Fall 2013 Frost/Freeze Information

Tracking Freezing Temperatures Across the Northern Plains:

With the approach of the autumnal equinox, freezing temperatures will begin to show up across the northern plains in the near future.  For detailed information and graphics on freeze conditions, please consult the Midwest Regional Climate Center (MRCC) by clicking HERE.

 The NWS in Aberdeen will issue several products to alert users for the potential for frost or freeze conditions. These products will be issued until the following:

1) a hard freeze occurs over a majority of the area

2) until October 15th (statistical end of the growing season)

 

Descriptions of the products are provided below: 

 


Freeze Watch: Issued when conditions are favorable for temperatures to fall below 32 degrees Fahrenheit during the next 12 to 48 hours resulting in the possibility for significant damage to unprotected vegetation.

Freeze Warning: Issued when confidence is high that temperatures will fall below 32 degrees Fahrenheit within the next 24 hours resulting in significant damage to unprotected vegetation.

Frost Advisory: Issued when conditions are favorable for temperatures to drop between 33 and 36 degrees Fahrenheit resulting in the possibility of widespread frost near the surface. Unprotected vegetation may be damaged.


The graphic and table below summarize the date when temperatures of a given threshold are expected to be reached.  Figure 1 depicts the median date of the first 32F temperature across the Midwest.  Table 1 provides a more in-depth listing of frost/freeze dates across several cities in the NWS Aberdeen forecast area – including dates of early (10th percentile) and late (90th percentile) freezes. 

For example, in Aberdeen:

·        The mean (or average) date when a low temperature is first expected to fall at or below 32F occurs on September 22nd.

·        An early 32F freeze (10th percentile) occurs around September 9th.

·        A late 32F freeze (90th percentile) occurs around October 2nd

  


Figure 1: 

http://www.crh.noaa.gov/images/abr/Frost_Freeze/frzmed_32_shd_Central.png

 

Table 1:  Statistical Frost/Freeze Dates

ABERDEEN

36F

32F

28F

24F

90th (Late)

24-Sep

2-Oct

13-Oct

24-Oct

10th (Early)

8-Sep

9-Sep

22-Sep

25-Sep

Median

16-Sep

22-Sep

1-Oct

9-Oct

Mean

17-Sep

22-Sep

2-Oct

12-Oct

         

PIERRE

36F

32F

28F

24F

90th (Late)

1-Oct

14-Oct

25-Oct

3-Nov

10th (Early)

11-Sep

19-Sep

24-Sep

30-Sep

Median

21-Sep

4-Oct

9-Oct

17-Oct

Mean

21-Sep

3-Oct

10-Oct

19-Oct

         

WATERTOWN

36F

32F

28F

24F

90th (Late)

24-Sep

3-Oct

12-Oct

30-Oct

10th (Early)

8-Sep

15-Sep

23-Sep

24-Sep

Median

16-Sep

24-Sep

3-Oct

10-Oct

Mean

17-Sep

23-Sep

3-Oct

12-Oct

         

MOBRIDGE/SELBY

36F

32F

28F

24F

90th (Late)

25-Sep

7-Oct

13-Oct

27-Oct

10th (Early)

2-Sep

12-Sep

20-Sep

26-Sep

Median

19-Sep

24-Sep

30-Sep

7-Oct

Mean

15-Sep

25-Sep

1-Oct

10-Oct

 

 

Mike Fowle - Science and Operations Officer

 



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