Point Forecast Matrices
Issued by NWS Sterling, VA
Issued by NWS Sterling, VA
169 FOUS51 KLWX 180930 PFMLWX Point Forecast Matrices National Weather Service Baltimore MD/Washington DC 530 AM EDT Tue Aug 18 2026 VAZ054-182000- Reagan National Airport-Arlington VA 38.86N 77.03W Elev. 66 ft 530 AM EDT Tue Aug 18 2026 Date Tue 08/18/26 Wed 08/19/26 Thu 08/20/26 EDT 3hrly 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 UTC 3hrly 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 Max/Min 88 72 89 74 87 Temp 76 83 88 88 82 78 75 72 74 83 88 89 82 78 76 75 75 83 87 84 79 Dewpt 71 71 69 68 67 68 65 63 62 61 60 61 64 67 68 68 68 68 69 69 70 RH 85 67 54 52 61 71 71 73 66 47 39 39 55 69 76 79 79 61 55 61 74 Wind dir N N N NW N NW NW NW NW NW W W S S W W N E SW N E Wind spd 8 8 8 9 5 5 6 6 5 5 6 6 5 4 4 5 5 6 5 9 8 Clouds FW SC SC SC FW FW FW SC FW CL CL CL FW FW SC SC B1 B1 B2 B2 B2 PoP 12hr 10 0 0 20 70 QPF 12hr 0 0 0 0 0.60 Snow 12hr 00-00 00-00 00-00 Rain shwrs S S C C L L L Tstms S S C C C Heat index 88 92 92 85 83 88 89 83 86 91 88 Max heat 92 92 82 88 89 82 91 91 Date Fri 08/21/26 Sat 08/22/26 Sun 08/23/26 Mon 08/24/26 EDT 6hrly 02 08 14 20 02 08 14 20 02 08 14 20 02 08 14 20 UTC 6hrly 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 Min/Max 71 84 71 84 71 85 69 84 Temp 73 72 83 78 73 73 81 77 73 73 83 78 71 70 82 77 Dewpt 69 67 68 67 69 69 70 69 69 68 67 65 63 63 62 62 PWind dir N NE E E SW W NW W Wind char GN LT LT LT LT GN GN GN Avg clouds B2 B2 B1 B2 B2 B2 B2 B2 B1 B1 SC B1 SC SC FW FW PoP 12hr 60 40 50 60 50 30 20 5 Rain shwrs L S C C C C L C S C S Tstms C S S S S S S $$ MDZ013-182000- Baltimore/Washington Airport-Anne Arundel MD 39.19N 76.67W Elev. 154 ft 530 AM EDT Tue Aug 18 2026 Date Tue 08/18/26 Wed 08/19/26 Thu 08/20/26 EDT 3hrly 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 UTC 3hrly 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 Max/Min 87 69 88 72 85 Temp 74 82 87 86 80 75 72 70 71 82 86 86 80 76 74 72 74 82 85 82 76 Dewpt 71 71 70 69 68 68 64 63 62 62 62 62 66 68 68 68 69 70 70 71 71 RH 90 69 57 57 67 79 76 78 73 51 45 45 62 76 82 87 84 67 61 69 85 Wind dir N N NW NW NW NW NW NW NW NW W W SW SW W NW N NE SW NW NE Wind spd 4 4 4 5 2 2 2 3 2 3 4 4 2 2 2 2 2 3 4 4 3 Clouds FW FW SC SC FW FW FW FW FW FW CL FW FW FW SC SC B1 B1 B2 B2 B1 PoP 12hr 5 0 0 20 70 QPF 12hr 0 0 0 0 0.50 Snow 12hr 00-00 00-00 00-00 Rain shwrs S S C C L L C Tstms S C C C Heat index 86 92 90 83 83 86 86 82 86 90 86 Max heat 92 91 86 88 90 90 Date Fri 08/21/26 Sat 08/22/26 Sun 08/23/26 Mon 08/24/26 EDT 6hrly 02 08 14 20 02 08 14 20 02 08 14 20 02 08 14 20 UTC 6hrly 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 Min/Max 68 83 69 82 68 84 66 83 Temp 70 69 83 76 71 71 81 76 71 70 82 76 68 68 81 75 Dewpt 69 67 68 70 70 70 72 72 70 70 70 69 65 65 65 65 PWind