Point Forecast Matrices
Issued by NWS Sterling, VA
Issued by NWS Sterling, VA
763 FOUS51 KLWX 182101 PFMLWX Point Forecast Matrices National Weather Service Baltimore MD/Washington DC 500 PM EDT Tue Aug 18 2026 VAZ054-190800- Reagan National Airport-Arlington VA 38.86N 77.03W Elev. 66 ft 500 PM EDT Tue Aug 18 2026 Date 08/18/26 Wed 08/19/26 Thu 08/20/26 Fri EDT 3hrly 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 UTC 3hrly 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 Min/Max 71 90 74 88 71 Temp 85 81 77 74 72 73 82 87 88 83 78 76 75 76 83 86 83 78 75 73 71 73 Dewpt 69 65 65 63 62 64 63 62 61 63 65 66 67 67 68 69 68 68 68 68 66 65 RH 59 58 67 69 71 73 53 43 40 51 64 71 76 74 61 57 61 71 79 84 84 76 Wind dir NW N NW NW NW NW NW W W SW S W NW N E NW NW NE N N N N Wind spd 9 6 6 6 6 5 5 6 6 5 4 3 4 4 5 5 8 9 5 6 9 9 Clouds SC FW FW SC SC SC FW CL CL FW CL SC SC B1 B1 B2 B2 B2 B1 B1 SC SC PoP 12hr 0 5 20 60 40 QPF 12hr 0 0 0.02 0.16 0.06 Snow 12hr 00-00 00-00 00-00 Rain shwrs S S L L C C S Tstms S S S C S Heat index 89 83 83 87 88 84 86 90 86 Max heat 89 87 89 82 90 89 Date 08/21 Sat 08/22/26 Sun 08/23/26 Mon 08/24/26 Tue 08/25/26 EDT 6hrly 14 20 02 08 14 20 02 08 14 20 02 08 14 20 02 08 14 20 UTC 6hrly 18 00 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 Max/Min 84 71 84 71 85 68 85 69 86 Temp 80 78 73 73 79 78 73 72 81 78 71 70 80 78 71 71 82 79 Dewpt 66 66 68 68 70 68 69 68 67 64 63 62 62 62 62 63 64 63 PWind dir NE E E SW W NW W W S Wind char GN LT LT LT GN GN GN GN GN Avg clouds B1 B1 B2 B2 B2 B1 B1 B1 SC B1 SC FW FW FW FW SC SC SC PoP 12hr 50 60 50 40 30 5 5 10 20 Rain shwrs S C L C C C C S C S Tstms S C S S C $$ MDZ013-190800- Baltimore/Washington Airport-Anne Arundel MD 39.19N 76.67W Elev. 154 ft 500 PM EDT Tue Aug 18 2026 Date 08/18/26 Wed 08/19/26 Thu 08/20/26 Fri EDT 3hrly 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 UTC 3hrly 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 Min/Max 68 88 71 86 68 Temp 85 79 74 72 69 70 81 86 86 80 76 74 73 73 81 84 80 76 73 71 70 69 Dewpt 69 70 68 66 63 64 64 63 63 66 68 68 68 69 71 71 71 71 70 68 66 66 RH 59 74 82 81 81 81 56 46 46 62 76 82 84 87 72 65 74 85 90 90 87 90 Wind dir NW NW NW NW NW NW NW W W SW SW W NW N NE N N N N N N N Wind spd 5 3 2 2 3 2 3 4 4 2 1 2 1 2 3 4 4 3 2 2 4 4 Clouds B1 FW CL FW FW FW CL CL CL FW CL SC SC B2 B1 B2 B2 B1 B1 SC SC SC PoP 12hr 0 0 20 60 30 QPF 12hr 0 0 0.02 0.18 0.04 Snow 12hr 00-00 00-00 00-00 Rain shwrs S S L L C C Tstms S C C S Heat index 89 83 87 87 82 85 89 83 Max heat 89 87 89 89 88 Date 08/21 Sat 08/22/26 Sun 08/23/26 Mon 08/24/26 Tue 08/25/26 EDT 6hrly 14 20 02 08 14 20 02 08 14 20 02 08 14 20 02 08 14 20 UTC 6hrly 18 00 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 Max/Min 83 68 83 68 84 66 84 66 85 Temp 79 76 70 70 79 76 71 70 80 76 68 68 80 77 68 68 81 78 Dewpt 68 69 68 69 71 72 70 70 70 68 65 65 65 65 64 65 66 67 PWind dir NE E E SW W