Alert archive / Texas / Flash Flood Warnings in 2015

Flash Flood Warning 104, NWS Houston/Galveston, TX

June 18, 20158 counties in Texas

NWS Houston/Galveston, TX issued this flash flood warning at Jun 18, 2015, 6:30 AM CDT for 8 counties in 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: Jun 18, 2015, 6:30 AM CDT (11:30 UTC)
Expired: Jun 18, 2015, 9:30 AM CDT
In force: 3 hr
Issued by: NWS Houston/Galveston, TX
Area: Storm-based polygon
Flood severity: None

Counties Grimes County, TX, Houston County, TX, Madison County, TX, Montgomery County, TX, Polk County, TX, San Jacinto County, TX, Trinity County, TX, Walker County, TX

The radar

The Houston radar (KHGX), 151 km from the middle of the area, began a volume at 11:33 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 00:00Z, 11.5 hours before the alert went out and 228 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2151 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 678 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 229 m²/s²
0-3 km storm-relative helicity: 249 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 8.5

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 Jun 18, 4:18 AM CDT, 2 hours 12 minutes earlier.

Area forecast discussion, Jun 18, 4:18 AM CDT, 2 hours 12 minutes before

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Hazardous weather outlook, Jun 18, 6:17 AM CDT, 13 minutes before

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In the hours before

Local storm report, Jun 18, 4:55 AM CDT, 1 hour 35 minutes before

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Local storm report, Jun 18, 5:00 AM CDT, 1 hour 30 minutes before

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Local storm report, Jun 18, 5:36 AM CDT, 54 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 17, 7:15 PM CDT	Areal Flood Warning	HGX	Colorado, Jackson, Matagorda, Wharton	15 hr
Jun 17, 9:52 PM CDT	River Flood Warning	HGX	Liberty, Polk	55 hr
Jun 18, 1:46 AM CDT	Areal Flood Advisory	HGX	Grimes, Montgomery, Waller, Washington	119 min
Jun 18, 2:36 AM CDT	Flash Flood Warning	HGX	Grimes, Montgomery, Walker, Waller	4 hr
Jun 18, 3:34 AM CDT	Areal Flood Advisory	HGX	Houston, Madison, Polk, San Jacinto, Trinity, Walker	3 hr
Jun 18, 3:51 AM CDT	Flash Flood Warning	HGX	Houston, Madison, San Jacinto, Trinity, Walker	3 hr
Jun 18, 4:47 AM CDT	Areal Flood Advisory	HGX	Austin, Brazos, Burleson, Colorado, Grimes, Washington	118 min
Jun 18, 6:48 AM CDT	Areal Flood Warning	HGX	Brazos, Grimes, Montgomery, Waller, Washington	3 hr
Jun 18, 7:56 AM CDT	Special Weather Statement	HGX	Houston, Polk, San Jacinto, Trinity	49 min
Jun 18, 9:42 AM CDT	Areal Flood Warning	HGX	Grimes, Houston, Madison, Montgomery, San Jacinto, Trinity and 1 more	6 hr
Jun 18, 1:01 PM CDT	Areal Flood Advisory	HGX	Harris, Montgomery	59 min
Jun 18, 1:57 PM CDT	Areal Flood Advisory	HGX	Harris, Liberty, Montgomery, Polk, San Jacinto, Trinity and 1 more	108 min
Jun 18, 2:20 PM CDT	River Flood Warning	HGX	Harris, Waller	3 days
Jun 18, 4:10 PM CDT	River Flood Warning	HGX	Madison, Walker	48 hr

Nearby

Flash Flood Warnings in Texas, 2015 Every flash flood warning in 2015

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.