Weekly Weather Watch: Tuesday, April 21st, 2026
We’re watching a high-stakes transition. Critical fire weather hits the High Plains Wednesday with dry air and gusts, while the Sierra Nevada takes 2+ feet of snow. As ENSO-neutral conditions lean toward El Niño, the jet stream is finally pushing moisture back into the central corridor.
An active spring pattern is setting up across the U.S. this week, bringing a mix of heavy mountain snow in the West, fire weather concerns in the Plains and Florida, and increasing thunderstorm activity from Texas to the Midwest and East. Conditions will shift quickly, with cooler air spreading east and multiple rounds of rain and storms developing into the weekend. Across Canada, heavy winter precipitation will fall on the central provinces, Saskatchewan to see the heaviest snowfall.
BRAND NEW PRODUCT☀️📊
Know What's Coming — For Your Exact Location
Most seasonal outlooks give you a broad regional brushstroke. The Makens Weather Seasonal Forecast App gives you a point forecast for your location — temperature and precipitation outlooks for the next six months, updated every morning.
Here's what you get as a member:
Your address, not a region: Enter your location once. Every month, the latest consensus forecast is waiting for you.
Weeks 1–4 near-term: Refreshes daily, so short-range planning and seasonal planning live in the same place.
Not just the mean: Charts show the full model spread so you can see how confident the ensemble is, not just which direction it's leaning.
Probability metrics: Know whether 60% or 90% of simulations favor above-normal temperatures. Confidence matters as much as the forecast itself.
If you're making decisions that depend on what the next few months look like — planting windows, input purchases, grazing plans, contract timing — this is the tool that bridges the gap between "what's the general trend" and "what should I actually expect at my operation."
📈 The latest weekly and monthly outlooks 👉 Join Now to Access
HEADLINERS:
Next 7 Days: Key Timing and Impacts
Tuesday (Apr 21):
Heavy rain develops across northern and central California, with localized flooding possible
Significant mountain snow (1–2+ feet) in the Sierra Nevada
Thunderstorms with heavy downpours across eastern Texas (isolated flooding risk)
Elevated fire danger in parts of west-central Florida
Wednesday (Apr 22):
Snow spreads into the northern Rockies with accumulating totals at higher elevations
Strong winds and very dry air create critical fire weather conditions across the High Plains
Showers expand into the Pacific Northwest and Great Basin
Thursday (Apr 23):
Cooler air pushes into the Interior West and begins reaching the northern Plains
Fire risk gradually eases but remains a concern in dry areas
Heavy precipitation spreads from the Rockies through Alberta to Saskatchewan into Manitoba
Friday – Weekend (Apr 24–26):
Storm system shifts into the Plains and Midwest, bringing widespread showers and thunderstorms
Increasing risk for strong to severe storms from the Mid-Mississippi Valley into the Ohio and Tennessee Valleys
Locally heavy rainfall may lead to isolated flooding concerns
Heavy snowfall remains over Saskatchewan into Manitoba
Late Weekend – Monday (Apr 26–28):
Front slows across the Southeast, keeping rain and storms active
Continued unsettled weather in the West with rain and mountain snow
Much cooler temperatures settle into the northern Plains and Rockies (well below average)
IN THE GAUGES, PRECIPITATION THROUGH THE 28TH:
Note: these projected totals are likely to be overdone in many areas because thunderstorms will be the primary source of rainfall, and we know they may be spread apart, especially over Oklahoma and Texas. So, these types of projections for thunderstorm areas reflect a potential rainfall total if you get the storms to pass over you. The actual observations will be more isolated totals of these magnitudes.
GRAB A RULER, SNOWFALL THROUGH THE 28TH:
RECORDS MADE TO BE BROKEN, DAILY HIGHS (RED) | DAILY LOWS (BLUE):
Interesting that Missoula, MT may hit a record high today, then turn around and set a record low in a few days.
UN-DROUGHTABLY DRY:
Dryness has continued in the Southeast, portions of the South, the Northeast, and much of the High Plains. The greatest precipitation occurred in the Great Basin, northern California, central and west Texas, northeast Kansas, and across much of Michigan and Wisconsin, where spring thunderstorms developed within an active weather pattern, mainly over the Midwest. - https://droughtmonitor.unl.edu/"
ARE YOU CIRRUS?!
Today in weather history:
1967 Tornadoes hit Illinois. An F4 occurring at 3:50 pm left 24 dead and 500 injured. Seven people were killed at a shopping center, and at least 13 were killed at Belvidere High School. Another F4 at 5:24 pm, left 33 dead and 500 injured. This funnel hit Palos Hills, Oak Lawn, Hometown, and Evergreen Park on the southwest side of Chicago.
The weather pattern is about to make a pretty sharp turn across the country. California starts the week with unusual October heat, including highs well into the 90s and even lower 100s in the Central Valley. Meanwhile, much cooler fall air has reached the Great Lakes and Northeast. The Gulf Coast and Southeast stay unsettled, and there’s that record to watch: a tropical depression is likely to develop over the Gulf this week and could strengthen as it moves northeast. If it becomes a hurricane after the 8th, 2026 will have the latest-first hurricane in the Atlantic Basin record.