Trending Cooler

General Overview: ACTIVE WEATHER PATTERN ACROSS THE NATION WITH RAIN AND THUNDERSTORMS AFFECTING THE EASTERN SEABOARD AND GULF COAST INITIALLY, THEN SHIFTING TO THE GREAT LAKES AND UPPER MIDWEST. MIXED PRECIPITATION EXPECTED ACROSS THE NORTHERN ROCKIES AND PACIFIC NORTHWEST. THUNDERSTORM DEVELOPMENT LIKELY ACROSS THE SOUTHWEST AND SOUTHERN PLAINS BY MIDWEEK. TEMPERATURES WILL START ABOVE NORMAL IN THE NORTHEAST BEFORE COOLING, WHILE THE SOUTHWEST AND TEXAS REMAIN WARMER THAN AVERAGE.

EAST:  
A frontal boundary will bring rain and thunderstorms to much of the Eastern Seaboard on Monday, with precipitation extending from the Northeast through the Mid-Atlantic and into Florida. High pressure will briefly build in by Tuesday, bringing drier conditions before another low pressure system approaches from the Great Lakes region by midweek. This system will bring additional rainfall to the Northeast and parts of the Mid-Atlantic. The Southeast will experience scattered thunderstorm activity early in the period, particularly across Florida, before drier conditions prevail later in the week as high pressure builds in from the Atlantic.

Temperature Anomalies:

-Days 1-3: Significantly above normal temperatures across the Northeast and Great Lakes, with anomalies of 6-12°F above average, particularly in New York and surrounding areas. Near normal temperatures for the Southeast.

-Days 4-6: Cooling trend with temperatures falling to near or slightly below normal across much of the region. Some below normal readings developing in the Ohio Valley and parts of the Southeast, with continued mild conditions in New England.

-Days 7-10: Generally near normal temperatures returning to most of the East, with slightly above normal readings developing in the Ohio Valley and Mid-Atlantic by the end of the period.

CENTRAL:  
Today and Tuesday, low pressure will develop over the Northern Plains and move eastward, bringing rain to the Great Lakes region and Upper Midwest. Mixed precipitation is possible across portions of Minnesota and the Dakotas as colder air filters in. By midweek, thunderstorm activity will develop across the Southern Plains and Gulf Coast as a new frontal system pushes through. High pressure will dominate the Central Plains for much of the period, providing generally dry conditions there.

Temperature Anomalies:

-Days 1-3: Near normal temperatures for most of the region, with slightly above normal readings in Texas and slightly below normal temperatures developing in parts of the Northern Plains.

-Days 4-6: Below normal temperatures spreading across the Mid-Mississippi Valley and Ohio Valley, with readings 3-6°F below average. Above normal temperatures persisting across Texas and the Southern Plains.

-Days 7-10: Warming trend developing across the entire Central region, with above normal temperatures spreading northward from Texas through the Plains states. Northern Plains and Upper Midwest could see temperatures 6-10°F above normal by the end of the period.

WEST:  
High pressure will dominate the Southwest early in the period, while a series of systems bring mixed precipitation to the Pacific Northwest and Northern Rockies. Rain and mountain snow will affect parts of Washington, Oregon, Idaho, and Montana through the first half of the week. By midweek, a low pressure system will develop over the Southwest, bringing thunderstorm activity to Arizona and New Mexico, while another system approaches the Pacific Northwest. The pattern remains active across the northern tier, with periods of precipitation likely throughout the forecast period.

Temperature Anomalies:

-Days 1-3: Near to slightly below normal temperatures across the Pacific Northwest and Northern Rockies, with slightly above normal readings in the Southwest and Southern California.

-Days 4-6: Warming trend for the Pacific Northwest and Northern Rockies, with above normal temperatures developing. Southwest remains warmer than average, particularly across Arizona and western Texas.

-Days 7-10: Below normal temperatures developing across the Pacific Northwest and Great Basin, with readings 3-6°F below average. Continued above normal temperatures across the Desert Southwest and Southern Rockies.

TROPICAL:
ATLANTIC: Invest 98L is located near 12.7N 62.9W. This disturbance has a high potential (70%) of developing in the Caribbean Sea this week. Any resulting system will likely impact Jamaica, Cuba, and the Greater Antilles into the end of the week.

EAST PACIFIC: A disturbance moving westward further into the Pacific is currently located well offshore Guatemala. Gradual development is expected over the next 5 days, but this system will remain well offshore and produce no land impacts.