Alert archive / Texas / Flash Flood Watches in 2018
Flash Flood Watch 9, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this flash flood watch at Sep 12, 2018, 3:06 PM CDT for 9 counties in Texas. It took effect at Sep 13, 2018, 12:00 AM CDT. It was in force for 52 hr.
The area
The counties it named.
The facts
- Issued
- Sep 12, 2018, 3:06 PM CDT (20:06 UTC)
- In effect from
- Sep 13, 2018, 12:00 AM CDT
- Expired
- Sep 15, 2018, 4:00 AM CDT
- In force
- 52 hr
- Issued by
- NWS Houston/Galveston, TX
- Flood severity
- None
Counties Brazoria County, TX, Chambers County, TX, Fort Bend County, TX, Galveston County, TX, Harris County, TX, Jackson County, TX, Liberty County, TX, Matagorda County, TX, Wharton County, TX
The radar
The Houston radar (KHGX), 43 km from the middle of the area, began a volume at 20:09 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, 8.1 hours before the alert went out and 237 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
- 711 J/kg
- Mixed-layer CIN
- -41 J/kg
- Mixed-layer LCL
- 748 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- 29 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Houston/Galveston, TX wrote its last area forecast discussion before this flash flood watch went out at Sep 12, 12:34 PM CDT, 2 hours 32 minutes earlier.
Area forecast discussion, Sep 12, 12:34 PM CDT, 2 hours 32 minutes before
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html>Hazardous weather outlook, Sep 12, 3:39 AM CDT, 11 hours 27 minutes before
Hazardous Weather Outlook National Weather Service Houston/Galveston TX 339 AM CDT Wed Sep 12 2018 TXZ163-164-176>179-195>200-210>214-226-227-235>238-300-313- 335>338-436>438-131200- Austin-Brazoria Islands-Brazos-Burleson-Chambers-Coastal Brazoria- Coastal Galveston-Coastal Harris-Coastal Jackson- Coastal Matagorda-Colorado-Fort Bend- Galveston Island and Bolivar Peninsula-Grimes-Houston- Inland Brazoria-Inland Galveston-Inland Harris-Inland Jackson- Inland Matagorda-Madison-Matagorda Islands-Montgomery- Northern Liberty-Polk-San Jacinto-Southern Liberty-Trinity-Walker- Waller-Washington-Wharton- 339 AM CDT Wed Sep 12 2018 This hazardous weather outlook is for portions of Southeast Texas. .DAY ONE...Today and Tonight Scattered to numerous showers and thunderstorms are possible, especially close to the coast. Locally heavy rainfall is possible, and flooding could develop if the heaviest rains fall over already saturated grounds. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday Scattered to numerous showers and thunderstorms will remain possible through Saturday as a tropical disturbance moves inland along the Texas coast. Locally heavy rainfall is possible, and flooding could develop if the heaviest rains fall over already saturated grounds. .SPOTTER INFORMATION STATEMENT... Spotters activation might be needed. GMZ330-335-350-355-370-375-131200- Coastal waters from Freeport to Matagorda Ship Channel TX out 20 NM-Coastal waters from High Island to Freeport TX out 20 NM- Galveston Bay-Matagorda Bay- Waters from Freeport to Matagorda Ship Channel TX from 20 to 60 NM-Waters from High Island to Freeport TX from 20 to 60 NM- 339 AM CDT Wed Sep 12 2018 This hazardous weather outlook is for portions of Southeast Texas. .DAY ONE...Today and Tonight Expect increasing winds and building seas. Higher winds and seas as well as reduced visibilities in heavy rains can be expected in any strong shower or thunderstorm activity. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday As a tropical disturbance progresses toward the Texas coast through the end of the week, expect strengthening winds along with building seas and swells. Mariners are urged to keep up with the latest forecasts, as they will be subject to significant changes and dependent on the eventual evolution of this system. .SPOTTER INFORMATION STATEMENT... Spotters activation might be needed.
The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 12, 6:03 AM CDT | Areal Flood Advisory | HGX | Galveston, Harris | 117 min |
| Sep 12, 6:27 AM CDT | Flash Flood Warning | HGX | Galveston, Harris | 2 hr |
| Sep 12, 7:30 AM CDT | Areal Flood Advisory | HGX | Harris | 60 min |
| Sep 12, 8:29 AM CDT | Flash Flood Warning | HGX | Galveston, Harris | 3 hr |
Nearby
Flash Flood Watches in Texas, 2018Every flash flood watch 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.