Chicago Weather O'Hare Data May 20 2014

20	23:51	W 5	6.00	Thunderstorm Heavy Rain Fog/Mist	BKN038CB OVC050	69	65			87%	NA	NA	29.84	1010.1	0.39
20	22:51	S 7	10.00	Overcast	OVC050	68	62			81%	NA	NA	29.83	1009.7	0.26
20	21:51	S 5	10.00	Overcast	BKN055 BKN080 BKN140 OVC200	67	60			79%	NA	NA	29.84	1010.0		0.05
20	20:51	SW 12 G 21	10.00	Thunderstorm	FEW043 SCT050CB BKN110	71	63			76%	NA	NA	29.84	1010.1	0.05
20	19:51	SE 10	10.00	Thunderstorm Light Rain	SCT065CB BKN110 OVC160	77	63			62%	NA	79	29.81	1009.2
20	18:51	SW 10	10.00	Overcast	FEW070 SCT120 BKN200 OVC250	82	61	85	82	49%	NA	83	29.81	1009.0
20	17:51	S 10	10.00	Mostly Cloudy	FEW055 SCT070 SCT150 BKN250	83	61			48%	NA	84	29.83	1009.5
20	16:51	SW 10	10.00	Mostly Cloudy	BKN060	84	61			46%	NA	84	29.83	1009.7
20	15:51	SW 13	10.00	Mostly Cloudy	BKN050 BKN300	85	62			46%	NA	86	29.83	1009.6
20	14:51	SW 10	10.00	Mostly Cloudy	SCT048 BKN300	83	61			48%	NA	84	29.84	1010.0
20	13:51	SW 10	10.00	Partly Cloudy	SCT046 SCT300	83	61			48%	NA	84	29.85	1010.4
20	12:51	SW 15	10.00	A Few Clouds	FEW042 FEW300	80	61			52%	NA	81	29.86	NA
20	11:51	W 13	10.00	A Few Clouds	FEW300	79	61			54%	NA	80	29.87	1011.0
20	10:51	SW 8 G 17	10.00	A Few Clouds	FEW250	77	60			56%	NA	79	29.86	1010.8
20	09:51	SW 14 G 22	10.00	Partly Cloudy	SCT250	73	58			59%	NA	NA	29.87	1011.2
20	08:51	SW 16 G 22	10.00	Partly Cloudy	SCT250	70	57			64%	NA	NA	29.88	1011.5
20	07:51	SW 12	10.00	Mostly Cloudy	BKN250	65	55			70%	NA	NA	29.88	1011.6
20	06:51	SW 16	10.00	Mostly Cloudy	FEW090 BKN250	64	53	65	62	68%	NA	NA	29.89	1011.9
20	05:51	S 13	10.00	Mostly Cloudy	BKN090 BKN250	63	51			65%	NA	NA	29.88	1011.5
20	04:51	S 15	10.00	Mostly Cloudy	BKN090	62	49			62%	NA	NA	29.88	1011.7
20	03:51	S 14	10.00	Mostly Cloudy	BKN250	63	47			56%	NA	NA	29.89	1011.9
20	02:51	S 14 G 22	10.00	A Few Clouds	FEW250	63	46			54%	NA	NA	29.89	1012.1
20	01:51	S 16 G 25	10.00	Partly Cloudy	FEW050 SCT110	64	44			48%	NA	NA	29.90	1012.2
20	00:51	S 18 G 23	10.00	Overcast	SCT037 BKN049 OVC110	65	43	68	63	45%	NA	NA	29.94	1013.5

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

DAY 1 CONVECTIVE OUTLOOK  
   NWS STORM PREDICTION CENTER NORMAN OK
   1125 AM CDT TUE MAY 20 2014

   VALID 201630Z - 211200Z

   ...THERE IS A SLGT RISK OF SVR TSTMS FROM ERN IA INTO NWRN OH...

