FMUS23 KWNH 180653 PRBEHI DAYS 3--7 HEAT INDEX FORECAST TABLES NWS WEATHER PREDICTION CENTER COLLEGE PARK MD 0652 UTC MON MAY 18 2026 MEAN HEAT INDEX (DEG F) AND MEAN HI PROB (%) FRCSTS AT EASTERN US CITIES - DAYS 3 TO 7 FROM MON MAY 18 2026 AKRON-CANTON_OH ALBANY_NY CAK 0521 0522 0523 0524 0525 ALB 0521 0522 0523 0524 0525 MEAN 53 60 66 69 72 MEAN 54 54 55 58 61 %>100 0 0 0 0 0 %>100 0 0 0 0 0 %>95 0 0 0 0 0 %>95 0 0 0 0 0 %>90 0 0 0 0 2 %>90 0 0 0 0 0 %>85 0 0 0 1 7 %>85 0 0 0 0 0 %>80 0 0 2 5 18 %>80 0 0 0 0 0 %>75 0 2 8 20 38 %>75 0 0 0 2 2 %>70 0 8 25 47 62 %>70 0 0 1 7 8 ASHEVILLE_NC ATLANTA_GA AVL 0521 0522 0523 0524 0525 ATL 0521 0522 0523 0524 0525 MEAN 71 65 68 71 71 MEAN 79 77 77 78 78 %>100 0 0 0 0 0 %>100 0 0 0 0 0 %>95 0 0 0 0 0 %>95 0 0 0 0 0 %>90 0 0 0 0 0 %>90 0 0 0 0 0 %>85 0 0 0 0 0 %>85 1 1 2 3 6 %>80 2 0 0 2 3 %>80 31 19 22 29 31 %>75 15 2 5 16 18 %>75 89 71 68 77 72 %>70 58 14 30 56 57 %>70 100 97 96 98 95 BALTIMORE_MD BIRMINGHAM_AL BWI 0521 0522 0523 0524 0525 BHM 0521 0522 0523 0524 0525 MEAN 62 59 64 69 70 MEAN 78 78 78 78 79 %>100 0 0 0 0 0 %>100 0 0 0 0 0 %>95 0 0 0 0 0 %>95 0 0 0 0 0 %>90 0 0 0 1 0 %>90 0 0 0 1 1 %>85 0 0 1 2 2 %>85 2 2 4 8 11 %>80 0 0 3 9 9 %>80 31 27 29 35 39 %>75 1 0 10 23 24 %>75 84 80 73 75 75 %>70 9 1 24 44 48 %>70 99 99 96 96 95 BOSTON_MA BUFFALO_NY BOS 0521 0522 0523 0524 0525 BUF 0521 0522 0523 0524 0525 MEAN 57 54 53 55 57 MEAN 47 54 58 61 64 %>100 0 0 0 0 0 %>100 0 0 0 0 0 %>95 0 0 0 0 0 %>95 0 0 0 0 0 %>90 0 0 0 0 0 %>90 0 0 0 0 0 %>85 0 0 0 0 0 %>85 0 0 0 0 0 %>80 0 0 0 0 0 %>80 0 0 0 0 1 %>75 0 0 0 0 0 %>75 0 0 0 1 4 %>70 0 0 0 1 2 %>70 0 0 3 7 17 CHARLESTON_SC CHARLESTON_WV CHS 0521 0522 0523 0524 0525 CRW 0521 0522 0523 0524 0525 MEAN 83 81 83 83 82 MEAN 61 67 72 74 76 %>100 0 0 0 0 0 %>100 0 0 0 0 0 %>95 0 0 0 1 0 %>95 0 0 0 0 0 %>90 2 0 5 8 4 %>90 0 0 0 0 2 %>85 24 11 31 36 27 %>85 0 0 2 3 9 %>80 76 60 73 76 70 %>80 0 1 9 16 27 %>75 99 96 97 97 96 %>75 1 7 31 45 53 %>70 100 100 100 100 100 %>70 7 27 62 77 78 CHARLOTTE_NC CHICAGO_IL CLT 0521 0522 0523 0524 