Alert archive / Texas / Flash Flood Warnings in 2019

Flash Flood Warning 55, NWS Houston/Galveston, TX

September 19, 2019Harris County, Texas

NWS Houston/Galveston, TX issued this flash flood warning at Sep 19, 2019, 10:30 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 counties it named.

The facts

Issued
Sep 19, 2019, 10:30 AM CDT (15:30 UTC)
Expired
Sep 19, 2019, 1:30 PM 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), 52 km from the middle of the area, began a volume at 15:31 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, 3.5 hours before the alert went out and 213 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, Lake Charles Mun, LA at 12:00Z on 2019-09-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 168 joules per kilogram.LCLLFCEL10008507005003002001001 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, Lake Charles Mun, LA at 12:00Z on 2019-09-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 48 square meters per square second.193958Sfc1 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
168 J/kg
Mixed-layer CIN
-35 J/kg
Mixed-layer LCL
1073 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
48 m²/s²
0-3 km storm-relative helicity
235 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 Sep 19, 7:30 AM CDT, 3 hours earlier.

Area forecast discussion, Sep 19, 7:30 AM CDT, 3 hours before
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In the hours before

Local storm report, Sep 19, 9:53 AM CDT, 37 minutes before
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Local storm report, Sep 19, 9:57 AM CDT, 33 minutes before
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Local storm report, Sep 19, 10:11 AM CDT, 19 minutes before
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Local storm report, Sep 19, 10:20 AM CDT, 10 minutes before
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Local storm report, Sep 19, 10:22 AM CDT, 8 minutes before
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      <p id="message2">
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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Local storm report, Sep 19, 10:27 AM CDT, 3 minutes before
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<body>
  <main class="wrap">
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      <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.
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      <p id="message2">
        Please try again in a few minutes.
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      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

