{ "number": 937, "headline": "May 17, 2026 Sunday Spring Weather", "standfirst": "Heat wave continues across Mid-Atlantic with widespread 90s", "desk": "record", "dateline": { "place": "Weather Trader", "state": null, "lat": null, "lon": null, "site_key": null, "site_name": null, "site_url": null, "accent": null }, "edition": "2026-05-18", "published": "2026-05-18T01:38:06.946000Z", "updated": null, "access": "free", "body_html": "
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This is post number 937: Good Evening! Day 137 of 2026. 13 more days until start of Atlantic Hurricane Season.

Author: Dr. Ryan Maue (X @RyanWeather X @weathertrader)

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Severe storms rumbling across the central Plains this evening

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Temperature Anomaly Next 6-days \u2014 into Saturday

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Sunday Evening Headlines

Precipitation Next 10-days | Blend of Models (v5.0)

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Over next 10-days, upwards of 6-8\u201d of rain across eastern Texas \u2014 but also widespread 1\"-2\u201d or locally more in slow moving thunderstorms in the moist air mass

High Temperatures Next 9-days until Tuesday May 26th

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Very comfortable nationwide Wednesday into Thursday with cooler air behind strong cold front. Temperatures quickly heat up in the 80s and 90s by Memorial Day Weekend!

ECMWF 18z | Precipitation Type + MSLP | Next 6-days

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Notable weather systems:

Strong low pressure system with heavy snowfall ejects out of Wyoming Rockies quickly in the Great Lakes and then Canada

Next system dips out of the Northern Rockies toward weekend \u2014 but weaker

Plenty of moisture + pop-up storms across Texas and the Deep South.

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ECMWF Flagship Ensemble Temperature Outlook

Temperature Anomaly | Next 15-days | ECMWF EPS 12z Ensemble Mean

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Week #1 | Temperature Anomaly | May 17- May 23

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Week #2 | Temperature Anomaly | May 24 - May 30

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ECMWF HRES 18z | Forecast 6-days of Precipitable Water (my favorite parameter!)

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Integrated Vapor Transport | Next 10-days

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Gulf of Mexico opens for business by Sunday \u2014 and we get a more sustained southerly flow into Memorial Day weekend behind the Bermuda subtropical high

RTMA Current Temperature Analysis | 7:45 PM ET

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187 million at least 80\u00b0F earlier in the evening \u2014 but only 30s and 40s in Nevada

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RTMA Current Temperature Anomaly Analysis | 7:45 PM ET

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Lower 48 was -0.7\u00b0F BELOW normal with extreme chill across Nevada and into the northern Rockies

Lower 48 Weather This Evening into Monday Morning

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Enhanced Risk of Severe Weather continues as Thunderstorms move into Iowa and Missouri: Radar Simulation (HRRR) next 18-hours

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HRRR 18z \u2014 Radar Simulation Next 48-hours to Tuesday 2 PM ET

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Weather on Monday | Moderate Risk of Severe Weather in Kansas

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SPC: THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS FROM CENTRAL KANSAS TO SOUTHEAST NEBRASKA
Numerous severe thunderstorms are expected to develop Monday along a cold front and dryline extending from the Great Lakes into the central/southern Plains. Supercells capable of very large hail and strong to intense tornadoes are most likely from central Kansas into southeast Nebraska

Upper-Level Circulation Pattern

ECMWF AIFS-Single 18z | 500 mb Height Anomaly Next 10-days

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Heat dome / ridge breaks down briefly by Wed/Thurs across the Eastern U.S. but the process repeats with another very sharp trough digging into the west = heat across Eastern U.S. into late-May!

Low Temperatures Monday Morning

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Chilly across the Western U.S. with still enough area freezing for heavy snowfall

High Temperatures Monday

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85 million at least 90\u00b0F \u2026 and 263 million at least 80\u00b0F = more like summer

High Temperatures on Tuesday

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Mid-to-Upper 90s across the Mid-Atlantic including Washington D.C. and Philadelphia with 109 million population at least 90\u00b0F

High Temperatures on Wednesday

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Still well into the 90s along the entire I-95 corridor from Virginia into New England.

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NDFD NWS Total Precipitation Next 72-hours through Wednesday Afternoon

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7-Day Total Precipitation | Blend of Models | Through next Thursday

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Heavy Snowfall Across Utah, Wyoming, and Colorado with storm system

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15-day Ensemble Median Precipitation | ECMWF 12z

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Tropical Update

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Three tropical waves from Caribbean into the far tropical Atlantic

African dust plume forecast next 10-days

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North Atlantic Tropics | Quiet Next 7-days

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A significant upper-level trough is digging well into the tropics \u2026 very hostile environment regardless of the chilly ocean temperatures typical for mid-May.

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Precipitable water next 6-days = quiet with a surge of African / Saharan air coming across the MDR into next week

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Western Pacific: No tropical storm activity expected in the next 7-days

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Eastern Pacific Tropics | Quiet next 7-days

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While the EPAC season started on May 15th, and SSTs are very warm, waiting on tropical waves to hold together crossing Central America. Large area of 28\u00b0C+ water = plenty of fuel for major hurricanes already.

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Forecast from April 7, 2026: Atlantic Seasonal Hurricane Forecast: 11/5/2

9-13 Named Storms (11 most likely)
4-7 Hurricanes (5 or 6 most likely)
1-3 Major Hurricanes (2 most likely)

ACE: 75-85

Maps sourced from weathermodels.com designed and innovated by yours truly! Please subscribe there for real-time access to the newest maps, charts from all of the weather models including ECMWF and AIFS, and NOAA GFS/GEFS, HRRR/RRFS and Blend of Models (NBM). NOAA WPC and SPC for fronts/convective outlooks.

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Severe storms rumbling across the central Plains this evening

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