Alert archive / Oklahoma / Severe Thunderstorm Watches in 2017
Severe Thunderstorm Watch 97
The Storm Prediction Center issued this severe thunderstorm watch at Mar 28, 2017, 10:21 PM CDT for 25 counties in Oklahoma; 5 counties in Texas. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 28, 2017, 10:21 PM CDT (03:21 UTC)
- Expired
- Mar 29, 2017, 5:00 AM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 30 counties
Carter County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Creek County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Lincoln County, OK, Love County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Okfuskee County, OK, Oklahoma County, OK, Pawnee County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Wichita County, TX, Wilbarger County, TX
The radar
The Norman radar (KTLX), 25 km from the middle of the area, began a volume at 03:21 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
- 5%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 28, 10:29 PM CDT | Flash Flood Warning | OUN | Cleveland, Grady, McClain, Oklahoma | 6 hr |
| Mar 28, 10:29 PM CDT | Severe Thunderstorm Warning | OUN | Noble, Payne | 31 min |
| Mar 28, 10:31 PM CDT | Severe Thunderstorm Warning | TSA | Osage, Pawnee | 44 min |
| Mar 28, 10:40 PM CDT | Severe Thunderstorm Warning | OUN | Wilbarger | 50 min |
| Mar 28, 11:00 PM CDT | Flash Flood Warning | OUN | Comanche, Cotton, Tillman | 3 hr |
| Mar 28, 11:12 PM CDT | Severe Thunderstorm Warning | OUN | Jackson, Tillman | 48 min |
| Mar 28, 11:13 PM CDT | Severe Thunderstorm Warning | OUN | Caddo, Comanche, Cotton, Grady, Stephens | 47 min |
| Mar 29, 12:00 AM CDT | Flash Flood Warning | OUN | Lincoln, Payne | 3 hr |
| Mar 29, 12:18 AM CDT | Flash Flood Warning | OUN | Caddo, Comanche, Grady, Stephens | 117 min |
| Mar 29, 2:12 AM CDT | Flash Flood Warning | TSA | Creek, Osage, Pawnee | 6 hr |
| Mar 29, 2:36 AM CDT | Severe Thunderstorm Warning | OUN | Cleveland, McClain | 24 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 00:00Z, 3.4 hours before the alert went out and 21 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
- 307 J/kg
- Mixed-layer CIN
- -71 J/kg
- Mixed-layer LCL
- 763 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 287 m²/s²
- 0-3 km storm-relative helicity
- 385 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 6.7
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 28, 7:58 PM CDT | Mesoscale Discussion | SPC | Blaine, Caddo, Canadian, Cleveland, Comanche, Cotton and 20 more | 92 min |
| Mar 28, 10:25 PM CDT | Mesoscale Discussion | SPC | Caddo, Canadian, Carter, Cherokee, Cleveland, Coal and 32 more | 65 min |
| Mar 29, 1:21 AM CDT | Mesoscale Discussion | SPC | Atoka, Carter, Coal, Garvin, Hughes, Johnston and 9 more | 84 min |
| Mar 29, 2:54 AM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Choctaw, McCurtain, Marshall, Pushmataha | 96 min |
| Mar 29, 2:51 PM CDT | Mesoscale Discussion | SPC | Adair, Cherokee, Craig, Delaware, Mayes, Nowata and 2 more | 2 hr |
| Mar 29, 4:17 PM CDT | Tornado Watch | SPC | Adair, LeFlore, McCurtain, Sequoyah | 8 hr |
| Mar 29, 6:08 PM CDT | Mesoscale Discussion | SPC | Craig, Ottawa | 97 min |
| Mar 28, 7:45 PM CDT | Mesoscale Discussion | SPC | Armstrong, Briscoe, Carson, Castro, Crosby, Deaf Smith and 9 more | 60 min |
| Mar 28, 9:07 PM CDT | Mesoscale Discussion | SPC | Bandera, Bexar, Blanco, Brown, Burnet, Callahan and 37 more | 23 min |
| Mar 28, 9:28 PM CDT | Severe Thunderstorm Watch | SPC | Atascosa, Bandera, Bell, Bexar, Blanco, Bosque and 78 more | 8 hr |
| Mar 28, 11:58 PM CDT | Mesoscale Discussion | SPC | Anderson, Bastrop, Bell, Bexar, Blanco, Bosque and 29 more | 92 min |
| Mar 29, 8:23 AM CDT | Mesoscale Discussion | SPC | Brazoria, Calhoun, Chambers, Fort Bend, Galveston, Hardin and 12 more | 67 min |
| Mar 29, 1:31 PM CDT | Mesoscale Discussion | SPC | Brazoria, Chambers, Galveston, Hardin, Harris, Jasper and 7 more | 2 hr |
| Mar 29, 2:11 PM CDT | Tornado Watch | SPC | Angelina, Chambers, Galveston, Hardin, Jasper, Jefferson and 6 more | 7 hr |
| Mar 29, 5:50 PM CDT | Mesoscale Discussion | SPC | Jasper, Newton, Orange | 115 min |
Nearby
Severe Thunderstorm Watches in Oklahoma, 2017Severe Thunderstorm Watches in Texas, 2017Every severe thunderstorm watch 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.