We report on an extreme density enhancement and scintillation at dawn, observed within the equatorial ionization anomaly (EIA) region, which was accompanied by a convective ionosphere storm (CIS). A region of Central America experienced an increase in total electron content (TEC) of up to $\sim$50 TECu, starting at a sunrise at the magnetic conjugate footpoints. The enhanced EIA expanded poleward and westward with the local sunrise terminator. Amplitude and phase scintillation at Global Positioning system (GPS) frequencies emerged with the TEC enhancement, and moved with the expanding EIA. The scintillation lasted for $\sim$5 hours, and decayed away in 2 hours after local sunrise.