Alert archive / Texas / Flash Flood Warnings in 2018
Flash Flood Warning 21, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this flash flood warning at Sep 3, 2018, 7:43 AM CDT for Brazoria County, Chambers County, Galveston County, Texas. It was in force for 8 hr. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Sep 3, 2018, 7:43 AM CDT (12:43 UTC)
- Expired
- Sep 3, 2018, 3:45 PM CDT
- In force
- 8 hr
- Issued by
- NWS Houston/Galveston, TX
- Area
- Storm-based polygon
- Flood severity
- None
Counties Brazoria County, TX, Chambers County, TX, Galveston County, TX
The radar
The Houston radar (KHGX), 43 km from the middle of the area, began a volume at 12:45 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 3, 9:00 AM CDT | FLASH FLOOD | Galveston, TX | NUMEROUS ROADS IMPASSABLE DUE TO HIGH WATER INCLUDING 25TH FROM AVE P TO BROADWAY, FERRY ROAD. HARBORSIDE DR TOWARD UTMB. PORTIONS OF THE STRAND. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 12:00Z, 0.7 hours before the alert went out and 160 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
- 269 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 615 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 58 m²/s²
- 0-3 km storm-relative helicity
- 106 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
502
WGUS54 KHGX 031243
FFWHGX
TXC039-071-167-031545-
/O.NEW.KHGX.FF.W.0021.180903T1243Z-180903T1545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Houston/Galveston TX
743 AM CDT MON SEP 3 2018
The National Weather Service in League City has issued a
* Flash Flood Warning for...
Central Galveston County in southeastern Texas...
Southeastern Chambers County in southeastern Texas...
Southeastern Brazoria County in southeastern Texas...
* Until 1045 AM CDT.
* At 741 AM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Flash flooding is expected to
begin shortly. Almost 9.00 inches of rain has fallen at the gage
at the Galveston Intercoastal Water Way at Highway 124 in Chambers
County in the last 7 hours.
* Some locations that will experience flooding include...
Galveston Causeway, Galveston Island West End, Texas City, La
Marque, Hitchcock, Surfside Beach, Galveston Pier 21, Bayou Vista,
Oyster Creek, Jamaica Beach, Tiki Island, High Island, Scholes
Field, Port Bolivar, Offatts Bayou, Galveston Pleasure Pier,
Pelican Island, Galveston State Park, Crystal Beach and
Schlitterbahn.
LAT...LON 2955 9439 2947 9436 2893 9527 2903 9538
2980 9436 2956 9435
$$3 follow-up statements
050
WGUS74 KHGX 031346
FFSHGX
Flash Flood Statement
National Weather Service Houston/Galveston TX
846 AM CDT MON SEP 3 2018
TXC039-071-167-031545-
/O.CON.KHGX.FF.W.0021.000000T0000Z-180903T1545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Galveston TX-Chambers TX-Brazoria TX-
846 AM CDT MON SEP 3 2018
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1045 AM CDT FOR
CENTRAL GALVESTON...SOUTHEASTERN CHAMBERS AND SOUTHEASTERN BRAZORIA
COUNTIES...
At 845 AM CDT, local law enforcement reported flooded and impassable
roads across Galveston Island. Flash flooding is already occurring.
Some locations that will experience flooding include...
Galveston Causeway, Galveston Island West End, Texas City, La Marque,
Hitchcock, Surfside Beach, Galveston Pier 21, Bayou Vista, Oyster
Creek, Jamaica Beach, Tiki Island, High Island, Scholes Field, Port
Bolivar, Offatts Bayou, Galveston Pleasure Pier, Pelican Island,
Galveston State Park, Crystal Beach and Schlitterbahn.
Additional heavy rainfall is expected in the warned area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.
&&
LAT...LON 2955 9439 2947 9436 2893 9527 2903 9538
2980 9436 2956 9435
$$
11001
WGUS54 KHGX 031518
FFWHGX
TXC039-071-167-031845-
/O.EXT.KHGX.FF.W.0021.000000T0000Z-180903T1845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Houston/Galveston TX
1018 AM CDT MON SEP 3 2018
The National Weather Service in League City has extended the
* Flash Flood Warning for...
Central Galveston County in southeastern Texas...
Southeastern Chambers County in southeastern Texas...
Southeastern Brazoria County in southeastern Texas...
