Flood Warning Issued for Caledonia County, VT as Ice Jam Triggers Evacuations in St. Johnsbury

Source: NOAA · Northeast Vermont

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A Flood Warning is in effect for Caledonia County, Vermont, until 7:00 PM EDT Thursday as an ice jam causes immediate flooding and evacuations in St. Johnsbury.

What this NWS weather alert tells you, and what most readers miss

This notice was issued by NOAA on March 24, 2026 and geographically references Northeast Vermont. Its severity classification of "high" signals how the issuing agency weighs the risk of harm if no action is taken — "critical" and "high" tier alerts typically carry direct consumer actions, while "medium" and "low" tend toward informational guidance or monitoring advisories. The category it belongs to — Weather Alerts — determines the regulatory framework behind it, which shapes what remedies (refunds, replacements, recalls, evacuations) are available to affected individuals and who holds statutory responsibility for enforcement.

Most readers skim a notice like this, check whether they are personally affected, and move on. The more useful lens is to read it as a data point about the issuing system: how quickly NOAA detected the hazard, how precise the geographic or product-identifier scope is, and whether similar notices have clustered in the same category or region in the last 90 days. Cluster patterns frequently precede a broader regulatory action — a single localized NWS weather alert is isolated; three of them within a quarter often indicate a supply-chain, infrastructure, or seasonal driver that will keep producing notices until something structural changes.

For decision-making, Areazine pairs each alert with the original agency URL, the full agency name, and a timestamp so you can verify the notice against the primary source before acting on it. Tags on this item (weather, alert, Flood Warning, Caledonia) map to related alerts in the same area of risk — browsing them together gives a clearer picture than any single notice alone, because the shape of an ongoing issue only becomes visible across multiple sequential alerts.

Alert Details

The National Weather Service in Burlington, VT has issued a Flood Warning for Caledonia County in northeast Vermont. The alert is effective immediately and remains in place until 7:00 PM EDT on Thursday, March 12.

Affected Areas

The warning specifically impacts Caledonia County. Emergency Management has reported significant flooding in St. Johnsbury, particularly near the intersection of the Passumpsic and Moose Rivers. Evacuations are currently underway for residents on Elm Street and Concord Avenue.

What You Should Do

Residents in the affected area should avoid flooded roads and low-lying locations. The National Weather Service advises: "Turn around, don't drown when encountering flooded roads," as most flood-related fatalities occur in vehicles. If you are in a flood-prone area or near the identified ice jam, remain vigilant for sudden water rises.

Expected Conditions

Flooding is being caused by an ice jam at the confluence of the Passumpsic and Moose Rivers. While approximately 0.25 to 0.5 inches of rain have already fallen, no additional rainfall is expected. However, the primary hazard remains the ice jam; any sudden release of the ice could result in a rapid rise in water levels, leading to flash flooding in rivers, creeks, and streams.

Timeline

The Flood Warning is scheduled to expire at 7:00 PM EDT this evening. Flooding impacts are expected to continue until the ice jam stabilizes or clears.

Original source: NOAA Official Notice ↗

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Frequently Asked Questions

Common questions about this NWS weather alert.

What is this NWS weather alert about?
A Flood Warning is in effect for Caledonia County, Vermont, until 7:00 PM EDT Thursday as an ice jam causes immediate flooding and evacuations in St. Johnsbury.
Which agency issued this alert?
This alert was issued by NOAA. The original notice is available at the source link at the bottom of this article.
How severe is this alert?
This alert is classified as "high" severity. Take precautions and monitor for updates.
What area is affected?
This alert affects Northeast Vermont. Check with NOAA for the most current geographic scope.
Where can I find more Weather Alerts updates?
Browse the full Weather Alerts feed on Areazine at areazine.com/weather/ for the latest updates from NOAA and other agencies.