Alert archive / Texas / Severe Thunderstorm Watches in 2012
Severe Thunderstorm Watch 337
The Storm Prediction Center issued this severe thunderstorm watch at Jun 1, 2012, 6:22 PM CDT for Jackson County, Oklahoma; 28 counties in Texas. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 1, 2012, 6:22 PM CDT (23:22 UTC)
- Expired
- Jun 2, 2012, 12:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 65 kt
All 29 counties
Jackson County, OK, Bailey County, TX, Baylor County, TX, Briscoe County, TX, Castro County, TX, Childress County, TX, Cochran County, TX, Cottle County, TX, Crosby County, TX, Dickens County, TX, Floyd County, TX, Foard County, TX, Garza County, TX, Hale County, TX, Hall County, TX, Hardeman County, TX, Haskell County, TX, Hockley County, TX, Kent County, TX, King County, TX, Knox County, TX, Lamb County, TX, Lubbock County, TX, Motley County, TX, Parmer County, TX, Stonewall County, TX, Swisher County, TX, Throckmorton County, TX, Wilbarger County, TX
The radar
The Lubbock radar (KLBB), 70 km from the middle of the area, began a volume at 23:23 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
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
5 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 1, 6:47 PM CDT | Severe Thunderstorm Warning | LUB | Briscoe, Swisher | 58 min |
| Jun 1, 7:37 PM CDT | Severe Thunderstorm Warning | LUB | Briscoe, Swisher | 53 min |
| Jun 1, 8:20 PM CDT | Severe Thunderstorm Warning | OUN | Greer, Harmon, Jackson | 40 min |
| Jun 1, 8:25 PM CDT | Severe Thunderstorm Warning | LUB | Briscoe, Floyd, Hale, Swisher | 35 min |
| Jun 1, 8:58 PM CDT | Severe Thunderstorm Warning | OUN | Harmon, Jackson | 28 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
Amarillo Airport, TX (KAMA), launched 12:00Z, 11.4 hours before the alert went out and 110 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1343 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 301 m²/s²
- 0-3 km storm-relative helicity
- 446 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.0
The text
As transmitted, in the capitals the NWS used until 2016.
425
WWUS20 KWNS 012324
SEL7
SPC WW 012324
OKZ000-TXZ000-020500-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 337
NWS STORM PREDICTION CENTER NORMAN OK
625 PM CDT FRI JUN 1 2012
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
FAR SOUTHWEST OKLAHOMA
WEST CENTRAL TEXAS
EFFECTIVE THIS FRIDAY NIGHT FROM 625 PM UNTIL MIDNIGHT CDT.
HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 75
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 105
STATUTE MILES EAST AND WEST OF A LINE FROM 65 MILES NORTH
NORTHEAST OF PLAINVIEW TEXAS TO 60 MILES SOUTHEAST OF LUBBOCK
TEXAS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).
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.
OTHER WATCH INFORMATION...CONTINUE...WW 332...WW 333...WW
334...WW 335...WW 336...
DISCUSSION...INTENSE TSTMS NOW IN THE SRN TX PANHANDLE EXPECTED TO
CONTINUE MOVING/DEVELOPING SSE THROUGH MID EVE GIVEN CURRENT AND
FCST SLY LOW LVL FLOW OVER W TX AND NW MID/UPR LVL WINDS. STEEP LOW
TO MID LVL LAPSE RATES AND PRESENCE OF AMPLE DEEP SHEAR FOR
ORGANIZED STORMS/SUPERCELLS SUGGEST THAT ACTIVITY MAY MERGE INTO A
SMALL COMPLEX OR TWO THAT WOULD EXTEND A RISK FOR DMGG WIND/SVR HAIL
SWD INTO THE TX S PLAINS.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 34030.
...CORFIDISPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 1, 1:53 PM CDT | Mesoscale Discussion | SPC | Beaver, Beckham, Cimarron, Greer, Harmon, Roger Mills and 1 more | 97 min |
| Jun 1, 2:22 PM CDT | Severe Thunderstorm Watch | SPC | Beaver, Beckham, Cimarron, Ellis, Greer, Harmon and 2 more | 8 hr |
| Jun 1, 3:52 PM CDT | Mesoscale Discussion | SPC | Beaver, Beckham, Cimarron, Ellis, Roger Mills, Texas | 53 min |
| Jun 1, 6:03 PM CDT | Mesoscale Discussion | SPC | Beckham, Custer, Dewey, Ellis, Greer, Harmon and 7 more | 117 min |
Nearby
Severe Thunderstorm Watches in Texas, 2012Severe Thunderstorm Watches in Oklahoma, 2012Every severe thunderstorm watch in 2012
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.