* Until 145 PM CDT.
* At 1017 AM CDT, local law enforcement reported heavy rain across
the warned area. 5 to 10 inches of rain have already fallen. Flash
flooding is already occurring.
* Some locations that will experience flooding include...
Galveston Causeway, Galveston Island West End, Texas City, La
Marque, Hitchcock, Surfside Beach, Galveston Pier 21, Bayou Vista,
Oyster Creek, Jamaica Beach, Tiki Island, High Island, Scholes
Field, Port Bolivar, Offatts Bayou, Galveston Pleasure Pier,
Pelican Island, Galveston State Park, Crystal Beach and
Schlitterbahn.
Additional rainfall amounts of 1 to 3 inches are possible in the
warned area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.
&&
LAT...LON 2955 9439 2947 9436 2893 9527 2903 9538
2980 9436 2956 9435
$$
11033
WGUS54 KHGX 031835
FFWHGX
TXC039-071-167-032045-
/O.EXT.KHGX.FF.W.0021.000000T0000Z-180903T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Houston/Galveston TX
135 PM CDT MON SEP 3 2018
The National Weather Service in League City has extended the
* Flash Flood Warning for...
Central Galveston County in southeastern Texas...
Southeastern Chambers County in southeastern Texas...
Southeastern Brazoria County in southeastern Texas...
* Until 345 PM CDT.
* At 135 PM CDT, local law enforcement reported heavy rain across
the warned area. Many streets on Galveston Island are
impassable. Flash flooding is already occurring.
* Some locations that will experience flooding include...
Galveston Causeway, Galveston Island West End, Texas City, La
Marque, Hitchcock, Surfside Beach, Galveston Pier 21, Bayou Vista,
Oyster Creek, Jamaica Beach, Tiki Island, High Island, Scholes
Field, Port Bolivar, Offatts Bayou, Galveston Pleasure Pier,
Pelican Island, Galveston State Park, Crystal Beach and
Schlitterbahn.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.
&&
LAT...LON 2955 9439 2947 9436 2893 9527 2903 9538
2980 9436 2956 9435
$$
11The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 3, 4:25 AM CDT | Areal Flood Advisory | HGX | Chambers, Galveston | 2 hr |
| Sep 3, 4:55 AM CDT | Flash Flood Warning | HGX | Chambers, Galveston | 3 hr |
| Sep 3, 6:34 AM CDT | Areal Flood Advisory | HGX | Brazoria, Galveston, Matagorda | 116 min |
| Sep 3, 6:52 AM CDT | Areal Flood Advisory | HGX | Galveston | 113 min |
| Sep 3, 7:21 AM CDT | Special Marine Warning | HGX | 39 min | |
| Sep 3, 7:24 AM CDT | Areal Flood Advisory | HGX | Brazoria, Galveston, Harris | 2 hr |
| Sep 3, 7:28 AM CDT | Areal Flood Advisory | HGX | Chambers, Galveston, Harris | 2 hr |
| Sep 3, 7:37 AM CDT | Special Weather Statement | HGX | Brazoria | 38 min |
| Sep 3, 8:25 AM CDT | Flash Flood Warning | HGX | Brazoria, Matagorda | 5 hr |
| Sep 3, 9:09 AM CDT | Areal Flood Advisory | HGX | Harris | 2 hr |
| Sep 3, 9:11 AM CDT | Areal Flood Advisory | HGX | Brazoria, Matagorda | 2 hr |
| Sep 3, 9:13 AM CDT | Areal Flood Advisory | HGX | Chambers, Galveston, Harris, Liberty | 6 hr |
| Sep 3, 9:43 AM CDT | Areal Flood Advisory | HGX | Harris, Liberty, Montgomery | 62 min |
| Sep 3, 9:53 AM CDT | Special Marine Warning | HGX | 37 min | |
| Sep 3, 10:13 AM CDT | Areal Flood Advisory | HGX | Austin, Grimes, Harris, Waller, Washington | 2 hr |
| Sep 3, 10:43 AM CDT | Areal Flood Advisory | HGX | Harris, Montgomery | 2 hr |
| Sep 3, 3:19 PM CDT | Areal Flood Warning | HGX | Brazoria, Chambers, Galveston | 3 hr |
Nearby
Flash Flood Warnings in Texas, 2018Every flash flood warning in 2018
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.