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December 29-31st 2 Clipper Potentials


dmc76

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0z ECMWF...

CID:

 
FRI 06Z 30-DEC   3.4	 2.0    1004	  88	  99    0.03	 547	 544   
FRI 12Z 30-DEC   4.2	 0.4	 999	  94	  99    0.15	 542	 542   
FRI 18Z 30-DEC   2.7    -1.6    1003	  97	  96    0.19	 541	 539   
SAT 00Z 31-DEC   2.1    -1.9    1011	  93	  85    0.05	 545	 536

DVN:

 
FRI 06Z 30-DEC   2.7	 3.2    1005	  88	  98    0.01	 548	 544   
FRI 12Z 30-DEC   4.5	 1.6    1000	  94	  99    0.12	 543	 543   
FRI 18Z 30-DEC   5.7    -0.3    1000	  95	 100    0.11	 540	 540   
SAT 00Z 31-DEC   1.8    -2.4    1009	  96	  98    0.12	 544	 537   
SAT 06Z 31-DEC  -0.5    -1.8    1014	  94	  14    0.01	 550	 539

LSE:

 
FRI 12Z 30-DEC  -0.3	 0.2    1004	  82	  95    0.02	 542	 538   
FRI 18Z 30-DEC   0.1    -2.0    1006	  80	  99    0.08	 541	 536   
SAT 00Z 31-DEC  -0.9    -2.3    1011	  77	  98    0.03	 543	 534

MSN:

 
FRI 12Z 30-DEC   0.3	 0.4    1005	  90	  98    0.03	 543	 539   
FRI 18Z 30-DEC   0.9    -1.3    1004	  96	  99    0.25	 541	 538   
SAT 00Z 31-DEC  -0.5    -2.4    1009	  81	  96    0.15	 543	 536 

MKE:

 
FRI 18Z 30-DEC   2.2    -1.1    1003	  98	  99    0.20	 541	 539   
SAT 00Z 31-DEC   1.0    -2.0    1007	  94	  97    0.24	 542	 537   
SAT 06Z 31-DEC  -0.4    -0.8    1011	  87	  78    0.01	 545	 536

SBM:

 
FRI 18Z 30-DEC   1.3    -1.2    1006	  86	  99    0.02	 542	 537   
SAT 00Z 31-DEC   0.5    -1.8    1008	  85	  98    0.08	 542	 536

PIA:

 
FRI 12Z 30-DEC   6.2	 3.1    1001	  90	  91    0.07	 545	 544   
FRI 18Z 30-DEC   7.0    -0.5	 999	  93	  94    0.05	 540	 541   
SAT 00Z 31-DEC   3.5    -1.8    1007	  95	  99    0.09	 544	 538   
SAT 06Z 31-DEC   2.2    -1.3    1014	  93	  63    0.02	 549	 538

DEC:

 
FRI 12Z 30-DEC   6.7	 4.7    1003	  90	  70    0.12	 548	 545   
FRI 18Z 30-DEC   7.1    -0.6    1001	  94	  97    0.09	 541	 540   
SAT 00Z 31-DEC   4.5    -2.0    1007	  94	  98    0.12	 544	 538   
SAT 06Z 31-DEC   3.1    -1.2    1013	  92	  69    0.03	 549	 538

ORD:

 
FRI 12Z 30-DEC   3.0	 0.4    1005	  94	  99    0.05	 546	 542   
FRI 18Z 30-DEC   5.7	 0.3    1000	  89	  87    0.20	 540	 540   
SAT 00Z 31-DEC   3.2    -0.6    1004	  96	  99    0.05	 542	 538   
SAT 06Z 31-DEC   0.8    -1.6    1011	  88	  81    0.02	 546	 537

MDW:

 
FRI 12Z 30-DEC   3.4	 1.0    1005	  92	  99    0.04	 547	 542   
FRI 18Z 30-DEC   6.4	 0.1    1000	  92	  91    0.19	 540	 540   
SAT 00Z 31-DEC   4.5    -0.5    1004	  97	  98    0.06	 542	 539   
SAT 06Z 31-DEC   1.5    -1.6    1011	  89	  84    0.02	 546	 537

