{ "number": 917, "headline": "April 12, 2026 Sunday Spring Weather", "standfirst": "Very warm week ahead across Eastern U.S. with widespread 80s and 90s", "desk": "notebook", "dateline": { "place": "Weather Trader", "state": null, "lat": null, "lon": null, "site_key": null, "site_name": null, "site_url": null, "accent": null }, "edition": "2026-04-12", "published": "2026-04-12T23:33:51.432000Z", "updated": null, "access": "free", "body_html": "
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This is post number 917: Good Evening! Day 102 of 2026.

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

Weather Trader is an entirely reader-supported publication. Thank you to paid subscribers who support this newsletter and development behind the scenes. ALL content is generated by Ryan (not A.I.) including the maps.

Congratulations to Rory McIlroy on his back-to-back Masters championship! If you watched the tournament over the past several days, then you saw the absolutely perfect weather conditions \u2014 and the course was stunning. This is the best of Georgia in April. It was in the mid-80s in Augusta this afternoon with a slight breeze.

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RTMA Current Temperature Analysis | 6:30 PM ET

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Lower 48 average was 67.1\u00b0F with 194 million at least 70\u00b0F

RTMA Current Temperature Anomaly Analysis | 6:30 PM ET

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Lower 48 was 7.0\u00b0F ABOVE normal

Tropical Update: North Western Pacific

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Massive Super Typhoon Sinkalu (04W) has peaked at 155-170 knots \u2026 earlier at 09:40 UTC on Sunday with Automated Dvorak T number of 8.0.

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The T=8.0 (raw/snapshot) corresponded to Eye temperature of +23\u00b0C and convective canopy temperature of -83.1\u00b0 \u2014> certainly an upper-echelon / very extreme example of tropical cyclone on Earth in recent decades. 

2026APR12 094000  7.5  896.4 155.0  7.5 7.6 8.0  1.3T/6hr  OFF  OFF  OFF  OFF  23.00 -83.09  EYE
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JTWC official forecast for Sinlaku has curved northward away from Guam and now over Tinian on Wednesday.

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HAFS 12z Precipitable Water (my favorite parameter) through 5-days shows Sinlaku turning northward in the next 2-3 days and weakening as it encounters dryer air, cooler SSTs, and upper-level westerlies \u2014> extratropical transition process.

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HAFS-A (12z mesoscale hurricane model) for Sinlaku (04W) shows a \u201cbehemoth\u201d developing rapidly and moving over Tinian.

Sinlaku will grow even larger in size as the storm completes eyewall replacement cycles. The breadth of the 850 mb Wind Field is in the upper-echelon of global tropical cyclones.

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North Atlantic African Dust | Next 10-days

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Dust over the north Atlantic and Africa \u2014 as any early season tropical waves will be wiped out by dust. We\u2019ll also get a sense of the activity into June by the circulation pattern in the Eastern MDR of the Atlantic, and how dust flows over the ocean.

Lower 48 Weather into Monday Morning

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Western U.S. unsettled with rain/snow \u2026 SE Texas thunderstorms into evening

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

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Enhanced Risk of Severe Weather in upper-Midwest (Minnesota/Wisconsin) late Monday into early Tuesday.

HRRR 18z Precipitable Water Next 48-hours (my favorite parameter)

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Weather on Monday: warm frontal boundary across MN/WI into Great Lakes could see some large supercells with hail threat later on Monday \u2014 including Minneapolis.

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NDFD NWS Total Precipitation Next 72-hours through Wednesday Afternoon

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NWS Snowfall Next 72-hours \u2014 through Wednesday Afternoon

ECMWF 12z | Forecast 6-days of Precipitable Water (my favorite parameter)

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Moisture streams in multiple surges out of the Gulf of Mexico \u2014> open for business!

ECMWF 12z Precipitation Type + Intensity | Next 8-days

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Western U.S. Storm System into California

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Atlantic Basin | Next 8-days

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Atlantic Basin Precipitable Water next 8-days

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Moisture Transport (IVT) next 10-days

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Precipitation Surplus centered on Caribbean including Puerto Rico!

Total Precipitation Next 10-days | Blend of Models

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Ring of fire pattern with zip/zero rainfall across the Southeast.

Blend of Models | Total Snowfall Next 10-Days

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ECMWF AIFS 12z next 10-days of 500 mb Height Anomaly

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The Hudson Bay Polar Vortex continues to spin. Eastern ridge breaks down by next weekend

Blend of Models Temperatures | Highs through Tuesday, April 21

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Blend of Models Temperatures | Lows through Tuesday, April 21

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Low Temperatures Monday

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Only 1.75 million below freezing

High Temperatures on Monday

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80s for 171 million population from central Plains into Mid-Atlantic \u2026 but almost no 90\u00b0F yet

High Temperatures on Tuesday

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204 million at least 80\u00b0F and we add 7 million at least 90\u00b0F \u2014> western U.S. cool!

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ECMWF AIFS 12z | Temperature at 500 mb | Next 10-days

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There\u2019s STILL a -45\u00b0C contour of the polar vortex at 500 mb holding on for dear life in Canada for the next 7-10 days, and drifts toward Greenland. Bizarre!

Snowfall from ECMWF HRES (15-days)

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Snowfall from ECMWF AIFS-Single (12z) next 15-days

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

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Week #1 | Temperature Anomaly | April 12 - April 18

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Week #2 | Temperature Anomaly | April 19 - April 25

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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. NOAA WPC and SPC for fronts/convective outlooks.

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Congratulations to Rory McIlroy on his back-to-back Masters championship! If you watched the tournament over the past several days, then you saw the absolutely perfect weather conditions \u2014 and the course was stunning. This is the best of Georgia in April. It was in the mid-80s in Augusta this afternoon with a slight breeze.

RTMA Current Temperature Analysis | 6:30 PM ET

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