Alert archive / Louisiana / Areal Flood Warnings in 2017

Areal Flood Warning 4, NWS Lake Charles, LA

April 3, 20179 parishes in Louisiana; Newton County, Texas

NWS Lake Charles, LA issued this areal flood warning at Apr 3, 2017, 6:22 AM CDT for 9 parishes in Louisiana; Newton County, Texas. It was in force for 6 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
Apr 3, 2017, 6:22 AM CDT (11:22 UTC)
Expired
Apr 3, 2017, 12:15 PM CDT
In force
6 hr
Issued by
NWS Lake Charles, LA
Area
Storm-based polygon
Flood severity
None

Counties Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Evangeline Parish, LA, Lafayette Parish, LA, Rapides Parish, LA, Saint Landry Parish, LA, Vernon Parish, LA, Newton County, TX

The radar

The Ft Polk radar (KPOE), 56 km from the middle of the area, began a volume at 11:24 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, 11.4 hours before the alert went out and 86 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-pSkew-T log-p diagram, Lake Charles Mun, LA at 00:00Z on 2017-04-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2242 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lake Charles Mun, LA at 00:00Z on 2017-04-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 224 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
2242 J/kg
Mixed-layer CIN
-16 J/kg
Mixed-layer LCL
522 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
224 m²/s²
0-3 km storm-relative helicity
281 m²/s²
Significant tornado parameter
4.2
Supercell composite
14.7

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood warning 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 areal flood warning went out at Apr 3, 4:15 AM CDT, 2 hours 7 minutes earlier.

Area forecast discussion, Apr 3, 4:15 AM CDT, 2 hours 7 minutes before
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Hazardous weather outlook, Apr 3, 5:04 AM CDT, 1 hour 18 minutes before
Hazardous Weather Outlook
National Weather Service Lake Charles LA
504 AM CDT Mon Apr 3 2017

LAZ027>033-041>045-052>055-073-074-TXZ180-201-215-216-259>262-
041015-
Vernon-Rapides-Avoyelles-Beauregard-Allen-Evangeline-St. Landry-
Calcasieu-Jefferson Davis-Acadia-Lafayette-Upper St. Martin-
Vermilion-Iberia-St. Mary-Lower St. Martin-West Cameron-
East Cameron-Tyler-Hardin-Jefferson-Orange-Northern Jasper-
Northern Newton-Southern Jasper-Southern Newton-
504 AM CDT Mon Apr 3 2017

This Hazardous Weather Outlook is for portions of central
Louisiana, south central Louisiana, southwest Louisiana, west
central Louisiana, and southeast Texas.

.DAY ONE...Today and Tonight
While rainfall has ended across the area, flash flooding will
continue across parts of the area through the morning as flood
waters continue to run off.

Patchy fog this morning will have the potential to reduce
visibilities in some areas. Use caution when driving as
visibilities can vary significantly over short distances.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday
Patchy fog may develop early Tuesday morning. Use caution
when driving as visibilities can vary significantly over short
distances.

A cold front will move through the area Wednesday spawning
isolated showers and thunderstorms. These storms are not expected
to be severe.

.SPOTTER INFORMATION STATEMENT...
Spotter activation is not anticipated.

GMZ430-432-435-450-452-455-470-472-475-041015-
Sabine Lake-Calcasieu Lake-Vermilion Bay-
Coastal waters from Cameron LA to High Island TX out 20 NM-
Coastal waters from Intracoastal City to Cameron LA out 20 NM-
Coastal waters from Lower Atchafalaya River to Intracoastal City
LA out 20 NM-
Waters from Cameron LA to High Island TX from 20 to 60 NM-
Waters from  Intracoastal City to Cameron LA from 20 to 60 NM-
Waters from Lower Atchafalaya River to Intracoastal City LA from
20 to 60 NM-
504 AM CDT Mon Apr 3 2017

This Hazardous Weather Outlook is for portions of Gulf of Mexico.

.DAY ONE...Today and Tonight
A small craft advisory is in effect until 7 am this morning. Winds
of 20-25 MPH and seas of 5-7 feet will be possible during this
period. Winds and seas will weaken through the day.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday
A cold front will move through the area Wednesday spawning
isolated showers and thunderstorms. These storms are not expected
to be severe.

.SPOTTER INFORMATION STATEMENT...
Spotter activation is not anticipated.

