The Southwestern United States was facing heavy rain and the potential for flash flooding through early Wednesday as moisture from two far-off storms streamed into the region. The flood threat was focused over New Mexico and Arizona on Monday and will begin to shift east into Texas and the Plains Tuesday into Thursday. One to three inches of rain was forecast to fall across much of the region, including in parts of Arizona, New Mexico, Nevada, Utah, Colorado and Texas, and some isolated areas could receive up to seven inches. Flood watches were in effect, and forecasters said more urgent flash-flood warnings were likely over the next few days.

Other Hurricane Polo news:

• The Washington Post: Life-threatening flash floods may soon hit the Southwest, driven by Polo remnants
• CBS News: Hurricane Polo makes landfall over Mexico, threatens Southwest U.S. with rain, flooding. See its path.
• The Weather Channel: Hurricane Polo’s moisture will trigger flooding in Southwest
• Yale Climate Connections: Blog: Hurricane Nolo takes another turn, Polo to bring deep tropical moisture to Southwest desert
• The Land Desk: Blog: Baseball in a national park?!? More flood warnings; Grid news.