARY FOR FEBRUARY 1 2014...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1871 TO 2014


WEATHER ITEM   OBSERVED TIME   RECORD YEAR NORMAL DEPARTURE LAST
                VALUE   (LST)  VALUE       VALUE  FROM      YEAR
                                                  NORMAL
..................................................................
TEMPERATURE (F)
 YESTERDAY
  MAXIMUM         31    150 PM  56    1968  32     -1       14
  MINIMUM         20   1104 PM -14    1985  17      3        0
  AVERAGE         26                        24      2        7

PRECIPITATION (IN)
  YESTERDAY        0.43          0.74 2011   0.05   0.38     0.02
  MONTH TO DATE    0.43                      0.05   0.38     0.02
  SINCE DEC 1      5.19                      4.03   1.16     5.86
  SINCE JAN 1      3.25                      1.78   1.47     3.65

SNOWFALL (IN)
  YESTERDAY        3.8          13.6  2011   0.4    3.4      0.5
  MONTH TO DATE    3.8                       0.4    3.4      0.5
  SINCE DEC 1     51.7                      19.4   32.3      4.0
  SINCE JUL 1     52.6                      20.9   31.7      4.0
  SNOW DEPTH       4

DEGREE DAYS
 HEATING
  YESTERDAY       39                        41     -2       58
  MONTH TO DATE   39                        41     -2       58
  SINCE DEC 1   2843                      2475    368     2127
  SINCE JUL 1   4126                      3731    395     3377

 COOLING
  YESTERDAY        0                         0      0        0
  MONTH TO DATE    0                         0      0        0
  SINCE DEC 1      0                         0      0        0
  SINCE JAN 1      0                         0      0        0
..................................................................


WIND (MPH)
  HIGHEST WIND SPEED    14   HIGHEST WIND DIRECTION     N (20)
  HIGHEST GUST SPEED    20   HIGHEST GUST DIRECTION    NE (40)
  AVERAGE WIND SPEED     7.0


SKY COVER
  POSSIBLE SUNSHINE  MM
  AVERAGE SKY COVER 1.0


WEATHER CONDITIONS
 THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
  HEAVY SNOW
  SNOW
  LIGHT SNOW
  FOG
  HAZE


RELATIVE HUMIDITY (PERCENT)
 HIGHEST    88           800 AM
 LOWEST     71          1100 PM
 AVERAGE    80

..........................................................


THE CHICAGO-OHARE CLIMATE NORMALS FOR TODAY
                         NORMAL    RECORD    YEAR
 MAXIMUM TEMPERATURE (F)   32        51      1992
 MINIMUM TEMPERATURE (F)   17       -16      1996


SUNRISE AND SUNSET
FEBRUARY  2 2014......SUNRISE   703 AM CST   SUNSET   508 PM CST
FEBRUARY  3 2014......SUNRISE   702 AM CST   SUNSET   509 PM CST


-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.

000
CDUS43 KLOT 020705
CLIORD


CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
104 AM CST SUN FEB 2 2014

Forecast discussion at 9:32 a.m. with Winter Storm Warning in effect and snow diminishing early ...

000
FXUS63 KLOT 011411
AFDLOT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
811 AM CST SAT FEB 1 2014

.DISCUSSION...
333 AM CST

THIS MORNING...

WINTER STORM CONTINUES TO DEVELOP EARLY THIS MORNING AFTER A LULL
OVERNIGHT...HOWEVER STRONG WARM AIR ADVECTION UPSTREAM OF THE
FORECAST AREA COUPLED WITH A POTENT LLVL FORCING IS GENERATING A
NARROW CHANNEL OF INTENSE PRECIPITATION.

MUCH OF THE OVERNIGHT HOURS HAD A LULL...LARGELY IN PART TO THE
QUASI-STATIONARY SFC RIDGE JUST NORTH OF THE FORECAST AREA. THIS
RESULTED IN A CONTINUED FEED OF DRIER LLVL AIR INTO NORTHERN
IL/NORTHWEST IN. THE LEADING EDGE OF THE COLDER CLOUDS CONTINUED TO
BE ERODED AS IT PUSHED NORTHEAST INTO THE PESKY ANTI-CYCLONIC
FEATURE. MEANWHILE WELL UPSTREAM OF THE FORECAST AREA IN EASTERN
KANSAS/NORTHEAST OKLAHOMA...WHERE STRONG FGEN FORCING AND
CYCLOGENESIS WAS TAKING PLACE...A NARROW CHANNEL OF INTENSE
PRECIPITATION WAS NOTED FROM SFC OBS INDICATING M1/4SM VSBYS WITH
+SN. BY 9Z THIS MORNING THIS AREA OF PRECIP HAD QUICKLY EXPANDED
NORTHEAST...AS A LARGE SLUG OF WATER VAPOR PUSHED INTO NORTHEAST
IA/NORTHWEST IL/NORTHEAST MO. LOCAL RADAR NOTED STEADILY INCREASING
RETURNS BY 9Z OVER THE FORECAST AREA...WITH A HANDFUL OF POINTS
ALONG AND WEST OF A STERLING TO PONTIAC LINE BEGINNING TO REPORT LGT
SNOW.