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

IssuedProductOfficeCountiesLasted
Sep 18, 7:15 PM CDTFlash Flood WarningHGXChambers, Galveston, Harris60 min
Sep 18, 7:28 PM CDTAreal Flood AdvisoryHGXChambers, Harris, Liberty2 hr
Sep 18, 7:32 PM CDTAreal Flood WarningHGXGalveston3 hr
Sep 18, 7:44 PM CDTFlash Flood WarningHGXChambers, Liberty2 hr
Sep 18, 8:14 PM CDTAreal Flood WarningHGXChambers, Fort Bend, Harris61 min
Sep 18, 9:46 PM CDTFlash Flood WarningHGXChambers, Liberty59 min
Sep 18, 10:41 PM CDTFlash Flood WarningHGXChambers, Liberty64 min
Sep 18, 11:38 PM CDTFlash Flood Warning EmergencyHGXChambers, Liberty8 hr
Sep 19, 12:16 AM CDTAreal Flood AdvisoryHGXHarris, Liberty, Montgomery59 min
Sep 19, 1:24 AM CDTSmall Craft AdvisoryHGX9 hr
Sep 19, 1:28 AM CDTAreal Flood AdvisoryHGXChambers, Harris, Liberty, Montgomery2 hr
Sep 19, 2:20 AM CDTFlash Flood WarningHGXHarris, Liberty, Montgomery115 min
Sep 19, 2:56 AM CDTRiver Flood WarningHGXHarris, Montgomery63 hr
Sep 19, 4:15 AM CDTFlash Flood WarningHGXChambers, Harris, Liberty, Montgomery, San Jacinto3 hr
Sep 19, 4:59 AM CDTFlash Flood Warning EmergencyHGXLiberty2 hr
Sep 19, 5:32 AM CDTFlash Flood WarningHGXMontgomery118 min
Sep 19, 5:44 AM CDTRiver Flood WarningHGXLiberty4 days
Sep 19, 6:04 AM CDTSpecial Weather StatementHGXMontgomery41 min
Sep 19, 6:41 AM CDTTornado WarningHGXChambers21 min
Sep 19, 7:00 AM CDTFlash Flood Warning EmergencyHGXChambers, Liberty, Montgomery, San Jacinto7 hr
Sep 19, 7:18 AM CDTFlash Flood WarningHGXHarris, Liberty, Montgomery4 hr
Sep 19, 7:37 AM CDTSevere Thunderstorm WarningHGXHarris, Liberty, Montgomery38 min
Sep 19, 8:10 AM CDTRiver Flood WarningHGXHarris, Montgomery21 hr
Sep 19, 8:12 AM CDTRiver Flood WarningHGXHarris, Liberty, Montgomery, San Jacinto33 hr
Sep 19, 8:26 AM CDTFlash Flood WarningHGXChambers, Harris, Liberty3 hr
Sep 19, 8:27 AM CDTRiver Flood WarningHGXChambers, Harris, Liberty3 days
Sep 19, 8:33 AM CDTSpecial Marine WarningHGX87 min
Sep 19, 8:50 AM CDTFlash Flood Warning EmergencyHGXChambers, Harris, Liberty, Montgomery5 hr
Sep 19, 9:12 AM CDTFlash Flood WarningHGXHarris, Montgomery3 hr
Sep 19, 9:25 AM CDTSpecial Weather StatementHGXChambers, Harris65 min
Sep 19, 10:02 AM CDTFlash Flood Warning EmergencyHGXHarris118 min
Sep 19, 10:12 AM CDTRiver Flood WarningHGXHarris, Montgomery44 hr
Sep 19, 10:20 AM CDTAreal Flood AdvisoryHGXGalveston115 min
Sep 19, 10:20 AM CDTSmall Craft AdvisoryHGX9 hr
Sep 19, 10:28 AM CDTRiver Flood WarningHGXHarris18 hr
Sep 19, 10:41 AM CDTRiver Flood WarningHGXHarris18 hr
Sep 19, 10:41 AM CDTRiver Flood WarningHGXHarris36 hr
Sep 19, 10:41 AM CDTRiver Flood WarningHGXHarris21 days
Sep 19, 10:46 AM CDTSpecial Marine WarningHGX119 min
Sep 19, 10:47 AM CDTFlash Flood WarningHGXChambers, Galveston31 min
Sep 19, 11:01 AM CDTRiver Flood WarningHGXHarris18 hr
Sep 19, 11:16 AM CDTFlash Flood WarningHGXBrazoria, Chambers, Galveston3 hr
Sep 19, 11:17 AM CDTRiver Flood WarningHGXHarris27 hr
Sep 19, 11:17 AM CDTRiver Flood WarningHGXHarris21 days
Sep 19, 11:38 AM CDTFlash Flood WarningHGXChambers, Harris, Liberty112 min
Sep 19, 11:45 AM CDTRiver Flood WarningHGXHarris17 hr
Sep 19, 11:45 AM CDTRiver Flood WarningHGXHarris21 days
Sep 19, 11:45 AM CDTRiver Flood WarningHGXHarris17 hr
Sep 19, 12:00 PM CDTRiver Flood WarningHGXHarris, Montgomery18 hr
Sep 19, 12:03 PM CDTFlash Flood WarningHGXAustin, Brazoria, Colorado, Fort Bend, Harris, Waller and 1 more3 hr
Sep 19, 12:06 PM CDTRiver Flood WarningHGXHarris4 days
Sep 19, 12:08 PM CDTFlash Flood Warning EmergencyHGXHarris3 hr
Sep 19, 12:13 PM CDTRiver Flood WarningHGXHarris16 hr
Sep 19, 12:13 PM CDTRiver Flood WarningHGXHarris19 hr
Sep 19, 12:23 PM CDTRiver Flood WarningHGXHarris21 days
Sep 19, 12:23 PM CDTRiver Flood WarningHGXHarris21 days
Sep 19, 12:31 PM CDTRiver Flood WarningHGXHarris16 hr
Sep 19, 12:31 PM CDTRiver Flood WarningHGXHarris21 days
Sep 19, 12:31 PM CDTRiver Flood WarningHGXHarris16 hr
Sep 19, 12:43 PM CDTSpecial Marine WarningHGX2 hr
Sep 19, 12:50 PM CDTRiver Flood WarningHGXHarris21 days
Sep 19, 12:56 PM CDTRiver Flood WarningHGXHarris21 days
Sep 19, 1:25 PM CDTFlash Flood WarningHGXBrazoria, Chambers, Fort Bend, Galveston, Harris, Liberty3 hr
Sep 19, 1:27 PM CDTRiver Flood WarningHGXHarris21 days
Sep 19, 1:27 PM CDTRiver Flood WarningHGXHarris21 days
Sep 19, 1:27 PM CDTRiver Flood WarningHGXFort Bend, Harris21 days
Sep 19, 1:27 PM CDTRiver Flood WarningHGXHarris21 days
Sep 19, 1:27 PM CDTRiver Flood WarningHGXHarris21 days
Sep 19, 2:00 PM CDTFlash Flood Warning EmergencyHGXChambers, Harris, Liberty, Montgomery, San Jacinto3 hr
Sep 19, 2:16 PM CDTFlash Flood WarningHGXBrazoria, Chambers, Galveston119 min
Sep 19, 2:54 PM CDTFlash Flood Warning EmergencyHGXHarris111 min
Sep 19, 2:58 PM CDTRiver Flood WarningHGXHarris18 hr
Sep 19, 2:58 PM CDTRiver Flood WarningHGXHarris21 hr
Sep 19, 3:01 PM CDTFlash Flood WarningHGXBrazoria, Fort Bend, Matagorda, Wharton119 min
Sep 19, 3:40 PM CDTRiver Flood WarningHGXHarris31 hr
Sep 19, 3:40 PM CDTRiver Flood WarningHGXHarris21 days
Sep 19, 4:18 PM CDTFlash Flood WarningHGXBrazoria, Chambers, Galveston117 min
Sep 19, 4:27 PM CDTRiver Flood WarningHGXGalveston, Harris13 hr
Sep 19, 4:29 PM CDTRiver Flood WarningHGXAustin, Colorado, Fort Bend, Wharton40 hr
Sep 19, 4:34 PM CDTAreal Flood WarningHGXBrazoria, Chambers, Fort Bend, Galveston, Harris, Liberty and 2 more18 hr

Nearby

Flash Flood Warnings in Texas, 2019Every flash flood warning in 2019

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.