An upper level trough and ample surface moisture created numerous thunderstorms over Southeast Texas. One location experienced flooding.
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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.
An upper level trough and ample surface moisture created numerous thunderstorms over Southeast Texas. One location experienced flooding.
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 Aug 7, 8:46 AM CST, 2 hours 28 minutes earlier.
Area Forecast Discussion National Weather Service Lake Charles LA 946 AM CDT Mon Aug 7 2017 .UPDATE...Scattered showers and storms are ongoing this morning with an outflow boundary from an MCSs over NE TX drifting into SE TX and nocturnal convection drifting in from the gulf. With no cap this morning convection will likely continue into the afternoon, especially with the outflow boundary moving in. Pops were increased to reflect this over SE TX and W LA and high temps were decreased a bit. Hi Res models also indicate some locations may get heavy rain that could lead to street flooding, but mainly from AEX to LCH and BPT. && .PREV DISCUSSION... /issued 632 AM CDT Mon Aug 7 2017/ DISCUSSION... For the 07/12Z TAF issuance. AVIATION... Nocturnal shower activity has developed overnight in the deep moist air mass. This activity will continue to affect southern TAF sites through about 07/15Z before it begins to dissipate. Showers and storms will redevelop later this afternoon as daytime heating creates a instability to go along with a very moist airmass and upper level trough. Activity will then decrease with the loss of daytime heating after 08/01Z. Rua PREV DISCUSSION... /issued 429 AM CDT Mon Aug 7 2017/ DISCUSSION... This morning's satellite and area radar imagery show several areas of thunderstorms ongoing across portions of central and northeast Texas in association with two mesoscale convective complexes that developed during the overnight hours. Additionally, thunderstorms have begun developing over the Gulf of Mexico and are progressing to the north and northeast. Abundant deep layer moisture and a broad upper level trough have resulted in an environment that has supported the development or continuation of convection this morning. This environment is forecast to remain in place today and Tuesday before an upper level ridge begins to build eastward during the day on Wednesday. For today, the best rainfall chances will begin along the coast in association with convection over the Gulf of Mexico moving inland. By mid-morning into the afternoon, the remains of the thunderstorm complexes over Texas are forecast to approach the region and will likely trigger the development of additional thunderstorms across the region. Some of the model solutions indicate that the convection that develops this afternoon could consolidate into a new convective complex that will progress across central Louisiana during the overnight hours into the early morning on Tuesday. The entire process would then be repeated on Tuesday with new areas of showers and thunderstorms developing in the afternoon. Overall rainfall totals are forecast to range from one to three inches across the region through Wednesday morning. However, with PWAT values exceeding two inches across the region, rainfall totals closer to five or six inches will certainly be possible in isolated locations. An upper level ridge is forecast to begin building eastward during the second half of the week. This will result in the weather pattern gradually trending toward one more typical of August with chances for afternoon showers and thunderstorms each day. Temperatures will also begin to return toward normal with highs in the low to mid 90s by the weekend. MARINE... An upper level system will result in periods of showers and thunderstorms over the coastal waters through Tuesday night before exiting the region. Showers and thunderstorms will be far less widespread but still possible during the second half of the week. Weak onshore flow is expected throughout much of the week. While Tropical Storm Franklin is forecast to remain well south of the region, it could result in a slight increase in winds and waves offshore during the middle part of the week as it progresses across the Bay of Campeche. && .PRELIMINARY POINT TEMPS/POPS... AEX 86 73 83 73 / 80 80 70 40 LCH 86 76 87 76 / 70 60 60 50 LFT 88 76 88 76 / 60 40 60 40 BPT 86 76 87 75 / 70 70 60 50 && .LCH WATCHES/WARNINGS/ADVISORIES... LA...None. TX...None. GM...None. && PUBLIC...05
Hazardous Weather Outlook National Weather Service Lake Charles LA 441 AM CDT Mon Aug 7 2017 LAZ027>033-041>045-052>055-073-074-TXZ180-201-215-216-259>262- 080945- 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- 441 AM CDT Mon Aug 7 2017 This Hazardous Weather Outlook is for portions of central Louisiana, south central Louisiana, southwest Louisiana, west central Louisiana, and southeast Texas. .DAY ONE...Today and Tonight Showers and thunderstorms are expected across much of the area today. Some of the stronger thunderstorms could produce locally heavy rainfall and gusty winds in addition to frequent lightning. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Showers and thunderstorms will be possible each day Tuesday through Sunday. The environment will continue to be favorable for locally heavy rainfall during the day on Tuesday. Some of the stronger thunderstorms may also produce gusty winds in addition to frequent lightning. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. GMZ430-432-435-450-452-455-470-472-475-080945- 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- 441 AM CDT Mon Aug 7 2017 This Hazardous Weather Outlook is for portions of Gulf of Mexico. .DAY ONE...Today and Tonight Showers and thunderstorms will be possible today and tonight over the coastal waters. Some of the stronger thunderstorms could result in gusty winds, locally higher seas, frequent lightning. One or two waterspouts may also be possible. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Showers and thunderstorms will be possible during the late night through the early morning hours each day Tuesday through Sunday. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The Houston radar (KHGX), 99 km away, was scanning. The volume nearest the first event began at 17:13 UTC.
1 flash flood. Local standard time, as filed.
Law enforcement reported water over Old Sour Lake Road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Texas in 2017Every state in 2017This day in weather historyWarnings in Texas, August 2017
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: 718140.