Alert archive / Florida / Red Flag Warnings in 2026

Red Flag Warning 10, NWS Jacksonville, FL

April 20, 202611 counties in Florida

NWS Jacksonville, FL issued this red flag warning at Apr 20, 2026, 2:53 PM EDT for 11 counties in Florida. It took effect at Apr 21, 2026, 11:00 AM EDT. It was in force for 9 hr. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Apr 20, 2026, 2:53 PM EDT (18:53 UTC)
In effect from: Apr 21, 2026, 11:00 AM EDT
Expired: Apr 21, 2026, 8:00 PM EDT
In force: 9 hr
Issued by: NWS Jacksonville, FL

Counties Alachua County, FL, Baker County, FL, Bradford County, FL, Clay County, FL, Columbia County, FL, Duval County, FL, Gilchrist County, FL, Marion County, FL, Nassau County, FL, Putnam County, FL, Union County, FL

The radar

The Jacksonville radar (KJAX), 72 km from the middle of the area, began a volume at 18:55 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Apr 21, 11:28 AM EDT	WILDFIRE	1 Nne Bostwick, FL	Florida Forest Service (FFS) has combined the Crews Road and Railroad wildfires and will now be referred to as the Railroad Complex wildfire which is now at 4112 acres with 50 percent containment.
Apr 21, 5:40 PM EDT	WILDFIRE	4 Sw Sampson, FL	Wildfire reported by Bradford EM of about 170 acre off of County Road 18. Evacuation orders are in place for unknown number of homes in the area. Some area roads are shut down.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 12:00Z, 6.9 hours before the alert went out and 253 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1016 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 81 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this red flag warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Jacksonville, FL wrote its last area forecast discussion before this red flag warning went out at Apr 20, 2:28 PM EDT, 25 minutes earlier.

Area forecast discussion, Apr 20, 2:28 PM EDT, 25 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

The office that day

Everything else NWS Jacksonville, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 20, 12:38 AM EDT	Fire Weather Watch	JAX	Alachua, Baker, Bradford, Clay, Duval, Marion and 2 more	14 hr
Apr 20, 12:38 AM EDT	Red Flag Warning	JAX	Alachua, Baker, Bradford, Clay, Columbia, Duval and 7 more	19 hr

Nearby

Red Flag Warnings in Florida, 2026 Every red flag warning in 2026

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.