W W W S Wind char LT LT LT LT LT LT LT LT LT Avg clouds SC B1 B2 B2 B2 B1 B1 B1 SC B1 FW FW FW FW FW SC SC SC PoP 12hr 30 60 40 50 30 10 5 10 20 Rain shwrs C L C C C C S S C S Tstms S C S C C $$ MDZ011-190800- Baltimore Inner Harbor-Baltimore City MD 39.28N 76.61W Elev. 20 ft 500 PM EDT Tue Aug 18 2026 Date 08/18/26 Wed 08/19/26 Thu 08/20/26 Fri EDT 3hrly 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 UTC 3hrly 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 Min/Max 70 89 73 87 70 Temp 85 80 75 72 70 72 82 87 87 82 77 75 74 75 82 85 81 77 74 72 70 71 Dewpt 68 66 65 63 61 62 61 60 61 63 65 66 66 66 67 67 68 67 67 66 64 62 RH 57 62 71 73 73 71 49 40 42 53 67 74 76 74 61 55 65 71 79 81 81 73 Wind dir NW NW NW NW NW NW NW W W SW W W NW N NE W NW N N N N N Wind spd 6 2 1 2 2 2 3 4 5 2 1 1 1 1 3 4 4 3 2 2 3 4 Clouds B1 FW CL FW FW CL CL CL FW FW FW SC SC B1 B1 B2 B2 B1 B1 SC SC SC PoP 12hr 0 0 20 60 30 QPF 12hr 0 0 0.02 0.17 0.03 Snow 12hr 00-00 00-00 00-00 Rain shwrs S S L L C C Tstms S C C S Heat index 88 82 83 87 87 83 85 88 84 Max heat 88 87 89 88 87 Date 08/21 Sat 08/22/26 Sun 08/23/26 Mon 08/24/26 Tue 08/25/26 EDT 6hrly 14 20 02 08 14 20 02 08 14 20 02 08 14 20 02 08 14 20 UTC 6hrly 18 00 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 Max/Min 84 71 84 71 85 68 85 68 86 Temp 80 77 72 72 80 78 72 72 81 78 70 70 80 78 70 70 82 79 Dewpt 63 65 66 67 68 68 68 68 66 64 62 61 60 61 62 62 62 62 PWind dir NE E E SW W NW W W S Wind char LT LT LT LT LT LT LT LT LT Avg clouds SC B1 B2 B1 B2 B1 B1 B1 SC B1 FW FW FW FW FW SC SC SC PoP 12hr 30 60 40 50 30 20 5 10 20 Rain shwrs C L C S C C S S C S S Tstms S C S C C S $$ WVZ052-190800- Martinsburg Airport-Berkeley WV 39.41N 77.98W Elev. 558 ft 500 PM EDT Tue Aug 18 2026 Date 08/18/26 Wed 08/19/26 Thu 08/20/26 Fri EDT 3hrly 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 UTC 3hrly 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 Min/Max 61 86 67 82 62 Temp 82 76 69 66 63 66 79 84 86 80 73 71 69 69 77 81 78 74 69 66 63 65 Dewpt 63 61 61 60 60 61 62 61 62 64 65 66 66 67 67 67 67 67 66 65 63 63 RH 53 60 76 81 90 84 56 46 45 58 76 84 90 93 71 63 69 79 90 97100 93 Wind dir NW NW NW N N N W W W NW N N N N N N N N N N N N Wind spd 6 5 3 0 0 0 3 5 5 3 0 0 0 0 2 4 4 0 0 0 3 4 Clouds SC FW CL FW FW CL CL FW SC FW SC B2 B2 B2 B1 B2 B2 B1 B1 SC SC SC PoP 12hr 0 0 20 70 30 QPF 12hr 0 0 0.02 0.13 0.01 Snow 12hr 00-00 00-00 00-00 Rain shwrs S S C C L L C C Tstms S C C S Heat index 83 84 86 82 83 Max heat 83 84 86 83 82 Date 08/21 Sat 08/22/26 Sun 08/23/26 Mon 08/24/26 Tue 08/25/26 EDT 6hrly 14 20 02 08 14 20 02 08 14 20 02 08 14 20 02 08 14 20 UTC 6hrly 18 00 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 Max/Min 80 63 81 63 81 60 81 61 83 Temp 78 74 66 67 80 75 68 67 79 75 64 64 80 75 63 65 81 77 Dewpt 63 64 64 65 67 67 66 66 64 62 61 61 60 60 60 61 62 63 PWind dir NE E SE SW W W W NW S Wind char LT LT LT LT LT LT