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May 13, 2025 Tuesday Weather

May 13, 2025 Tuesday Weather

Trending cooler across Rockies into Midwest next week

May 13, 2025
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Weather Trader
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May 13, 2025 Tuesday Weather
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Good morning!

Looking ahead into the weekend and early next week, ECMWF model showing a chilly situation in the Rockies with heavy snowfall likely behind a strong cold front with yet another trough in the Southwest U.S.

Total snowfall through 10-days is significant for the Rockies with highest elevations seeing 1-2 feet.

Moisture from the Plains will back westward into the mountains and be plenty cold enough for snowfall. Good question if Denver will see some snow.

Probability of 1-inch or more snowfall in next 10-days. I thought we were done with winter, but I guess not.

% chance of 1-inch or more EPS 00z

Upper Level (500 mb) Height Anomaly at +162H valid at Monday 18z (May 19)

The cold trough will dip temperatures in the Southwest 10-20°F below normal including Phoenix. Meanwhile, ridging downstream over Texas and the Southeast centered over the Gulf of Mexico will keep temperatures much higher than normal with humidity — more early summerish pattern.

However, the colder than 30°F below normal over Wyoming, South Dakota, and Nebraska should be enough for heavy snowfall and potential “Winter Storm” conditions. Still 5-6 days off, so the models could back off.

14°F to 16°F above normal on May 19 in Texas is good for 90s and 100s.

Atlantic Satellite Image

Dust is heavy off the African coast and you can see the clouds are almost obliterated. Way too dry and warm above the surface to allow convection = very stable.

Satellite Imagery This Morning Across Lower 48

Washout underway in the Mid-Atlantic with persistent showers but not severe.

Otherwise, clearing out finally as the long-lived trough is eroded by the warm May sunshine. More pop-up storms will be a threat this afternoon.

Current Radar: 11:08 AM ET

Soaking rain from coastal NC into Virginia through D.C. and now Pennsylvania.

Frontal Boundaries at 8 PM | Weather on Tuesday

Heaviest rain centered on Washington D.C. today.

High Temperatures Today | Tuesday May, 13 2025

75.2°F is the Lower 48 average high temperature with 251 million at least 70°F, less than yesterday. 7 million in Texas on the dot at least 100°F


Temperature Analysis | 10:30 AM ET

Eastern half of the Lower 48 is almost entirely in the 70s

Temperature Anomaly | 10:30 AM ET

Overall the Lower 48 is +3.4°F and above normal [1991-2020]. Chilly air into California and Nevada, well below normal. 20°F above in the Midwest and even warmer in Canada.


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