WPC Verification

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QPF's: 24-Hourly 6-Hourly Days 4-5 5-Day Total
Medium Range: Min Temps Max Temps Prob of Pcpn (PoP) WPC Grids Sea-level Pressure

Quantitative Precipitation Forecasts

How Threat Scores and Bias are Computed

24-Hourly QPF's

Monthly Record Threat Scores

Annual WPC Day-1 / Update / Day-2 Threat Scores and Observed Areal Coverage; Annual WPC Day-1 / Day-2 Bias

.50 inch (1972-2016)	1.00 inch (1965-2016)	2.00 inches (1970-2016)
Threat Bias	Threat Bias	Threat Bias

Annual WPC -vs- NWP Guidance Threat Scores 1993-2016

	1.00 inch
Day 1	Threat

Monthly WPC -vs- NWP Guidance Threat Scores and Bias June 2016 to June 2017

	.50 inch	1.00 inch	2.00 inches
Day 1	Threat Bias	Threat Bias	Threat Bias
Day 2	Threat Bias	Threat Bias	Threat Bias
Day 3	Threat Bias	Threat Bias	Threat Bias

Monthly WPC Threat Score and Bias Comparisons (.50", 1.00", 2.00") June 2016 to June 2017

Day 1	Day 2	Day 3
Threat Bias	Threat Bias	Threat Bias

Monthly WPC Threat Score and Bias Comparisons (Day 1 / Day 2 / Day 3) June 2016 to June 2017

.50 inch	1.00 inch	2.00 inches
Threat Bias	Threat Bias	Threat Bias

NAM and GFS QPF Verification by Region

6-Hourly QPF's

Monthly WPC -vs- NWP Guidance Threat Scores Update June 2016 to June 2017

00-06 Hours

.25 inch

.50 inch

Monthly WPC -vs- NWP Guidance Threat Scores Day 1 June 2016 to June 2017

06-12 Hours	.25 inch	.50 inch
12-18 Hours	.25 inch	.50 inch
18-24 Hours	.25 inch	.50 inch
24-30 Hours	.25 inch	.50 inch

Monthly WPC -vs- NWP Guidance Threat Scores Day 2 June 2016 to June 2017

30-36 Hours	.25 inch	.50 inch
36-42 Hours	.25 inch	.50 inch
42-48 Hours	.25 inch	.50 inch
48-54 Hours	.25 inch	.50 inch

Monthly WPC -vs- NWP Guidance Threat Scores Day 3 June 2016 to June 2017

54-60 Hours	.25 inch	.50 inch
60-66 Hours	.25 inch	.50 inch
66-72 Hours	.25 inch	.50 inch
72-78 Hours	.25 inch	.50 inch

Days 4-5 QPF's

Monthly WPC -vs- NWP Guidance Threat Scores and Bias June 2016 to June 2017

.50 inch	1.00 inch	2.00 inches
Threat Bias	Threat Bias	Threat Bias

Monthly WPC Threat Score and Bias Comparisons .50", 1.00", 2.00" June 2016 to June 2017

Threat

Bias

5-Day Total QPF's

Monthly WPC -vs- NWP Guidance Threat Scores and Bias June 2016 to June 2017

.50 inch	1.00 inch	2.00 inches	3.00 inches	4.00 inches
Threat Bias	Threat Bias	Threat Bias	Threat Bias	Threat Bias