Alert archive / Texas / Flash Flood Warnings in 2017
Flash Flood Warning 21, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this flash flood warning at Jun 24, 2017, 8:07 AM CDT for Harris County, Texas. 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 outline as issued.
The facts
- Issued
- Jun 24, 2017, 8:07 AM CDT (13:07 UTC)
- Expired
- Jun 24, 2017, 11:00 AM CDT
- In force
- 3 hr
- Issued by
- NWS Houston/Galveston, TX
- Area
- Storm-based polygon
- Flood severity
- None
County Harris County, TX
The radar
The Houston radar (KHGX), 51 km from the middle of the area, began a volume at 13:08 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
Lake Charles Mun, LA (KLCH), launched 12:00Z, 1.1 hours before the alert went out and 188 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
- 2946 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 578 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- -25 m²/s²
- 0-3 km storm-relative helicity
- -31 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
972 WGUS54 KHGX 241307 FFWHGX TXC201-241600- /O.NEW.KHGX.FF.W.0021.170624T1307Z-170624T1600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED Flash Flood Warning National Weather Service Houston/Galveston TX 807 AM CDT SAT JUN 24 2017 The National Weather Service in League City has issued a * Flash Flood Warning for... East central Harris County in southeastern Texas... * Until 1100 AM CDT. * At 806 AM CDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Over 4.3 inches of rain has already fallen over southern parts of the Lake Houston area with continued moderate to heavy rain occurring. Flash flooding is expected to begin shortly. * Some locations that will experience flooding include... Lake Houston Dam, Lake Houston and southern Atascocita. PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. && LAT...LON 2996 9512 2989 9509 2987 9516 2994 9519 $$
2 follow-up statements
783 WGUS74 KHGX 241424 FFSHGX Flash Flood Statement National Weather Service Houston/Galveston TX 924 AM CDT SAT JUN 24 2017 TXC201-241600- /O.CON.KHGX.FF.W.0021.000000T0000Z-170624T1600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Harris TX- 924 AM CDT SAT JUN 24 2017 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1100 AM CDT FOR EAST CENTRAL HARRIS COUNTY... At 920 AM CDT, Doppler radar indicated continued precipitation across the warned area. Over 6 inches of rain has already fallen and additional thunderstorms and heavy rain is developing to the south. Flash flooding is expected...especially in and around neighborhoods near the southern tip of Lake Houston. Some locations that will experience flooding include... Lake Houston Dam, Lake Houston and southern Atascocita. PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. && LAT...LON 2996 9512 2989 9509 2987 9516 2994 9519 $$
997 WGUS74 KHGX 241605 FFSHGX Flash Flood Statement National Weather Service Houston/Galveston TX 1105 AM CDT SAT JUN 24 2017 TXC201-241610- /O.EXP.KHGX.FF.W.0021.000000T0000Z-170624T1600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Harris TX- 1105 AM CDT SAT JUN 24 2017 ...THE FLASH FLOOD WARNING FOR EAST CENTRAL HARRIS COUNTY HAS EXPIRED... Rain rates have dropped substantially for the time being...but we will continue to closely monitor the situation. Some roads may still be flooded in the area. Please continue to heed any remaining road closures. LAT...LON 2996 9512 2989 9509 2987 9516 2994 9519 $$
The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 24, 2:17 AM CDT | Beach Hazards Statement | HGX | Brazoria, Chambers, Galveston | 22 hr |
| Jun 24, 7:37 AM CDT | Areal Flood Advisory | HGX | Harris | 113 min |
| Jun 24, 7:50 AM CDT | Areal Flood Advisory | HGX | Austin, Fort Bend, Waller | 55 min |
| Jun 24, 8:23 AM CDT | Areal Flood Advisory | HGX | Grimes, Liberty, Montgomery, Polk, San Jacinto | 112 min |
| Jun 24, 8:45 AM CDT | Areal Flood Advisory | HGX | Chambers, Harris, Liberty | 3 hr |
| Jun 24, 8:56 AM CDT | Areal Flood Advisory | HGX | Austin, Brazoria, Fort Bend, Harris, Waller | 2 hr |
| Jun 24, 9:20 AM CDT | Areal Flood Advisory | HGX | Harris | 3 hr |
| Jun 24, 9:38 AM CDT | Flash Flood Warning | HGX | Harris | 3 hr |
| Jun 24, 9:48 AM CDT | Areal Flood Advisory | HGX | Liberty | 3 hr |
| Jun 24, 10:18 AM CDT | Areal Flood Advisory | HGX | Austin, Colorado, Waller, Wharton | 117 min |
| Jun 24, 10:56 AM CDT | Areal Flood Advisory | HGX | Austin, Fort Bend, Harris, Waller, Wharton | 2 hr |
| Jun 24, 11:18 AM CDT | Areal Flood Advisory | HGX | Colorado, Jackson, Wharton | 57 min |
| Jun 24, 11:55 AM CDT | Flash Flood Warning | HGX | Fort Bend | 2 hr |
| Jun 24, 1:01 PM CDT | Areal Flood Advisory | HGX | Brazos, Burleson, Grimes, Washington | 59 min |
| Jun 24, 2:08 PM CDT | Special Marine Warning | HGX | 52 min |
Nearby
Flash Flood Warnings in Texas, 2017Every flash flood warning in 2017
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.