LT LT LT Avg clouds B1 B1 B1 B2 B1 B1 B1 SC SC SC FW FW FW FW FW SC SC SC PoP 12hr 30 40 40 50 20 5 5 5 20 Rain shwrs C C C S C C S S S Tstms S S S S S S $$ VAZ506-190800- Washington Dulles Airport-Loudoun VA 38.96N 77.45W Elev. 321 ft 500 PM EDT Tue Aug 18 2026 Date 08/18/26 Wed 08/19/26 Thu 08/20/26 Fri EDT 3hrly 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 UTC 3hrly 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 Min/Max 65 88 70 86 66 Temp 83 79 73 69 67 68 81 86 87 82 75 73 72 72 80 84 80 76 72 69 67 68 Dewpt 68 68 66 65 63 64 64 64 64 65 68 68 68 69 71 72 72 71 70 69 66 66 RH 61 69 79 87 87 87 56 48 46 56 79 84 87 90 74 67 77 85 93100 97 93 Wind dir NW N NW NW NW NW NW W W W W N N N N W NW N N N N N Wind spd 6 4 3 2 2 2 3 4 3 2 1 0 1 2 3 4 4 3 1 2 3 4 Clouds SC FW FW FW SC CL CL FW CL FW FW SC SC B1 B1 B2 B2 B1 B1 B1 SC B1 PoP 12hr 0 0 10 70 40 QPF 12hr 0 0 0 0.13 0.03 Snow 12hr 00-00 00-00 00-00 Rain shwrs L L C C S Tstms C C S Heat index 86 83 87 88 84 83 90 84 Max heat 86 87 88 90 88 Date 08/21 Sat 08/22/26 Sun 08/23/26 Mon 08/24/26 Tue 08/25/26 EDT 6hrly 14 20 02 08 14 20 02 08 14 20 02 08 14 20 02 08 14 20 UTC 6hrly 18 00 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 Max/Min 83 67 83 66 84 63 84 64 85 Temp 79 76 69 69 79 77 70 69 80 76 67 66 80 77 67 67 81 78 Dewpt 69 69 68 69 72 72 70 69 70 67 65 64 66 66 64 65 68 68 PWind dir NE E SE SW W NW W W SW Wind char LT LT LT LT LT LT LT LT LT Avg clouds B1 B1 B1 B2 B1 B1 B1 B1 SC B1 FW FW FW FW FW SC SC SC PoP 12hr 40 50 50 50 30 5 5 20 20 Rain shwrs S C C C C C C S C S S Tstms S S S S C $$ VAZ037-190800- Charlottesville Airport-Albemarle VA 38.14N 78.45W Elev. 640 ft 500 PM EDT Tue Aug 18 2026 Date 08/18/26 Wed 08/19/26 Thu 08/20/26 Fri EDT 3hrly 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 UTC 3hrly 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 Min/Max 67 88 69 86 66 Temp 82 77 73 71 68 69 81 86 87 80 74 72 71 71 82 85 82 76 72 70 68 67 Dewpt 70 70 68 65 64 65 64 64 63 66 66 66 65 66 67 68 69 70 70 69 68 67 RH 67 79 84 81 87 87 56 48 45 62 76 81 81 84 61 57 65 82 93 97100100 Wind dir N N N N N N N SW S E N N N N E S NW N N N N N Wind spd 4 0 0 0 0 0 0 4 4 1 0 0 0 0 3 4 4 4 2 0 2 4 Clouds B1 SC B1 B1 SC FW CL CL FW FW FW FW SC B1 SC B2 B2 B2 B2 B1 B1 B1 PoP 12hr 20 0 5 60 60 QPF 12hr 0.05 0 0 0.18 0.10 Snow 12hr 00-00 00-00 00-00 Rain shwrs S S L L L L S S C Tstms C C C Heat index 86 83 87 88 82 85 88 85 Max heat 86 87 89 88 87 Date 08/21 Sat 08/22/26 Sun 08/23/26 Mon 08/24/26 Tue 08/25/26 EDT 6hrly 14 20 02 08 14 20 02 08 14 20 02 08 14 20 02 08 14 20 UTC 6hrly 18 00 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 Max/Min 81 66 82 65 84 61 84 63 84 Temp 79 75 69 68 80 76 69 67 82 75 64 64 82 76 66 66 82 77 Dewpt 68 68 67 68 69 69 68 67 64 63 61 61 60 63 62 61 63 65 PWind dir NE NE S W W NW SW SW S Wind char LT LT LT LT LT LT LT LT LT Avg clouds B1 B2 B2 B2 B1 B1 B1 SC