Alert archive / Texas / Flash Flood Warnings in 2010

Flash Flood Warning 18, NWS Houston/Galveston, TX

July 2, 2010Harris County, Montgomery County, Texas

NWS Houston/Galveston, TX issued this flash flood warning at Jul 2, 2010, 5:22 PM CDT for Harris County, Montgomery 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 counties it named.

The facts

Issued
Jul 2, 2010, 5:22 PM CDT (22:22 UTC)
Expired
Jul 2, 2010, 8:15 PM CDT
In force
3 hr
Issued by
NWS Houston/Galveston, TX
Area
Storm-based polygon
Flood severity
None

Counties Harris County, TX, Montgomery County, TX

The radar

The Houston radar (KHGX), 76 km from the middle of the area, began a volume at 22:25 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

Corpus Christi, TX (KCRP), launched 12:00Z, 10.4 hours before the alert went out and 320 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.

Skew-T log-pSkew-T log-p diagram, Corpus Christi, TX at 12:00Z on 2010-07-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3047 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Corpus Christi, TX at 12:00Z on 2010-07-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 53 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
3047 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
477 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
53 m²/s²
0-3 km storm-relative helicity
68 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood warning 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 warning went out at Jul 2, 3:40 PM CDT, 1 hour 42 minutes earlier.

Area forecast discussion, Jul 2, 3:40 PM CDT, 1 hour 42 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, Jul 2, 10:21 AM CDT, 7 hours 1 minute before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1021 AM CDT FRI JUL 2 2010

TXZ163-164-176>179-195>200-214-030100-
BRAZOS-BURLESON-CHAMBERS-GRIMES-HOUSTON-LIBERTY-MADISON-
MONTGOMERY-POLK-SAN JACINTO-TRINITY-WALKER-WASHINGTON-
1021 AM CDT FRI JUL 2 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS.

.DAY ONE...TODAY AND TONIGHT

WIDESPREAD SHOWERS AND THUNDERSTORMS ARE EXPECTED ACROSS THE AREA
AS A DEEP TROPICAL AIR MASS REMAINS OVER SOUTHEAST TEXAS. SOME OF
THE STRONGER THUNDERSTORMS WILL BE CAPABLE OF PRODUCING LOCALLY
HEAVY RAINS. RAINFALL AMOUNTS SHOULD AVERAGE AROUND AN INCH WITH
SOME HEAVIER TOTALS BETWEEN 1 AND 3 INCHES.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

LINGERING TROPICAL MOISTURE WILL HELP TO KEEP A CHANCE OF RAIN IN
THE FORECAST THROUGH THE WEEKEND FOR SOUTHEAST TEXAS.

.SPOTTER INFORMATION STATEMENT...

EMERGENCY MANAGERS SHOULD PREPARE FOR AREAS OF HEAVY RAIN AND
POSSIBLE FLOODING.

TXZ210>213-226-227-235>238-030100-
AUSTIN-BRAZORIA-COLORADO-FORT BEND-GALVESTON-HARRIS-JACKSON-
MATAGORDA-WALLER-WHARTON-
1021 AM CDT FRI JUL 2 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS.

.DAY ONE...TODAY AND TONIGHT

A VERY MOIST TROPICAL AIR MASS OVER THE AREA AND A WEAK BOUNDARY
DRAPED OVER THE AREA WILL LEAD TO A THREAT OF HEAVY RAINFALL. A
FLOOD WATCH IS IN EFFECT UNTIL NOON FOR THE AREAS MAINLY SOUTH OF
THE I 10 CORRIDOR. AVERAGE ACCUMULATIONS BETWEEN 1 AND 2 INCHES
WITH ISOLATED TOTALS OF 3 TO 5 INCHES CAN BE EXPECTED.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY
AN AREA OF DISTURBED WEATHER IS EXPECTED TO DEVELOP IN THE EASTERN
GULF AND DRIFT WEST POSSIBLY BRING MORE RAINS ON TUESDAY. ANOTHER
AREA OF LOW PRESSURE MAY DEVELOP WITH A TROPICAL WAVE OVER THE
CARIBBEAN ON SUNDAY OR MONDAY.

.SPOTTER INFORMATION STATEMENT...

EMERGENCY MANAGERS SHOULD PREPARE FOR AREAS OF HEAVY RAIN AND
POSSIBLE FLOODING TODAY.

In the hours before

Local storm report, Jul 2, 4:52 PM CDT, 30 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>

The office that day

Everything else NWS Houston/Galveston, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 1, 7:26 PM CDTAreal Flood AdvisoryHGXJackson, Matagorda, Wharton2 hr
Jul 1, 9:05 PM CDTRiver Flood WarningHGXBrazoria, Fort Bend, Wharton20 hr
Jul 1, 10:39 PM CDTAreal Flood AdvisoryHGXBrazoria, Matagorda111 min
Jul 1, 11:43 PM CDTFlash Flood WarningHGXBrazoria3 hr
Jul 1, 11:49 PM CDTAreal Flood AdvisoryHGXMatagorda116 min
Jul 2, 10:19 AM CDTAreal Flood AdvisoryHGXGrimes, Harris, Montgomery, Waller3 hr
Jul 2, 10:39 AM CDTAreal Flood AdvisoryHGXBrazoria, Jackson, Matagorda111 min
Jul 2, 11:36 AM CDTFlash Flood WarningHGXBrazoria114 min
Jul 2, 12:22 PM CDTFlash Flood WarningHGXMatagorda113 min
Jul 2, 12:32 PM CDTAreal Flood AdvisoryHGXHarris118 min
Jul 2, 1:27 PM CDTFlash Flood WarningHGXBrazoria3 hr
Jul 2, 1:47 PM CDTSevere Thunderstorm WarningHGXBrazoria, Fort Bend, Galveston, Harris28 min
Jul 2, 2:14 PM CDTSevere Thunderstorm WarningHGXBrazoria, Fort Bend, Galveston, Harris31 min
Jul 2, 2:17 PM CDTAreal Flood AdvisoryHGXBrazoria, Fort Bend, Harris3 hr
Jul 2, 2:33 PM CDTFlash Flood WarningHGXHarris3 hr
Jul 2, 3:33 PM CDTRiver Flood WarningHGXHarris6 days
Jul 2, 3:33 PM CDTRiver Flood WarningHGXHarris18 hr
Jul 2, 3:39 PM CDTRiver Flood WarningHGXBrazoria, Fort Bend17 hr
Jul 2, 3:54 PM CDTRiver Flood WarningHGXHarris17 hr
Jul 2, 4:32 PM CDTFlash Flood WarningHGXBrazoria, Fort Bend3 hr
Jul 2, 4:53 PM CDTRiver Flood WarningHGXHarris17 hr
Jul 2, 5:23 PM CDTRiver Flood WarningHGXGalveston, Harris6 days
Jul 2, 5:23 PM CDTRiver Flood WarningHGXGalveston, Harris16 hr
Jul 2, 5:42 PM CDTRiver Flood WarningHGXHarris15 hr
Jul 2, 6:24 PM CDTRiver Flood WarningHGXHarris15 hr
Jul 2, 6:30 PM CDTRiver Flood WarningHGXHarris15 hr

Nearby

Flash Flood Warnings in Texas, 2010Every flash flood warning in 2010

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.