A weather seal for a gap between adjacent first and second glazing panels (98, 100) held to a structure, comprising: a first wall along a length of the weather seal; a second wall extending next to the first wall along the length of the first wall; a web wall joining the first wall and the second wall, the first wall and the second wall spaced from one another; a first coupling disposed along a first side of the first wall and the second wall, the first coupling attaching to the structure between the gap; a second coupling disposed along a second side of the first wall and the second wall distal to the first side, the second coupling (50, 60) configured to be attached to a cap; a first seal member extending from the first wall in a direction distal to the second wall and intermediate the first coupling and the second coupling; a second seal member extending from the second wall in a direction distal to the first wall and intermediate the first coupling and the second coupling; wherein the weather seal is configured for at least partially bridging the gap with the first seal member contacting a side edge of the first glazing panel and the second seal member contacting a side edge of the second glazing panel, wherein the first seal member is a first fin and the second seal member is a second fin, the first fin extending from the first wall in a direction perpendicular thereto and distal to the second wall, and the second fin extending from the second wall in a direction perpendicular thereto and distal to the first wall, characterized in that the weather seal further comprises at least one sealing bulb (80A, 80B) extending from the first wall proximate the second coupling, the at least one sealing bulb (80A, 80B) having a hollow therein and capable of deforming when pressed into the gap, wherein the at least one sealing bulb includes a first sealing bulb and a second sealing bulb, the first sealing bulb extending from the first wall in a direction perpendicular thereto and distal to the second wall, the second sealing bulb extending from the second wall in a direction perpendicular thereto, and distal to the first wall, wherein the first sealing bulb and the second sealing bulb have a cross-section approximating an egg shape, with a first portion having a smaller diameter than a second portion, the first portions leading the first and second sealing bulbs into the gap before the second portions when the weather seal is installed in the gap, wherein the second coupling is a second receiver and further including an extension from a wall of each of the first and second sealing bulbs (80A, 80B), the extensions extending in a direction toward one another to define a split over the second receiver. a first wall along a length of the weather seal; a second wall extending next to the first wall along the length of the first wall; a web wall joining the first wall and the second wall, the first wall and the second wall spaced from one another; a first coupling disposed along a first side of the first wall and the second wall, the first coupling attaching to the structure between the gap; a second coupling disposed along a second side of the first wall and the second wall distal to the first side, the second coupling (50, 60) configured to be attached to a cap; a first seal member extending from the first wall in a direction distal to the second wall and intermediate the first coupling and the second coupling; a second seal member extending from the second wall in a direction distal to the first wall and intermediate the first coupling and the second coupling; wherein the weather seal is configured for at least partially bridging the gap with the first seal member contacting a side edge of the first glazing panel and the second seal member contacting a side edge of the second glazing panel, wherein the first seal member is a first fin and the second seal member is a second fin, the first fin extending from the first wall in a direction perpendicular thereto and distal to the second wall, and the second fin extending from the second wall in a direction perpendicular thereto and distal to the first wall, characterized in that the weather seal further comprises at least one sealing bulb (80A, 80B) extending from the first wall proximate the second coupling, the at least one sealing bulb (80A, 80B) having a hollow therein and capable of deforming when pressed into the gap, wherein the at least one sealing bulb includes a first sealing bulb and a second sealing bulb, the first sealing bulb extending from the first wall in a direction perpendicular thereto and distal to the second wall, the second sealing bulb extending from the second wall in a direction perpendicular thereto, and distal to the first wall, wherein the first sealing bulb and the second sealing bulb have a cross-section approximating an egg shape, with a first portion having a smaller diameter than a second portion, the first portions leading the first and second sealing bulbs into the gap before the second portions when the weather seal is installed in the gap, wherein the second coupling is a second receiver and further including an extension from a wall of each of the first and second sealing bulbs (80A, 80B), the extensions extending in a direction toward one another to define a split over the second receiver.