Alert archive / Louisiana / Hurricane Warnings in 2020

Hurricane Warning 1019, NWS New Orleans, LA

September 13, 20205 parishes in Louisiana; Pearl River County, Mississippi

NWS New Orleans, LA issued this hurricane warning at Sep 13, 2020, 4:25 AM CDT for 5 parishes in Louisiana; Pearl River County, Mississippi. It was in force for 72 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
Sep 13, 2020, 4:25 AM CDT (09:25 UTC)
Expired
Sep 16, 2020, 4:21 AM CDT
In force
72 hr
Issued by
NWS New Orleans, LA

Counties Assumption Parish, LA, Saint Bernard Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Washington Parish, LA, Pearl River County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 9.4 hours before the alert went out and 57 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, Slidell Radar S, LA at 00:00Z on 2020-09-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1153 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, Slidell Radar S, LA at 00:00Z on 2020-09-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 77 square meters per square second.1939Sfc1 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
1153 J/kg
Mixed-layer CIN
-16 J/kg
Mixed-layer LCL
766 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
77 m²/s²
0-3 km storm-relative helicity
76 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 13, 4:25 AM CDTStorm Surge WarningLIXSaint Bernard, Saint John the Baptist69 hr
Sep 13, 4:25 AM CDTTropical Storm WarningLIXAssumption, East Baton Rouge, East Feliciana, Saint Bernard, Saint Helena, Saint James and 2 more3 days
Sep 13, 8:45 AM CDTSpecial Marine WarningLIX29 min
Sep 13, 4:19 PM CDTCoastal Flood AdvisoryLIX38 hr

Nearby

Hurricane Warnings in Louisiana, 2020Hurricane Warnings in Mississippi, 2020Every hurricane warning in 2020

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.