THEN THE CHALLENGE BEGINS FOR MID-MORNING THRU MIDDAY...WITH RESPECT
TO HOW MUCH FREEZING RAIN THE SOUTHERN PORTIONS OF THE CWFA RECEIVE.
THEN TO THE NORTH OF THIS...HOW MUCH SNOW. DUE TO THE PESKY SFC
RIDGE TO THE NORTH...THE BETTER PUSH OF WARMER LLVL AIR HAS REMAINED
WELL SOUTH ACROSS SOUTHERN IL WHERE SFC TEMPS ARE HOVERING EARLY
THIS MORNING ARND 32 DEGREES. HOWEVER EXPECT WITH THE RAPID GROWTH
AND EXPANSION OF THE MODERATE SNOW OVERSPREADING NORTHERN IL BY
11-14Z...TEMPS SOUTH OF LASALLE TO KANKAKEE WILL BEGIN TO WARM INTO
THE UPR 20S.

MOST GUIDANCE MEMBERS HAVE BACKED OFF ON THE QPF TOTALS FOR
TDY...LARGELY DUE TO THE LULL OVERNIGHT AND WITH THE WAVE AT 850MB
REMAINING OPEN AND PROGRESSIVE...THIS APPEARS TO MAKE SOME SENSE.
HOWEVER WITH THE IMPRESSIVE DYNAMICS GOING ON UPSTREAM EARLY THIS
MORNING...IT IS DIFFICULT TO MAKE TOO MANY CHANGES. THE ONE AREA
THAT CONFIDENCE IS SLIGHTLY HIGHER ON IS THAT SNOWFALL TOTALS MAY
FALL JUST UNDER EARLIER THINKING. HAVE HELD ONTO THE CURRENT WINTER
STORM WARNING AND ADVISORIES...BUT FEEL IT WILL BE MORE IN LINE WITH
THE HIGHEST SNOWFALL TOTALS AROUND 5 TO 8". LOCAL HI-RES WRF OUTPUT
SUGGESTS THE AXIS OF BETTER QPF AND SNOWFALL WOULD FALL FURTHER
SOUTH THEN CURRENT THINKING...OR ALONG A LASALLE/PONTIAC TO SOUTH
CHICAGO/MICHIGAN CITY LINE. COBB OUTPUT FOR A HANDFUL OF POINTS
INDICATE GENERALLY AROUND 5 TO 7".

AS FOR FREEZING RAIN...THE STRONG WARM AIR ADVECTION NOTED EARLY
THIS MORNING UPSTREAM OF THE FORECAST AREA...IS SHOWING UP IN THE
MODEL SOUNDINGS ACROSS THE SOUTHERN CWFA. HOWEVER PROFILES ONLY HUG
THE 0 DEG ISOTHERM...SUGGESTING THAT PERHAPS ONLY A PARTIAL MELT
WILL OCCUR. GIVEN THE STRONG FORCING THAT IS ANTICIPATED...WILL
CONTINUE TO OPT FOR A FULL MELT IN THE SOUTHERN CWFA WITH P-TYPE
CHANGING TO FZRA OR A PERIOD OF RA LATER THIS MORNING THRU EARLY
AFTN.

THE BULK OF THE SNOW WILL BE SLOWER TO END THIS AFTN FROM WEST TO
EAST...AS HIGH PRESSURE ACROSS THE NORTHERN PLAINS DRIFTS EAST
THROUGHOUT THE DAY. COULD SEE THE NEED FOR LGT SNOW LINGERING ACROSS
THE WESTERN CWFA INTO THE LATE AFTN HOURS BEFORE ENDING. TEMPS FOR
THE BULK OF THE CWFA WILL WARM INTO THE MID/UPR 20S...WITH AREAS
ALONG AND SOUTH OF LASALLE TO CHICAGO SEEING TEMPS ARND 30 TO THE
LOWER 30S. CLOSER TO GIBSON CITY TO DEMOTTE TEMPS MAY WARM INTO THE
UPR 30S.

