Jane's reports that Sdot Micha airbase is Israel's primary storage and deployment site for its Jericho I and II ballistic missiles tipped with nuclear warheads. [1] Constructed during the late 1960s, the facility became operational in the early 1970s. Upon completion, the bunkers housed Jericho I ballistic missiles on mobile launchers. [2] Between 1989 and 1993, Israel built additional bunkers to the southeast for Jericho II ballistic missiles. [3] Satellite reconnaissance has not indicated the presence of launch silos on-site, suggesting that the Jericho II's are exclusively stored underground on mobile launchers. [4] The IDF transports Jericho II's to the base from the IAI's nearby missile production facility at Be'er Yaakov via rail. [5] Jane's speculates that Sdot Micha houses at least 50 and up to 100 Jericho IIs. [6]

Sources:
[1] "Israel Nuclear Production Capability," Jane's CBRN Assessments, 1 December 2009.
[2] Joseph Cirincione, Jon B. Wolfstahl and Miriam Rajkumar, Deadly Arsenals: Nuclear, Biological, and Chemical Threats (Washington, DC: Carnegie Endowment for International Peace, 2005), p. 269.
[3] Joseph Cirincione, Jon B. Wolfstahl and Miriam Rajkumar, Deadly Arsenals: Nuclear, Biological, and Chemical Threats (Washington, DC: Carnegie Endowment for International Peace, 2005), p. 269.
[4] "Jericho 1/2/3 (YA-1/YA-3)," Jane's Strategic Weapon Systems, 3 August 2009.
[5] Harold Hough, "Israel's Nuclear Infrastructure," Jane's Intelligence Review, 1 November 1994.
[6] Harold Hough, "Israel's Nuclear Infrastructure," Jane's Intelligence Review, 1 November 1994; Joseph Cirincione, Jon B. Wolfstahl, and Miriam Rajkumar, Deadly Arsenals: Nuclear, Biological, and Chemical Threats (Washington, DC: Carnegie Endowment for International Peace, 2005), p. 269.