Investigate the impacts of assimilating satellite rainfall estimates on rainstorm forecast over southwest United States
Article first published online: 18 AUG 2004
Copyright 2004 by the American Geophysical Union.
Geophysical Research Letters
Volume 31, Issue 16, August 2004
How to Cite
2004), Investigate the impacts of assimilating satellite rainfall estimates on rainstorm forecast over southwest United States, Geophys. Res. Lett., 31, L16104, doi:10.1029/2004GL020120., , , and (
- Issue published online: 18 AUG 2004
- Article first published online: 18 AUG 2004
- Manuscript Accepted: 20 JUL 2004
- Manuscript Revised: 8 JUN 2004
- Manuscript Received: 30 MAR 2004
 Using the MM5-4DVAR system, a monsoon rainstorm case over southern Arizona (5–6 August 2002) was investigated for the influence of assimilating satellite rainfall estimates on precipitation forecasts. A set of numerical experiments was conducted with multiple configurations including using 20-km or 30-km grid distances and none or 3-h or 6-h assimilation time windows. Results show that satellite rainfall assimilation can improve the rainstorm-forecasting pattern and amount to some extent. The minimization procedure of 4DVAR is sensitive to model spatial resolution and the assimilation time window. The 3-h assimilation window with hourly rainfall data works well for the 6-h forecast, and for 12-h or longer forecasts, a 6-h assimilation window will be requested.