US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
304 PM EST Wed Mar 10 2021
 
Valid Saturday March 13 2021 - Wednesday March 17 2021
 
Hazards:
- Heavy precipitation across portions of the Central Plains and the Middle/Upper Mississippi 
Valley, Sat-Sun, Mar 13-Mar 14.
- Heavy rain across portions of the Central/Southern Plains, the Middle/Lower Mississippi Valley 
and the Ohio Valley, Sat-Sun, Mar 13-Mar 14.
- Heavy rain across portions of the Lower Mississippi Valley, the Central/Southern Appalachians, 
the Tennessee/Ohio Valley and the Southeast, Mon-Tue, Mar 15-Mar 16.
- Heavy snow across portions of the Central Rockies, the Central/Northern Plains and the Middle 
Mississippi Valley, Sat-Sun, Mar 13-Mar 14.
- Severe weather across portions of the Central/Southern Plains, Sat, Mar 13.
- Severe weather across portions of the Central/Southern Plains and the Middle/Lower Mississippi 
Valley, Sun, Mar 14.
- Flooding possible across portions of the Middle Mississippi Valley, the Great Lakes, the Ohio 
Valley, and the Upper Mississippi Valley.
- Flooding occurring or imminent across portions of the Ohio Valley and the Tennessee Valley.
- Flooding likely across portions of the Middle Mississippi Valley.
- High winds across portions of Coastal Alaska, Sat, Mar 13.
 
Detailed Summary:

The main area of concern during the medium range period (Saturday, March 13th - Wednesday, March 
17th) will be across the central CONUS, where an upper-level low and quasi-stationary front are 
forecast to generate multiple sensible weather hazards. A winter storm is likely to begin over the 
Central Rockies late on Friday as the low-level wave develops on the lee-side of the Rockies. A 
well defined mid-latitude cyclone will form on Saturday and go on to produce strong winds and 
several inches of snow across the I-25 corridor from the Denver area up through southeastern 
Wyoming. Blowing snow will likely be an issue for this area. This heavy snow threat will continue 
into parts of Nebraska and South Dakota on Sunday as the system progresses eastward. Heavy 
precipitation is expected for northwestern Kansas into southeastern Nebraska and Iowa where rain 
early on will likely changeover to snow as cold air pours in on the backside of the system. 
Meanwhile, heavy rain and severe weather are expected over much of the Central/Southern Plains and 
Middle/Lower Mississippi Valley this weekend. Heavy rain may spread into the Tennessee Valley and 
Southern Appalachians by Monday, but confidence on this isn't particularly high. Another, less 
potent system will follow in behind the previous one and bring additional rainfall to the Southeast 
and Southern Appalachians leading to the potential for heavy rain on Tuesday.

Alaska will experience high winds along much of its west coast on Saturday as a potent area of low 
pressure tracks along Russia's Bering coast toward St. Lawrence Island. The main hazard associated 
with this will be the potential for blowing snow along coastal areas. Moderate rain and snow will 
impact the southern coast and the panhandle through the beginning of the week, although model 
confidence isn't high enough at the moment for a hazard area. This is subject to change in the 
coming days.

Kebede