Alert archive / Oklahoma / Severe Thunderstorm Watches in 2013
Severe Thunderstorm Watch 68
The Storm Prediction Center issued this severe thunderstorm watch at Mar 30, 2013, 6:06 PM CDT for 20 counties in Oklahoma; 11 counties in Texas. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 30, 2013, 6:06 PM CDT (23:06 UTC)
- Expired
- Mar 31, 2013, 1:00 AM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 60 kt
All 31 counties
Atoka County, OK, Bryan County, OK, Caddo County, OK, Carter County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, Murray County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Clay County, TX, Collin County, TX, Cooke County, TX, Denton County, TX, Fannin County, TX, Grayson County, TX, Hunt County, TX, Jack County, TX, Montague County, TX, Wichita County, TX, Wise County, TX
The radar
The Altus AFB radar (KFDR), 121 km from the middle of the area, began a volume at 23:08 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
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- 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
- 70%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
16 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 30, 6:23 PM CDT | Severe Thunderstorm Warning | OUN | Caddo, Comanche | 37 min |
| Mar 30, 6:25 PM CDT | Severe Thunderstorm Warning | OUN | Comanche | 35 min |
| Mar 30, 6:52 PM CDT | Severe Thunderstorm Warning | OUN | Seminole | 23 min |
| Mar 30, 7:00 PM CDT | Severe Thunderstorm Warning | OUN | Comanche | 60 min |
| Mar 30, 7:05 PM CDT | Severe Thunderstorm Warning | OUN | Pottawatomie, Seminole | 40 min |
| Mar 30, 7:38 PM CDT | Severe Thunderstorm Warning | OUN | Grady | 52 min |
| Mar 30, 7:46 PM CDT | Severe Thunderstorm Warning | OUN | Hughes, Seminole | 44 min |
| Mar 30, 7:52 PM CDT | Severe Thunderstorm Warning | OUN | Cotton | 38 min |
| Mar 30, 8:25 PM CDT | Severe Thunderstorm Warning | OUN | Grady | 50 min |
| Mar 30, 8:28 PM CDT | Severe Thunderstorm Warning | OUN | Hughes, Seminole | 47 min |
| Mar 30, 8:29 PM CDT | Severe Thunderstorm Warning | OUN | Cotton | 46 min |
| Mar 30, 9:10 PM CDT | Severe Thunderstorm Warning | OUN | Hughes | 50 min |
| Mar 30, 9:14 PM CDT | Severe Thunderstorm Warning | OUN | Grady | 46 min |
| Mar 30, 9:59 PM CDT | Severe Thunderstorm Warning | OUN | Atoka, Coal, Hughes | 46 min |
| Mar 30, 10:45 PM CDT | Severe Thunderstorm Warning | OUN | Atoka, Coal, Hughes | 60 min |
| Mar 30, 11:41 PM CDT | Severe Thunderstorm Warning | OUN | Atoka | 64 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
Norman, OK (KOUN), launched 12:00Z, 11.1 hours before the alert went out and 123 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
- 21 J/kg
- Mixed-layer CIN
- -317 J/kg
- Mixed-layer LCL
- 786 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 286 m²/s²
- 0-3 km storm-relative helicity
- 508 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 5.7
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 29, 7:01 PM CDT | Mesoscale Discussion | SPC | Beckham, Blaine, Caddo, Canadian, Comanche, Custer and 15 more | 89 min |
| Mar 29, 9:24 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Cotton, Jefferson, Johnston and 5 more | 96 min |
| Mar 29, 10:30 PM CDT | Severe Thunderstorm Watch | SPC | Atoka, Bryan, Carter, Cotton, Jefferson, Johnston and 2 more | 5 hr |
| Mar 30, 1:21 AM CDT | Mesoscale Discussion | SPC | Bryan | 114 min |
| Mar 30, 10:24 AM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Choctaw, Coal, Haskell, Hughes and 8 more | 96 min |
| Mar 30, 2:21 PM CDT | Mesoscale Discussion | SPC | Choctaw | 84 min |
| Mar 30, 4:53 PM CDT | Mesoscale Discussion | SPC | Beckham, Caddo, Custer, Greer, Harmon, Jackson and 3 more | 97 min |
| Mar 30, 5:41 PM CDT | Mesoscale Discussion | SPC | Ottawa | 94 min |
| Mar 30, 2:33 PM CDT | Severe Thunderstorm Watch | SPC | Bowie, Camp, Cass, Franklin, Gregg, Harrison and 11 more | 3 hr |
| Mar 30, 5:15 PM CDT | Mesoscale Discussion | SPC | Brown, Callahan, Coleman, Comanche, Concho, Eastland and 8 more | 90 min |
| Mar 30, 5:37 PM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Gregg, Harrison, Marion and 7 more | 53 min |
Nearby
Severe Thunderstorm Watches in Oklahoma, 2013Severe Thunderstorm Watches in Texas, 2013Every severe thunderstorm watch in 2013
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.