dir N NE E E NE W W W Wind char LT LT LT LT LT LT LT LT Avg clouds B1 B2 B1 B1 B2 B2 B2 B1 B1 B1 B1 B1 SC SC FW FW PoP 12hr 50 40 50 50 50 30 20 5 Rain shwrs C S C C C C C C S C S Tstms C S S S S C S $$ MDZ011-182000- Baltimore Inner Harbor-Baltimore City MD 39.28N 76.61W Elev. 20 ft 530 AM EDT Tue Aug 18 2026 Date Tue 08/18/26 Wed 08/19/26 Thu 08/20/26 EDT 3hrly 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 UTC 3hrly 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 Max/Min 88 70 89 73 86 Temp 74 83 87 87 81 76 73 71 72 84 88 88 82 78 75 73 75 83 86 84 77 Dewpt 70 69 67 66 66 66 63 61 61 60 60 61 64 66 67 67 67 67 68 69 69 RH 87 63 52 50 60 71 71 71 68 44 39 40 55 67 76 81 76 59 55 61 76 Wind dir N N NW NW NW NW NW NW NW NW W W SW SW NW N N NE SW NW NE Wind spd 3 4 5 6 2 1 2 2 2 3 5 5 2 1 1 1 1 3 4 4 2 Clouds FW FW SC SC FW FW FW FW FW FW CL FW SC FW SC SC B1 B1 B2 B2 B2 PoP 12hr 5 0 0 20 80 QPF 12hr 0 0 0 0 0.48 Snow 12hr 00-00 00-00 00-00 Rain shwrs S S C C D D C Tstms S C C C Heat index 87 90 89 83 84 88 88 83 86 89 88 Max heat 91 91 88 89 82 89 89 Date Fri 08/21/26 Sat 08/22/26 Sun 08/23/26 Mon 08/24/26 EDT 6hrly 02 08 14 20 02 08 14 20 02 08 14 20 02 08 14 20 UTC 6hrly 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 Min/Max 71 84 71 83 70 85 68 84 Temp 72 72 84 78 72 72 81 77 72 72 82 77 70 70 82 77 Dewpt 68 65 66 67 68 68 69 68 68 67 66 64 63 61 60 60 PWind dir N NE E E NE W W W Wind char LT LT LT LT LT LT LT LT Avg clouds B1 B2 B1 B1 B2 B1 B2 B1 B1 B1 B1 B1 SC SC FW FW PoP 12hr 50 40 50 50 50 30 20 5 Rain shwrs C S C C C C C C S C S Tstms C S S S C S $$ WVZ052-182000- Martinsburg Airport-Berkeley WV 39.41N 77.98W Elev. 558 ft 530 AM EDT Tue Aug 18 2026 Date Tue 08/18/26 Wed 08/19/26 Thu 08/20/26 EDT 3hrly 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 UTC 3hrly 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 Max/Min 83 62 86 66 81 Temp 71 78 83 82 76 70 66 63 67 80 86 86 77 71 69 66 68 76 81 77 73 Dewpt 67 67 65 64 62 61 60 59 61 62 61 62 64 65 66 66 67 67 68 68 68 RH 87 69 55 55 62 73 81 87 81 54 43 45 64 81 90100 97 74 65 74 84 Wind dir N N NW NW NW NW N N N W W W W N N N N N NW N N Wind spd 4 5 6 6 5 3 0 0 0 4 5 5 2 0 0 0 0 0 4 4 2 Clouds SC SC FW FW FW CL FW FW CL FW FW SC SC SC B1 B1 B1 B1 B2 B2 B2 PoP 12hr 0 0 0 30 70 QPF 12hr 0 0 0 0.02 0.16 Snow 12hr 00-00 00-00 00-00 Rain shwrs C C C C L L C Tstms S C S S Heat index 85 83 81 86 86 84 Max heat 85 85 86 86 84 83 Date Fri 08/21/26 Sat 08/22/26 Sun 08/23/26 Mon 08/24/26 EDT 6hrly 02 08 14 20 02 08 14 20 02 08 14 20 02 08 14 20 UTC 6hrly 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 Min/Max 63 79 63 80 63 81 60 80 Temp 65 65 79 74 66 67 79 74 67 67 80 75 64 64 79 74 Dewpt 65 65 65 66 65 66 69 68 66 66 64 63 61 61 60 60 PWind dir N NE NE E W W W W Wind char LT LT