Some housing markets are heating up so much that homes are selling in less than 24 hours—also known as a “flash sale.” 

Real estate brokerage Redfin recently analyzed MLS and additional housing data between Oct. 1, 2012 and Feb. 26, 2013, to reveal which metros are seeing some of the fastest sales. Redfin based its rankings on cities that were seeing a home status going from active to pending in less than a day after being listed. 

Redfin revealed the following cities are seeing the most flash sales:

1. Phoenix: 540
2. Chicago: 261
3. Houston: 188
4. Dallas: 184
5. Austin: 163
6. San Diego: 135
7. Los Angeles: 132
8. Sacramento, Calif.: 128
9. Denver: 115
10. Portland, Ore.: 115
11. Las Vegas: 100
12. Baltimore, Md.: 97
13. Washington, D.C.: 87
14. Seattle: 87
15. San Jose, Calif.: 74 

Source: RedFin