Heavy rain in a slow moving thunderstorm produced flooding in Acadia Parish.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS LCH wrote it up.
Heavy rain in a slow moving thunderstorm produced flooding in Acadia Parish.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Lake Charles, LA wrote its last area forecast discussion before the first event at Jul 20, 8:22 AM CST, 2 hours 28 minutes earlier.
Area Forecast Discussion National Weather Service Lake Charles LA 922 AM CDT Tue Jul 20 2021 .UPDATE...A weak cold front is drifting into the region today while an upper low is in vicinity. Most convection has remained offshore this morning, however scattered to numerous showers and storms will remain possible through the day. Only a minor adjustment was needed to the pops this morning to reflect current trends. && .PREV DISCUSSION... /issued 607 AM CDT Tue Jul 20 2021/ DISCUSSION... 12Z TAFS AVIATION... Scattered to widespread showers and thunderstorms will persist through the day as a weak frontal boundary slowly pushes south into the region. Periods of heavy rainfall, gusty winds and frequent lightning will accompany some storms. Convection will become isolated late tonight. Away from storms, VFR conditions will prevail with light and variable winds. PREV DISCUSSION... /issued 407 AM CDT Tue Jul 20 2021/ DISCUSSION... SHORT TERM [Today through Thursday Night]... A weak frontal boundary across north Louisiana this morning associated with a southwestward advancing upper low is providing support for widespread showers and thunderstorms early this morning. Expect scattered to widespread convection to persist through much of the day as the front continues to sink south. WPC continues to maintain a marginal risk of excessive rainfall across the entire region and localized flash flooding will be possible today should multiple storms train over already saturated soils The cut off low is progged to continue to retrograde southwest into Texas Wednesday into Thursday as it wraps around the southern periphery of an upper ridge over the four corners region of the southwestern U.S. This will maintain scattered to widespread convection through the middle of the week especially during the afternoon with the aid of diurnal heating. Jones LONG TERM [Friday through Tuesday]... An upper level pattern shift is expected to begin by Friday as the mid to upper level trough moves further westward, slowly being replaced by a mid to upper level ridge of high pressure. For Friday, shower and thunderstorm chances are lower, still in the 40-50% for the afternoon hours. For Saturday through Tuesday, the ridge aloft builds even stronger, suppressing precipitation chances around 20% for Saturday and Sunday afternoons. By Monday and Tuesday, an upper level low moving across the Caribbean is expected to move across the Western Gulf into Texas by this time, bringing a slight increase in instability, with the afternoon shower and thunderstorm chances around 20-30% along the I- 10 corridor. Afternoon high temperatures around the lower 90 along the I-10 corridor, mid 90s further north, and morning lows in the mid 70s, except upper 70s south of I-10. Heat index values expected to rise into the 100-105 degree range during this period. DML MARINE... Light to moderate onshore flow will prevail through the forecast period as weak high pressure remains stationed over the northeastern Gulf of Mexico. Scattered showers and thunderstorms are expected through Friday. Winds and seas will be higher in and near thunderstorm activity. && .PRELIMINARY POINT TEMPS/POPS... AEX 85 72 89 74 / 80 30 60 10 LCH 86 73 88 76 / 90 30 60 30 LFT 84 74 88 76 / 100 50 70 20 BPT 87 72 89 75 / 80 30 60 30 && .LCH WATCHES/WARNINGS/ADVISORIES... LA...None. TX...None. GM...None. &&
Hazardous Weather Outlook National Weather Service Lake Charles LA 400 AM CDT Tue Jul 20 2021 LAZ027>033-041>045-052>055-073-074-TXZ180-201-215-216-259>262-210900- Vernon-Rapides-Avoyelles-Beauregard-Allen-Evangeline-St. Landry- Calcasieu-Jefferson Davis-Acadia-Lafayette-Upper St. Martin- Vermilion-Iberia-St. Mary-Lower St. Martin-West Cameron-East Cameron- Tyler-Hardin-Jefferson-Orange-Northern Jasper-Northern Newton- Southern Jasper-Southern Newton- 400 AM CDT Tue Jul 20 2021 This Hazardous Weather Outlook is for central Louisiana, south central Louisiana, southwest Louisiana, west central Louisiana and southeast Texas. .DAY ONE...Today and tonight. Widespread showers and thunderstorms will persist across the area through much of the day. Torrential rainfall associated with these storms could lead to localized flash flooding. Widespread severe weather is not expected. However, some storms will have the potential to produce gusty winds and frequent lightning. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Scattered to numerous showers and thunderstorms are expected through Friday with storms becoming more isolated by next weekend. Widespread severe weather is not expected. However, some storms will have the potential to produce gusty winds, frequent lightning and periods of torrential rainfall. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. GMZ430-432-435-450-452-455-470-472-475-210900- Sabine Lake-Calcasieu Lake-Vermilion Bay- Coastal waters from Cameron LA to High Island TX out 20 NM- Coastal waters from Intracoastal City to Cameron LA out 20 NM- Coastal waters from Lower Atchafalaya River to Intracoastal City LA out 20 NM-Waters from Cameron LA to High Island TX from 20 to 60 NM- Waters from Intracoastal City to Cameron LA from 20 to 60 NM- Waters from Lower Atchafalaya River to Intracoastal City LA from 20 to 60 NM- 400 AM CDT Tue Jul 20 2021 This Hazardous Weather Outlook is for the Gulf of Mexico and the coastal lakes and bays of the Gulf of Mexico. .DAY ONE...Today and tonight. Widespread showers and thunderstorms will persist across the coastal waters through much of the day. Widespread severe weather is not expected. However, some storms will have the potential to produce gusty winds and frequent lightning. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Scattered to at times numerous showers and thunderstorms are expected through the forecast period. Winds and seas will be higher near thunderstorm activity. Widespread severe weather is not expected. However, some storms will have the potential to produce gusty winds, locally higher seas and frequent lightning. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The Lake Charles radar (KLCH), 65 km away, was scanning. The volume nearest the first event began at 16:52 UTC.
1 flash flood. Local standard time, as filed.
Posts from social media indicated numerous streets in and west of Iota flooded and impassable after several inches of rain.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Louisiana in 2021Every state in 2021This day in weather historyWarnings in Louisiana, July 2021
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 974997.