LT LT LT LT LT LT Avg clouds B2 B2 B1 B1 B1 B2 B2 B2 B1 B1 SC SC SC SC FW SC PoP 12hr 30 40 40 60 40 20 5 5 Rain shwrs C S C C C S L C S S Tstms S S S S S $$ VAZ506-182000- Washington Dulles Airport-Loudoun VA 38.96N 77.45W Elev. 321 ft 530 AM EDT Tue Aug 18 2026 Date Tue 08/18/26 Wed 08/19/26 Thu 08/20/26 EDT 3hrly 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 UTC 3hrly 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 Max/Min 86 67 88 70 85 Temp 72 81 84 84 79 73 70 68 70 82 87 87 80 75 73 70 72 81 85 81 77 Dewpt 70 71 69 68 67 65 63 62 63 63 63 64 65 68 68 67 69 70 71 71 71 RH 93 72 61 59 67 76 78 81 78 53 45 46 60 79 84 90 90 69 63 72 82 Wind dir N N NW NW NW NW NW NW NW NW W W S W NW NW N N SW N N Wind spd 4 5 6 6 2 3 2 2 2 3 4 3 2 1 1 1 2 3 4 4 3 Clouds FW SC SC SC FW SC FW FW FW FW CL FW SC SC SC SC B1 SC B2 B2 B2 PoP 12hr 5 0 0 10 70 QPF 12hr 0 0 0 0 0.44 Snow 12hr 00-00 00-00 00-00 Rain shwrs S S L L L Tstms C C S Obvis PF Heat index 85 88 87 83 88 88 82 85 90 85 Max heat 88 90 88 89 90 89 Date Fri 08/21/26 Sat 08/22/26 Sun 08/23/26 Mon 08/24/26 EDT 6hrly 02 08 14 20 02 08 14 20 02 08 14 20 02 08 14 20 UTC 6hrly 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 Min/Max 66 83 67 83 67 84 64 83 Temp 68 67 83 76 69 70 80 76 70 69 81 76 67 66 80 76 Dewpt 68 67 69 70 69 70 73 72 70 69 70 68 66 65 66 66 PWind dir N NE E E W W NW NW Wind char LT LT LT LT LT LT LT LT Avg clouds B2 B2 B1 B1 B2 B2 B2 B2 B1 B1 SC B1 SC SC FW SC PoP 12hr 60 40 50 60 50 30 10 5 Rain shwrs L C C C C L C C Tstms S S S S C $$ VAZ037-182000- Charlottesville Airport-Albemarle VA 38.14N 78.45W Elev. 640 ft 530 AM EDT Tue Aug 18 2026 Date Tue 08/18/26 Wed 08/19/26 Thu 08/20/26 EDT 3hrly 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 UTC 3hrly 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 Max/Min 86 68 89 69 88 Temp 71 82 86 84 77 74 71 69 70 81 87 88 79 74 70 69 71 83 88 83 76 Dewpt 71 71 71 71 71 70 67 65 65 64 64 64 67 67 67 66 67 68 69 71 71 RH 100 69 61 65 82 87 87 87 84 56 46 45 67 79 90 90 87 61 54 67 85 Wind dir N NE N NE N N N N N N SW S N N N N N E S NE NE Wind spd 0 3 4 4 0 0 0 0 0 0 3 3 0 0 0 0 0 2 4 5 4 Clouds SC B1 B1 SC SC SC B1 SC SC FW CL FW B1 FW FW SC SC SC B2 B2 B2 PoP 12hr 30 10 0 5 70 QPF 12hr 0.03 0 0 0 0.30 Snow 12hr 00-00 00-00 00-00 Rain shwrs C C L L L Tstms C C C C C Obvis PF Heat index 86 91 89 83 88 89 86 92 88 Max heat 91 91 88 90 92 91 Date Fri 08/21/26 Sat 08/22/26 Sun 08/23/26 Mon 08/24/26 EDT 6hrly 02 08 14 20 02 08 14 20 02 08 14 20 02 08 14 20 UTC 6hrly 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 Min/Max 67 83 66 83 66 85 63 84 Temp 71 68 83 75 70 67 81 75 69 67 83 76 65 65 82 75 Dewpt 69 68 68 69 68 67 70 70 68 67 65 65 63 62 61 61 PWind dir NE NE NE SE W W NW W Wind char LT LT LT LT LT LT LT LT Avg clouds B2 B1 B1 