Alert archive / Louisiana / Flash Flood Watches in 2017
Flash Flood Watch 7, NWS Shreveport, LA
NWS Shreveport, LA issued this flash flood watch at Aug 27, 2017, 4:00 AM CDT for 7 counties in Texas; 17 parishes in Louisiana. It took effect at Aug 27, 2017, 4:06 AM CDT. It was in force for 4 days.
The area
The counties it named.
The facts
- Issued
- Aug 27, 2017, 4:00 AM CDT (09:00 UTC)
- In effect from
- Aug 27, 2017, 4:06 AM CDT
- Expired
- Aug 31, 2017, 8:11 AM CDT
- In force
- 4 days
- Issued by
- NWS Shreveport, LA
- Flood severity
- None
All 24 counties
Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Sabine Parish, LA, Union Parish, LA, Webster Parish, LA, Winn Parish, LA, Angelina County, TX, Cherokee County, TX, Nacogdoches County, TX, Panola County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX
The radar
The Shreveport radar (KSHV), 62 km from the middle of the area, began a volume at 09:02 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
Shreveport, LA (KBAD), launched 00:00Z, 9.0 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.
- Mixed-layer CAPE
- 509 J/kg
- Mixed-layer CIN
- -54 J/kg
- Mixed-layer LCL
- 953 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 82 m²/s²
- 0-3 km storm-relative helicity
- 103 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this flash flood watch 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 flash flood watch went out at Aug 26, 11:32 PM CDT, 4 hours 28 minutes earlier.
Area forecast discussion, Aug 26, 11:32 PM CDT, 4 hours 28 minutes before
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</html>Hazardous weather outlook, Aug 26, 4:16 PM CDT, 11 hours 44 minutes before
Hazardous Weather Outlook National Weather Service Shreveport LA 416 PM CDT Sat Aug 26 2017 ARZ050-051-059>061-070>073-LAZ001>006-010>014-018>022-OKZ077- TXZ096-097-108>112-124>126-136>138-150-151-272130- Sevier-Howard-Little River-Hempstead-Nevada-Miller-Lafayette- Columbia-Union-Caddo-Bossier-Webster-Claiborne-Lincoln-De Soto- Red River-Bienville-Jackson-Ouachita-Natchitoches-Winn-Grant- Caldwell-La Salle-McCurtain-Bowie-Franklin-Titus-Camp-Morris-Cass- Wood-Upshur-Marion-Smith-Gregg-Harrison-Rusk-Panola- 416 PM CDT Sat Aug 26 2017 This Hazardous Weather Outlook is for portions of south central Arkansas, southwest Arkansas, north central Louisiana, northwest Louisiana, southeast Oklahoma and northeast Texas. .DAY ONE...Tonight... Scattered showers and thunderstorms will be possible today across the four region area due to the effects of Tropical Storm Harvey still located well to our south. Daytime heating will be limited due to extensive cloud cover, but a few stronger bands of heavy rainfall could materialize during the afternoon. Otherwise, no hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Sunday through Friday... The track of Harvey is still somewhat uncertain through next week, but rainfall amounts are expected to increase across our region by the middle and latter part of the week as Harvey finally begins to shift farther north and east. Additional rainfall totals next week of three to six inches with isolated higher amounts close to eight inches are possible across much of east Texas and north Louisiana with enhanced sea breeze bands through mid to late week. This may pose a flash flooding potential, but the uncertainty with Harvey's eventual track makes this threat still somewhat unclear at this time. .SPOTTER INFORMATION STATEMENT... Activation of emergency management personnel...amateur radio operators and storm spotters will not be needed through tonight. LAZ017-TXZ149-152-153-165>167-272130- Sabine-Cherokee-Nacogdoches-Shelby-Angelina-San Augustine- 416 PM CDT Sat Aug 26 2017 This Hazardous Weather Outlook is for portions of northwest Louisiana, east Texas and northeast Texas. .DAY ONE...Tonight... Scattered showers and thunderstorms will be possible today across the four region area due to the effects of Tropical Storm Harvey still located well to our south. Daytime heating will be limited due to extensive cloud cover, but a few stronger bands of heavy rainfall could materialize during the afternoon. The outermost bands could also present a weak tornadic potential through the evening hours. Otherwise, no hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Sunday through Friday... The track of Harvey is still somewhat uncertain through next week, but rainfall amounts are expected to increase across our region by the middle and latter part of the week as Harvey finally begins to shift farther north and east. Additional rainfall totals next week of three to six inches with isolated higher amounts close to eight inches are possible across much of east Texas and north Louisiana with enhanced sea breeze bands through mid to late week. This may pose a flash flooding potential, but the uncertainty with Harvey's eventual track makes this threat still somewhat unclear at this time. .SPOTTER INFORMATION STATEMENT... Activation of emergency management personnel...amateur radio operators and storm spotters should not be needed through tonight. 19
The office that day
Everything else NWS Shreveport, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 27, 3:42 AM CDT | River Flood Warning | SHV | Angelina, Houston, Polk, Trinity, Tyler | 8 days |
Nearby
Flash Flood Watches in Louisiana, 2017Flash Flood Watches in Texas, 2017Every flash flood watch 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.