Snowflake Images and Data

Snowflake Images and Data 2004/05

Snow Event Date	Snowflake Images	Snowflake Types	Conditions (a)	Conditions (b)
121304	Pogue	stellar dendrites, spatial dendrites	n/a	n/a
122204	McCollum	needles, bullets, hollow columns	Weather Data	Skew-T
122204	McCollum	capped columns, plates	Weather Data	Skew-T
122204	Andrew	stellar dendrites	Weather Data	Skew-T
010605	Pogue	sectored plates	Weather Data	Skew-T
010705	McCollum	stellar dendrites	Weather Data	Skew-T
011305	McCollum	needles	Weather Data	n/a
011305	Pogue	needles	Weather Data	n/a
011505	Pogue	sectored plates, plates	Weather Data	Skew-T
011505	McCollum	sectored plates, stellar dendrites, plates	Weather Data	Skew-T
012205	Pogue	sectored plates, stellar dendrites, plates	Weather Data	Skew-T
012205	McCollum	sectored plates, stellar dendrites, plates	Weather Data	Skew-T
021005	Pogue	sectored plates, stellar dendrites, rimed crystrals, plates	Weather Data	Skew-T
021005	McCollum	sectored plates, stellar dendrites, rimed crystrals, plates	Weather Data	Skew-T
030105	Pogue	rimed crystals, stellar dendrites, sectored plates	Weather Data	Skew-T
030105	McCollum	stellar dendrites, sectored plates	Weather Data	Skew-T

Snowflake Images and Data 2005/06

Snow Event Date	Snowflake Images	Snowflake Types	Conditions (a)	Conditions (b)
120605	Pogue	sectored plates, rimed crystrals	Weather Data	Skew-T
120805	McCollum	sectored plates, stellar dendrites, rimed crystrals	Weather Data	Skew-T
120805	Pogue	capped column	Weather Data	Skew-T
121805	Pogue	plates, sectored plates, stellar dendrites, rimed crystrals	Weather Data	Skew-T
121805	McCollum	sectored plates, stellar dendrites, rimed crystrals	Weather Data	Skew-T

Snowflake Images and Data 2006/07

Snow Event Date	Snowflake Images	Snowflake Types	Conditions (a)	Conditions (b)
011507	McCollum	rimed crystrals, sectored plates	Weather Data	Skew-T
011607	McCollum	sectored plates, stellar dendrites	n/a	Skew-T
020107	McCollum	rimed crystral	Weather Data	Skew-T
020207	Pogue	needles, stellar dendrites	n/a	n/a
020307	McCollum	sectored plate	n/a	n/a
020607	McCollum	sectored plates, rimed crystrals	Weather Data	Skew-T
020707	Pogue	capped columns, rimed crystals, plates, stellar plates	n/a	n/a
021307	McCollum	irregular, rimed crystals, stellar plates, sectored plates, stellar dendrites	Weather Data	Skew-T
021707	McCollum	plates, stellar plates, rimed crystals	Weather Data	Skew-T
030307	McCollum	stellar dendrites, stellar plates, sectored plates	n/a	n/a

Snowflake Images and Data 2007/08

Snow Event Date	Snowflake Images	Snowflake Types	Conditions (a)	Conditions (b)
120607	McCollum	needles, hexagonal plates, bullet rosettes, hollow columns	Weather Data	Skew-T
121507	McCollum	needles, plates, triagular forms	n/a	n/a
122707	Pennycook	rimed crystals, stellar dendrites (Ross Island, Antarctica)	-2.9 C	n/a
010108	Pogue	stellar dendrites, simple stars, sectored plates	Weather Data	Skew-T
010208	McCollum	stellar dendrites, simple stars, hexagonal plate, hollow column	Weather Data	Skew-T
013108	McCollum	needles, rimed crystals	Weather Data	Skew-T
020108	McCollum	sectored plates, stellar dendrites, simple star	Weather Data	Skew-T
021108	Pogue	sectored plates, rimed crystals, hexagonal plates	n/a	n/a
021308	McLellan	stellar dendrites, sectored plates, capped columns, triangle ( Andover, MN)	18 F	n/a
022108	McCollum	stellar dendrites	Weather Data	Skew-T
022208	McCollum	hexagonal plates, stellar plates, hollow columns, needles	n/a	n/a
022208	Pogue	capped columns	n/a	n/a

Snowflake Images and Data 2008/09

Snow Event Date	Snowflake Images	Snowflake Types	Conditions (a)	Conditions (b)
121208	McCollum	sectored plates	Weather Data	Skew-T
121608	McCollum	sectored plates, needles, capped columns, hollow columns, rimed crystals	Weather Data	Skew-T
123108	McCollum	stellar dendrites, simple star	Weather Data	Skew-T
010709	McCollum	hexagonal plates	Weather Data	n/a
010809	McCollum	stellar dendrites, simple stars	Weather Data	Skew-T
011309	McCollum	stellar dendrites, sectored plates, simple stars	Weather Data	Skew-T
012609	McCollum	stellar dendrites	Weather Data	Skew-T
012709	McCollum	stellar dendrites, sectored plates, hexagonal crystals, rimed crystals	Weather Data	Skew-T

Snowflake Images and Data 2009/10

Snow Event Date	Snowflake Images	Snowflake Types	Conditions (a)	Conditions (b)
010710	McCollum	stellar dendrites, stellar plates, sectored plates, hexagonal plates, triangles	Weather Data	Skew-T
010810	Pogue	sectored plates	Weather Data	Skew-T
020510	McCollum	needles	Weather Data	Skew-T
021410	McCollum	stellar dendrites, sectored plates, capped columns, simple stars	n/a	n/a
021510	McCollum	hexagonal plates	n/a	n/a

Snowflake Images and Data 2010/11

Snow Event Date	Snowflake Images	Snowflake Types	Temperature	Humidity
120310	McCollum	bullet rosettes	30 F	85%
120410	McCollum	stellar dendrites, stellar plates, sectored plates, rimed crystals	28 F	92%
120610	Pogue	stellar dendrites, rimed crystals	18 F	79%
121210	McCollum	stellar dendrites	18 F	89%
122410	McCollum	stellar dendrites	30 F	90%

a. Weather data reported from Davis Vantage Pro weather station located on rooftop at Charleston Middle School (list of daily averages when hourly station data was not available)

b. Central Illinois skewed temperature plots reported by National Weather Service, Lincoln, IL (red line represents dry air temperature, blue line represents dew point)

n/a = not available