US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
435 PM EDT Wed Jun 26 2019
 
Valid Saturday June 29 2019 - Wednesday July 03 2019
 
Hazards:
- Heavy rain across portions of the Lower Mississippi Valley and the Southern Plains, Tue-Wed, Jul 
2-Jul 3.
- Flooding possible across portions of the Central Plains and the Middle Mississippi Valley.
- Flooding occurring or imminent across portions of the Central/Southern Plains, the Middle/Lower 
Mississippi Valley, and the Ohio Valley.
- Flooding likely across portions of the Central Plains and the Middle Mississippi Valley.
- Excessive heat across portions of the Central Plains, the Upper Mississippi Valley, and the 
Northern Plains, Sat-Sun, Jun 29-Jun 30.
- Excessive heat across portions of the Southeast and the Mid-Atlantic, Mon-Wed, Jul 1-Jul 3.
- Enhanced wildfire risk across portions of the mainland Alaska, Sat-Wed, Jun 29-Jul 3.
- Excessive heat across portions of mainland Alaska, Sat-Sun, Jun 29-Jun 30.
 
Detailed Summary:

Upper-level ridging over the Northern Plains and Upper Mississippi Valley will work in combination 
with low pressure over the Northern High Plains to pull dewpoint temperatures in the mid to upper 
70's and high temperatures ranging from the low 90's and upper 80's that will translate into heat 
index of 105 to 110 over parts of the Northern Plains into parts of the Upper Mississippi Valley on 
Saturday.  On Sunday the heat index will lower slightly to 100 to 105 which meets or exceeds the 
excessive heat criteria on Saturday and Sunday over parts of the Northern Plains and Upper 
Mississippi Valley.  Similarly, upper-level ridging and surface high temperatures ranging from the 
upper 90's to the low 100's combined with dewpoint temperatures in the mid to upper 60's into the 
low 70's, a long with dry soil will aid in producing heat index ranging from 105 to 110 over the 
Southeast that will meet or exceeds the excessive heat criteria for the Southeast from Monday into 
Wednesday. 

Meanwhile, surface high pressure over the Eastern Gulf of Mexico will aid in streaming moisture 
northward out of the Western Gulf of Mexico that will become tropical moisture overnight Tuesday 
into Wednesday a long with upper-level energy over the Lower Rio Grande Valley will aid in 
producing heavy rain over parts of the Western Gulf Coast on Tuesday into Wednesday.  

Over Alaska, temperatures of 20 degrees above normal and dry soil will aid in producing an area of 
excessive heat over parts of the Kenal Peninsula into parts of the Alaska Range on Saturday into 
early Sunday.  In addition, dry soil and dry vegetation/fuels a long with upper-level ridging over 
the Alaska mainland will combine to produce a broad area of Elevated Fire Weather risk over the 
Alaska mainland south of the Brooks Range eastward to the U. S./Canadian border and as far south as 
the Kuskokwim Mountains to parts of the Cook Inlet and Kenal Peninsula from Sunday into Wednesday.  

Ziegenfelder