0525 ORD 0521 0522 0523 0524 0525 MEAN 79 70 74 77 77 MEAN 51 57 63 68 72 %>100 0 0 0 0 0 %>100 0 0 0 0 0 %>95 0 0 0 0 0 %>95 0 0 0 0 1 %>90 1 0 0 1 1 %>90 0 0 0 0 2 %>85 8 1 3 6 7 %>85 0 0 0 1 7 %>80 42 7 16 27 28 %>80 0 0 1 5 18%>75 83 23 45 63 63 %>75 0 0 4 16 37 %>70 98 50 76 90 89 %>70 0 1 17 37 60 CINCINNATI_OH CLEVELAND_OH LUK 0521 0522 0523 0524 0525 CLE 0521 0522 0523 0524 0525 MEAN 60 65 72 74 77 MEAN 52 61 66 69 73 %>100 0 0 0 0 0 %>100 0 0 0 0 0 %>95 0 0 0 0 1 %>95 0 0 0 0 1 %>90 0 0 0 1 4 %>90 0 0 0 1 4 %>85 0 0 1 5 14 %>85 0 0 1 2 10 %>80 0 1 5 19 33 %>80 0 0 3 8 21 %>75 1 5 25 46 58 %>75 0 2 11 22 39 %>70 4 21 63 75 80 %>70 0 9 28 43 59 COLUMBIA_SC COLUMBUS_OH CAE 0521 0522 0523 0524 0525 TZR 0521 0522 0523 0524 0525 MEAN 83 79 80 82 81 MEAN 57 63 69 73 75 %>100 0 0 0 0 0 %>100 0 0 0 0 0 %>95 0 0 0 0 0 %>95 0 0 0 0 0 %>90 3 1 1 3 2 %>90 0 0 0 0 2 %>85 29 12 14 22 18 %>85 0 0 0 3 9 %>80 79 44 53 63 57 %>80 0 0 2 12 25 %>75 99 81 89 93 90 %>75 0 3 14 36 49 %>70 100 97 99 99 99 %>70 1 14 45 67 74 DAYTON_OH DETROIT_MI MGY 0521 0522 0523 0524 0525 DET 0521 0522 0523 0524 0525 MEAN 58 64 71 74 76 MEAN 50 56 63 66 69 %>100 0 0 0 0 0 %>100 0 0 0 0 0 %>95 0 0 0 0 1 %>95 0 0 0 0 0 %>90 0 0 0 1 5 %>90 0 0 0 0 0 %>85 0 0 0 5 14 %>85 0 0 0 0 1 %>80 0 1 4 18 32 %>80 0 0 0 1 6 %>75 0 4 20 43 55 %>75 0 0 2 6 19 %>70 2 18 54 71 77 %>70 0 1 12 23 43 EVANSVILLE_IN GRAND_RAPIDS_MI EVV 0521 0522 0523 0524 0525 GRR 0521 0522 0523 0524 0525 MEAN 65 68 74 76 79 MEAN 50 55 62 66 70 %>100 0 0 0 0 0 %>100 0 0 0 0 0 %>95 0 0 0 0 1 %>95 0 0 0 0 0 %>90 0 0 0 1 4 %>90 0 0 0 0 0 %>85 0 0 3 6 17 %>85 0 0 0 0 2 %>80 0 1 15 25 41 %>80 0 0 0 2 8 %>75 2 10 42 57 70 %>75 0 0 2 8 23 %>70 15 37 74 85 90 %>70 0 0 10 26 47 GREENSBORO_NC HUNTSVILLE_AL GSO 0521 0522 0523 0524 0525 HSV 0521 0522 0523 0524 0525 MEAN 73 64 70 75 75 MEAN 76 76 76 77 78 %>100 0 0 0 0 0 %>100 0 0 0 0 0 %>95 0 0 0 0 0 %>95 0 0 0 0 0 %>90 1 0 0 1 1 %>90 0 0 0 0 0 %>85 4 0 2 5 5 %>85 1 0 1 2 5 %>80 16 1 8 19 21 %>80 11 10 13 20 30 %>75 39 5 26 49 49 %>75 56 56 58 64 