VPZ:

 
FRI 12Z 30-DEC   3.1	 2.0    1006	  91	  99    0.04	 548	 543   
FRI 18Z 30-DEC   6.6    -0.1    1001	  96	  83    0.13	 541	 540   
SAT 00Z 31-DEC   6.1    -0.4    1002	  98	  99    0.09	 541	 539   
SAT 06Z 31-DEC   2.6    -1.5    1009	  95	  81    0.03	 545	 538   
SAT 12Z 31-DEC   0.2    -0.2    1016	  91	  53    0.01	 552	 539

LAF:

 
FRI 12Z 30-DEC   6.1	 3.9    1006	  82	  99    0.02	 550	 545   
FRI 18Z 30-DEC   7.6	 0.3    1001	  94	  93    0.10	 540	 540   
SAT 00Z 31-DEC   5.6    -0.9    1004	  95	  99    0.10	 542	 539   
SAT 06Z 31-DEC   3.6    -1.3    1010	  94	  84    0.06	 546	 538

IND:

 
FRI 12Z 30-DEC   6.0	 4.3    1008	  82	  80    0.03	 552	 546   
FRI 18Z 30-DEC   7.7	 1.3    1002	  96	  82    0.10	 543	 541   
SAT 00Z 31-DEC   5.9    -1.6    1005	  93	  98    0.11	 542	 538   
SAT 06Z 31-DEC   3.9    -0.8    1010	  96	  93    0.08	 546	 539   
SAT 12Z 31-DEC   2.6    -2.0    1017	  93	  53    0.01	 553	 540

OKK:

 
FRI 18Z 30-DEC   7.0	 1.1    1002	  95	  98    0.06	 542	 540   
SAT 00Z 31-DEC   6.0    -0.7    1003	  94	  97    0.11	 541	 538   
SAT 06Z 31-DEC   4.8    -0.6    1008	  98	  93    0.08	 545	 539   
SAT 12Z 31-DEC   2.0    -2.1    1016	  91	  58    0.01	 552	 539

FWA:

 
FRI 18Z 30-DEC   7.3	 2.3    1003	  88	  79    0.07	 544	 542   
SAT 00Z 31-DEC   6.4    -0.6    1002	  95	  97    0.15	 540	 538   
SAT 06Z 31-DEC   5.5    -0.5    1006	  97	  98    0.05	 543	 539   
SAT 12Z 31-DEC   2.7    -2.6    1014	  93	  68    0.01	 551	 539

HAO:

 
FRI 18Z 30-DEC  10.2	 3.6    1005	  76	  78    0.05	 549	 545   
SAT 00Z 31-DEC   8.0	 0.5    1006	  89	 100    0.12	 544	 539   
SAT 06Z 31-DEC   5.6    -1.7    1009	  91	  99    0.05	 545	 538   
SAT 12Z 31-DEC   4.3    -1.8    1015	  91	  75    0.01	 552	 540

DAY:

 
FRI 18Z 30-DEC   9.5	 3.2    1005	  77	  65    0.05	 549	 544   
SAT 00Z 31-DEC   7.3    -0.2    1006	  91	  99    0.22	 543	 539   
SAT 06Z 31-DEC   4.9    -1.6    1008	  94	  96    0.05	 544	 537   
SAT 12Z 31-DEC   3.8    -1.5    1014	  94	  76    0.03	 551	 539

CMH:

 
FRI 18Z 30-DEC   9.9	 3.2    1007	  68	  59    0.01	 551	 545   
SAT 00Z 31-DEC   8.3	 1.4    1006	  91	  91    0.12	 545	 540   
SAT 06Z 31-DEC   5.8    -1.9    1008	  91	  99    0.05	 543	 537   
SAT 12Z 31-DEC   5.0    -0.9    1012	  94	  82    0.03	 549	 539   
SAT 18Z 31-DEC   5.5    -2.4    1018	  81	  44    0.01	 557	 542

TDZ:

