Alert archive / Louisiana / Flash Flood Warnings in 2019
Flash Flood Warning 19, NWS Shreveport, LA
NWS Shreveport, LA issued this flash flood warning at May 8, 2019, 7:02 PM CDT for Grant Parish, LaSalle Parish, Louisiana. It was in force for 3 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
- May 8, 2019, 7:02 PM CDT (00:02 UTC)
- Expired
- May 8, 2019, 10:00 PM CDT
- In force
- 3 hr
- Issued by
- NWS Shreveport, LA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Grant Parish, LA, LaSalle Parish, LA
The radar
The Ft Polk radar (KPOE), 79 km from the middle of the area, began a volume at 00:04 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, 0.0 hours before the alert went out and 161 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
- 1331 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- 407 m²/s²
- 0-3 km storm-relative helicity
- 530 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 warning 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 warning went out at May 8, 4:45 PM CDT, 2 hours 17 minutes earlier.
Area forecast discussion, May 8, 4:45 PM CDT, 2 hours 17 minutes before
Area Forecast Discussion
National Weather Service Shreveport LA
445 PM CDT Wed May 8 2019
.SHORT TERM.../Tonight through Thursday Night/
Strong to severe QLCS continues to push east across Southern
Arkansas, Northern Louisiana, and Deep East Texas. CAPE values of
1000-2000 J/kg are present just ahead of the complex, but
instability begins to decrease with eastward extent into Northeast
Louisiana. However, surface winds have backed over Southern
Arkansas and Northern Louisiana, with winds from the southeast at
10-15 kts with gusts of 20-25 kts. This is helping to yield 0-1
km SRH values of 200-350 m2/s2 ahead of the QLCS. Therefore, a
threat for QLCS tornadoes will likely persist for several more
hours. In addition, multiple bowing segments have developed along
the complex, which will also pose a threat for damaging straight-
line winds.
Interestingly, some of the CAMs, such as the HRRR and the 3km NAM,
are suggesting the QLCS will rapidly weaken after 00z. Given the
environment ahead of the QLCS, I think the complex will likely
maintain itself longer than the CAMs suggest.The HRRR also
redevelops more scattered convection across East Texas during the
01z-02z time frame this evening. There is a large area of light to
moderate rain ongoing behind the QLCS over East Texas, so I'm
skeptical that the atmosphere will have enough time to sufficiently
recover to more storms to develop so soon. However, latest radar
loops show more isolated storms separated from the convection
heading northeast towards Deep East Texas. This may be what the
HRRR is depicting. In addition, a strong low-level jet remains in
place to provide moisture and shear for severe thunderstorms.
Therefore, Tornado Watch #153 will be maintained for a few more
hours, but will continue to be evaluated.
A threat for severe weather will likely persist in some form
through tonight and into at least midday Thursday. Model guidance
still suggests another QLCS will develop ahead of the approaching
cold front during the overnight hours and will move east into
Southern Arkansas and Louisiana around 12z Thursday morning before
exiting by early afternoon. Yet more scattered storms are possible
immediately ahead of the front late Thursday afternoon and
evening, but widespread severe weather is not anticipated with
that activity.
Given the relative lull that is expected on Thursday, no changes
were made to the Flash Flood Watch. A new watch may be needed for
the later heavy rain event that will occur Friday and into the
weekend, especially based on the rainfall received between now and
Thursday night. More details on that time period are below.
CN
.LONG TERM.../Friday through Tuesday Night/
Sfc cold front front to be just s of the region Friday morning, but
the 850 mb front will be draped across the srn and ern portions of
our region from sw to ne. Meanwhile, a compact disturbance is fcst
to be movg newd across Central and SE TX in swly flow aloft. Heavy
rainfall is likely to develop as this disturbance lifts newd along
the 850 mb front. The sfc front will also eventually lift nwd,
especially as a sfc low/trof axis develop along the TX Gulf
Coast/Deep E TX Friday night. Model output differs quite a bit with
regard to timing of waves of convection, but it seems likely that
multiple rounds of tstms will move across our region through
Saturday.
Base of the nrn stream upper trof will finally force the cold front
through and bring a brief pd of dry weather to the region Sunday
night into Monday. However, another srn stream upper low will
approach from the w for Tuesday, bringing swly flow aloft and more
chances for rain. /12/
&&
.PREV DISCUSSION... /issued 108 PM CDT Wed May 8 2019/
AVIATION...
