Executive summary: The Climate Impact Company (CIC) 2024 North Atlantic basin tropical cyclone (TC) season forecast projects 20 tropical storms, 10 hurricanes, and 5 intense hurricanes. The accumulative cyclone energy (ACE) index forecast is 187. The activity forecast is somewhat higher than normal. The forecast is based on strongly favorable environmental conditions including a low shear upper-level environment due to the evolution of La Nina and plentiful upper ocean heat in the deep tropics and subtropics as identified by the tropical North Atlantic (TNA) index. The projected hurricane tracks for the 2024 season based on the CIC constructed analog and climatology is dangerous featuring potential for 5 land-falling systems. Forecasts issued by Colorado State University on April 4 and Tropical Storm Risk/U.K. on April 8 are likely as active or slightly more active than the CIC projection. An extremely dangerous TC season ahead is expected. Fig. 1: The Climate Impact Company seasonal activity forecast and projected hurricane tracks for the 2024 North Atlantic basin TC season. The analog forecast: The Climate Impact Company constructed-analog (CIC-CA) forecast of North Atlantic basin tropical cyclone activity is based on ENSO and TNA years similar with projections for the 2024 season. Fortunately, the selected years are very straightforward and include 2016, 2010, 1998, and 1995. Each analog year produced an El Nino to La Nina transition with strong warm sea surface temperature anomalies (SSTA) in the North Atlantic tropics similar with the 2024 expectations. The correction bias is based on 1999-2023 CIC April forecasts and verification error bias (Fig. 2) which is +2.58 for tropical storms, +0.375 for both hurricanes and intense hurricanes, and +8.1 for ACE index. The bias values are positive due to the warming of the North Atlantic causing a tendency for seasonal forecasts to underperform (slightly). The bias is added to the constructed analog values to create the final forecast (Table 1). Fig. 2: The Climate Impact Company April seasonal forecasts for North Atlantic tropical cyclone activity and observations for 1999-2023. Tropical Storms Hurricanes Intense Hurricanes ACE Index 2016 15 7 4 141 2010 19 12 5 166 1998 14 10 3 182 1995 19 11 5 227 Average 17.0 10.0 4.25 179.0 Correction +2.58 +0.375 +0.375 +8.1 Forecast 20 10 5 187 Last Year 20 7 3 146 30-Year NML 130.4 15.5 7.5 3.4 15-Year NML 132.5 17.7 7.9 3.5 50-Year NML 107.0 13.0 6.6 2.7 Table 1: The CIC-CA North Atlantic basin 2024 seasonal tropical cyclone activity forecast.