FMUS23 KWNH 181729 PRBEHI DAYS 3--7 HEAT INDEX FORECAST TABLES NWS WEATHER PREDICTION CENTER COLLEGE PARK MD 1727 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 59 66 70 71 MEAN 54 54 53 56 60 %>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 1 %>90 0 0 0 0 0 %>85 0 0 0 1 4 %>85 0 0 0 0 0 %>80 0 0 2 6 14 %>80 0 0 0 0 0 %>75 0 1 9 22 33 %>75 0 0 0 0 1 %>70 0 4 27 49 57 %>70 0 0 0 2 5 ASHEVILLE_NC ATLANTA_GA AVL 0521 0522 0523 0524 0525 ATL 0521 0522 0523 0524 0525 MEAN 72 65 68 71 71 MEAN 79 78 78 79 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 0 0 %>90 0 0 0 0 0 %>85 0 0 0 0 0 %>85 1 2 3 3 6 %>80 4 0 1 1 2 %>80 37 28 28 36 37 %>75 25 3 7 13 19 %>75 94 80 78 86 81 %>70 69 18 33 55 61 %>70 100 99 98 99 98 BALTIMORE_MD BIRMINGHAM_AL BWI 0521 0522 0523 0524 0525 BHM 0521 0522 0523 0524 0525 MEAN 62 59 61 67 68 MEAN 79 79 78 79 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 0 0 %>90 0 0 0 1 1 %>85 0 0 0 1 1 %>85 4 4 5 8 11 %>80 0 0 1 5 5 %>80 35 35 33 41 45 %>75 1 0 3 15 18 %>75 85 85 79 83 83 %>70 8 1 12 34 41 %>70 99 99 98 98 98 BOSTON_MA BUFFALO_NY BOS 0521 0522 0523 0524 0525 BUF 0521 0522 0523 0524 0525 MEAN 57 54 53 53 55 MEAN 47 53 56 60 63 %>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 1 %>70 0 0 0 4 8 CHARLESTON_SC CHARLESTON_WV CHS 0521 0522 0523 0524 0525 CRW 0521 0522 0523 0524 0525 MEAN 83 82 83 83 82 MEAN 63 67 72 75 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 2 3 4 2 %>90 0 0 0 1 1 %>85 29 21 30 33 24 %>85 0 0 2 4 5 %>80 78 70 80 82 74 %>80 0 1 11 18 20 %>75 99 97 99 99 98 %>75 2 6 33 48 48 %>70 100 100 100 100 100 %>70 12 29 64 79 77 CHARLOTTE_NC CHICAGO_IL CLT 0521 0522 0523 0524 0525 ORD 0521 0522 0523 0524 0525 MEAN 80 70 75 77 77 MEAN 50 55 61 66 69 %>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 0 1 %>90 0 0 0 0 1 %>85 10 1 3 3 7 %>85 0 0 0 0 4 %>80 47 7 17 23 31 %>80 0 0 0 2 11%>75 87 24 49 67 68 %>75 0 0 2 9 26 %>70 99 52 81 95 92 %>70 0 0 9 27 48 CINCINNATI_OH CLEVELAND_OH LUK 0521 0522 0523 0524 0525 CLE 0521 0522 0523 0524 0525 MEAN 59 65 72 75 75 MEAN 52 59 66 70 71 %>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 1 2 %>90 0 0 0 1 2 %>85 0 0 1 5 10 %>85 0 0 1 4 7 %>80 0 1 7 19 27 %>80 0 0 5 11 17 %>75 0 5 30 47 52 %>75 0 1 14 25 33 %>70 4 21 67 77 77 %>70 0 6 32 47 55 COLUMBIA_SC COLUMBUS_OH CAE 0521 0522 0523 0524 0525 TZR 0521 0522 0523 0524 0525 MEAN 83 80 81 82 81 MEAN 56 63 70 73 74 %>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 2 1 2 2 %>90 0 0 0 0 1 %>85 28 14 18 21 20 %>85 0 0 0 3 6 %>80 77 50 64 69 63 %>80 0 0 4 14 20 %>75 98 85 95 96 93 %>75 0 3 19 38 44 %>70 100 98 100 100 100 %>70 1 13 51 69 71 DAYTON_OH DETROIT_MI MGY 0521 0522 0523 0524 0525 DET 0521 0522 0523 0524 0525 MEAN 58 64 71 74 75 MEAN 49 55 62 65 68 %>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 3 %>90 0 0 0 0 0 %>85 0 0 1 5 10 %>85 0 0 0 0 1 %>80 0 1 6 18 26 %>80 0 0 0 1 3 %>75 0 4 25 43 50 %>75 0 0 2 6 14 %>70 2 16 59 71 74 %>70 0 0 10 22 36 EVANSVILLE_IN GRAND_RAPIDS_MI EVV 0521 0522 0523 0524 0525 GRR 0521 0522 0523 0524 0525 MEAN 65 69 74 75 78 MEAN 51 54 61 64 68 %>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 3 %>90 0 0 0 0 0 %>85 0 0 3 5 12 %>85 0 0 0 0 1 %>80 0 2 15 22 35 %>80 0 0 0 1 6 %>75 3 12 43 53 65 %>75 0 0 1 4 19 %>70 17 41 76 82 88 %>70 0 0 6 17 41 GREENSBORO_NC HUNTSVILLE_AL GSO 0521 0522 0523 0524 0525 HSV 0521 0522 0523 0524 0525 MEAN 75 64 71 74 75 MEAN 76 77 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 0 1 %>90 0 0 0 0 0 %>85 5 0 1 2 5 %>85 1 1 2 4 5 %>80 20 1 8 14 21 %>80 17 18 18 27 31 %>75 50 5 25 44 51 %>75 63 67 64 70 74 %>70 80 19 53 78 80 %>70 95 97 95 95 96 INDIANAPOLIS_IN KNOXVILLE_TN IND 0521 0522 0523 0524 0525 TYS 0521 0522 0523 0524 0525 MEAN 58 62 70 73 74 MEAN 77 76 76 77 77 %>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 2 %>90 1 0 0 1 1 %>85 0 0 1 4 8 %>85 7 3 4 7 8 %>80 0 0 5 14 23 %>80 26 18 20 28 31 %>75 0 2 21 36 47 %>75 61 56 57 63 66 %>70 1 9 52 64 73 %>70 88 89 88 90 91LEXINGTON_KY LOUISVILLE_KY LEX 0521 0522 0523 0524 0525 SDF 0521 0522 0523 0524 0525 MEAN 63 68 73 74 75 MEAN 64 69 75 76 77 %>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 0 %>90 0 0 0 1 4 %>85 0 0 0 1 4 %>85 0 0 3 8 14 %>80 0 1 4 10 18 %>80 0 3 16 26 36 %>75 2 8 30 41 50 %>75 3 14 46 56 64 %>70 11 35 77 80 81 %>70 16 42 80 83 85 MEMPHIS_TN MIAMI_FL MEM 0521 0522 0523 0524 0525 MIA 0521 0522 0523 0524 0525 MEAN 75 76 77 77 78 MEAN 88 89 90 90 90 %>100 0 0 0 0 0 %>100 0 1 2 3 3 %>95 0 0 0 0 0 %>95 5 7 12 16 15 %>90 0 0 0 0 1 %>90 27 36 45 50 48 %>85 1 0 4 6 9 %>85 75 82 86 86 86 %>80 11 11 24 29 38 %>80 98 99 99 99 99 %>75 47 56 66 69 77 %>75 100 100 100 100 100 %>70 86 94 94 94 96 %>70 100 100 100 100 100 MILWAUKEE_WI MOBILE_AL MKE 0521 0522 0523 0524 0525 MOB 0521 0522 0523 0524 0525 MEAN 46 50 55 59 63 MEAN 82 83 84 84 84 %>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 