For the 08/18z TAFs, a line of strong convection is already
affecting Southeast Oklahoma, much of Southwest Arkansas, and
portions of East Texas, including KTYR and KGGG. These storms will
continue to advance eastward across the remainder of the area
through 09/06z. Convection will likely intensify and there may
also be some additional development, especially after 08/21z. Some
of the storms could be severe at times. After this first line of
storms, more convection will likely develop during the overnight
hours, which will likely persist across most of the area through
the end of this TAF cycle. Flight conditions will likely vary
between MVFR/IFR for most of the period, especially due to the
effects of the storms at the terminals.
CN
&&
.PRELIMINARY POINT TEMPS/POPS...
SHV 71 83 60 70 / 100 60 50 70
MLU 71 85 66 74 / 70 70 70 70
DEQ 66 79 52 69 / 90 40 20 40
TXK 69 81 56 67 / 100 50 30 60
ELD 69 83 60 69 / 100 60 50 70
TYR 70 82 54 69 / 50 30 50 60
GGG 71 82 56 70 / 80 50 50 70
LFK 72 83 61 73 / 70 60 70 90
&&
.SHV WATCHES/WARNINGS/ADVISORIES...
AR...Flash Flood Watch through Thursday morning for ARZ050-051-
059>061-070>073.
LA...Flash Flood Watch through Thursday morning for LAZ001>006-
010>012.
OK...Flash Flood Watch through Thursday morning for OKZ077.
TX...Flash Flood Watch through Thursday morning for TXZ096-097-
108>112-124>126-136>138-149>153.
&&
09/12Hazardous weather outlook, May 8, 4:51 PM CDT, 2 hours 11 minutes before
Hazardous Weather Outlook National Weather Service Shreveport LA 451 PM CDT Wed May 8 2019 ARZ060-061-070>073-LAZ001>006-010>014-TXZ097-112-126-137-138- 149>153-091100- Hempstead-Nevada-Miller-Lafayette-Columbia-Union-Caddo-Bossier- Webster-Claiborne-Lincoln-De Soto-Red River-Bienville-Jackson- Ouachita-Bowie-Cass-Marion-Gregg-Harrison-Cherokee-Rusk-Panola- Nacogdoches-Shelby- 451 PM CDT Wed May 8 2019 This Hazardous Weather Outlook is for portions of south central Arkansas, southwest Arkansas, north central Louisiana, northwest Louisiana, east Texas and northeast Texas. .DAY ONE...Tonight... A Tornado Watch is in effect until 11 PM CDT tonight. A Flash Flood Watch is also in effect until 7 AM CDT Thursday morning. Widespread strong to severe thunderstorms will continue to move across the region tonight, bringing the potential for tornadoes, damaging winds, large hail, and flash flooding. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday... Thunderstorms will continue through Thursday as a cold front moves across the area, and a few storms could be severe. A brief reprieve from heavy rainfall will come late Thursday, but heavy rainfall will return Friday through Sunday. Flash flooding will be possible during this timeframe, and additional Flash Flood Watches will likely be needed. .SPOTTER INFORMATION STATEMENT... Activation of emergency management personnel, amateur radio operators and storm spotters will be needed tonight through midday Thursday. LAZ017>022-TXZ165>167-091100- Sabine-Natchitoches-Winn-Grant-Caldwell-La Salle-Angelina- San Augustine- 451 PM CDT Wed May 8 2019 This Hazardous Weather Outlook is for portions of north central Louisiana, northwest Louisiana and east Texas. .DAY ONE...Tonight... A Tornado Watch is in effect until 11 PM CDT tonight. Widespread strong to severe thunderstorms will continue to move across the region tonight, bringing the potential for tornadoes, damaging winds, large hail, and isolated flash flooding. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday... Thunderstorms will continue through Thursday as a cold front moves across the area, and a few storms could be severe. A brief reprieve from heavy rainfall will come late Thursday, but heavy rainfall will return Friday through Sunday. Flash flooding will be possible during this timeframe, and additional Flash Flood Watches will likely be needed. .SPOTTER INFORMATION STATEMENT... Activation of emergency management personnel, amateur radio operators and storm spotters will be needed tonight through midday Thursday. ARZ050-051-059-OKZ077-TXZ096-108>111-124-125-136-091100- Sevier-Howard-Little River-McCurtain-Red River-Franklin-Titus- Camp-Morris-Wood-Upshur-Smith- 451 PM CDT Wed May 8 2019 This Hazardous Weather Outlook is for portions of southwest Arkansas, southeast Oklahoma and northeast Texas. .DAY ONE...Tonight... A Flash Flood Watch is in effect until 7 AM CDT Thursday morning. Widespread strong to severe thunderstorms will continue to move across the region tonight, bringing the potential for tornadoes, damaging winds, large hail, and flash flooding. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday... Thunderstorms will continue through Thursday as a cold front moves across the area, and a few storms could be severe. A brief reprieve from heavy rainfall will come late Thursday, but heavy rainfall will return Friday through Sunday. Flash flooding will be possible during this timeframe, and additional Flash Flood Watches will likely be needed. .SPOTTER INFORMATION STATEMENT... Activation of emergency management personnel, amateur radio operators and storm spotters will be needed tonight through midday Thursday. 09
In the hours before
Local storm report, May 8, 5:46 PM CDT, 1 hour 16 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
546 PM CDT WED MAY 8 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0534 PM TSTM WND DMG JONESBORO 32.23N 92.71W
05/08/2019 JACKSON LA EMERGENCY MNGR
TREES CLOSED ON WALKER ROAD NEAR HWY 167.
