A cluster of summer thunderstorms along numerous outflow boundaries delivered damaging wind gusts across portions of southeastern Louisiana.
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 LIX wrote it up.
A cluster of summer thunderstorms along numerous outflow boundaries delivered damaging wind gusts across portions of southeastern Louisiana.
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 New Orleans, LA wrote its last area forecast discussion before the first event at Jul 2, 12:10 PM CST, 35 minutes earlier.
Area Forecast Discussion National Weather Service New Orleans LA 110 PM CDT Thu Jul 2 2020 .AVIATION... VFR to MVFR conditions will prevail for the forecast period. Convection from the north along with typical seabreeze popup storms may also reduce conditions if they pass directly over terminals. Winds could briefly gust up due to storms or outflow boundaries. Otherwise, VCSH or light showers will be more likely going into tomorrow morning. -BL && .PREV DISCUSSION... /issued 336 AM CDT Thu Jul 2 2020/ SHORT TERM... An upper level trough will set up over us for the next few days. This trough will increase rain chances for the area, especially Friday and Saturday. Due to the slow/minimal motion of the trough, the rain that does occur has the chance to produce training rain showers and storms. This setup would allow for the potential for heavy rains/potential flooding for the next few days at least, especially with the ground already being saturated in some locations from afternoon rain showers the last couple days. Another threat could be gusty winds and frequent lightning from these storms as they move through the area, especially with the moisture presence in the atmosphere enhancing the instability. Overall, the main concern for the next few days will be the potential for heavy rainfall from these showers that form. MSW LONG TERM... No significant changes in the extended. Models and ensembles continue to agree with a rather wet pattern remaining in place for the end of the weekend and the first half of next week. Will stick close to the NBM guidance for temps and PoPs. As has been discussed the last few days the trough will be stuck aloft while at the sfc/LL there will be some weak bndry draped over the CWA. Again this will act as a LL focus and with the trough aloft and rich moisture in place, convection will have little problem developing each day if it ever completely dissipates overnight. The problem again is how much rain could we see and with what is being advertised this is not a welcome set up. Models seem to have trended up with the available moisture and not really hinting at drier air working back down into the region from the northwest. PW's will remain near 2" and the K index values will range from 35-40C. This will combine with no shortage of instability and possibly even subtle diffluence aloft at times. All of this would suggest a few bouts of rather efficient rain. It is the Summer and there can be these few events that really overachieve and lead to heavy rain. When everything is said and done it wouldn't be a surprised to see a chunk of the area receive 5 to 7 inches of rain with locally higher amounts possible through the entire event. This will have to be watched over the next 24 to 48 hrs to see if any flash flood watches are needed. /CAB/ AVIATION... VFR conditions will persist for a few more hours but low cigs will begin to develop around 9/10z over much of the area and could lead to MVFR cigs at a few terminals. These should improve a few hours after sunrise and then we should begin to see convection gain between 18-21z mainly east of the I-55 corridor. /CAB/ MARINE... Winds will be westerly and light (<15 knots) through next Wednesday. Wave heights will correspond to wind speeds. MSW && .PRELIMINARY POINT TEMPS/POPS... MCB 74 91 74 90 / 50 80 40 80 BTR 76 93 74 91 / 50 80 50 70 ASD 74 92 74 91 / 50 80 50 80 MSY 77 91 76 90 / 50 80 50 70 GPT 75 89 76 89 / 50 80 50 70 PQL 73 92 74 92 / 50 80 50 80 && .LIX WATCHES/WARNINGS/ADVISORIES... LA...None. GM...None. MS...None. GM...None. &&
The national radar mosaic for the moment the first event began.
2 flash flood, 1 thunderstorm wind. Local standard time, as filed.
Reports of a few streets impassable and water threatening to enter homes. Measured 3.19 inches at a pumping station and 2.62 inches at another station. Most fell within an hour.
Multiple power poles brought down along Highway LA 308 near the Valentine Bridge. Relayed VIA social media.
Two homes had water enter into structures. Measured 5.98 inches at a pumping station between 1130PM and 230PM.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Louisiana in 2020Every state in 2020This day in weather historyWarnings in Louisiana, July 2020
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: 911870, 911868, 911890.