Alert archive / Louisiana / Flash Flood Watches in 2017

Flash Flood Watch 1, NWS Shreveport, LA

April 2, 201714 counties in Texas; 17 parishes in Louisiana

NWS Shreveport, LA issued this flash flood watch at Apr 2, 2017, 4:30 AM CDT for 14 counties in Texas; 17 parishes in Louisiana. It took effect at Apr 2, 2017, 10:00 AM CDT. It was in force for 18 hr.

The area

The counties it named.

The facts

Issued: Apr 2, 2017, 4:30 AM CDT (09:30 UTC)
In effect from: Apr 2, 2017, 10:00 AM CDT
Expired: Apr 3, 2017, 3:38 AM CDT
In force: 18 hr
Issued by: NWS Shreveport, LA
Flood severity: None

All 31 counties

Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Sabine Parish, LA, Union Parish, LA, Webster Parish, LA, Winn Parish, LA, Angelina County, TX, Cherokee County, TX, Gregg County, TX, Harrison County, TX, Marion County, TX, Nacogdoches County, TX, Panola County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Smith County, TX, Upshur County, TX, Wood County, TX

The radar

The Shreveport radar (KSHV), 34 km from the middle of the area, began a volume at 09:31 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, 9.5 hours before the alert went out and 233 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: 2894 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 78 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 Shreveport, LA wrote its last area forecast discussion before this flash flood watch went out at Apr 2, 12:17 AM CDT, 4 hours 13 minutes earlier.

Area forecast discussion, Apr 2, 12:17 AM CDT, 4 hours 13 minutes before

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Hazardous weather outlook, Apr 1, 12:09 PM CDT, 16 hours 21 minutes before