   ...THERE IS A SLGT RISK OF SVR TSTMS OVER PARTS OF SERN WY...NERN
   CO...AND THE NEB PNHDL...

   ...SUMMARY...
   SEVERE THUNDERSTORMS WITH THE POTENTIAL TO PRODUCE DAMAGING
   WINDS...LARGE HAIL...AND A COUPLE OF TORNADOES...ARE EXPECTED TO
   DEVELOP LATE THIS AFTERNOON AND EARLY EVENING FROM EASTERN IOWA TO
   THE WISCONSIN/ILLINOIS BORDER. STORM WILL PROGRESS EASTWARD ACROSS
   SOUTHERN LAKE MICHIGAN...NORTHERN INDIANA...SOUTHERN LOWER
   MICHIGAN...AND NORTHWEST OHIO THROUGH THE EVENING AND OVERNIGHT.

   ISOLATED TO SCATTERED LATE AFTERNOON AND EVENING STORMS ARE POSSIBLE
   ALONG AND EAST OF THE FRONT RANGE OF THE ROCKIES FROM SOUTHEAST
   WYOMING TO NORTHEAST COLORADO. SOME STORMS MAY PRODUCE HAIL AND HIGH
   WINDS.

   ...IA/WI INTO OH...
   BROAD ANTICYCLONIC UPPER FLOW IS PRESENT TODAY OVER THE
   CENTRAL/EASTERN UNITED STATES...WITH SEVERAL SHORTWAVE TROUGHS
   MOVING FROM THE CENTRAL ROCKIES INTO THE OH VALLEY.  AT THE
   SURFACE...A WARM FRONT EXTENDS FROM A LOW OVER KS INTO IA/WI...THEN
   SOUTHEASTWARD INTO OH.  WARM AND INCREASINGLY MOIST AIR IS SOUTH OF
   THE BOUNDARY WITH DEWPOINTS IN THE LOWER 60S AND AFTERNOON
   TEMPERATURES EXPECTED TO CLIMB WELL INTO THE 80S.  RESULTANT MLCAPE
   VALUES THIS AFTERNOON WILL RANGE FROM 1500-2000 J/KG.  MODELS ARE
   CONSISTENT IN DEVELOPING SCATTERED THUNDERSTORMS LATE THIS AFTERNOON
   ALONG THE BOUNDARY FROM SOUTH CENTRAL IA INTO SOUTHERN WI.  FORECAST
   SOUNDINGS IN THIS AREA SHOW SUFFICIENT VERTICAL SHEAR FOR ROTATING
   STORMS CAPABLE OF LARGE HAIL AND DAMAGING WINDS.  STORMS ARE LIKELY
   TO INCREASE IN COVERAGE THROUGH THE EVENING AND SPREAD EASTWARD INTO
   PARTS OF IL/IND AND WESTERN OH WITH A RELATIVELY CONCENTRATED AREA
   OF SEVERE REPORTS POSSIBLE.  EARLIER CONFIDENCE IN UPSCALE
   ORGANIZATION INTO A MORE INTENSE SEVERE WIND EVENT FARTHER EAST HAS
   SOMEWHAT DIMINISHED...BUT REMAINS A CONCERN THAT WILL BE MONITORED
   IN LATER UPDATES.

   ...WY/NEB/CO...
   SIMILAR TO YESTERDAY...ISOLATED THUNDERSTORMS ARE EXPECTED TO
   DEVELOP LATER TODAY OVER PARTS OF SOUTHEAST WY AND NORTHEAST CO. 
   STORMS WILL BE SPARSE IN COVERAGE...BUT SUFFICIENT VERTICAL SHEAR
   MAY RESULT IN SUPERCELLS CAPABLE OF LARGE HAIL AND DAMAGING WINDS. 
   LIMITED LOW LEVEL MOISTURE SHOULD PRECLUDE A MORE WIDESPREAD OR
   ORGANIZED SEVERE EVENT.

   ..HART/SMITH.. 05/20/2014

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