Alert archive / Arkansas / Flash Flood Warnings in 2018

Flash Flood Warning 33, NWS Little Rock, AR

February 28, 201811 counties in Arkansas

NWS Little Rock, AR issued this flash flood warning at Feb 28, 2018, 8:10 PM CST for 11 counties in Arkansas. It was in force for 12 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Feb 28, 2018, 8:10 PM CST (02:10 UTC)
Expired: Mar 1, 2018, 8:15 AM CST
In force: 12 hr
Issued by: NWS Little Rock, AR
Area: Storm-based polygon
Flood severity: None

Counties Clark County, AR, Dallas County, AR, Garland County, AR, Grant County, AR, Hot Spring County, AR, Jefferson County, AR, Lonoke County, AR, Montgomery County, AR, Pike County, AR, Pulaski County, AR, Saline County, AR

The radar

The Little Rock radar (KLZK), 68 km from the middle of the area, began a volume at 02:13 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 nearest sounding before it

Shreveport, LA (KBAD), launched 00:00Z, 2.2 hours before the alert went out and 232 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: 141 J/kg
Mixed-layer CIN: -71 J/kg
Mixed-layer LCL: 1361 m above ground
0-6 km bulk shear: 71 kt
0-1 km storm-relative helicity: 211 m²/s²
0-3 km storm-relative helicity: 297 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 5.5

Open this sounding in Storm Lab

What forecasters said that day

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

NWS Little Rock, AR wrote its last area forecast discussion before this flash flood warning went out at Feb 28, 5:44 PM CST, 2 hours 26 minutes earlier.

Area forecast discussion, Feb 28, 5:44 PM CST, 2 hours 26 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>

Hazardous weather outlook, Feb 28, 3:52 PM CST, 4 hours 18 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Little Rock AR
352 PM CST Wed Feb 28 2018

ARZ003>007-012>016-021>025-030>034-037>047-052>057-062>069-012200-
Boone-Marion-Baxter-Fulton-Sharp-Newton-Searcy-Stone-Izard-
Independence-Johnson-Pope-Van Buren-Cleburne-Jackson-Logan-Conway-
Faulkner-White-Woodruff-Scott-Yell-Perry-Polk-Montgomery-Garland-
Saline-Pulaski-Lonoke-Prairie-Monroe-Pike-Clark-Hot Spring-Grant-
Jefferson-Arkansas-Dallas-Cleveland-Lincoln-Desha-Ouachita-
Calhoun-Bradley-Drew-
352 PM CST Wed Feb 28 2018

This Hazardous Weather Outlook is for a Large Part of Arkansas.

.DAY ONE...This Evening and Tonight

Numerous showers and thunderstorms are expected through the night
as the next weather system and cold front move through the region.
Rain will be heaviest over central and southern Arkansas where
another two to more than four inches of rain could fall.

This additional rainfall will only aid in the worsening flood
conditions already in place from the most recent heavy rainfall
event across the area.

There will also be the possibility of isolated severe storms, with
hail and winds the main threats. An isolated tornado may also
develop. The main threat area will be over the southern half of
Arkansas late this afternoon and evening.

.DAYS TWO THROUGH SEVEN...Thursday Through Tuesday

Rain will end during the day Thursday. Dry weather is forecast the
rest of Thursday, Friday and Saturday. The chances of rain will be
back in the forecast Sunday with the next weather system to affect
the region.

Due to the recent prolonged period of heavy rainfall, river stages
are expected to remain high into next week. Flooding will continue
in several river basins, including the Black, White, Cache,
Ouachita, and Saline Rivers.

.Spotter Information Statement...

Spotter activation may be necessary late this afternoon and this
evening, given the possibility of severe weather.

&&

Visit NWS Little Rock on the web. Go to http://weather.gov/lzk.

In the hours before

Local storm report, Feb 28, 6:28 PM CST, 1 hour 42 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 Little Rock, AR issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 28, 8:35 PM CST	Flash Flood Warning	LZK	Arkansas, Jefferson, Lonoke, Monroe, Prairie	11 hr
Feb 28, 9:28 PM CST	Flash Flood Warning	LZK	Cleburne, Conway, Faulkner, Independence, Jackson, Lonoke and 6 more	5 hr
Feb 28, 9:36 PM CST	Flash Flood Warning	LZK	Conway, Garland, Logan, Montgomery, Perry, Polk and 4 more	4 hr
Feb 28, 11:34 PM CST	Flash Flood Warning	LZK	Hot Spring	3 hr
Feb 28, 11:53 PM CST	Flash Flood Warning	LZK	Arkansas, Calhoun, Clark, Cleveland, Dallas, Desha and 4 more	8 hr
Mar 1, 1:04 AM CST	Flash Flood Warning	LZK	Bradley, Calhoun, Cleveland, Desha, Drew, Lincoln and 1 more	7 hr
Mar 1, 2:02 AM CST	Areal Flood Warning	LZK	Cleburne, Conway, Faulkner, Independence, Jackson, Lonoke and 6 more	15 hr
Mar 1, 2:06 AM CST	Areal Flood Warning	LZK	Conway, Garland, Logan, Montgomery, Perry, Polk and 4 more	12 hr
Mar 1, 2:28 AM CST	Flash Flood Warning	LZK	Hot Spring	3 hr
Mar 1, 5:50 AM CST	Flash Flood Warning	LZK	Hot Spring	6 hr
Mar 1, 7:58 AM CST	Areal Flood Warning	LZK	Clark, Dallas, Faulkner, Garland, Grant, Hot Spring and 6 more	9 hr
Mar 1, 8:01 AM CST	Areal Flood Warning	LZK	Arkansas, Cleveland, Desha, Jefferson, Lincoln, Lonoke and 4 more	9 hr
Mar 1, 8:08 AM CST	Areal Flood Warning	LZK	Bradley, Calhoun, Desha, Drew, Lincoln, Ouachita	9 hr

Nearby

Flash Flood Warnings in Arkansas, 2018 Every flash flood warning in 2018

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.