0 %>90 0 2 7 7 10 %>85 0 0 0 0 0 %>85 19 26 38 39 41 %>80 0 0 0 0 2 %>80 80 80 82 82 79 %>75 0 0 0 1 6 %>75 99 99 98 98 97 %>70 0 0 0 4 18 %>70 100 100 100 100 100 NASHVILLE_TN NEW_YORK_CITY_NY BNA 0521 0522 0523 0524 0525 NYC 0521 0522 0523 0524 0525 MEAN 73 75 76 77 78 MEAN 62 58 56 60 63 %>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 1 %>90 0 0 0 0 0 %>85 0 1 2 5 9 %>85 0 0 0 0 0 %>80 5 13 18 25 35 %>80 0 0 0 0 0 %>75 34 50 57 65 72 %>75 1 0 0 1 3 %>70 78 87 90 92 94 %>70 6 0 0 6 12 NORFOLK_VA ORLANDO_FL ORF 0521 0522 0523 0524 0525 ORL 0521 0522 0523 0524 0525 MEAN 72 66 72 73 73 MEAN 85 86 88 88 88 %>100 0 0 0 0 0 %>100 0 0 0 0 0 %>95 0 0 0 0 0 %>95 0 0 2 4 2 %>90 0 0 0 0 1 %>90 2 10 26 31 24 %>85 2 0 1 2 4 %>85 46 67 81 78 76 %>80 10 0 6 11 15 %>80 97 98 99 98 98 %>75 28 2 27 37 39 %>75 100 100 100 100 100 %>70 58 15 65 73 71 %>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 57 63 66 MEAN 56 60 65 70 72 %>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 1 %>85 0 0 0 0 0 %>85 0 0 0 2 5 %>80 0 0 0 2 3 %>80 0 0 2 8 15 %>75 1 0 1 8 10 %>75 0 1 8 25 36 %>70 6 1 5 20 27 %>70 0 5 23 52 62 PORTLAND_ME PROVIDENCE_RI PWM 0521 0522 0523 0524 0525 PVD 0521 0522 0523 0524 0525 MEAN 52 51 50 50 51 MEAN 59 55 53 55 58 %>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 0 %>70 0 0 0 0 0 %>70 1 0 0 0 2 RALEIGH-DURHAM_NC RICHMOND_VA RDU 0521 0522 0523 0524 0525 RIC 0521 0522 0523 0524 0525 MEAN 78 69 76 78 78 MEAN 68 61 68 73 74 %>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 1 1 3 %>90 0 0 0 1 3 %>85 11 1 6 7 14 %>85 0 0 1 6 10 %>80 39 5 24 33 38 %>80 3 0 6 19 24 %>75 74 19 57 71 69 %>75 14 0 18 41 47 %>70 94 45 85 94 90 %>70 38 2 41 67 71 SAVANNAH_GA TALLAHASSEE_FL SAV 0521 0522 0523 0524 0525 TLH 0521 0522 0523 0524 0525 MEAN 83 83 84 84 83 MEAN 85 85 85 86 86 %>100 0 0 0 0 0 %>100 0 0 0 0 0 %>95 0 0 0 0 0 %>95 0 0 0 1 2 %>90 2 1 2 4 3 %>90 5 3 8 15 17 %>85 25 22 32 39 31 %>85 47 43 54 60 55 %>80 81 81 89 89 82 %>80 94 94 95 94 89 %>75 99 99 100 100 99 %>75 100 100 100 100 99 %>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 89 90 90 90 MEAN 63 58 62 68 70 %>100 0 0 1 4 3 %>100 0 0 0 0 0 %>95 3 7 12 20 16 %>95 0 0 0 0 0 %>90 25 38 48 53 47 %>90 0 0 0 0 0 %>85 72 81 86 84 81 %>85 0 0 0 2 2 %>80 97 98 98 97 96 %>80 0 0 1 7 9 %>75 100 100 100 100 100 %>75 2 0 5 20 24 %>70 100 100 100 100 100 %>70 10 1 17 40 48 URL IS WWW.WPC.NCEP.NOAA.GOV $$