Alert archive / Texas / Freeze Warnings in 2017

Freeze Warning 1, NWS Houston/Galveston, TX

January 6, 20178 counties in Texas

NWS Houston/Galveston, TX issued this freeze warning at Jan 6, 2017, 11:20 AM CST for 8 counties in Texas. It took effect at Jan 6, 2017, 10:00 PM CST. It was in force for 12 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: Jan 6, 2017, 11:20 AM CST (17:20 UTC)
In effect from: Jan 6, 2017, 10:00 PM CST
Expired: Jan 7, 2017, 10:00 AM CST
In force: 12 hr
Issued by: NWS Houston/Galveston, TX

Counties Brazoria County, TX, Chambers County, TX, Fort Bend County, TX, Galveston County, TX, Harris County, TX, Jackson County, TX, Matagorda County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 54 km from the middle of the area, began a volume at 17:23 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, 5.3 hours before the alert went out and 245 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 628 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 483 m²/s²
0-3 km storm-relative helicity: 764 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this freeze 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 freeze warning went out at Jan 6, 10:54 AM CST, 26 minutes earlier.

Area forecast discussion, Jan 6, 10:54 AM CST, 26 minutes before

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Hazardous weather outlook, Jan 6, 5:35 AM CST, 5 hours 45 minutes before

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In the hours before

Special weather statement, Jan 6, 10:47 AM CST, 33 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
Jan 6, 4:15 AM CST	Gale Warning	HGX		26 hr
Jan 6, 4:15 AM CST	Small Craft Advisory	HGX		41 hr
Jan 6, 4:19 AM CST	Wind Advisory	HGX	Brazoria, Chambers, Galveston, Jackson, Matagorda, Wharton	26 hr
Jan 6, 10:47 AM CST	Special Weather Statement	HGX	Fort Bend, Harris, Liberty	88 min
Jan 6, 11:20 AM CST	Hard Freeze Warning	HGX	Austin, Brazos, Burleson, Colorado, Grimes, Houston and 9 more	23 hr

Nearby

Freeze Warnings in Texas, 2017 Every freeze warning in 2017

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.