B2 B2 B2 B1 B2 SC SC SC SC SC FW FW FW PoP 12hr 60 60 50 60 20 20 5 5 Rain shwrs L L C C C L S S S Tstms C C S S S $$ MDZ003-182000- Hagerstown Airport-Washington MD 39.71N 77.73W Elev. 705 ft 530 AM EDT Tue Aug 18 2026 Date Tue 08/18/26 Wed 08/19/26 Thu 08/20/26 EDT 3hrly 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 UTC 3hrly 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 Max/Min 84 62 86 67 82 Temp 71 79 84 84 77 70 66 63 66 79 85 86 78 72 68 67 69 78 82 79 75 Dewpt 68 67 66 64 62 61 60 59 61 63 63 64 65 66 66 65 67 67 69 69 68 RH 90 67 55 51 60 73 81 87 84 58 48 48 64 81 93 93 93 69 65 72 79 Wind dir N N NW NW NW N W N S W W W W NW N N N N NW N NE Wind spd 3 4 5 5 4 2 1 0 1 3 5 5 3 2 1 1 2 2 3 4 2 Clouds SC SC FW FW FW FW FW CL CL FW FW SC SC B1 B1 B1 B1 B2 B2 B2 B1 PoP 12hr 0 0 0 20 70 QPF 12hr 0 0 0 0 0.12 Snow 12hr 00-00 00-00 00-00 Rain shwrs S S C C L L C Tstms C S S Heat index 86 85 86 87 85 Max heat 86 86 86 87 85 85 Date Fri 08/21/26 Sat 08/22/26 Sun 08/23/26 Mon 08/24/26 EDT 6hrly 02 08 14 20 02 08 14 20 02 08 14 20 02 08 14 20 UTC 6hrly 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 Min/Max 63 81 65 81 64 81 61 80 Temp 66 65 81 75 67 67 80 75 67 66 80 75 63 64 79 74 Dewpt 65 64 65 67 65 66 70 69 67 66 67 65 63 62 63 63 PWind dir N NE NE SE SW W W W Wind char LT LT LT LT LT LT LT LT Avg clouds B2 B1 B1 B1 B1 B2 B1 B2 B1 B1 SC SC SC SC FW FW PoP 12hr 30 30 30 60 40 30 5 5 Rain shwrs C S C C C S L C S S C Tstms S S S C $$ MDZ017-182000- Patuxent River NAS MD 38.29N 76.41W Elev. 39 ft 530 AM EDT Tue Aug 18 2026 Date Tue 08/18/26 Wed 08/19/26 Thu 08/20/26 EDT 3hrly 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 UTC 3hrly 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 Max/Min 87 74 89 75 88 Temp 78 82 86 86 81 78 76 74 76 84 89 89 82 79 77 75 79 85 88 84 77 Dewpt 75 75 73 73 72 72 71 69 68 67 66 66 69 73 73 73 74 74 74 74 74 RH 91 79 65 65 74 82 85 84 76 57 47 47 65 82 87 94 85 70 63 72 90 Wind dir NW N N N N N N N NW NW W W S S S SW SW S S SE SE Wind spd 5 8 6 5 3 3 2 4 4 3 3 4 4 5 4 4 3 4 5 6 4 Clouds SC FW FW SC FW CL FW SC FW FW FW CL CL FW SC SC B1 B1 B2 B2 B2 PoP 12hr 20 0 0 30 80 QPF 12hr 0 0 0 0.02 0.62 Snow 12hr 00-00 00-00 00-00 Rain shwrs S S C C C C D D L Tstms S S S S C C C Heat index 89 93 93 85 87 92 92 85 93 97 91 Max heat 93 94 92 92 83 97 95 Date Fri 08/21/26 Sat 08/22/26 Sun 08/23/26 Mon 08/24/26 EDT 6hrly 02 08 14 20 02 08 14 20 02 08 14 20 02 08 14 20 UTC 6hrly 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 Min/Max 72 84 71 82 71 84 69 83 Temp 73 75 84 77 73 73 80 77 74 73 82 78 73 71 81 76 Dewpt 73 72 71 72 72 73 73 73 72 72 70 70 67 66 65 65 PWind dir SW N E SE SW W W NW Wind char LT LT LT LT LT LT LT LT Avg clouds B2 B1 B1 B1 B2 B2 B2 B2 B1 B1 B1 B1 SC SC FW FW PoP 12hr 70 40 70 70 50 30 