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A protective shelter includes an enclosure having at least a floor, at least one sidewall coupled to the floor, a door, and a roof coupled to the at least one sidewall. The roof includes an aperture located proximate the shelter's point of minimum static air pressure during a high-velocity wind even

A protective shelter includes an enclosure having at least a floor, at least one sidewall coupled to the floor, a door, and a roof coupled to the at least one sidewall. The roof includes an aperture located proximate the shelter's point of minimum static air pressure during a high-velocity wind event. The protective shelter includes one or more members that elevate the floor above a substrate, a substantially enclosed sub-floor region bounded by the protective shelter and the substrate, and an air duct providing airflow communication between the substantially enclosed sub-floor region and an exterior region of the enclosure via the aperture.

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1. A protective shelter, comprising: an enclosure having at least a floor, at least one sidewall coupled to the floor, a door, and a roof coupled to the at least one sidewall, wherein the roof includes an aperture located proximate the shelter's point of minimum static air pressure during a high-vel

1. A protective shelter, comprising: an enclosure having at least a floor, at least one sidewall coupled to the floor, a door, and a roof coupled to the at least one sidewall, wherein the roof includes an aperture located proximate the shelter's point of minimum static air pressure during a high-velocity wind event; one or more members that elevate the floor above a substrate, wherein when the protective shelter is deployed on the substrate a substantially enclosed sub-floor region is formed that is bounded by the protective shelter and the substrate;an air duct providing airflow communication between the substantially enclosed sub-floor region and an exterior region of the enclosure via the aperture; anda subfloor below and spaced from the floor of the enclosure; and a ballast disposed between the subfloor and floor. 2. The protective shelter of claim 1, wherein the enclosure comprises metal plate. 3. The protective shelter of claim 1, wherein the roof has at least one edge region having a decreasing height at points further from a central axis of the enclosure. 4. The protective shelter of claim 1, and further comprising at least one ground anchor coupling the protective shelter to the substrate. 5. The protective shelter of claim 1, and further comprising a structure coupled to an exterior of the enclosure that increases wind velocity adjacent the aperture. 6. The protective shelter of claim 1, wherein the ballast comprises concrete. 7. The protective shelter of claim 1, wherein the subfloor bounds the substantially enclosed subfloor region. 8. The protective shelter of claim 1, wherein: the enclosure has an interior volume; andthe air duct extends through the interior volume of the enclosure. 9. The protective shelter of claim 1, wherein the one or more members include multiple rails. 10. An assembly, comprising: a protective shelter in accordance with claim 1; anda transport bearing the protective shelter. 11. A protective shelter, comprising: an enclosure having at least a floor, at least one sidewall coupled to the floor, a door, and a roof coupled to the at least one sidewall;one or more members that elevate the floor above a substrate; a subfloor disposed below and spaced from the floor of the enclosure and spaced from the substrate;a ballast disposed between the subfloor and floor;the protective shelter and the substrate bound a substantially enclosed sub-floor region; the roof includes an aperture located proximate the shelter's point of minimum static air pressure during a high-velocity wind event; andthe protective shelter further includes an air duct providing airflow communication between the substantially enclosed sub-floor region and an exterior region of the enclosure via the aperture. 12. The protective shelter of claim 11, wherein the subfloor bounds the substantially enclosed subfloor region. 13. The protective shelter of claim 11, and further comprising a structure coupled to an exterior of the enclosure that increases wind velocity adjacent the aperture. 14. The protective shelter of claim 11, wherein: the enclosure has an interior volume; andthe air duct extends through the interior volume of the enclosure. 15. The protective shelter of claim 11, wherein the enclosure comprises metal plate. 16. The protective shelter of claim 11, wherein the roof has at least one edge region having a decreasing height at points further from a central axis of the enclosure. 17. The protective shelter of claim 11, and further comprising at least one ground anchor coupling the protective shelter to the substrate. 18. The protective shelter of claim 11, wherein the ballast comprises concrete. 19. The protective shelter of claim 11, and further comprising at least one resilient grouser attached to one or more of the one or more members. 20. The protective shelter of claim 11, wherein the one or more members include multiple rails. 