Alert archive / Louisiana / Heat Advisories in 2021
Heat Advisory 14, NWS New Orleans, LA
NWS New Orleans, LA issued this heat advisory at Aug 19, 2021, 1:26 PM CDT for 15 parishes in Louisiana; 5 counties in Mississippi. It took effect at Aug 20, 2021, 9:00 AM CDT. It was in force for 10 hr.
The area
The counties it named.
The facts
- Issued
- Aug 19, 2021, 1:26 PM CDT (18:26 UTC)
- In effect from
- Aug 20, 2021, 9:00 AM CDT
- Expired
- Aug 20, 2021, 7:00 PM CDT
- In force
- 10 hr
- Issued by
- NWS New Orleans, LA
Counties Assumption Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberville Parish, LA, Orleans Parish, LA, Pointe Coupee Parish, LA, Saint Bernard Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Amite County, MS, Pearl River County, MS, Pike County, MS, Walthall County, MS, Wilkinson County, MS
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 6.4 hours before the alert went out and 100 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.
- Mixed-layer CAPE
- 2791 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 655 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- -26 m²/s²
- 0-3 km storm-relative helicity
- -14 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Aug 19, 12:09 PM CDT, 1 hour 17 minutes earlier.
Area forecast discussion, Aug 19, 12:09 PM CDT, 1 hour 17 minutes before
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</html>The office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 2:58 AM CDT | Heat Advisory | LIX | Assumption, East Baton Rouge, Iberville, Orleans, Saint Bernard, Saint Helena and 6 more | 16 hr |
| Aug 19, 1:26 PM CDT | Excessive Heat Watch | LIX | Orleans, Saint Bernard, Saint James, Saint John the Baptist, Saint Tammany | 24 hr |
| Aug 19, 4:38 PM CDT | Special Weather Statement | LIX | West Baton Rouge | 52 min |
| Aug 19, 5:06 PM CDT | Special Weather Statement | LIX | Saint Helena | 39 min |
| Aug 19, 6:45 PM CDT | Special Weather Statement | LIX | Amite | 45 min |
Nearby
Heat Advisories in Louisiana, 2021Heat Advisories in Mississippi, 2021Every heat advisory in 2021
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.