20 5 Rain shwrs L C S C L L L L C C S C S Tstms C S S S S S S S $$ WVZ502-182000- Petersburg WV 38.99N 79.15W Elev. 963 ft 530 AM EDT Tue Aug 18 2026 Date Tue 08/18/26 Wed 08/19/26 Thu 08/20/26 EDT 3hrly 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 UTC 3hrly 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 Max/Min 85 59 88 64 84 Temp 68 77 85 85 76 68 64 60 63 80 88 88 77 70 66 65 65 80 84 81 75 Dewpt 68 69 68 65 64 62 60 59 60 63 63 63 65 65 64 64 65 68 69 69 68 RH 100 76 57 51 66 81 87 96 90 56 43 43 67 84 93 97100 67 61 67 79 Wind dir N NE NW NW NW NW S SW S SW W W NW W N N N N SW NW N Wind spd 0 2 4 5 3 1 1 1 1 1 2 5 2 1 0 0 0 0 2 2 1 Clouds B2 SC SC FW FW FW FW FW FW FW FW SC SC SC B1 B1 B2 B2 OV OV B1 PoP 12hr 30 0 0 30 80 QPF 12hr 0.02 0 0 0 0.16 Snow 12hr 00-00 00-00 00-00 Rain shwrs C C C L L D D C Tstms S C C S Obvis PF Heat index 88 87 81 89 89 83 88 84 Max heat 88 87 89 89 88 88 Date Fri 08/21/26 Sat 08/22/26 Sun 08/23/26 Mon 08/24/26 EDT 6hrly 02 08 14 20 02 08 14 20 02 08 14 20 02 08 14 20 UTC 6hrly 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 Min/Max 61 82 62 83 60 82 57 82 Temp 65 62 82 74 65 64 81 74 65 63 79 73 61 60 80 72 Dewpt 65 62 67 68 65 64 69 67 64 63 65 63 61 60 61 61 PWind dir N NE N SW SW W W W Wind char LT LT LT LT LT LT LT LT Avg clouds B1 B2 B1 B2 B1 B1 B1 B2 SC SC SC SC FW SC SC FW PoP 12hr 40 70 30 60 20 20 5 5 Rain shwrs C S C L C C L S S S Tstms S C C S S $$ MDZ014-182000- Annapolis MD 38.99N 76.49W Elev. 7 ft 530 AM EDT Tue Aug 18 2026 Date Tue 08/18/26 Wed 08/19/26 Thu 08/20/26 EDT 3hrly 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 UTC 3hrly 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 Max/Min 88 72 89 74 84 Temp 77 83 87 86 82 78 75 72 75 84 88 88 83 78 76 74 76 82 84 82 78 Dewpt 72 72 71 70 70 69 66 64 63 62 63 63 66 70 70 70 70 70 71 71 71 RH 85 70 59 59 67 74 74 76 66 48 43 43 57 76 82 87 82 67 65 69 79 Wind dir N N NE N N N N NW NW NW W SW S N N N N N SE NW NE Wind spd 5 8 6 5 0 0 0 2 3 3 4 5 3 0 0 0 3 5 6 8 4 Clouds SC FW SC B1 FW FW FW FW FW CL CL CL FW FW B1 B1 B1 B1 B2 B2 B2 PoP 12hr 20 0 0 30 70 QPF 12hr 0 0 0 0 0.56 Snow 12hr 00-00 00-00 00-00 Rain shwrs S C C C C L L L Tstms S S C C C Heat index 88 93 91 86 85 89 89 85 86 89 86 Max heat 93 94 83 89 90 83 89 89 Date Fri 08/21/26 Sat 08/22/26 Sun 08/23/26 Mon 08/24/26 EDT 6hrly 02 08 14 20 02 08 14 20 02 08 14 20 02 08 14 20 UTC 6hrly 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 Min/Max 71 82 70 83 70 85 68 84 Temp 72 73 81 78 72 73 82 77 72 72 83 78 71 71 82 77 Dewpt 70 68 68 70 70 71 72 71 70 70 70 68 65 65 65 64 PWind dir N NE E E SW W W W Wind char LT LT LT LT LT LT LT LT Avg clouds B2 B2 B1 B1 B2 B2 B2 B2 B1 B1 B1 B1 SC SC FW FW PoP 12hr 60 40 60 60 50 30 20 5 Rain shwrs L S C L C C L C C C S Tstms C S S S S S S $$