Alert archive / Arkansas / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 187, NWS Memphis, TN

April 20, 2025Clay County, Greene County, Arkansas

NWS Memphis, TN issued this severe thunderstorm warning at Apr 20, 2025, 8:23 PM CDT for Clay County, Greene County, Arkansas. It was in force for 52 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 20, 2025, 8:23 PM CDT (01:23 UTC)
Expired: Apr 20, 2025, 9:15 PM CDT
In force: 52 min
Issued by: NWS Memphis, TN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Clay County, AR, Greene County, AR

The radar

The Memphis radar (KNQA), 114 km from the middle of the area, began a volume at 01:23 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 20, 5:39 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Little Rock, AR (KLZK), launched 00:00Z, 1.4 hours before the alert went out and 164 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: 610 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 1183 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 301 m²/s²
0-3 km storm-relative helicity: 505 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 17.2

Open this sounding in Storm Lab

What forecasters said that day

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

NWS Memphis, TN wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 20, 7:07 PM CDT, 1 hour 16 minutes earlier.

Area forecast discussion, Apr 20, 7:07 PM CDT, 1 hour 16 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>

In the hours before

Special weather statement, Apr 20, 8:22 PM CDT, 1 minute before

Special Weather Statement
National Weather Service Memphis TN
822 PM CDT Sun Apr 20 2025

ARZ009-018-MOZ113-210145-
Greene AR-Clay AR-Dunklin MO-
822 PM CDT Sun Apr 20 2025

...A STRONG THUNDERSTORM WILL IMPACT NORTHWESTERN GREENE...WESTERN
CLAY AND NORTH CENTRAL DUNKLIN COUNTIES THROUGH 845 PM CDT...

At 822 PM CDT, Doppler radar was tracking a strong thunderstorm near
Biggers, or 8 miles east of Pocahontas, moving northeast at 50 mph.

HAZARD...Wind gusts up to 50 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Knobel, McDougal, Heelstring, Wilhelmina, Delaplaine, Chalk Bluff
Natural Area, Tipperary, Hickoria, Success, Case, Brookings, Chalk
Bluff Battlefield Park, Pollard, Twin Oaks, Palatka, Peach Orchard,
Datto, Corning, O'Kean, and Reyno.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Tornado Watch remains in effect until midnight CDT for eastern
Arkansas...and southeastern Missouri.

&&

LAT...LON 3651 9008 3617 9081 3629 9081 3630 9079
      3628 9078 3628 9075 3641 9075 3641 9077
      3642 9076 3643 9078 3649 9077 3650 9078
      3650 9022 3654 9021 3655 9019 3659 9018
TIME...MOT...LOC 0122Z 236DEG 45KT 3628 9083

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 MPH

KRM

The office that day

Everything else NWS Memphis, TN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 20, 11:22 PM CDT	Tornado Warning	MEG	Lake, Obion	38 min
Apr 21, 12:58 AM CDT	Areal Flood Advisory	MEG	Shelby	2 hr
Apr 20, 8:22 PM CDT	Special Weather Statement	MEG	Clay	23 min
Apr 20, 9:11 PM CDT	Severe Thunderstorm Warning	MEG	Clay	49 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2025 Every severe thunderstorm warning in 2025

Sources

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