Alert archive / Louisiana / Heat Advisories in 2018

Heat Advisory 2, NWS New Orleans, LA

June 30, 20186 parishes in Louisiana; Pearl River County, Mississippi

NWS New Orleans, LA issued this heat advisory at Jun 30, 2018, 1:38 PM CDT for 6 parishes in Louisiana; Pearl River County, Mississippi. It was in force for 5 hr.

The area

The counties it named.

The facts

Issued
Jun 30, 2018, 1:38 PM CDT (18:38 UTC)
Expired
Jun 30, 2018, 7:00 PM CDT
In force
5 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, Tangipahoa Parish, LA, Washington Parish, LA, Pearl River County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 6.6 hours before the alert went out and 59 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 12:00Z on 2018-06-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2233 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 12:00Z on 2018-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -29 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
2233 J/kg
Mixed-layer CIN
-19 J/kg
Mixed-layer LCL
679 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
-29 m²/s²
0-3 km storm-relative helicity
-11 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 heat advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS New Orleans, LA wrote its last area forecast discussion before this heat advisory went out at Jun 30, 1:24 PM CDT, 14 minutes earlier.

Area forecast discussion, Jun 30, 1:24 PM CDT, 14 minutes before
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Hazardous weather outlook, Jun 30, 12:54 PM CDT, 44 minutes before
Hazardous Weather Outlook
National Weather Service New Orleans LA
1254 PM CDT Sat Jun 30 2018

GMZ530-532-534-536-538-550-552-555-557-570-572-575-577-LAZ034>037-
039-040-046>050-056>072-MSZ068>071-077-080>082-010600-
Lake Pontchartrain and Lake Maurepas-Mississippi Sound-
Lake Borgne-Chandeleur Sound-Breton Sound-
Coastal Waters from Port Fourchon LA to Lower Atchafalaya River
LA out 20 nm-
Coastal waters from the Southwest Pass of the Mississippi River
to Port Fourchon Louisiana out 20 NM-
Coastal Waters from Boothville LA to Southwest Pass of the
Mississippi River out 20 nm-
Coastal waters from Pascagoula Mississippi to Stake Island out
20 NM-
Coastal waters from Port Fourchon Louisiana to Lower Atchafalaya
River LA from 20 to 60 NM-
Coastal waters from Southwest Pass of the Mississippi River to
Port Fourchon Louisiana from 20 to 60 NM-
Coastal Waters from Stake Island LA to Southwest Pass of the
Mississippi River from 20 to 60 nm-
Coastal waters from Pascagoula Mississippi to Stake Island
Louisiana out 20 to 60 NM-Pointe Coupee-West Feliciana-
East Feliciana-St. Helena-Washington-St. Tammany-Iberville-
West Baton Rouge-East Baton Rouge-Ascension-Livingston-Assumption-
St. James-St. John The Baptist-Upper Lafourche-St. Charles-
Upper Jefferson-Orleans-Upper Plaquemines-Upper St. Bernard-
Upper Terrebonne-Lower Terrebonne-Lower Lafourche-Lower Jefferson-
Lower Plaquemines-Lower St. Bernard-Northern Tangipahoa-
Southern Tangipahoa-Wilkinson-Amite-Pike-Walthall-Pearl River-
Hancock-Harrison-Jackson-
1254 PM CDT Sat Jun 30 2018

This Hazardous Weather Outlook is for portions of Southeast
Louisiana...South Mississippi and the adjacent coastal waters.

.DAY ONE...This Afternoon and Tonight

Afternoon heat indices are expected to rise to 105 to 108 degrees
through the early afternoon hours. Take extra precautions if you
work or spend time outside to avoid heat illnesses.

In addition, a few strong thunderstorms will be possible this
afternoon. The main threats will be gusty winds, frequent
lightning and locally heavy rainfall.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

Thunderstorm coverage will become more numerous Monday through
Wednesday. Severe weather is not expected but a few storms could
become strong, producing gusty winds and frequent lightning.

However, heavy rainfall will be possible and could lead to street
flooding, ponding of water in low lying areas and areas of poor
drainage Monday through Wednesday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated.

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 29, 7:28 PM CDTSpecial Weather StatementLIXSaint John the Baptist62 min
Jun 30, 2:50 PM CDTSpecial Marine WarningLIX55 min
Jun 30, 3:44 PM CDTSpecial Marine WarningLIX61 min
Jun 30, 4:14 PM CDTSpecial Weather StatementLIXTerrebonne31 min
Jun 30, 5:29 PM CDTSpecial Marine WarningLIX61 min
Jun 30, 6:10 PM CDTSpecial Marine WarningLIX65 min
Jun 30, 2:57 PM CDTSpecial Weather StatementLIXJackson33 min
Jun 30, 5:02 PM CDTSevere Thunderstorm WarningLIXHarrison, Jackson28 min
Jun 30, 5:40 PM CDTSpecial Weather StatementLIXPearl River65 min

Nearby

Heat Advisories in Louisiana, 2018Heat Advisories in Mississippi, 2018Every heat advisory 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.