US Day 3-7 Hazards Outlook
NWS Weather Prediction Center College Park MD
329 PM EDT Tue Jul 07 2020
 
Valid Friday July 10 2020 - Tuesday July 14 2020
 
Hazards:
- Heavy rain across portions of northern New Jersey into southern New England, Fri-Sat, Jul 10-Jul 
11.
- Flooding possible across portions of Minnesota and North Dakota.
- Flooding occurring or imminent across portions of South Dakota.
- Excessive heat across portions of southern California into southwestern Arizona, Sat-Mon, Jul 
11-Jul 13.
- Excessive heat across portions of the the southern Plains into the lower Mississippi Valley, 
Fri-Tue, Jul 10-Jul 14.
- Much above normal temperatures across portions of the southern High Plains, Sat-Tue, Jul 11-Jul 
14.
- Much above normal temperatures across portions of the lower Great Lakes into northern New 
England, Fri, Jul 10.
 
Detailed Summary:

A slowly evolving summer weather pattern is expected to continue into the medium range period (Fri 
7/10 - Tue 7/14) across the U.S.  Much of the western U.S. will remain dry with temperatures not 
straying too far from average for mid-summer. This means that high temperatures will soar well into 
the 110s for the lower elevations of the Desert Southwest while highs only in the 60s are forecast 
along the coast of the Pacific Northwest.  An area of Excessive Heat is highlighted for portions of 
southern California into southwestern Arizona where afternoon temperatures are forecast to reach 
115 degree or above, even though the heat indices could be slightly lower due to prevailing dry 
conditions.  Over the southern High Plains, however, a building ridge of high pressure aloft will 
allow afternoon temperatures to reach the century mark, and possibly approach 110 degrees at the 
hottest locations by early next week.  Thankfully, the humidity there should be relatively low to 
keep it from feeling too oppressive.  But the dry conditions could promote the danger of wild 
fires.  In contrast, moist air from the Gulf will make the heat feel very oppressive over the 
Aka-La-Tex region of the southern Plains to the lower Mississippi Valley and just inland from the 
Texas coast.  An area of Excessive Heat is indicated even though the actual high temperatures will 
be less than 10 degrees above normal.

Over the Northeast, heat will extend into the medium-range from the lower Great Lakes to northern 
New England before cooler and drier air slowly filters in from Canada by early next week.  
Meanwhile, a low pressure system is forecast to track up the East Coast and should bring a threat 
of heavy rain from portions of northern New Jersey into southern New England Friday into Saturday 
morning.  The National Hurricane Center is also monitoring this area of low pressure for any 
potential for tropical cyclone formation during the medium-range period.  There is also an 
increasing chance of showers and thunderstorms along the Eastern Seaboard by early next week as a 
front approaches from the west.  No areas of heavy rain are indicated at this time.  Farther west, 
a low pressure wave could deliver some enhanced rainfall across the mid-Mississippi Valley Saturday 
night and Sunday.  Over the northern Plains, chance of thunderstorms should increase as a cold 
front moves across early next week. 

Alaska should remain hazards-free as the state is wedged between the northern stream across the 
Arctic Ocean and the southern stream across the northeast Pacific.  Scattered showers and high 
elevation wet snow are expected to linger across much of southern Alaska through the medium range 
period, and should remain well below heavy rain criteria.

Kong