71 %>70 68 19 53 79 78 %>70 94 95 94 94 95 INDIANAPOLIS_IN KNOXVILLE_TN IND 0521 0522 0523 0524 0525 TYS 0521 0522 0523 0524 0525 MEAN 58 63 70 73 76 MEAN 75 75 75 76 76 %>100 0 0 0 0 0 %>100 0 0 0 0 0 %>95 0 0 0 0 1 %>95 0 0 0 0 0 %>90 0 0 0 1 3 %>90 0 0 0 0 1 %>85 0 0 1 4 12 %>85 2 2 2 4 5 %>80 0 0 5 16 29 %>80 16 16 14 21 24 %>75 0 3 21 39 54 %>75 51 51 49 57 60 %>70 1 14 51 66 77 %>70 86 86 86 88 89LEXINGTON_KY LOUISVILLE_KY LEX 0521 0522 0523 0524 0525 SDF 0521 0522 0523 0524 0525 MEAN 62 67 72 74 75 MEAN 64 68 74 76 78 %>100 0 0 0 0 0 %>100 0 0 0 0 0 %>95 0 0 0 0 0 %>95 0 0 0 0 1 %>90 0 0 0 0 1 %>90 0 0 0 2 6 %>85 0 0 0 1 4 %>85 0 0 3 8 18 %>80 0 0 2 10 20 %>80 0 2 16 27 40 %>75 1 6 22 40 51 %>75 3 12 44 57 67 %>70 8 29 70 79 82 %>70 14 38 76 83 87 MEMPHIS_TN MIAMI_FL MEM 0521 0522 0523 0524 0525 MIA 0521 0522 0523 0524 0525 MEAN 72 74 76 77 79 MEAN 87 89 90 91 90 %>100 0 0 0 0 0 %>100 0 1 4 5 4 %>95 0 0 0 0 0 %>95 4 9 17 20 18 %>90 0 0 0 0 1 %>90 26 37 50 55 51 %>85 0 0 2 4 11 %>85 71 79 86 87 86 %>80 2 5 18 27 42 %>80 96 97 98 98 99 %>75 24 41 60 70 80 %>75 100 100 100 100 100 %>70 71 88 92 95 97 %>70 100 100 100 100 100 MILWAUKEE_WI MOBILE_AL MKE 0521 0522 0523 0524 0525 MOB 0521 0522 0523 0524 0525 MEAN 47 52 57 61 66 MEAN 82 82 83 83 82 %>100 0 0 0 0 0 %>100 0 0 0 0 0 %>95 0 0 0 0 0 %>95 0 0 0 1 1 %>90 0 0 0 0 0 %>90 0 0 3 7 7 %>85 0 0 0 0 1 %>85 9 14 26 34 31 %>80 0 0 0 0 4 %>80 74 73 74 74 69 %>75 0 0 0 2 12 %>75 100 99 97 96 93 %>70 0 0 1 9 29 %>70 100 100 100 100 99 NASHVILLE_TN NEW_YORK_CITY_NY BNA 0521 0522 0523 0524 0525 NYC 0521 0522 0523 0524 0525 MEAN 71 74 75 76 78 MEAN 62 57 59 63 64 %>100 0 0 0 0 0 %>100 0 0 0 0 0 %>95 0 0 0 0 0 %>95 0 0 0 0 0 %>90 0 0 0 0 2 %>90 0 0 0 0 0 %>85 0 0 1 4 11 %>85 0 0 0 0 0 %>80 1 6 11 22 37 %>80 0 0 0 1 1 %>75 16 37 50 61 72 %>75 1 0 1 5 7 %>70 63 83 90 91 93 %>70 8 0 4 16 21 NORFOLK_VA ORLANDO_FL ORF 0521 0522 0523 0524 0525 ORL 0521 0522 0523 0524 0525 MEAN 71 66 75 77 75 MEAN 85 86 88 88 87 %>100 0 0 0 0 0 %>100 0 0 0 0 0 %>95 0 0 0 1 1 %>95 0 0 3 5 3 %>90 0 0 