Alert archive / Texas / Severe Thunderstorm Watches in 2016
Severe Thunderstorm Watch 97
The Storm Prediction Center issued this severe thunderstorm watch at Apr 18, 2016, 3:21 PM CDT for 13 counties in Texas. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 18, 2016, 3:21 PM CDT (20:21 UTC)
- Expired
- Apr 18, 2016, 11:00 PM CDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
Counties Brooks County, TX, Cameron County, TX, Duval County, TX, Hidalgo County, TX, Jim Hogg County, TX, Jim Wells County, TX, Kenedy County, TX, La Salle County, TX, McMullen County, TX, Starr County, TX, Webb County, TX, Willacy County, TX, Zapata County, TX
The radar
The Corpus Christi radar (KCRP), 144 km from the middle of the area, began a volume at 20:20 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 SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
21 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 18, 3:30 PM CDT | Severe Thunderstorm Warning | CRP | Webb | 45 min |
| Apr 18, 3:55 PM CDT | Tornado Warning | CRP | Webb | 35 min |
| Apr 18, 4:21 PM CDT | Tornado Warning | CRP | Webb | 24 min |
| Apr 18, 4:44 PM CDT | Tornado Warning | CRP | Webb | 31 min |
| Apr 18, 5:05 PM CDT | Severe Thunderstorm Warning | CRP | Jim Wells, Kleberg, Nueces | 40 min |
| Apr 18, 5:15 PM CDT | Severe Thunderstorm Warning | CRP | Webb | 35 min |
| Apr 18, 5:45 PM CDT | Severe Thunderstorm Warning | BRO | Brooks, Jim Hogg | 60 min |
| Apr 18, 5:48 PM CDT | Severe Thunderstorm Warning | BRO | Hidalgo | 57 min |
| Apr 18, 5:51 PM CDT | Severe Thunderstorm Warning | BRO | Starr | 54 min |
| Apr 18, 5:51 PM CDT | Severe Thunderstorm Warning | BRO | Starr | 54 min |
| Apr 18, 6:31 PM CDT | Severe Thunderstorm Warning | BRO | Starr | 29 min |
| Apr 18, 6:47 PM CDT | Severe Thunderstorm Warning | BRO | Hidalgo, Starr | 58 min |
| Apr 18, 7:21 PM CDT | Flash Flood Warning | BRO | Starr | 114 min |
| Apr 18, 7:46 PM CDT | Severe Thunderstorm Warning | BRO | Hidalgo, Starr | 59 min |
| Apr 18, 8:40 PM CDT | Severe Thunderstorm Warning | BRO | Cameron | 1 min |
| Apr 18, 8:45 PM CDT | Severe Thunderstorm Warning | BRO | Cameron | 45 min |
| Apr 18, 9:34 PM CDT | Severe Thunderstorm Warning | BRO | Zapata | 56 min |
| Apr 18, 10:14 PM CDT | Severe Thunderstorm Warning | BRO | Cameron | 31 min |
| Apr 18, 10:14 PM CDT | Severe Thunderstorm Warning | BRO | Zapata | 38 min |
| Apr 18, 10:45 PM CDT | Flash Flood Warning | BRO | Cameron | 2 hr |
| Apr 18, 10:46 PM CDT | Severe Thunderstorm Warning | BRO | Cameron | 44 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Corpus Christi, TX (KCRP), launched 12:00Z, 8.4 hours before the alert went out and 157 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
- 2403 J/kg
- Mixed-layer CIN
- -24 J/kg
- Mixed-layer LCL
- 614 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 60 m²/s²
- 0-3 km storm-relative helicity
- 186 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 3.2
The text
As transmitted.
051
WWUS20 KWNS 182019
SEL7
SPC WW 182019
TXZ000-190400-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 97
NWS STORM PREDICTION CENTER NORMAN OK
320 PM CDT MON APR 18 2016
THE NWS STORM PREDICTION CENTER HAS ISSUED A
* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
SOUTH TEXAS
* EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 320 PM UNTIL
1100 PM CDT.
* PRIMARY THREATS INCLUDE...
SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2
INCHES IN DIAMETER POSSIBLE
SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
SUMMARY...THUNDERSTORMS ARE DEVELOPING ACROSS SOUTH TX IN A VERY
MOIST AND MODERATELY UNSTABLE AIR MASS. A FEW OF THESE STORMS MAY
BECOME SEVERE...CAPABLE OF DAMAGING WINDS AND HAIL THROUGH THE LATE
AFTERNOON AND EVENING HOURS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 45
STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES NORTH
NORTHEAST OF LAREDO TEXAS TO 25 MILES SOUTHEAST OF MCALLEN TEXAS.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU7).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.
&&
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 29030.
...HARTSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 17, 8:21 PM CDT | Mesoscale Discussion | SPC | Starr, Zapata | 84 min |
| Apr 18, 12:02 AM CDT | Mesoscale Discussion | SPC | Harris, Liberty, Montgomery, San Jacinto | 118 min |
| Apr 18, 4:29 AM CDT | Mesoscale Discussion | SPC | Kinney, Medina, Uvalde | 61 min |
| Apr 18, 5:10 AM CDT | Mesoscale Discussion | SPC | Fort Bend, Harris, Liberty | 95 min |
| Apr 18, 12:57 PM CDT | Mesoscale Discussion | SPC | Brooks, Cameron, Dimmit, Duval, Hidalgo, Jim Hogg and 10 more | 2 hr |
| Apr 18, 5:54 PM CDT | Mesoscale Discussion | SPC | Brooks, Cameron, Dimmit, Duval, Hidalgo, Jim Hogg and 10 more | 2 hr |
Nearby
Severe Thunderstorm Watches in Texas, 2016Every severe thunderstorm watch in 2016
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.