Alert archive / Texas / Special Weather Statements in 2017

Special Weather Statement, NWS Houston/Galveston, TX

May 21, 2017Galveston County, Texas

NWS Houston/Galveston, TX issued this special weather statement at May 21, 2017, 10:49 AM CDT for Galveston County, Texas. It was in force for 41 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
May 21, 2017, 10:49 AM CDT (15:49 UTC)
Expired
May 21, 2017, 11:30 AM CDT
In force
41 min
Issued by
NWS Houston/Galveston, TX

County Galveston County, TX

The radar

The Houston radar (KHGX), 26 km from the middle of the area, began a volume at 15:48 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, 3.8 hours before the alert went out and 179 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 2017-05-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3428 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 2017-05-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 44 square meters per square second.19395878Sfc1 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
3428 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
530 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
44 m²/s²
0-3 km storm-relative helicity
39 m²/s²
Significant tornado parameter
1.7
Supercell composite
6.9

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at May 21, 4:59 AM CDT, 5 hours 50 minutes earlier.

Area forecast discussion, May 21, 4:59 AM CDT, 5 hours 50 minutes before
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Hazardous weather outlook, May 21, 5:43 AM CDT, 5 hours 6 minutes before
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In the hours before

Special weather statement, May 21, 5:04 AM CDT, 5 hours 45 minutes before
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Special weather statement, May 21, 10:49 AM CDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
May 20, 7:29 PM CDTSpecial Weather StatementHGXSan Jacinto46 min
May 20, 7:34 PM CDTSpecial Weather StatementHGXTrinity41 min
May 20, 7:44 PM CDTSevere Thunderstorm WarningHGXHouston, Trinity31 min
May 20, 8:41 PM CDTSpecial Weather StatementHGXHouston19 min
May 20, 11:42 PM CDTSpecial Weather StatementHGXBurleson48 min
May 20, 11:53 PM CDTSevere Thunderstorm WarningHGXBrazos, Burleson37 min
May 21, 12:27 AM CDTSevere Thunderstorm WarningHGXBrazos, Burleson33 min
May 21, 1:00 AM CDTSpecial Weather StatementHGXBrazos, Grimes30 min
May 21, 1:16 AM CDTSevere Thunderstorm WarningHGXBrazos, Burleson, Grimes, Washington29 min
May 21, 1:42 AM CDTSevere Thunderstorm WarningHGXBrazos, Grimes, Montgomery, Walker63 min
May 21, 2:43 AM CDTSevere Thunderstorm WarningHGXMontgomery, Walker47 min
May 21, 3:18 AM CDTSpecial Weather StatementHGXMadison42 min
May 21, 3:25 AM CDTSevere Thunderstorm WarningHGXBrazos, Madison50 min
May 21, 4:14 AM CDTSevere Thunderstorm WarningHGXHouston, Madison, Walker45 min
May 21, 5:04 AM CDTSpecial Weather StatementHGXHouston, Trinity56 min
May 21, 5:27 AM CDTSevere Thunderstorm WarningHGXHouston48 min
May 21, 9:14 AM CDTSpecial Marine WarningHGX91 min
May 21, 9:45 AM CDTAreal Flood AdvisoryHGXHarris60 min
May 21, 9:57 AM CDTSpecial Marine WarningHGX48 min
May 21, 10:44 AM CDTSpecial Marine WarningHGX61 min
May 21, 10:45 AM CDTSpecial Marine WarningHGX60 min
May 21, 11:36 AM CDTSpecial Weather StatementHGXGalveston39 min
May 21, 11:55 AM CDTSpecial Marine WarningHGX2 hr
May 21, 12:11 PM CDTSpecial Weather StatementHGXChambers64 min
May 21, 3:05 PM CDTTornado WarningHGXWaller25 min

Nearby

Special Weather Statements in Texas, 2017Every special weather statement 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.