2 5 3 %>90 4 12 28 32 23 %>85 1 0 7 14 10 %>85 48 64 75 77 68 %>80 5 0 21 32 25 %>80 96 97 98 97 96 %>75 21 2 46 58 49 %>75 100 100 100 100 100 %>70 54 18 75 83 75 %>70 100 100 100 100 100 PHILADELPHIA_PA PITTSBURGH_PA PHL 0521 0522 0523 0524 0525 PIT 0521 0522 0523 0524 0525 MEAN 62 58 61 66 67 MEAN 56 61 66 71 73 %>100 0 0 0 0 0 %>100 0 0 0 0 0 %>95 0 0 0 0 0 %>95 0 0 0 0 0 %>90 0 0 0 0 0 %>90 0 0 0 0 2 %>85 0 0 0 2 1 %>85 0 0 1 2 7 %>80 0 0 1 5 5 %>80 0 0 4 10 19 %>75 2 0 4 15 15 %>75 0 3 13 27 40 %>70 10 1 14 31 34 %>70 1 11 31 54 63 PORTLAND_ME PROVIDENCE_RI PWM 0521 0522 0523 0524 0525 PVD 0521 0522 0523 0524 0525 MEAN 53 50 50 50 52 MEAN 60 54 54 57 59 %>100 0 0 0 0 0 %>100 0 0 0 0 0 %>95 0 0 0 0 0 %>95 0 0 0 0 0 %>90 0 0 0 0 0 %>90 0 0 0 0 0 %>85 0 0 0 0 0 %>85 0 0 0 0 0 %>80 0 0 0 0 0 %>80 0 0 0 0 0 %>75 0 0 0 0 0 %>75 0 0 0 0 1 %>70 0 0 0 0 0 %>70 1 0 0 3 5 RALEIGH-DURHAM_NC RICHMOND_VA RDU 0521 0522 0523 0524 0525 RIC 0521 0522 0523 0524 0525 MEAN 77 68 76 78 78 MEAN 66 62 71 76 75 %>100 0 0 0 0 0 %>100 0 0 0 0 0 %>95 0 0 0 0 0 %>95 0 0 0 1 1 %>90 1 0 1 3 3 %>90 0 0 1 4 3 %>85 9 1 7 13 14 %>85 0 0 4 13 11 %>80 33 4 25 39 37 %>80 2 0 12 30 27 %>75 68 16 54 70 67 %>75 10 1 29 54 51 %>70 91 41 81 91 89 %>70 29 6 54 77 74 SAVANNAH_GA TALLAHASSEE_FL SAV 0521 0522 0523 0524 0525 TLH 0521 0522 0523 0524 0525 MEAN 82 82 84 84 83 MEAN 84 84 85 86 85 %>100 0 0 0 0 0 %>100 0 0 0 0 0 %>95 0 0 0 0 0 %>95 0 0 1 3 2 %>90 1 1 6 7 6 %>90 2 1 10 18 15 %>85 19 21 38 41 34 %>85 38 33 50 54 48 %>80 79 76 84 85 77 %>80 93 92 91 87 82 %>75 99 99 99 99 97 %>75 100 100 100 98 97 %>70 100 100 100 100 100 %>70 100 100 100 100 100 TAMPA_FL WASHINGTON_DC TPA 0521 0522 0523 0524 0525 DCA 0521 0522 0523 0524 0525 MEAN 87 88 89 90 89 MEAN 62 58 65 70 71 %>100 0 0 0 3 2 %>100 0 0 0 0 0 %>95 2 3 7 16 12 %>95 0 0 0 0 0 %>90 23 27 38 47 41 %>90 0 0 0 1 1 %>85 71 77 80 80 77 %>85 0 0 1 4 4 %>80 97 98 98 96 95 %>80 0 0 4 12 12 %>75 100 100 100 100 100 %>75 1 0 13 28 29 %>70 100 100 100 100 100 %>70 9 1 29 50 53 URL IS WWW.WPC.NCEP.NOAA.GOV $$