 
FRI 18Z 30-DEC   6.1	 2.1    1006	  87	  62    0.03	 548	 543   
SAT 00Z 31-DEC   7.9	 0.4    1003	  93	  92    0.17	 542	 539   
SAT 06Z 31-DEC   5.9    -0.5    1004	  96	  99    0.09	 540	 537   
SAT 12Z 31-DEC   3.2    -0.8    1011	  93	  82    0.05	 548	 538

CLE:

 
FRI 18Z 30-DEC   6.6	 2.3    1008	  74	  87    0.01	 550	 544   
SAT 00Z 31-DEC   7.0	 2.3    1005	  87	  82    0.11	 544	 541   
SAT 06Z 31-DEC   6.1    -1.1    1005	  90	  93    0.04	 541	 537   
SAT 12Z 31-DEC   4.9    -0.4    1009	  96	  94    0.05	 545	 537   
SAT 18Z 31-DEC   3.6    -1.4    1016	  92	  54    0.03	 553	 540   
SUN 00Z 01-JAN   3.8	 2.1    1019	  90	  11    0.01	 562	 547

MKG:

 
FRI 18Z 30-DEC   2.8    -0.6    1004	  90	  99    0.06	 543	 539   
SAT 00Z 31-DEC   1.8    -1.1    1005	  96	  90    0.24	 541	 537   
SAT 06Z 31-DEC   1.4    -1.7    1008	  92	  85    0.03	 544	 537

GRR:

 
FRI 18Z 30-DEC   2.5    -0.3    1005	  95	  96    0.06	 544	 540   
SAT 00Z 31-DEC   2.1    -0.6    1004	  99	  96    0.25	 541	 537   
SAT 06Z 31-DEC   1.1    -1.5    1007	  97	  83    0.05	 543	 537

BTL:

 
FRI 18Z 30-DEC   3.8	 0.7    1004	  95	  80    0.11	 544	 541   
SAT 00Z 31-DEC   4.1    -0.1    1002	  99	  98    0.22	 540	 538   
SAT 06Z 31-DEC   1.7    -0.9    1007	  98	  92    0.06	 543	 537

ADG:

 
FRI 18Z 30-DEC   4.9	 1.2    1005	  92	  72    0.05	 546	 542   
SAT 00Z 31-DEC   6.5	 0.4    1002	  97	  94    0.19	 541	 539   
SAT 06Z 31-DEC   5.1	 0.0    1004	  98	  93    0.11	 541	 537   
SAT 12Z 31-DEC   2.0    -1.5    1012	  93	  76    0.01	 548	 538

DTW:

 
FRI 18Z 30-DEC   4.2	 0.5    1007	  91	  96    0.02	 547	 542   
SAT 00Z 31-DEC   5.3	 0.9    1003	  95	  94    0.20	 542	 539   
SAT 06Z 31-DEC   5.3    -0.1    1003	  97	  95    0.10	 540	 538   
SAT 12Z 31-DEC   2.9    -0.2    1010	  94	  80    0.03	 547	 538

PHN:

 
SAT 00Z 31-DEC   3.3	 0.1    1006	  94	 100    0.14	 543	 538   
SAT 06Z 31-DEC   3.8	 0.1    1004	  98	  96    0.13	 541	 538   
SAT 12Z 31-DEC   3.1	 0.0    1009	  96	  90    0.03	 545	 538

YKF:

 
SAT 00Z 31-DEC   1.6	 0.1    1009	  97	  91    0.05	 546	 539   
SAT 06Z 31-DEC   1.2	 0.0    1006	  99	  92    0.13	 542	 537   
SAT 12Z 31-DEC   1.0    -0.6    1008	  99	 100    0.04	 543	 537   
SAT 18Z 31-DEC   4.5	 0.1    1013	  81	  70    0.02	 549	 539

YYZ:

    
SAT 00Z 31-DEC   2.5    -0.4    1010	  96	  98    0.04	 547	 539   
SAT 06Z 31-DEC   2.4    -0.2    1007	  95	  89    0.15	 543	 537   
SAT 12Z 31-DEC   2.2    -0.6    1008	  98	  99    0.04	 543	 536   
SAT 18Z 31-DEC   3.7	 0.0    1012	  84	  73    0.02	 548	 538

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NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI

1149 PM CST THU DEC 29 2011

.UPDATE...

