Alert archive / Louisiana / Areal Flood Advisories in 2018
Areal Flood Advisory 21, NWS Shreveport, LA
NWS Shreveport, LA issued this areal flood advisory at Feb 25, 2018, 7:13 PM CST for Grant Parish, LaSalle Parish, Natchitoches Parish, Louisiana. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Feb 25, 2018, 7:13 PM CST (01:13 UTC)
- Expired
- Feb 25, 2018, 10:15 PM CST
- In force
- 3 hr
- Issued by
- NWS Shreveport, LA
- Area
- Storm-based polygon
Counties Grant Parish, LA, LaSalle Parish, LA, Natchitoches Parish, LA
The radar
The Ft Polk radar (KPOE), 67 km from the middle of the area, began a volume at 01:14 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
Jackson, MS (KJAN), launched 00:00Z, 1.2 hours before the alert went out and 249 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 708 m above ground
- 0-6 km bulk shear
- 63 kt
- 0-1 km storm-relative helicity
- -42 m²/s²
- 0-3 km storm-relative helicity
- 36 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this areal flood advisory 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 areal flood advisory went out at Feb 25, 6:16 PM CST, 57 minutes earlier.
Area forecast discussion, Feb 25, 6:16 PM CST, 57 minutes before
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</html>The office that day
Everything else NWS Shreveport, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 25, 7:27 PM CST | River Flood Warning | SHV | Sabine, San Augustine | 3 days |
| Feb 26, 11:26 AM CST | River Flood Warning | SHV | Angelina, Cherokee, Nacogdoches | 17 days |
| Feb 26, 2:44 PM CST | Flash Flood Watch | SHV | Bowie, Camp, Cass, Franklin, Gregg, Harrison and 9 more | 69 hr |
| Feb 25, 6:47 PM CST | Areal Flood Advisory | SHV | Jackson, Ouachita | 3 hr |
| Feb 26, 12:07 PM CST | River Flood Warning | SHV | Grant, Natchitoches, Winn | 14 days |
Nearby
Areal Flood Advisories in Louisiana, 2018Every areal flood 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; radar from the NEXRAD Level II archive.