Why did Congress move the US weather service from the Army Signal Service to the civilian Department of Agriculture in 1890–91?

claim-1890-91-weather-service-transferred-to-agriculture-at-harrisons-request records the fact of the transfer and its sponsor (President Benjamin Harrison) from the NWS's own Tier-1 timeline, but that primary source gives no stated rationale for the change. Secondary sources gesture at "civilian control" as the motive; the capture deliberately declined to assert that on weak sourcing. This question holds the gap open so the claim-note can stay honest about what it does and doesn't support.

What would answer it

• The text of the enabling act itself (the 1890 act creating the Weather Bureau in the Department of Agriculture) and any accompanying congressional committee reports stating purpose.
• Harrison's own message(s) to Congress requesting the transfer — a presidential rationale in his own words.
• Contemporary accounts of the Allison Commission (1884–86) and the broader debate over military vs. civilian control of federal scientific bureaus, which is the likely policy context.
• Scholarly histories of the Weather Bureau (e.g. Whitnah, A History of the United States Weather Bureau) that cite the primary debate.

Why it matters

The military-to-civilian handoff is the pivot that turned a telegraph-era Army operation (claim-us-national-weather-service-born-1870-inside-army-signal-service) into the civilian science agency that survives as today's National Weather Service. If a stated rationale can be pinned to primary sources, the transfer note can go beyond seedling and the institutional arc gains its causal middle.