In the hours before

Special weather statement, Apr 3, 4:38 AM CDT, 1 hour 44 minutes before
Special Weather Statement
National Weather Service Lake Charles LA
438 AM CDT MON APR 3 2017

LAZ053>055-031045-
Lower St. Martin LA-Iberia LA-St. Mary LA-
438 AM CDT MON APR 3 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN IBERIA...ST. MARY
AND SOUTHEASTERN ST. MARTIN PARISHES UNTIL 545 AM CDT...

At 438 AM CDT, Doppler radar was tracking a strong thunderstorm 7
miles southwest of Belle River, moving northeast at 60 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Morgan City, Franklin, Patterson, Berwick, Stephensville, Burns
Point, Bayou Vista, Baldwin, Ellerslie, Patterson Memorial Airport,
Charenton and Centerville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 2968 9110 2954 9141 2955 9140 2952 9155
      2955 9152 2964 9156 2963 9162 2964 9164
      2975 9160 2976 9162 2979 9161 3006 9138
      3006 9127 3003 9124 3004 9122 3000 9126
      2998 9126 2984 9119 2983 9112 2980 9109
TIME...MOT...LOC 0938Z 231DEG 51KT 2984 9131

K. Kuyper

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 2, 7:02 PM CDTSpecial Weather StatementLCHBeauregard, Vernon43 min
Apr 2, 7:10 PM CDTSevere Thunderstorm WarningLCHRapides35 min
Apr 2, 7:28 PM CDTSpecial Weather StatementLCHRapides32 min
Apr 2, 7:34 PM CDTSevere Thunderstorm WarningLCHRapides, Vernon26 min
Apr 2, 8:04 PM CDTSpecial Weather StatementLCHRapides, Vernon41 min
Apr 2, 8:36 PM CDTSpecial Weather StatementLCHBeauregard39 min
Apr 2, 8:59 PM CDTRiver Flood WarningLCHVernon5 days
Apr 2, 8:59 PM CDTRiver Flood WarningLCHBeauregard, Calcasieu8 days
Apr 2, 9:09 PM CDTSpecial Weather StatementLCHRapides51 min
Apr 2, 9:27 PM CDTSpecial Weather StatementLCHBeauregard48 min
Apr 2, 9:28 PM CDTAreal Flood AdvisoryLCHCalcasieu, Jefferson Davis2 hr
Apr 2, 9:49 PM CDTFlash Flood WarningLCHRapides, Vernon3 hr
Apr 2, 10:04 PM CDTFlash Flood WarningLCHAllen, Avoyelles, Beauregard, Evangeline, Rapides2 hr
Apr 2, 10:20 PM CDTRiver Flood WarningLCHCalcasieu70 hr
Apr 2, 10:20 PM CDTRiver Flood WarningLCHBeauregard4 days
Apr 2, 11:29 PM CDTRiver Flood WarningLCHBeauregard, Vernon53 hr
Apr 2, 11:32 PM CDTAreal Flood AdvisoryLCHCalcasieu118 min
Apr 3, 12:38 AM CDTFlash Flood WarningLCHAllen, Avoyelles, Beauregard, Evangeline, Rapides, Vernon6 hr
Apr 3, 12:39 AM CDTFlash Flood WarningLCHAcadia, Evangeline, Saint Landry6 hr
Apr 3, 3:36 AM CDTSmall Craft AdvisoryLCH3 hr
Apr 3, 4:38 AM CDTSpecial Weather StatementLCHSt. Mary67 min
Apr 3, 10:37 AM CDTRiver Flood WarningLCHAllen5 days
Apr 3, 10:37 AM CDTRiver Flood WarningLCHAllen8 days
Apr 3, 10:37 AM CDTRiver Flood WarningLCHAllen, Jefferson Davis7 days
Apr 3, 10:37 AM CDTRiver Flood WarningLCHAllen4 days
Apr 3, 10:37 AM CDTRiver Flood WarningLCHAcadia, Allen, Evangeline, Jefferson Davis72 hr
Apr 3, 1:02 PM CDTAreal Flood WarningLCHAllen, Avoyelles, Beauregard, Evangeline, Rapides, Vernon12 hr
Apr 3, 12:44 AM CDTAreal Flood WarningLCHHardin, Jasper, Newton, Tyler6 hr

Nearby

Areal Flood Warnings in Louisiana, 2017Areal Flood Warnings in Texas, 2017Every areal flood warning 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.