Winter Weather Outlook: Confidence levels

A Quick Guide to the Percentages

Storm Forecast Verification (with 24hr lead)

2008-09 Snow Report


10/28/2008	T		OCT: T
11/18/2008	T
11/22/2008	T
11/24/2008	0.1
11/28/2008	0.1
11/30/2008	1.2		NOV: 1.4
12/07/2008	0.5
12/09/2008	1.4
12/12/2008	1.0	E,C,C
12/13/2008	T
12/17/2008	3.6	C
12/19/2008	8.6	C
12/20/2008	2.5
12/21/2008	7.4	D
12/31/2008	8.7		DEC: 33.7
01/05/2008	T	D
01/07/2009	3.5	C
01/08/2009	3.8
01/11/2009	7.8
01/18/2009	5.0
01/19/2009	2.0
01/28/2009	9.1	C	JAN: 31.2
02/13/2009	T
02/19/2009	4.8
02/20/2009	1.0
02/22/2009	6.2		FEB: 12.0
03/02/2009	4.5	C
03/09/2009	6.3		MAR: 10.8

-----------------------------------------
Total so far	89.2
(Highest snowdepth recorded so far: 24)

2007-08 Snow Report


11/16/2007	T
11/20/2007	2.2
11/26/2007	T		NOV: 2.2
12/01/2007	0.1
12/03/2007	7.0	C
12/07/2007	T
12/10/2007	1.0	D
12/13/2007	7.6
12/16/2007	10.1	D
12/20/2007	3.3	D	
12/27/2007	1.2		
12/31/2007	9.4		DEC: 39.7
01/01/2008	5.5
01/11/2008	T	D
01/14/2008	5.1	C
01/18/2008	3.3	C
01/21/2008	0.5		
01/23/2008	0.1		
01/27/2008	1.5		JAN: 16.0
02/01/2008	2.5	E	
02/05/2008	1.0	D	
02/07/2008	2.5	D	
02/10/2008	5.0		
02/13/2008	8.2	C	
02/18/2008	T	D
02/19/2008	T
02/22/2008	4.5
02/26/2008	9.6
02/27/2008	0.3		FEB: 33.4
03/01/2008	4.7
03/09/2008	T
03/12/2008	0.5
03/15/2008	1.5
03/19/2008	0.6
03/28/2008	5.4	C
03/31/2008	1.0		MAR: 13.7
04/04/2008	1.2		APR: 1.2

-----------------------------------------
Total		106.4
(Seasonal average reached on 2/13/08)
(Highest snowdepth recorded: 28)

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Updated at 10:55EDT 4/15

Short term Winter threat Fri-Sun 4/16-18 40% chance of a winter event 10% chance of a severe winter event	Long term Winter threat None 0% chance of a winter event 0% chance of a severe winter event
Snowday probabilities1 Friday 4/16 20% chance of a delay 0% chance of an early dismissal 0% chance of a cancellation	Snowday probabilities2 None 0% chance of a delay 0% chance of an early dismissal 0% chance of a cancellation

Snowday probabilities are made by Sam Lillo, for SAU29 in Keene. These percentages should not be relied on outside of Cheshire County, NH. In addition, in Cheshire County, please do all school work on time depsite the issued forecast.

Confidence levels

Posted: 2/12/2007 03:03:00 PM

Yeah, Im in school right now, but it's lunch time.

Anyway
confidence levels:
All snow, no mix: 95%
>1.00" water equivalent: 85%
>2.00" water equivalent: 30%
>12:1 snow to water ratios: 65%
>1.0" snow accumulation: 95%
>6.0" snow accumulation: 85%
>12.0" snow accumulation: 75%
>18.0" snow accumulation: 60%
>24.0" snow accumulation: 35%

Dropping snow accumulation forecast for Keene, NH for 12z Tuesday through 12z Thursday (issued at 1200 2/12): 12 to 18 inches.

Energy in the GOM has been underestimated by the models. This could mean if it phases with the northern jet, even more moisture and snowfall. However, it could also pull moisture away if it goes east. Another variable in the forecast.

|posted by Sam Lillo @ 2/12/2007 03:03:00 PM

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(c) 2005-10, Sam Lillo. The forecasts made on this site are unofficial and should not be relied on in life-threatening situations. For official forecasts, consult the National Weather Service.