Alert archive / Texas / Special Weather Statements in 2021
Special Weather Statement, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this special weather statement at Jul 11, 2021, 7:21 PM CDT for Houston County, Texas. It was in force for 39 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
- Jul 11, 2021, 7:21 PM CDT (00:21 UTC)
- Expired
- Jul 11, 2021, 8:00 PM CDT
- In force
- 39 min
- Issued by
- NWS Houston/Galveston, TX
County Houston County, TX
The radar
The Shreveport radar (KSHV), 182 km from the middle of the area, began a volume at 00:24 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 |
|---|---|---|---|
| Jul 11, 7:37 PM CDT | HAIL 0.88 | 1 W Grapeland, TX | PEA TO NICKEL SIZED HAIL WAS REPORTED JUST WEST OF GRAPELAND. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Shreveport, LA (KSHV), launched 00:00Z, 0.4 hours before the alert went out and 191 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
- 868 J/kg
- Mixed-layer CIN
- -52 J/kg
- Mixed-layer LCL
- 1186 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 137 m²/s²
- 0-3 km storm-relative helicity
- 163 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 3.5
The text
As transmitted.
379
WWUS84 KHGX 120021
SPSHGX
Special Weather Statement
National Weather Service Houston/Galveston TX
721 PM CDT Sun Jul 11 2021
TXZ163-120100-
Houston TX-
721 PM CDT Sun Jul 11 2021
...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN HOUSTON COUNTY UNTIL
800 PM CDT...
At 719 PM CDT, Doppler radar was tracking a strong thunderstorm 8
miles west of Grapeland, or 14 miles northwest of Crockett, moving
east at 25 to 30 mph.
Pea size hail and winds in excess of 40 mph will be possible with
this storm.
Locations impacted include...
Grapeland and Latexo.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in League City.
&&
LAT...LON 3158 9526 3134 9522 3143 9568 3151 9570
3156 9557 3159 9527
TIME...MOT...LOC 0019Z 260DEG 28KT 3148 9562
$$The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 11, 7:39 PM CDT | Special Weather Statement | HGX | Houston | 51 min |
| Jul 11, 7:58 PM CDT | Special Weather Statement | HGX | Houston | 47 min |
| Jul 12, 8:29 AM CDT | Areal Flood Advisory | HGX | Brazos, Madison | 3 hr |
| Jul 12, 9:03 AM CDT | Areal Flood Advisory | HGX | Walker | 117 min |
| Jul 12, 9:08 AM CDT | Special Weather Statement | HGX | San Jacinto | 37 min |
| Jul 12, 9:36 AM CDT | Special Weather Statement | HGX | San Jacinto | 39 min |
| Jul 12, 10:12 AM CDT | Special Weather Statement | HGX | Liberty, Polk, San Jacinto | 48 min |
| Jul 12, 11:29 AM CDT | Areal Flood Advisory | HGX | Brazos, Madison | 3 hr |
| Jul 12, 11:33 AM CDT | Areal Flood Advisory | HGX | Houston | 3 hr |
| Jul 12, 12:01 PM CDT | Special Weather Statement | HGX | Brazos | 59 min |
| Jul 12, 12:43 PM CDT | Severe Thunderstorm Warning | HGX | Brazos, Burleson | 18 min |
| Jul 12, 1:10 PM CDT | Areal Flood Advisory | HGX | Brazos, Grimes | 110 min |
| Jul 12, 1:21 PM CDT | Tornado Warning | HGX | Montgomery, Walker | 12 min |
| Jul 12, 2:34 PM CDT | Special Weather Statement | HGX | Montgomery, San Jacinto, Waller | 41 min |
| Jul 12, 3:06 PM CDT | Special Weather Statement | HGX | Harris | 39 min |
| Jul 12, 3:43 PM CDT | Special Weather Statement | HGX | Fort Bend, Harris | 47 min |
| Jul 12, 4:31 PM CDT | Special Weather Statement | HGX | Chambers, Fort Bend | 59 min |
Nearby
Special Weather Statements in Texas, 2021Every special weather statement 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.