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UK AG Weather Center
Winter Precipitation Forecasting Checklist

SNOW DECISION CHECKLIST

These checklists are used to give the weather forecaster a quick and easy way to evaluate liquid vs. solid precipitation. Keep in mind these checklists are not all inclusive, further analysis is required to determine amount and duration of any expected signifigant weather event.

ITEM #1 ITEM #2 ITEM #3 ITEM #4

Surface Temp Surface Dewpoint 850mb Temp Freezing Level

<2.2 C (36F) <3C (37) < 0C (32F) < 1200 + or - 300

Yes / No Yes / No Yes / No Yes / No
If ITEM 1 through 4 are No, snow is extremely unlikely. If ITEM 1 through 4 are Yes, continue to the Detailed Snow Checklist

DETAILED SNOW CHECKLIST

PARAMETERS RAIN MIXED SNOW

Surface Temp > 37F 33F-36F <33F

Surface Dewpoint >38F 27F-37F <27F

850mb Temp >0C -2C-0C <-2C

850mb Dewpoint Dep **** -5C-0C

700mb Temp -6C <-5C

700mb Dewpoint Dep >-11C

500mb Temp N of 40'N <-29C

S of 40' N <-19C

1000-850mb >1325m 1300-1325m <1300m

1000-700mb >2870 2800-2870m <2800m

1000-500mb >5490m 5360-5490m <5360m

850-700mb >1555m 1520-1555m <1520m

FREEZING PRECIPITATION DECISION CKECKLIST

ITEM #1 ITEM #2 ITEM #3 ITEM #4 ITEM #5

Surface Temp Surface Temp/TD Spread Surface to <1200m Layer 1200m to >1600m Layer 1200 to <1600m Layer

< 1C < 8C >1C -1C -1C

Yes / No Yes / No Yes / No Yes / No Yes / No
If ITEM 1,2,3, and 5 are yes, sleet is likely (note: 1000-500mb thickness should be 5330-5410). If ITEM 1,2,3, and 4 are yes, complete the Detailed list.

DETAILED FREEZING PRECIPITATION CHECKLIST

PARAMETER IDEAL RANGE EXTREME RANGE

Surface Temp 0C to -4C 1C to -11C

Surface Dewpoint 0C to -5C 0C to -13C

Surface Temp/TD < 4C <8C

850mb Temp/TD < 2C < 7C

850mb Temp +1C to +6C -8C to +15C

1000-850mb 1300 to 1325m

1000-500mb 5330 to 5440m 5320 to 5520m

850-700mb Wind Direction 1540 to 1555m

If most parameters are in the ideal range, expect heavier amounts of freezing precipitation. If most parameters are in the extreme range, use the graph to determine the most likely precipitation.

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