Alert archive / Texas / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 112, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this severe thunderstorm warning at May 21, 2017, 4:14 AM CDT for Houston County, Madison County, Walker County, 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
- May 21, 2017, 4:14 AM CDT (09:14 UTC)
- Expired
- May 21, 2017, 4:59 AM CDT
- In force
- 45 min
- Issued by
- NWS Houston/Galveston, TX
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 50.0 mph
Counties Houston County, TX, Madison County, TX, Walker County, TX
The radar
The Ft Hood radar (KGRK), 169 km from the middle of the area, began a volume at 09:14 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
Shreveport, LA (KBAD), launched 00:00Z, 9.2 hours before the alert went out and 242 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
- 1368 J/kg
- Mixed-layer CIN
- -11 J/kg
- Mixed-layer LCL
- 1148 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 115 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.0
What forecasters said that day
The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at May 20, 11:51 PM CDT, 4 hours 23 minutes earlier.
Area forecast discussion, May 20, 11:51 PM CDT, 4 hours 23 minutes before
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</html>Hazardous weather outlook, May 20, 4:04 PM CDT, 12 hours 10 minutes before
Hazardous Weather Outlook National Weather Service Houston/Galveston TX 404 PM CDT Sat May 20 2017 TXZ163-164-176>179-195>200-210>214-226-227-235>238-212115- Austin-Brazoria-Brazos-Burleson-Chambers-Colorado-Fort Bend- Galveston-Grimes-Harris-Houston-Jackson-Liberty-Madison-Matagorda- Montgomery-Polk-San Jacinto-Trinity-Walker-Waller-Washington- Wharton- 404 PM CDT Sat May 20 2017 This hazardous weather outlook is for portions of Southeast Texas.. .DAY ONE...This Afternoon and Tonight Showers and thunderstorms capable of producing locally heavy rainfall will be possible this afternoon and tonight generally north of Interstate 10. Isolated amounts in excess of 2-4 inches may be possible. Additionally, stronger thunderstorms this afternoon may be capable of gusty winds and small hail. .DAYS TWO THROUGH SEVEN...Sunday through Friday Periods of showers and thunderstorms capable of producing locally heavy rainfall will be possible Sunday through Thursday across Southeast Texas. Some of this rainfall may be able to cause minor or flash flooding Monday and Tuesday. Some of these thunderstorms may also be capable of gusty winds or hail. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated at this time. GMZ330-335-350-355-370-375-212115- Coastal waters from Freeport to the Matagorda Ship Channel out 20 NM-Coastal waters from High Island to Freeport out 20 NM- Galveston Bay-Matagorda Bay- Waters from Freeport to the Matagorda Ship Channel from 20 to 60 NM-Waters from High Island to Freeport from 20 to 60 NM- 404 PM CDT Sat May 20 2017 This hazardous weather outlook is for portions of Southeast Texas.. .DAY ONE...This Afternoon and Tonight No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Sunday through Friday Periods of showers and thunderstorms will be possible Sunday through Tuesday ahead of a cold front. Small Craft Advisories may be needed in the wake of the front Tuesday night or Wednesday morning. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated at this time.
In the hours before
Special weather statement, May 20, 11:42 PM CDT, 4 hours 32 minutes before
Special Weather Statement
National Weather Service Houston/Galveston TX
1142 PM CDT SAT MAY 20 2017
TXZ195-196-210530-
Brazos TX-Burleson TX-
1142 PM CDT SAT MAY 20 2017
...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL BURLESON AND WEST CENTRAL
BRAZOS COUNTIES UNTIL 1230 AM CDT...
At 1142 PM CDT, Doppler radar was tracking a strong thunderstorm 7
miles northeast of Tanglewood, or 10 miles west of Caldwell, moving
east at 20 mph.
Half inch hail and winds in excess of 40 mph will be possible with
this storm.
Locations impacted include...
Caldwell and Chriesman.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
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 3073 9662 3073 9660 3071 9660 3070 9657
3072 9652 3044 9648 3045 9688 3046 9688
3046 9690 3047 9691 3049 9690 3050 9691
3051 9690 3053 9691 3056 9696
TIME...MOT...LOC 0442Z 264DEG 19KT 3055 9688
40Special weather statement, May 21, 1:00 AM CDT, 3 hours 14 minutes before
Special Weather Statement
National Weather Service Houston/Galveston TX
100 AM CDT SUN MAY 21 2017
TXZ177-195>199-210630-
Walker TX-Brazos TX-Washington TX-Grimes TX-Burleson TX-
Montgomery TX-
100 AM CDT SUN MAY 21 2017
...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN BURLESON...GRIMES...
NORTH CENTRAL WASHINGTON...BRAZOS...NORTHWESTERN MONTGOMERY AND WEST
CENTRAL WALKER COUNTIES UNTIL 130 AM CDT...
