Colorado, Nebraska, Kansas, Iowa and Illinois Brace for Powerful Late-March Heat Dome as 15–20°C Anomalies Spread Across the Central United States
UNITED STATES — Forecast data valid Thursday, March 26 (12z) shows a powerful surge of anomalous warmth expanding across the Great Plains and Midwest, with some of the strongest temperature departures centered over Colorado, Nebraska, Kansas, Iowa and Illinois.
The 850 mb temperature anomaly map indicates widespread +10°C to +20°C departures above average across the central United States — a signal of an unusually strong warm air mass for late March.
Core of the Heat Centered Over the Central Plains
The most intense anomaly shading — deep reds and maroons — is focused across:
- Eastern Colorado
- Western and central Nebraska
- Kansas
- Extending into Iowa and northern Missouri
This corridor represents the heart of the warm anomaly, where air temperatures roughly 4,000–5,000 feet above the surface are forecast to run dramatically above seasonal norms.
Such upper-level warmth strongly supports well-above-average surface temperatures.
Midwest Also Under Strong Warm Signal
The anomaly field expands eastward into:
- Illinois
- Indiana
- Ohio
- Southern portions of Michigan
While slightly weaker than the core Plains signal, these regions still fall within a broad zone of above-normal air mass temperatures.
Sharp Gradient to the North
In contrast, cooler anomalies appear across:
- Montana
- North Dakota
- Parts of southern Canada
This sharp north-to-south gradient underscores the strength of the upper-level ridge building over the central U.S.
Why the 850 mb Map Matters
The 850 mb level provides a clear view of the air mass characteristics feeding surface temperatures. When anomalies reach +15°C or greater at this level in late March, it often translates to:
- Rapid afternoon warming
- Widespread highs far above climatological averages
- Increased potential for record-challenging temperatures in some locations
The concentration of strong anomalies across multiple Plains and Midwest states signals a large-scale event rather than a localized warm-up.
March Continues Its Unusual Warm Trend
Repeated surges of above-normal temperatures throughout the month have positioned the United States on track for an exceptionally warm March.
This latest anomaly map reinforces that pattern, showing warmth dominating a large swath of the country from the Southern Plains into the Upper Midwest.
Bottom Line
Forecast data for March 26 shows a significant heat anomaly centered over Colorado, Nebraska, Kansas, Iowa and Illinois, with widespread +10°C to +20°C departures at 850 mb across the central United States.
The magnitude and coverage of the anomaly highlight another major late-March warm surge across the Great Plains and Midwest.
Stay with WaldronNews.com for continued updates as this heat episode unfolds.