Alert archive / Texas / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 17, NWS Houston/Galveston, TX

April 9, 20204 counties in Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Apr 9, 2020, 4:15 PM CDT for 4 counties in Texas. It was in force for 45 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Apr 9, 2020, 4:15 PM CDT (21:15 UTC)
Expired
Apr 9, 2020, 5:00 PM CDT
In force
45 min
Issued by
NWS Houston/Galveston, TX
Area
Storm-based polygon
Tornado
Possible
Hail
1.0 in
Wind
70.0 mph

Counties Brazos County, TX, Burleson County, TX, Grimes County, TX, Washington County, TX

The radar

The Ft Hood radar (KGRK), 105 km from the middle of the area, began a volume at 21:16 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 9, 2:47 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 9.3 hours before the alert went out and 277 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, Fort Worth, TX at 12:00Z on 2020-04-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Fort Worth, TX at 12:00Z on 2020-04-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 4 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2843 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
4 m²/s²
0-3 km storm-relative helicity
89 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 9, 4:42 AM CDTMarine Dense Fog AdvisoryHGX4 hr
Apr 9, 3:33 PM CDTSevere Thunderstorm WarningHGXBurleson, Washington42 min
Apr 9, 3:40 PM CDTSmall Craft AdvisoryHGX27 hr
Apr 9, 4:28 PM CDTAreal Flood AdvisoryHGXBurleson2 hr
Apr 9, 4:52 PM CDTAreal Flood AdvisoryHGXBrazos, Burleson, Grimes, Washington113 min
Apr 9, 5:00 PM CDTSevere Thunderstorm WarningHGXAustin, Brazos, Grimes, Madison, Montgomery, San Jacinto and 3 more45 min
Apr 9, 5:47 PM CDTSevere Thunderstorm WarningHGXHouston, Liberty, Montgomery, Polk, San Jacinto, Trinity and 1 more43 min
Apr 9, 5:49 PM CDTSpecial Weather StatementHGXHarris41 min
Apr 9, 6:23 PM CDTSevere Thunderstorm WarningHGXChambers, Harris, Liberty, Montgomery37 min
Apr 9, 6:29 PM CDTSpecial Weather StatementHGXChambers46 min

Nearby

Severe Thunderstorm Warnings in Texas, 2020Every severe thunderstorm warning in 2020

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.