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StormTracker blog

A mix of sun and clouds developing today with a high in the upper 70s to low 80s. The wind south at 10-20 mph (a bit lighter this morning). Scattered Thunderstorms redeveloping this afternoon and evening. Some storms may be locally severe. Tonight, some scattered thunderstorms with a low in mid to upper 50s. On and off again showers expected Sunday through Tuesday with cooler temperatures.

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December 11, 2012

Temperature   Observed Time Record Year Normal Normal Departure Last Year High 13° 301 PM 54° 1939 24° -11° 45° Low 1° 737 PM -21° 1945 7° -6° 19° Average 7°       15° -8° 32°
Precipitation   Observed Record Year Normal Normal Departure Last Year Precipitation T 0.67 1949 0.02 -0.02 0.00 Month to Date 0.14 0.29     -0.15 0.01 SINCE DEC 1 0.14 0.29     -0.15 0.01 Since Jan. 1 14.29 22.07     -7.78 23.60
Snow   Observed Record Year Normal Normal Departure Last Year Snowfall 0.1 5.7 1949 0.3 0.2 Month to Date 1.9     3.8 1.9 SINCE DEC 1 1.9     3.8 1.9 SINCE JUL 1 10.3     2.4 2.1 Snow Depth
Degree Days Heating   Observed Normal Normal Departure Last Year Heating 58 50 8 33 Month to Date 468 523 -55 485 SINCE DEC 1 468 523 -55 485 SINCE JUL 1 2377 2485 -108 2031
Degree Days Cooling   Observed Normal Normal Departure Last Year Cooling 0 0 0 0 Month to Date 0 0 0 0 SINCE DEC 1 0 0 0 0 SINCE JAN 1 795 551 244 694
Wind   Observed Highest Speed 3 Highest Direction 3 Highest Gust Speed 3 Highest Guest Direction 3	Relative Humidity   Observed Time Highest 3 3 Lowest 3 3 Average 3
Forecast Skycover POSSIBLE SUNSHINE: MM AVERAGE SKY COVER: 0.4 Conditions LIGHT SNOW HAZE	Climate Normals for Today   Average Record Year Temperature High 23° 55° 1883 Temperature Low 7° -23° 1893     December 12 2012 Sunrise 804 AM CST Sunset 438 PM CST December 13 2012 Sunrise 805 AM CST Sunset 439 PM CST
Source: National Weather Service Climate Report

Wind (mph)	Temperature (Fahrenheit)
0	35°	30°	25°	20°	15°	10°	5°	0°	-5°	-10°	-15°	-20°	-25°	-30°	-35°	-40°	-45°
5	31	25	9	13	7	-1	-5	-11	-16	-22	-28	-34	-40	-46	-52	-57	-72
10	27	21	15	9	3	-4	-10	-16	-22	-28	-35	-41	-47	-53	-59	-66	-77
15	25	19	13	6	0	-7	-13	-19	-26	-35	-39	-45	-51	-58	-64	-71	-81
20	24	17	11	4	-2	-9	-15	-22	-29	-35	-37	-44	-55	-61	-68	-74	-84
25	23	16	9	3	-4	-11	-17	-24	-31	-37	-44	-51	-58	-64	-71	-78	-87
30	22	15	8	1	-5	-12	-19	-26	-33	-39	-46	-53	-60	-67	-73	-80	-89
35	21	14	7	0	-7	-14	-21	-28	-34	-41	-48	-55	-62	-69	-76	-82	-91
40	20	13	6	-1	-8	-15	-22	-29	-36	-43	-50	-57	-64	-71	-78	-84	-93
45	19	12	5	-2	-9	-16	-23	-30	-37	-44	-51	-58	-65	-72	-79	-86	-93
50	19	12	4	-3	-10	-17	-24	-31	-38	-45	-52	-60	-67	-74	-81	-89	-95
55	18	11	4	-3	-11	-18	-25	-32	-39	-46	-54	-61	-68	-75	-82	-89	-97
60	17	10	3	-4	-11	-19	-26	-33	-40	-48	-55	-62	-69	-76	-84	-91	-98

	Increasing Danger (Frostbite in 30 min.)
	Heightened Danger (Frostbite in 10 min.)
	Great Danger (Frostbite in 5 min.)

Differences Between the new and old systems

• Wind speed is now calculated for 5 feet off the ground. Wind speed was previously based on observations at 33 feet.
• The calm wind threshold was lowered to 3mph.
• A consistent standard for skin tissue resistance is now in use.
• Measurements are based on how wind affects the human face, typically the most exposed portion of the body.
• The table incorporates the theory that heat is lost from the body depending on its surroundings
• The sun's impact is not factored into the wind chill temperature formula.