BEACHLER

SUNDAY THROUGH MONDAY...
SURFACE HIGH WILL TRANSLATE EASTWARD FROM THE CENTRAL PLAINS ACROSS
THE MID MISSISSIPPI VALLEY WHICH IN COMBINATION WITH SHORTWAVE
RIDGING ALOFT WILL PROVIDE DRY ALBEIT COOL WEATHER THROUGH THE
PERIOD. H85 TEMPS BOTTOM OUT AROUND -12C AND EXPECT SURFACE TEMPS TO
ONLY BE ABLE TO WARM INTO THE MID TEENS SUNDAY AFTERNOON. SUNDAY
NIGHT THE RIDGE AXIS WILL MOVE OVERHEAD AND SKIES SHOULD BE MOSTLY
CLEAR SETTING UP A FAVORABLE RADIATIONAL COOLING SETUP RESULTING IN
LOWS ONCE AGAIN FALLING BELOW ZERO FOR MUCH OF THE CWA. SURFACE HIGH
STAYS OVER THE AREA ON MONDAY BUT OUR NEXT SYSTEM DEVELOPING OVER
THE SOUTHERN PLAINS WILL BEGIN TO LIFT THE H85 BAROCLINIC ZONE
TOWARDS THE AREA. EXPECT CLOUD COVER TO INCREASE ON MONDAY AS
ISENTROPIC ASCENT OVERSPREADS THE AREA.

TUESDAY AND TUESDAY NIGHT...
CLOSED CIRCULATION READILY APPARENT OVER THE NORTH PACIFIC THIS
MORNING WILL REACH THE SOUTHERN PLAINS BY EARLY TUESDAY...THEN LIFT
INTO THE MID MISSISSIPPI VALLEY BY LATE TUESDAY EVENING. SURFACE LOW
WILL BEGIN TO DEEPEN EARLY TUESDAY OVER ARKLATEX THEN LIFT INTO THE
MID TO UPPER MISSISSIPPI VALLEY BY TUESDAY EVENING. THIS IS IN LINE
WITH PREVIOUS RUNS WITH FAIRLY DECENT AGREEMENT BETWEEN THE MODELS
THIS FAR OUT. TOP-DOWN SATURATION IS EXPECTED TO OCCUR AHEAD OF THE
LOW TUESDAY IN THE WARM ADVECTION...THEN DEFORMATION ZONE WITH THE
HEAVIEST SNOWFALL IS EXPECTED TO MOVE OVER THE AREA TUESDAY EVENING
AND TUESDAY NIGHT. CONTINUE TO SUSPECT THAT GUIDANCE IS SPREADING
THE PRECIP TOO FAR NORTHWEST AND EXPECT THAT A SHARPER CUTOFF IN THE
ACCUMULATING SNOW WILL OCCUR THAN MODELS ARE DEPICTING GIVEN THE
TRACK OF THE LOW. FOR THIS REASON PREFER A SOLUTION SIMILAR TO THE
GEM WHICH KEEPS THE AXIS OF HEAVIEST SNOW ALONG AND SOUTH OF THE
I-80 CORRIDOR...AGAIN BASED ON THE CURRENT PROJECTED SURFACE LOW
PATH. WITH THE UPPER WAVE STILL OFFSHORE...WE`LL LIKELY SEE SOME
ADJUSTMENTS IN THE TRACK IN THE COMING DAYS SO THERE WILL BE
REFINEMENTS...THOUGH SEVERAL INCHES APPEAR FAVORABLE ESPECIALLY IN
THE SOUTHERN PORTIONS OF THE FORECAST AREA.

WEDNESDAY THROUGH FRIDAY...
STRONG 1040MB+ HIGH IS EXPECTED TO BUILD INTO THE PLAINS WITH
RIDGING EXTENDING TOWARDS THE OHIO VALLEY BY THE END OF THE WEEK.
THIS SHOULD RESULT IN ANOTHER DRY PERIOD WITH WELL BELOW NORMAL
TEMPERATURES. UPPER AIR PATTERN BECOMES MORE ZONAL OVERHEAD WITH
SOME UNDULATIONS IN THE WEST COAST TROUGH...EVENTUALLY RESULTING IN
DOWNSTREAM AMPLIFICATION OF THE RIDGE ACROSS THE CENTRAL CONUS.

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