At 100 AM CDT, Doppler radar was tracking a strong thunderstorm near
Millican, or 8 miles southeast of College Station, moving east at 45
mph.
Half inch hail and winds in excess of 40 mph will be possible with
this storm.
Locations impacted include...
College Station, Bryan, Navasota, Snook, Bedias, Millican, Anderson,
Kyle Field, Iola, Wellborn, Roans Prairie, Richards and Carlos.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
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.
This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
LAT...LON 3085 9586 3063 9583 3041 9581 3035 9640
3046 9649 3068 9650
TIME...MOT...LOC 0600Z 254DEG 37KT 3052 9621
40Local storm report, May 21, 1:55 AM CDT, 2 hours 19 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
155 AM CDT SUN MAY 21 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0108 AM TSTM WND DMG 9 NW NAVASOTA 30.46N 96.21W
05/21/2017 BRAZOS TX 911 CALL CENTER
TREE DOWN NEAR THE INTERSECTION OF FM-159 AND MATT
WRIGHT ROAD.
&&
EVENT NUMBER HGX1700205
40Special weather statement, May 21, 3:18 AM CDT, 56 minutes before
Special Weather Statement
National Weather Service Houston/Galveston TX
318 AM CDT SUN MAY 21 2017
TXZ176-196-210900-
Madison TX-Brazos TX-
318 AM CDT SUN MAY 21 2017
...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN BRAZOS AND WESTERN
MADISON COUNTIES UNTIL 400 AM CDT...
At 318 AM CDT, Doppler radar was tracking a strong thunderstorm 10
miles north of Kurten, or 19 miles north of Bryan, moving east at 15
mph.
Dime size hail and winds in excess of 40 mph will be possible with
this storm.
Locations impacted include...
Normangee and North Zulch.
LAT...LON 3085 9598 3086 9636 3090 9636 3092 9634
3097 9626 3100 9617 3107 9605
TIME...MOT...LOC 0818Z 256DEG 14KT 3094 9627The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 7:29 PM CDT | Special Weather Statement | HGX | San Jacinto | 46 min |
| May 20, 7:34 PM CDT | Special Weather Statement | HGX | Trinity | 41 min |
| May 20, 7:44 PM CDT | Severe Thunderstorm Warning | HGX | Houston, Trinity | 31 min |
| May 20, 8:41 PM CDT | Special Weather Statement | HGX | Houston | 19 min |
| May 20, 11:42 PM CDT | Special Weather Statement | HGX | Burleson | 48 min |
| May 20, 11:53 PM CDT | Severe Thunderstorm Warning | HGX | Brazos, Burleson | 37 min |
| May 21, 12:27 AM CDT | Severe Thunderstorm Warning | HGX | Brazos, Burleson | 33 min |
| May 21, 1:00 AM CDT | Special Weather Statement | HGX | Brazos, Grimes | 30 min |
| May 21, 1:16 AM CDT | Severe Thunderstorm Warning | HGX | Brazos, Burleson, Grimes, Washington | 29 min |
| May 21, 1:42 AM CDT | Severe Thunderstorm Warning | HGX | Brazos, Grimes, Montgomery, Walker | 63 min |
| May 21, 2:43 AM CDT | Severe Thunderstorm Warning | HGX | Montgomery, Walker | 47 min |
| May 21, 3:18 AM CDT | Special Weather Statement | HGX | Madison | 42 min |
| May 21, 3:25 AM CDT | Severe Thunderstorm Warning | HGX | Brazos, Madison | 50 min |
| May 21, 5:04 AM CDT | Special Weather Statement | HGX | Houston, Trinity | 56 min |
| May 21, 5:27 AM CDT | Severe Thunderstorm Warning | HGX | Houston | 48 min |
| May 21, 9:14 AM CDT | Special Marine Warning | HGX | 91 min | |
| May 21, 9:45 AM CDT | Areal Flood Advisory | HGX | Harris | 60 min |
| May 21, 9:57 AM CDT | Special Marine Warning | HGX | 48 min | |
| May 21, 10:44 AM CDT | Special Marine Warning | HGX | 61 min | |
| May 21, 10:45 AM CDT | Special Marine Warning | HGX | 60 min | |
| May 21, 10:49 AM CDT | Special Weather Statement | HGX | Galveston | 41 min |
| May 21, 11:36 AM CDT | Special Weather Statement | HGX | Galveston | 39 min |
| May 21, 11:55 AM CDT | Special Marine Warning | HGX | 2 hr | |
| May 21, 12:11 PM CDT | Special Weather Statement | HGX | Chambers | 64 min |
| May 21, 3:05 PM CDT | Tornado Warning | HGX | Waller | 25 min |
Nearby
Severe Thunderstorm Warnings in Texas, 2017Every severe thunderstorm warning 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.