Alert archive / Texas / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 18, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this severe thunderstorm warning at Apr 9, 2020, 5:00 PM CDT for 9 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, 5:00 PM CDT (22:00 UTC)
- Expired
- Apr 9, 2020, 5:45 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 Austin County, TX, Brazos County, TX, Grimes County, TX, Madison County, TX, Montgomery County, TX, San Jacinto County, TX, Walker County, TX, Waller County, TX, Washington County, TX
The radar
The Houston radar (KHGX), 133 km from the middle of the area, began a volume at 22:01 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.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 9, 2:47 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 12:00Z, 10.0 hours before the alert went out and 262 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.
- Mixed-layer CAPE
- 1181 J/kg
- Mixed-layer CIN
- -205 J/kg
- Mixed-layer LCL
- 1103 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- 1 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 9, 4:42 AM CDT | Marine Dense Fog Advisory | HGX | 4 hr | |
| Apr 9, 3:33 PM CDT | Severe Thunderstorm Warning | HGX | Burleson, Washington | 42 min |
| Apr 9, 3:40 PM CDT | Small Craft Advisory | HGX | 27 hr | |
| Apr 9, 4:15 PM CDT | Severe Thunderstorm Warning | HGX | Brazos, Burleson, Grimes, Washington | 45 min |
| Apr 9, 4:28 PM CDT | Areal Flood Advisory | HGX | Burleson | 2 hr |
| Apr 9, 4:52 PM CDT | Areal Flood Advisory | HGX | Brazos, Burleson, Grimes, Washington | 113 min |
| Apr 9, 5:47 PM CDT | Severe Thunderstorm Warning | HGX | Houston, Liberty, Montgomery, Polk, San Jacinto, Trinity and 1 more | 43 min |
| Apr 9, 5:49 PM CDT | Special Weather Statement | HGX | Harris | 41 min |
| Apr 9, 6:23 PM CDT | Severe Thunderstorm Warning | HGX | Chambers, Harris, Liberty, Montgomery | 37 min |
| Apr 9, 6:29 PM CDT | Special Weather Statement | HGX | Chambers | 46 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.