21. An assembly, comprising: a protective shelter in accordance with claim 11; anda transport bearing the protective shelter. 22. A protective shelter, comprising: an enclosure having at least a floor, at least one sidewall coupled to the floor, a door, and a roof coupled to the at least one sidewall;one or more members that elevate the floor above a substrate;a resilient grouser attached to at least one of the one or more members and in contact with the substrate;the protective shelter and the substrate bound a substantially enclosed sub-floor region;the roof includes an aperture located proximate the shelter's point of minimum static air pressure during a high-velocity wind event; andthe protective shelter further includes an air duct providing airflow communication between the substantially enclosed sub-floor region and an exterior region of the enclosure via the aperture. 23. The protective shelter of claim 22, and further comprising a subfloor that is spaced from the floor and that bounds the substantially enclosed subfloor region. 24. The protective shelter of claim 22, and further comprising a ballast disposed between the subfloor and floor. 25. The protective shelter of claim 24, wherein the ballast comprises concrete. 26. The protective shelter of claim 22, and further comprising a structure coupled to an exterior of the enclosure that increases wind velocity adjacent the aperture. 27. The protective shelter of claim 22, wherein: the enclosure has an interior volume; andthe air duct extends through the interior volume of the enclosure. 28. The protective shelter of claim 22, wherein the enclosure comprises metal plate. 29. The protective shelter of claim 22, wherein the roof has at least one edge region having a decreasing height at points further from a central axis of the enclosure. 30. The protective shelter of claim 22, and further comprising at least one ground anchor coupling the protective shelter to the substrate. 31. The protective shelter of claim 22, wherein the one or more members include multiple rails. 32. An assembly, comprising: a protective shelter in accordance with claim 22; anda transport bearing the protective shelter. 33. A method of deploying a protective shelter, said method comprising: transporting, to an installation site having a substrate, a protective shelter including: an enclosure having at least a floor, at least one sidewall coupled to the floor, a door, and a roof coupled to the at least one sidewall, wherein the roof includes an aperture located proximate the shelter's point of minimum static air pressure during a high-velocity wind event;one or more members that elevate the floor above a substrate;an air duct; andplacing the protective shelter on the substrate to form a substantially enclosed sub-floor region bounded by the protective shelter and the substrate, wherein the protective shelter provides airflow communication between the substantially enclosed sub-floor region and an exterior region of the enclosure via the aperture. 34. A method of deploying a protective shelter, said method comprising: transporting, to an installation site having a substrate, a protective shelter including:an enclosure having at least a floor, at least one sidewall coupled to the floor, a door, and a roof coupled to the at least one sidewall;one or more members that elevate the floor above a substrate; a subfloor disposed below and spaced from the floor of the enclosure and spaced from the substrate;a ballast disposed between the subfloor and floor;an air duct providing airflow communication between the substantially enclosed sub-floor region and an exterior region of the enclosure via an aperture in the roof;and placing the protective shelter on the substrate. 35. A method of deploying a protective shelter, said method comprising: transporting, to an installation site having a substrate, a protective shelter including:an enclosure having at least a floor, at least one sidewall coupled to the floor, a door, and a roof coupled to the at least one sidewall;one or more members that elevate the floor above a substrate; and a resilient grouser attached to at least one of the one or more members;an air duct providing airflow communication between the substantially enclosed sub-floor region and an exterior region of the enclosure via an aperture in the roof;placing the protective shelter on the substrate with the resilient grouser in contact with the substrate. 36. A protective shelter, comprising: an enclosure having at least a floor, at least one sidewall coupled to the floor, a door, and a roof coupled to the at least one sidewall, wherein the roof includes an aperture located proximate the shelter's point of minimum static air pressure during a high-velocity wind event; one or more members that elevate the floor above a substrate, wherein when the protective shelter is deployed on the substrate a substantially enclosed sub-floor region is formed that is bounded by the protective shelter and the substrate;an air duct providing airflow communication between the substantially enclosed sub-floor region and an exterior region of the enclosure via the aperture; andat least one resilient grouser attached to one or more of the one or more members.