Point Forecast: Herndon PA  40.7N 76.88W (Elev. 482 ft)	Last Update: 7:15 am EDT Jun 19, 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 20ft Wind  ktmphkm/hm/s Vent Rate (x1000 mph-ft) Davis Stability Index Atmospheric Dispersion Index Low Visibility Occurrence Risk Index Ceiling Height Visibility Thunder Potential

48-Hour Period Starting: 10am Wed, Jun 19 202411am Wed, Jun 19 202412pm Wed, Jun 19 20241pm Wed, Jun 19 20242pm Wed, Jun 19 20243pm Wed, Jun 19 20244pm Wed, Jun 19 20245pm Wed, Jun 19 20246pm Wed, Jun 19 20247pm Wed, Jun 19 20248pm Wed, Jun 19 20249pm Wed, Jun 19 202410pm Wed, Jun 19 202411pm Wed, Jun 19 202412am Thu, Jun 20 20241am Thu, Jun 20 20242am Thu, Jun 20 20243am Thu, Jun 20 20244am Thu, Jun 20 20245am Thu, Jun 20 20246am Thu, Jun 20 20247am Thu, Jun 20 20248am Thu, Jun 20 20249am Thu, Jun 20 202410am Thu, Jun 20 202411am Thu, Jun 20 202412pm Thu, Jun 20 20241pm Thu, Jun 20 20242pm Thu, Jun 20 20243pm Thu, Jun 20 20244pm Thu, Jun 20 20245pm Thu, Jun 20 20246pm Thu, Jun 20 20247pm Thu, Jun 20 20248pm Thu, Jun 20 20249pm Thu, Jun 20 202410pm Thu, Jun 20 202411pm Thu, Jun 20 202412am Fri, Jun 21 20241am Fri, Jun 21 20242am Fri, Jun 21 20243am Fri, Jun 21 20244am Fri, Jun 21 20245am Fri, Jun 21 20246am Fri, Jun 21 20247am Fri, Jun 21 20248am Fri, Jun 21 20249am Fri, Jun 21 202410am Fri, Jun 21 202411am Fri, Jun 21 202412pm Fri, Jun 21 20241pm Fri, Jun 21 20242pm Fri, Jun 21 20243pm Fri, Jun 21 20244pm Fri, Jun 21 20245pm Fri, Jun 21 20246pm Fri, Jun 21 20247pm Fri, Jun 21 20248pm Fri, Jun 21 20249pm Fri, Jun 21 202410pm Fri, Jun 21 202411pm Fri, Jun 21 202412am Sat, Jun 22 20241am Sat, Jun 22 20242am Sat, Jun 22 20243am Sat, Jun 22 20244am Sat, Jun 22 20245am Sat, Jun 22 20246am Sat, Jun 22 20247am Sat, Jun 22 20248am Sat, Jun 22 20249am Sat, Jun 22 202410am Sat, Jun 22 202411am Sat, Jun 22 202412pm Sat, Jun 22 20241pm Sat, Jun 22 20242pm Sat, Jun 22 20243pm Sat, Jun 22 20244pm Sat, Jun 22 20245pm Sat, Jun 22 20246pm Sat, Jun 22 20247pm Sat, Jun 22 20248pm Sat, Jun 22 20249pm Sat, Jun 22 202410pm Sat, Jun 22 202411pm Sat, Jun 22 202412am Sun, Jun 23 20241am Sun, Jun 23 20242am Sun, Jun 23 20243am Sun, Jun 23 20244am Sun, Jun 23 20245am Sun, Jun 23 20246am Sun, Jun 23 20247am Sun, Jun 23 20248am Sun, Jun 23 20249am Sun, Jun 23 202410am Sun, Jun 23 202411am Sun, Jun 23 202412pm Sun, Jun 23 20241pm Sun, Jun 23 20242pm Sun, Jun 23 20243pm Sun, Jun 23 20244pm Sun, Jun 23 20245pm Sun, Jun 23 20246pm Sun, Jun 23 20247pm Sun, Jun 23 20248pm Sun, Jun 23 20249pm Sun, Jun 23 2024

Date	06/19														06/20
Hour (EDT)	10	11	12	13	14	15	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09
Temperature (°F)	80	82	84	86	88	90	91	90	88	86	84	82	79	77	75	73	70	69	68	68	67	70	74	77
Dewpoint (°F)	68	68	68	67	67	67	66	66	66	66	66	64	62	61	61	61	61	61	61	61	62	63	65	66
Heat Index (°F)	83	85	87	89	91	93	94	93	90	88	86	83	79	77	75									77
Surface Wind (mph)	5	5	5	6	6	6	7	7	6	6	6	6	5	5	5	3	3	2	2	2	2	2	2	3
Wind Dir	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S
Gust
Sky Cover (%)	39	38	38	39	39	39	39	39	39	39	39	40	41	43	39	35	31	36	41	46	40	34	29	28
Precipitation Potential (%)	3	0	0	0	0	0	1	1	1	1	0	0	0	1	1	1	1	1	1	1	1	1	0	0
Relative Humidity (%)	66	63	59	53	50	47	44	45	48	51	55	55	56	58	62	66	73	76	78	78	84	78	74	69
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Date															06/21
Hour (EDT)	10	11	12	13	14	15	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09
Temperature (°F)	80	83	85	87	90	91	92	91	89	88	86	84	82	80	78	76	74	73	72	71	70	73	76	79
Dewpoint (°F)	66	67	67	66	66	66	66	66	67	68	69	69	68	68	67	67	67	66	66	66	67	68	68	68
Heat Index (°F)	82	86	88	89	93	94	95	94	92	92	90	88	85	83	78	76							76	79
Surface Wind (mph)	3	3	3	5	5	5	5	5	5	3	3	2	2	2	2	2	2	2	2	2	2	1	1	1
Wind Dir	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	SW	W	NW	NW
Gust
Sky Cover (%)	27	26	27	29	30	29	29	28	29	29	30	33	37	40	40	41	41	40	39	38	37	37	36	38
Precipitation Potential (%)	0	0	0	0	3	3	3	3	3	3	7	7	7	7	7	7	4	4	4	4	4	4	12	12
Relative Humidity (%)	62	59	55	50	45	44	43	44	48	52	57	61	63	67	69	74	79	79	81	84	90	84	76	69
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--

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