Point Forecast: Ashburn VA  39.05N 77.49W (Elev. 299 ft)	Last Update: 1:30 pm EDT May 17, 2024

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Weather Elements Fire Weather Aviation Weather Temperature (°F) Dewpoint (°F) Heat Index (°F) Surface Wind  ktmphkm/hm/s Sky Cover (%) Precipitation Potential (%) Relative Humidity (%) Rain Thunder Fog Mixing Height  x100ftx100m Haines Index Lightning Activity Level Trans. Wind  ktmphkm/hm/s Vent Rate (x1000 mph-ft) Atmospheric Dispersion Index Low Visibility Occurrence Risk Index Ceiling Height Visibility

48-Hour Period Starting: 3pm Fri, May 17 20244pm Fri, May 17 20245pm Fri, May 17 20246pm Fri, May 17 20247pm Fri, May 17 20248pm Fri, May 17 20249pm Fri, May 17 202410pm Fri, May 17 202411pm Fri, May 17 202412am Sat, May 18 20241am Sat, May 18 20242am Sat, May 18 20243am Sat, May 18 20244am Sat, May 18 20245am Sat, May 18 20246am Sat, May 18 20247am Sat, May 18 20248am Sat, May 18 20249am Sat, May 18 202410am Sat, May 18 202411am Sat, May 18 202412pm Sat, May 18 20241pm Sat, May 18 20242pm Sat, May 18 20243pm Sat, May 18 20244pm Sat, May 18 20245pm Sat, May 18 20246pm Sat, May 18 20247pm Sat, May 18 20248pm Sat, May 18 20249pm Sat, May 18 202410pm Sat, May 18 202411pm Sat, May 18 202412am Sun, May 19 20241am Sun, May 19 20242am Sun, May 19 20243am Sun, May 19 20244am Sun, May 19 20245am Sun, May 19 20246am Sun, May 19 20247am Sun, May 19 20248am Sun, May 19 20249am Sun, May 19 202410am Sun, May 19 202411am Sun, May 19 202412pm Sun, May 19 20241pm Sun, May 19 20242pm Sun, May 19 20243pm Sun, May 19 20244pm Sun, May 19 20245pm Sun, May 19 20246pm Sun, May 19 20247pm Sun, May 19 20248pm Sun, May 19 20249pm Sun, May 19 202410pm Sun, May 19 202411pm Sun, May 19 202412am Mon, May 20 20241am Mon, May 20 20242am Mon, May 20 20243am Mon, May 20 20244am Mon, May 20 20245am Mon, May 20 20246am Mon, May 20 20247am Mon, May 20 20248am Mon, May 20 20249am Mon, May 20 202410am Mon, May 20 202411am Mon, May 20 202412pm Mon, May 20 20241pm Mon, May 20 20242pm Mon, May 20 20243pm Mon, May 20 20244pm Mon, May 20 20245pm Mon, May 20 20246pm Mon, May 20 20247pm Mon, May 20 20248pm Mon, May 20 20249pm Mon, May 20 202410pm Mon, May 20 202411pm Mon, May 20 202412am Tue, May 21 20241am Tue, May 21 20242am Tue, May 21 20243am Tue, May 21 20244am Tue, May 21 20245am Tue, May 21 20246am Tue, May 21 20247am Tue, May 21 20248am Tue, May 21 20249am Tue, May 21 202410am Tue, May 21 202411am Tue, May 21 202412pm Tue, May 21 20241pm Tue, May 21 20242pm Tue, May 21 20243pm Tue, May 21 20244pm Tue, May 21 20245pm Tue, May 21 20246pm Tue, May 21 20247pm Tue, May 21 20248pm Tue, May 21 20249pm Tue, May 21 202410pm Tue, May 21 202411pm Tue, May 21 202412am Wed, May 22 20241am Wed, May 22 20242am Wed, May 22 2024

Date	05/17									05/18
Hour (EDT)	15	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14
Temperature (°F)	73	73	73	72	70	69	66	65	64	63	63	62	61	61	60	59	60	60	60	60	60	61	61	61
Dewpoint (°F)	60	60	60	60	61	60	60	60	59	59	59	59	59	59	59	59	59	59	59	59	59	58	58	58
Heat Index (°F)
Surface Wind (mph)	6	6	8	7	7	7	7	7	7	7	7	7	6	6	6	6	7	7	7	7	8	8	8	8
Wind Dir	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	E	SE	SE	E	E	E	E
Gust
Sky Cover (%)	89	92	94	93	92	100	100	100	100	100	100	100	100	100	100	100	100	98	98	99	99	99	98	98
Precipitation Potential (%)	10	17	34	42	42	39	38	38	38	49	59	71	77	80	87	88	92	83	83	83	77	77	77	61
Relative Humidity (%)	64	64	64	66	73	73	81	84	84	87	87	90	93	93	96	100	96	96	96	96	96	90	90	90
Rain	--	SChc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Lkly	Lkly	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Lkly
Thunder	--	--	--	--	--	SChc	SChc	SChc	SChc	SChc	SChc	SChc	SChc	SChc	--	--	--	--	--	--	--	--	--	--
Date										05/19
Hour (EDT)	15	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14
Temperature (°F)	62	62	62	63	62	62	61	61	60	59	59	59	59	58	58	58	58	59	61	63	65	67	69	71
Dewpoint (°F)	58	58	58	58	58	57	58	57	57	57	57	57	57	56	56	56	57	58	59	59	59	59	58	58
Heat Index (°F)
Surface Wind (mph)	8	8	8	8	7	7	7	6	6	5	5	5	5	5	6	6	6	7	7	8	8	8	9	9
Wind Dir	E	E	E	E	E	E	E	E	E	E	E	E	E	E	NE	NE	NE	NE	NE	NE	NE	NE	NE	NE
Gust
Sky Cover (%)	97	98	98	97	96	96	95	96	96	95	94	94	94	95	95	93	89	79	76	73	71	69	67	63
Precipitation Potential (%)	61	61	41	41	41	32	32	32	32	32	32	23	23	23	23	23	23	19	19	19	19	19	19	12
Relative Humidity (%)	87	87	87	84	87	84	90	87	90	93	93	93	93	93	93	93	96	96	93	87	81	75	68	63
Rain	Lkly	Lkly	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	Chc	SChc	SChc	SChc	SChc	SChc	SChc	SChc	SChc	SChc	SChc	SChc	SChc	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--

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