PCPN TRENDS OVER IA AGREE WITH THE SLOWER PROGRESSION AS IT MOVES

INTO SRN WI DURING THE OVERNIGHT SO MADE THOSE ADJUSTMENTS AND

CONTINUED PCPN LONGER FOR FRIDAY. OTHERWISE FCST SOUNDINGS SUGGEST

MAINLY SNOW NORTH OF A LINE FROM LONE ROCK TO MADISON TO NEAR PORT

WASHINGTON AS WET BULB TEMPS REMAIN JUST BELOW FREEZING. TO THE

SOUTH A MIXTURE OF FREEZING RAIN...SNOW AND SLEET WITH A WINTER WX

ADVISORY IN EFFECT FOR

LAFAYETTE...IOWA...DANE...GREEN...JEFFERSON...AND ROCK COUNTIES.

SFC TEMPS WILL REMAIN AT OR BELOW FREEZING POSSIBLY THROUGH MID

MORNING. EXPECTED ICE ACCUMS COULD REACH ONE TENTH OF AN INCH WITH

1-2 INCHES OF SNOW. FARTHER EAST...MUCH LESS ICE AND BETTER

CHANCES OF RAIN AS WINDS COME OFF THE RELATIVELY WARM WATERS OF

LAKE MI.

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Definitely under guidance but it could come up pretty fast when the inversion mixes out.

The lake is gonna be a major problem for the Chicago/Milwaukee areas anyways, the east winds will kick up as this comes in.

Further inland, the inversion will mix out, but things may stay below freezing. 30.6 °F on top of the met building, so the near sfc freezing layer is pretty thick, and could hold its own for awhile even w/ warmer air aloft. Temps at 850 hPa are already up to 3-4 °C, so we're likely to start with freezing rain and maybe some sleet. CAA at 850 hPa should start soon after the onset of precip, and eventually it'll go over to snow. The perfect recipe to ruin the roads.

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Geez UGN down to 25/25, this could be trouble.

There's a fog/haze hanging low to the ground here. I think icy roads are a given around here for a little while at least once the precipitation moves in. They might be slicking up already with this fog.

Local forecast calling for snow and freezing rain in a couple hours, then to rain/snow mix. Best chance for sticking snow after the winds switch offshore.

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Coming up on 1 hour of freezing rain, temperature of 29 °F on top of the met building. Ice accretion is occurring on every surface, and there's almost a solid coating now. The sidewalk isn't a slip n slide yet, but you can definitely slide along it. A band of 35 dBZ echoes is moving in, and the rain has been getting heavier. No ice pellets anymore as far as I can tell.

This is all very fascinating to me since I've never seen an ice storm before. Even at this early point we've got more freezing rain than I've ever seen in Madison.

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Road issues are likely before it gets above freezing after sunrise sometime.

as of 5 am:

ILZ005-006-012>014-019>023-301200-

NORTHEAST ILLINOIS

CITY SKY/WX TMP DP RH WIND PRES REMARKS

OHARE LGT RAIN 38 35 89 E7 29.65F

MIDWAY LGT RAIN 39 34 82 E6 29.66F

AURORA LGT RAIN 37 33 85 E10 29.61F

LANSING* LGT RAIN 37 35 93 SE6 29.66F

JOLIET* LGT RAIN 38 33 81 E9 29.62F

WAUKEGAN LGT RAIN 37 35 92 E7 29.66F FOG

WEST CHICAGO LGT RAIN 36 32 85 E8 29.63F

KANKAKEE* LGT RAIN 39 37 93 E8 29.64F

WHEELING LGT RAIN 38 35 89 SE3 29.68F FOG

MORRIS* RAIN 38 36 93 E7 29.61F

ROMEOVILLE* LGT RAIN 38 36 92 E9 29.63F

:underthewx:

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