Alert archive / Louisiana / Flash Flood Watches in 2018

Flash Flood Watch 1, NWS Lake Charles, LA

January 27, 20184 parishes in Louisiana

NWS Lake Charles, LA issued this flash flood watch at Jan 27, 2018, 2:49 AM CST for 4 parishes in Louisiana. It was in force for 15 hr.

The area

The counties it named.

The facts

Issued: Jan 27, 2018, 2:49 AM CST (08:49 UTC)
Expired: Jan 27, 2018, 6:00 PM CST
In force: 15 hr
Issued by: NWS Lake Charles, LA
Flood severity: None

Counties Cameron Parish, LA, Lafayette Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA

The radar

The Lake Charles radar (KLCH), 96 km from the middle of the area, began a volume at 08:53 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

Lake Charles Mun, LA (KLCH), launched 00:00Z, 8.8 hours before the alert went out and 95 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: 24 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 672 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 128 m²/s²
0-3 km storm-relative helicity: 219 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 flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Lake Charles, LA wrote its last area forecast discussion before this flash flood watch went out at Jan 26, 11:44 PM CST, 3 hours 5 minutes earlier.

Area forecast discussion, Jan 26, 11:44 PM CST, 3 hours 5 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, Jan 26, 5:33 AM CST, 21 hours 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>

The office that day

Everything else NWS Lake Charles, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 27, 4:40 AM CST	Areal Flood Advisory	LCH	Calcasieu, Cameron, Jefferson Davis	3 hr
Jan 27, 5:44 AM CST	Areal Flood Advisory	LCH	Vermilion	2 hr
Jan 27, 7:02 AM CST	Areal Flood Advisory	LCH	Iberia, Lafayette, Saint Martin, Vermilion	58 min
Jan 27, 7:05 AM CST	Flash Flood Warning	LCH	Calcasieu, Cameron	115 min
Jan 27, 7:40 AM CST	Areal Flood Advisory	LCH	Calcasieu, Cameron, Jefferson Davis	2 hr
Jan 27, 8:00 AM CST	Flash Flood Warning	LCH	Iberia, Lafayette, Saint Martin, Vermilion	2 hr
Jan 27, 8:29 AM CST	Flash Flood Warning	LCH	Calcasieu, Cameron, Jefferson Davis	3 hr
Jan 27, 10:14 AM CST	River Flood Warning	LCH	Acadia, Evangeline, Saint Landry	48 hr
Jan 27, 10:14 AM CST	River Flood Warning	LCH	Rapides	6 days
Jan 27, 10:14 AM CST	River Flood Warning	LCH	Calcasieu	4 days
Jan 27, 10:14 AM CST	River Flood Warning	LCH	Calcasieu	7 days
Jan 27, 11:59 AM CST	River Flood Warning	LCH	Lafayette, Vermilion	23 hr
Jan 27, 5:15 AM CST	Flash Flood Warning	LCH	Jefferson	2 hr
Jan 27, 9:04 AM CST	Areal Flood Warning	LCH	Jefferson, Orange	3 hr

Nearby

Flash Flood Watches in Louisiana, 2018 Flash Flood Watches in Texas, 2018 Every flash flood watch 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.