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<body>
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    <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.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 2, 8:26 AM CDT	Special Weather Statement	SHV	Cherokee	49 min
Apr 2, 8:53 AM CDT	Special Weather Statement	SHV	Cherokee	52 min
Apr 2, 9:04 AM CDT	Special Weather Statement	SHV	Nacogdoches	41 min
Apr 2, 9:10 AM CDT	Severe Thunderstorm Warning	SHV	Angelina, Cherokee, Nacogdoches, Rusk	65 min
Apr 2, 9:22 AM CDT	Severe Thunderstorm Warning	SHV	Angelina, Cherokee, Nacogdoches	53 min
Apr 2, 9:25 AM CDT	Special Weather Statement	SHV	Panola, Shelby	35 min
Apr 2, 9:42 AM CDT	Tornado Warning	SHV	Panola, Shelby	48 min
Apr 2, 10:13 AM CDT	Severe Thunderstorm Warning	SHV	Angelina, Nacogdoches	47 min
Apr 2, 10:34 AM CDT	Special Weather Statement	SHV	Harrison, Panola	41 min
Apr 2, 10:56 AM CDT	Severe Thunderstorm Warning	SHV	Nacogdoches, Panola, Rusk, San Augustine, Shelby	64 min
Apr 2, 11:34 AM CDT	Severe Thunderstorm Warning	SHV	Harrison, Nacogdoches, Panola, San Augustine, Shelby	56 min
Apr 2, 11:41 AM CDT	Tornado Warning	SHV	Shelby	49 min
Apr 2, 11:56 AM CDT	Tornado Warning Tornado observed	SHV	Panola, Shelby	49 min
Apr 2, 12:42 PM CDT	Severe Thunderstorm Warning	SHV	Gregg, Harrison, Marion, Nacogdoches, Panola, Rusk and 1 more	63 min
Apr 2, 12:51 PM CDT	Areal Flood Warning	SHV	Nacogdoches	3 hr
Apr 2, 1:02 PM CDT	Tornado Warning	SHV	Harrison, Panola	43 min
Apr 2, 1:09 PM CDT	Severe Thunderstorm Warning	SHV	Angelina, Cherokee, Nacogdoches, Rusk, San Augustine	66 min
Apr 2, 1:16 PM CDT	Tornado Warning	SHV	Nacogdoches, Panola, San Augustine, Shelby	44 min
Apr 2, 1:41 PM CDT	River Flood Warning	SHV	Angelina, Cherokee, Nacogdoches	5 days
Apr 2, 1:41 PM CDT	River Flood Warning	SHV	Nacogdoches, Rusk, San Augustine, Shelby	5 days
Apr 2, 1:41 PM CDT	Tornado Warning	SHV	Bowie, Camp, Cass, Marion, Morris, Titus and 1 more	34 min
Apr 2, 1:46 PM CDT	River Flood Warning	SHV	Anderson, Cherokee, Houston, Trinity	4 days
Apr 2, 1:46 PM CDT	River Flood Warning	SHV	Angelina, Houston, Polk, Trinity, Tyler	4 days
Apr 2, 1:46 PM CDT	River Flood Warning	SHV	Gregg	67 hr
Apr 2, 1:52 PM CDT	Severe Thunderstorm Warning	SHV	Angelina, Nacogdoches, Panola, Sabine, San Augustine, Shelby	53 min
Apr 2, 2:41 PM CDT	Severe Thunderstorm Warning	SHV	Sabine	64 min
Apr 2, 3:05 PM CDT	Tornado Warning	SHV	Sabine	40 min
Apr 2, 9:31 AM CDT	Special Weather Statement	SHV	De Soto, Red River	44 min
Apr 2, 9:48 AM CDT	Severe Thunderstorm Warning	SHV	Bienville, Bossier, Caddo, De Soto, Red River, Webster	42 min
Apr 2, 10:37 AM CDT	Special Weather Statement	SHV	Bossier, Caddo, Claiborne, Webster	38 min
Apr 2, 12:12 PM CDT	Severe Thunderstorm Warning	SHV	Caldwell, Ouachita	63 min
Apr 2, 12:29 PM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo, De Soto, Webster	18 min
Apr 2, 1:41 PM CDT	River Flood Warning	SHV	Bossier, Webster	45 hr
Apr 2, 1:42 PM CDT	River Flood Warning	SHV	Webster	19 days
Apr 2, 1:44 PM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo, De Soto, Red River	61 min
Apr 2, 1:50 PM CDT	Severe Thunderstorm Warning	SHV	Claiborne	40 min
Apr 2, 1:53 PM CDT	Tornado Warning	SHV	Grant, Natchitoches, Winn	27 min
Apr 2, 2:18 PM CDT	Severe Thunderstorm Warning	SHV	Caldwell, Ouachita	24 min
Apr 2, 2:29 PM CDT	Tornado Warning	SHV	Grant, LaSalle	46 min
Apr 2, 2:37 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Bossier, Caddo, Claiborne, De Soto, Red River and 1 more	53 min
Apr 2, 3:02 PM CDT	Tornado Warning Tornado observed	SHV	LaSalle	43 min
Apr 2, 3:15 PM CDT	Areal Flood Warning	SHV	Bossier, Caddo	3 hr
Apr 2, 3:20 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Caldwell, Claiborne, Jackson, Lincoln, Ouachita and 1 more	55 min
Apr 2, 3:32 PM CDT	Severe Thunderstorm Warning	SHV	Grant, Natchitoches, Winn	20 min
Apr 2, 3:36 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Grant, Jackson, Natchitoches, Red River, Winn	39 min
Apr 2, 3:40 PM CDT	Severe Thunderstorm Warning	SHV	Grant, LaSalle	30 min
Apr 2, 3:46 PM CDT	Tornado Warning	SHV	Grant, LaSalle	18 min
Apr 2, 3:49 PM CDT	Tornado Warning	SHV	Caldwell	41 min
Apr 2, 3:51 PM CDT	Severe Thunderstorm Warning	SHV	Grant, LaSalle, Winn	34 min
Apr 2, 3:58 PM CDT	Tornado Warning	SHV	Caldwell, Grant, Winn	17 min
Apr 2, 4:02 PM CDT	Tornado Warning EmergencyConsiderable damage threat	SHV	Caldwell, LaSalle	43 min
Apr 2, 4:04 PM CDT	Tornado Warning	SHV	Grant, Natchitoches, Winn	41 min
Apr 2, 4:12 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Caldwell, Grant, Jackson, LaSalle, Natchitoches and 1 more	78 min
Apr 2, 4:14 PM CDT	Severe Thunderstorm Warning	SHV	Caldwell, Jackson, Ouachita, Union	29 min
Apr 2, 4:58 PM CDT	Tornado Warning	SHV	Caldwell, LaSalle, Winn	47 min
Apr 2, 5:13 PM CDT	Flash Flood Warning	SHV	Caldwell, Grant, LaSalle, Natchitoches, Sabine, Winn	10 hr
Apr 2, 5:45 PM CDT	Severe Thunderstorm Warning	SHV	Grant, LaSalle, Natchitoches	60 min
Apr 2, 5:50 PM CDT	Tornado Warning	SHV	Grant, LaSalle	40 min
Apr 2, 6:15 PM CDT	Severe Thunderstorm Warning	SHV	LaSalle	46 min
Apr 2, 6:40 PM CDT	Severe Thunderstorm Warning	SHV	Grant	50 min

Nearby

Flash Flood Watches in Louisiana, 2017 Flash Flood Watches in Texas, 2017 Every flash flood watch in 2017

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.