&&
POLocal storm report, May 8, 6:01 PM CDT, 1 hour 1 minute 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 |
|---|---|---|---|---|
| May 8, 11:49 PM CDT | Areal Flood Advisory | SHV | Gregg, Harrison, Marion, Panola, Rusk, Shelby | 3 hr |
| May 8, 11:59 PM CDT | Flash Flood Warning | SHV | Cass, Cherokee, Gregg, Harrison, Marion, Nacogdoches and 3 more | 5 hr |
| May 9, 12:03 AM CDT | Flash Flood Warning | SHV | Bowie, Cass | 5 hr |
| May 9, 1:22 AM CDT | Special Weather Statement | SHV | Sabine, San Augustine | 53 min |
| May 9, 3:28 AM CDT | Areal Flood Advisory | SHV | Sabine, San Augustine, Shelby | 2 hr |
| May 9, 3:39 AM CDT | Severe Thunderstorm Warning | SHV | Sabine | 66 min |
| May 9, 4:18 AM CDT | Areal Flood Advisory | SHV | Sabine | 117 min |
| May 9, 4:28 AM CDT | Flash Flood Watch | SHV | Angelina, Cherokee, Gregg, Harrison, Marion, Nacogdoches and 8 more | 63 hr |
| May 9, 4:34 AM CDT | Flash Flood Warning | SHV | Sabine | 4 hr |
| May 9, 4:52 AM CDT | Special Weather Statement | SHV | Sabine | 38 min |
| May 9, 6:14 AM CDT | River Flood Warning | SHV | Nacogdoches, Rusk | 50 hr |
| May 9, 5:34 PM CDT | Severe Thunderstorm Warning | SHV | Angelina, Sabine, San Augustine | 56 min |
| May 9, 12:29 AM CDT | Special Weather Statement | SHV | Bossier, Caddo | 61 min |
| May 9, 1:13 AM CDT | Areal Flood Advisory | SHV | Jackson, Ouachita | 2 hr |
| May 9, 3:08 AM CDT | Special Weather Statement | SHV | Sabine | 52 min |
| May 9, 4:42 AM CDT | Severe Thunderstorm Warning | SHV | Jackson, Natchitoches, Red River, Winn | 63 min |
| May 9, 5:19 AM CDT | Tornado Warning | SHV | Sabine | 26 min |
| May 9, 5:45 AM CDT | Tornado Warning | SHV | Natchitoches, Sabine | 45 min |
| May 9, 5:48 AM CDT | Special Weather Statement | SHV | Caldwell | 42 min |
| May 9, 6:26 AM CDT | Tornado Warning | SHV | Natchitoches | 29 min |
| May 9, 7:00 AM CDT | Special Weather Statement | SHV | Grant, LaSalle | 60 min |
| May 9, 10:09 AM CDT | River Flood Warning | SHV | Bienville, Bossier, Red River, Webster | 13 days |
| May 9, 10:50 AM CDT | River Flood Warning | SHV | Claiborne, Lincoln, Union | 47 hr |
| May 9, 11:55 AM CDT | River Flood Warning | SHV | Caddo | 4 days |
Nearby
Flash Flood Warnings in Louisiana, 2019Every flash flood warning in 2019
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.