National Weather Service United States Department of Commerce

June 17-21 Heavy Rainfall and Flash Flooding

  18 June 500 hPa map

500 hPa Standardized Geostrophic Height Anomalies. Image courtesy Dr. Alicia Bentley

 

An upper level low over the western Gulf of Mexico and an upper level ridge centered over the southeastern United States resulted in sustained moisture transport across southeast Texas and southwest Louisiana from 17 - 21 June. Precipitable water values increased to around 2.2", a +2.5 to +3 sigma standardized anomaly.

 

18 June 700 hPa map

 

Precipitable Water Anomalies. Image courtesy Dr. Alicia Bentley

 

The 18 June 12Z KLCH sounding displayed a tall and skinny CAPE profile with a freezing level over 15000 feet. The deep warm cloud layer indicated an atmosphere favorable for convection capable of high precipitation efficiency. Several bands of convection developed and trained over portions of southeast Texas and southwest Louisiana resulting in very heavy rainfall, in excess of 10" in spots, and flash flooding.

 

18 June 12Z Sounding

17-21 June 2018 Rainfall Totals

Total Rainfall Map

While the following rainfall totals are from 17-21 June, many of the listed locations had the majority of the precipitation fall within a 48 hour period. Observations are collected from a variety of sources with varying equipment and exposures. Not all data listed are considered official. We thank all volunteer weather observers for their dedication.

Location Total Source
Port Arthur 5 SW 15.31" ALERT Gauge
Bridge City 1.3 NW 14.59" CoCoRaHS
Sabine Pass 10 NW 14.45" ALERT Gauge
Sabine Pass 12 WNW 14.45" ALERT Gauge
Sabine Pass 9 WSW 14.02" ALERT Gauge
Beaumont-Port Arthur 13.29" ASOS
Vidor 7.2 N 12.55" CoCoRaHS
McFaddin RAWS 12.41" RAWS
Sabine Pass 12 WSW 11.81" ALERT Gauge
Central Gardens 5 NW 11.46" ALERT Gauge
Hamshire 11 SE 10.83" ALERT Gauge
Port Arthur 18 WSW 10.75" ALERT Gauge
Beaumont City 10.67" COOP
Beaumont 3.3 SW 10.64" CoCoRaHS
Beaumont 4 SW 10.36" ALERT Gauge
Fannet 6 NE 10.35" ALERT Gauge
Port Arthur City 10.33" COOP
Fannet 2 SW 10.11" ALERT Gauge
Nederland 7 WSW 9.92" ALERT Gauge
Beaumont 4 S 9.69" ALERT Gauge
Beaumont 2 SW 9.68" ALERT Gauge
Beaumont 1 ENE 9.65" ALERT Gauge
Beaumont 4 WSW 9.56" ALERT Gauge
Lumberton 9.41" COOP
Beaumont 1 NE 9.29" ALERT Gauge
Sabine Pass 8 NW 9.17" ALERT Gauge
Fannett 6 SE 9.13" ALERT Gauge
Beaumont 2 W 9.05" ALERT Gauge
Fannett 1 NE 9.01" ALERT Gauge
Beaumont 3 NE 9.01" ALERT Gauge
Sabine Pass 18 WSW 8.98" ALERT Gauge
Beaumont 2 SE 8.86" ALERT Gauge
Beaumont 1 NW 8.82" ALERT Gauge
Bevil Oaks 5 ENE 8.74" ALERT Gauge
Orange 9 N 8.68" COOP
Beaumont 1.8 SW 8.41" CoCoRaHS
Beaumont 4 NNW 8.27" ALERT Gauge
Beaumont 2 NNW 8.12" ALERT Gauge
Bevil Oaks 4 E 8.11" ALERT Gauge
Port Arthur 9 WSW 8.03" ALERT Gauge
Beaumont Research Center 7.97" COOP
Fannett 5 WNW 7.92" ALERT Gauge
China 17 SSE 7.92" ALERT Gauge
China 5 ESE 7.79" ALERT Gauge
China 2 S 7.72" ALERT Gauge
Beaumont 5 SW 7.68" ALERT Gauge
China 2 E 7.25" ALERT Gauge
Bevil Oaks 2 SE 6.97" ALERT Gauge
Hamshire 5 SSW 6.97" ALERT Gauge
Port Arthur 12 SW 6.96" ALERT Gauge
Kountze 0.0 WSW 6.43" CoCoRaHS
Lake Charles 7 NW 5.81" COOP
Kirbyville 1.5 SE 5.43" CoCoRaHS
Nome 4 NE 5.40" ALERT Gauge
Nome 6 S 4.96" ALERT Gauge
Warren RAWS 4.89" RAWS
Sour Lake 4.89 NNE 4.61" ALERT Gauge
Hackberry 8 SSW 4.60" COOP
Town Bluff Dam 4.52" COOP
Moss Bluff 2 NNW 4.43" COOP
Thicket 4 SE 4.05" ALERT Gauge