SC SC FW FW FW FW FW SC SC SC PoP 12hr 60 60 40 40 20 5 5 10 20 Rain shwrs C L L C C C C S S Tstms C S S S S $$ MDZ003-190800- Hagerstown Airport-Washington MD 39.71N 77.73W Elev. 705 ft 500 PM EDT Tue Aug 18 2026 Date 08/18/26 Wed 08/19/26 Thu 08/20/26 Fri EDT 3hrly 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 UTC 3hrly 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 Min/Max 61 86 67 82 62 Temp 83 76 70 66 63 65 77 83 84 80 73 71 69 69 76 80 77 74 69 66 63 65 Dewpt 65 65 64 62 60 62 63 63 63 65 67 66 66 67 69 69 69 68 67 65 62 62 RH 55 69 81 87 90 90 62 51 49 60 81 84 90 93 79 69 76 82 93 97 97 90 Wind dir NW NW N NW N W W W W NW NW NW N N N W N N N N N N Wind spd 4 4 2 1 0 1 3 5 5 3 2 1 1 2 2 3 4 2 2 2 4 4 Clouds SC FW FW FW FW FW FW FW SC FW B1 B2 B2 B1 B2 B2 B2 B2 B1 SC SC SC PoP 12hr 0 0 20 70 30 QPF 12hr 0 0 0.01 0.12 0.04 Snow 12hr 00-00 00-00 00-00 Rain shwrs S S C C L L C C Tstms S C C S Heat index 85 84 85 82 83 Max heat 85 84 86 83 Date 08/21 Sat 08/22/26 Sun 08/23/26 Mon 08/24/26 Tue 08/25/26 EDT 6hrly 14 20 02 08 14 20 02 08 14 20 02 08 14 20 02 08 14 20 UTC 6hrly 18 00 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 Max/Min 81 64 82 64 82 60 82 61 83 Temp 79 75 66 67 80 76 68 67 79 75 63 64 79 75 64 64 80 76 Dewpt 65 65 64 65 69 69 67 67 67 64 62 62 63 63 61 62 65 65 PWind dir E E SE SW W W W N SW Wind char LT LT LT LT LT LT LT LT LT Avg clouds SC SC B1 B1 B1 B1 B1 B1 SC SC SC FW CL FW FW SC SC SC PoP 12hr 20 30 50 50 20 5 5 5 20 Rain shwrs S C C S C C S S S Tstms S S S C S S $$ MDZ017-190800- Patuxent River NAS MD 38.29N 76.41W Elev. 39 ft 500 PM EDT Tue Aug 18 2026 Date 08/18/26 Wed 08/19/26 Thu 08/20/26 Fri EDT 3hrly 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 UTC 3hrly 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 Min/Max 73 89 74 88 71 Temp 84 81 78 76 74 75 82 87 87 81 78 77 75 77 84 87 83 77 75 73 72 74 Dewpt 74 72 71 70 68 69 67 66 65 68 70 72 72 73 73 73 73 73 73 72 71 71 RH 72 74 79 82 82 82 61 50 48 65 76 85 90 87 70 63 72 87 94 97 97 90 Wind dir N N N N N N N NW W S S S SW SW S NW E NE NE N N N Wind spd 5 3 3 3 4 4 4 3 4 3 4 4 3 3 4 5 5 4 4 4 5 6 Clouds SC FW FW FW SC SC SC FW CL CL CL SC SC SC SC B2 B2 B2 B2 B1 B2 B1 PoP 12hr 10 10 20 70 60 QPF 12hr 0 0 0.05 0.31 0.20 Snow 12hr 00-00 00-00 00-00 Rain shwrs S S S S S L L L L C C S Tstms S S S C C C S Heat index 91 85 85 89 89 84 90 94 89 Max heat 91 89 90 94 93 Date 08/21 Sat 08/22/26 Sun 08/23/26 Mon 08/24/26 Tue 08/25/26 EDT 6hrly 14 20 02 08 14 20 02 08 14 20 02 08 14 20 02 08 14 20 UTC 6hrly 18 00 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 Max/Min 84 70 82 70 84 68 83 70 84 Temp 81 77 73 74 79 77 74 74 82 77 72 70 81 78 73 73 81 79 Dewpt 71 71 71 72 73 73 72 72 71 69 67 66 65 66 66 66 67 68 PWind dir NE E E SW W NW W S S Wind char LT LT LT LT LT LT LT LT LT Avg clouds B1 B2 B2 B2 B2 B2 B1 B1 SC B1 SC FW CL FW FW SC SC SC PoP 12hr 60 70 60 