Alert archive / Texas / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 29, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this severe thunderstorm warning at Apr 15, 2021, 5:30 PM CDT for 4 counties in Texas. It was in force for 30 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Apr 15, 2021, 5:30 PM CDT (22:30 UTC)
- Expired
- Apr 15, 2021, 6:00 PM CDT
- In force
- 30 min
- Issued by
- NWS Houston/Galveston, TX
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Austin County, TX, Burleson County, TX, Colorado County, TX, Washington County, TX
The radar
The Ft Hood radar (KGRK), 84 km from the middle of the area, began a volume at 22:32 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 15, 6:05 PM CDT | HAIL 0.25 | 6 Ne Burton, TX |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Corpus Christi, TX (KCRP), launched 12:00Z, 10.5 hours before the alert went out and 285 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
- 3082 J/kg
- Mixed-layer CIN
- -22 J/kg
- Mixed-layer LCL
- 497 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 60 m²/s²
- 0-3 km storm-relative helicity
- 137 m²/s²
- Significant tornado parameter
- 1.6
- Supercell composite
- 7.8
The text
As transmitted.
935
WUUS54 KHGX 152230
SVRHGX
TXC015-051-089-477-152300-
/O.NEW.KHGX.SV.W.0029.210415T2230Z-210415T2300Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Houston/Galveston TX
530 PM CDT Thu Apr 15 2021
The National Weather Service in League City has issued a
* Severe Thunderstorm Warning for...
North central Colorado County in southeastern Texas...
Northwestern Austin County in southeastern Texas...
Southwestern Burleson County in southeastern Texas...
Washington County in southeastern Texas...
* Until 600 PM CDT.
* At 529 PM CDT, a severe thunderstorm was located over Dime Box, or
11 miles northeast of Giddings, moving southeast at 45 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Locations impacted include...
Brenham, Shelby, Somerville, Industry, Burton, Lake Somerville Dam,
Lake Somerville State Park & Trailway, Carmine, Deanville,
Frelsburg, New Ulm and Quarry.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
If on or near Lake Somerville, get away from the water and move
indoors or inside a vehicle. Remember, lightning can strike out to
15 miles from the parent thunderstorm. If you can hear thunder, you
are close enough to be struck by lightning. Move to safe shelter
now! Do not be caught on the water in a thunderstorm.
&&
LAT...LON 3051 9687 3025 9624 2983 9653 2989 9664
2996 9657 3004 9662 3015 9665 3016 9669
3014 9677 3016 9679 3020 9674 3024 9673
3025 9669 3030 9664 3032 9669 3032 9674
3039 9679 3043 9687 3046 9688 3047 9691
TIME...MOT...LOC 2229Z 304DEG 41KT 3033 9684
HAIL...1.00IN
WIND...60MPH
$$The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 14, 7:16 PM CDT | Special Weather Statement | HGX | Liberty | 29 min |
| Apr 14, 7:17 PM CDT | Special Weather Statement | HGX | Chambers | 28 min |
| Apr 14, 8:06 PM CDT | Special Weather Statement | HGX | Chambers | 24 min |
| Apr 14, 8:57 PM CDT | Special Weather Statement | HGX | Jackson | 33 min |
| Apr 14, 9:25 PM CDT | Special Weather Statement | HGX | Fort Bend | 35 min |
| Apr 15, 8:52 AM CDT | Small Craft Advisory | HGX | 10 hr | |
| Apr 15, 4:34 PM CDT | Special Weather Statement | HGX | Burleson | 56 min |
| Apr 15, 5:17 PM CDT | Special Weather Statement | HGX | Brazos, Burleson, Grimes, Washington | 58 min |
| Apr 15, 6:00 PM CDT | Special Weather Statement | HGX | Brazos, Grimes, Montgomery, Walker | 60 min |
| Apr 15, 6:01 PM CDT | Severe Thunderstorm Warning | HGX | Austin, Montgomery, Waller, Washington | 44 min |
| Apr 15, 6:21 PM CDT | Special Weather Statement | HGX | Grimes, Montgomery, San Jacinto, Walker | 54 min |
| Apr 15, 6:46 PM CDT | Special Weather Statement | HGX | Waller | 44 min |
Nearby
Severe Thunderstorm Warnings in Texas, 2021Every severe thunderstorm warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.