40 40 20 10 10 20 Rain shwrs S L L L L L C S C S S Tstms C C S S C $$ WVZ502-190800- Petersburg WV 38.99N 79.15W Elev. 963 ft 500 PM EDT Tue Aug 18 2026 Date 08/18/26 Wed 08/19/26 Thu 08/20/26 Fri EDT 3hrly 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 UTC 3hrly 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 Min/Max 58 88 64 83 61 Temp 82 73 67 62 59 62 78 86 87 79 71 68 66 66 77 81 78 73 68 66 63 62 Dewpt 65 63 63 61 59 61 64 64 63 64 66 65 64 65 69 70 70 68 67 65 63 62 RH 56 71 87 97100 97 62 48 45 60 84 90 93 97 76 69 76 84 97 97100100 Wind dir NW N W SW SW S S W W W SW SW N N N W NW N NW N N N Wind spd 5 3 1 1 1 1 1 2 5 2 1 1 0 0 0 2 2 1 1 0 0 0 Clouds SC CL FW FW FW FW FW CL FW SC SC B1 B1 B2 B2 OV OV B1 B1 B1 B2 B2 PoP 12hr 0 5 40 90 30 QPF 12hr 0 0 0.04 0.20 0.01 Snow 12hr 00-00 00-00 00-00 Rain shwrs C C L L D D C C C Tstms S C C S Obvis PF PF PF Heat index 84 87 88 85 Max heat 84 87 88 85 83 Date 08/21 Sat 08/22/26 Sun 08/23/26 Mon 08/24/26 Tue 08/25/26 EDT 6hrly 14 20 02 08 14 20 02 08 14 20 02 08 14 20 02 08 14 20 UTC 6hrly 18 00 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 Max/Min 81 61 83 60 81 56 82 57 84 Temp 79 74 64 63 81 75 65 63 79 72 60 60 80 73 61 60 82 75 Dewpt 68 67 64 63 68 67 64 63 64 61 59 59 61 61 59 59 63 64 PWind dir E E SW SW W W W W W Wind char LT LT LT LT LT LT LT LT LT Avg clouds B2 B2 B1 B2 B1 B1 B1 SC SC FW FW FW FW FW FW SC SC SC PoP 12hr 60 30 50 30 20 5 10 5 10 Rain shwrs C L C S S C C S Tstms C S C S $$ MDZ014-190800- Annapolis MD 38.99N 76.49W Elev. 7 ft 500 PM EDT Tue Aug 18 2026 Date 08/18/26 Wed 08/19/26 Thu 08/20/26 Fri EDT 3hrly 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 UTC 3hrly 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 Min/Max 71 88 74 84 71 Temp 86 82 77 75 72 73 83 87 88 84 78 76 75 76 82 84 82 78 75 73 71 73 Dewpt 71 70 69 67 66 65 64 64 63 66 69 68 69 69 70 70 70 70 70 69 68 66 RH 61 67 76 76 81 76 53 46 43 55 74 76 82 79 67 63 67 76 84 87 90 79 Wind dir N N N N NW NW NW SW SW S SW N N N E NE NE N N N N N Wind spd 5 1 0 0 3 3 4 4 5 3 1 0 0 1 5 6 8 4 0 2 5 8 Clouds B1 FW FW FW SC SC FW FW CL CL FW SC B1 B1 SC B2 B2 B2 B1 B1 SC SC PoP 12hr 0 0 20 60 40 QPF 12hr 0 0 0.02 0.18 0.10 Snow 12hr 00-00 00-00 00-00 Rain shwrs S S S S S L L C C Tstms S S S C S Heat index 91 86 84 88 89 86 86 88 86 Max heat 91 83 88 89 83 88 87 Date 08/21 Sat 08/22/26 Sun 08/23/26 Mon 08/24/26 Tue 08/25/26 EDT 6hrly 14 20 02 08 14 20 02 08 14 20 02 08 14 20 02 08 14 20 UTC 6hrly 18 00 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 Max/Min 81 70 84 70 85 68 85 69 85 Temp 80 78 72 72 80 78 72 72 82 78 70 70 81 78 71 71 82 79 Dewpt 67 68 69 70 72 71 70 70 70 68 65 65 65 65 65 65 66 66 PWind dir NE SE E S W NW W SW S Wind char GN LT LT LT LT LT LT LT LT Avg clouds B1 B1 B2 B2 B2 B1 B1 B1 SC B1 SC FW FW FW FW SC SC SC PoP 12hr 40 60 40 50 30 5 5 10 20 Rain shwrs C L L C C C S S C S Tstms S C S C C $$