Alert archive / Arkansas / Severe Thunderstorm Watches in 2012
Severe Thunderstorm Watch 130
The Storm Prediction Center issued this severe thunderstorm watch at Apr 2, 2012, 3:49 PM CDT for 25 counties in Arkansas; 20 counties in Oklahoma. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 2, 2012, 3:49 PM CDT (20:49 UTC)
- Expired
- Apr 2, 2012, 7:58 PM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 45 counties
Arkansas County, AR, Conway County, AR, Crawford County, AR, Desha County, AR, Faulkner County, AR, Franklin County, AR, Garland County, AR, Grant County, AR, Hot Spring County, AR, Jefferson County, AR, Johnson County, AR, Lincoln County, AR, Logan County, AR, Lonoke County, AR, Monroe County, AR, Montgomery County, AR, Perry County, AR, Polk County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Sebastian County, AR, Yell County, AR, Atoka County, OK, Bryan County, OK, Carter County, OK, Coal County, OK, Haskell County, OK, Hughes County, OK, Johnston County, OK, Latimer County, OK, LeFlore County, OK, Love County, OK, Marshall County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Okfuskee County, OK, Okmulgee County, OK, Pittsburg County, OK, Pontotoc County, OK, Seminole County, OK, Sequoyah County, OK
The radar
The Western Arkansas radar (KSRX), 41 km from the middle of the area, began a volume at 20:52 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
- 30%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
4 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 2, 4:09 PM CDT | Severe Thunderstorm Warning | LZK | Montgomery, Pike, Polk | 51 min |
| Apr 2, 4:30 PM CDT | Severe Thunderstorm Warning | LZK | Desha, Drew, Lincoln | 30 min |
| Apr 2, 4:53 PM CDT | Severe Thunderstorm Warning | LZK | Polk, Scott | 37 min |
| Apr 2, 5:00 PM CDT | Severe Thunderstorm Warning | LZK | Polk, Scott | 30 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
Springfield, MO (KSGF), launched 12:00Z, 8.8 hours before the alert went out and 227 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
- -391 J/kg
- Mixed-layer LCL
- 1637 m above ground
- 0-6 km bulk shear
- 7 kt
- 0-1 km storm-relative helicity
- 45 m²/s²
- 0-3 km storm-relative helicity
- 146 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 2, 12:15 PM CDT | Mesoscale Discussion | SPC | Ashley, Bradley, Calhoun, Chicot, Clark, Cleveland and 17 more | 90 min |
| Apr 2, 12:41 PM CDT | Severe Thunderstorm Watch | SPC | Bradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 11 more | 6 hr |
| Apr 2, 12:50 PM CDT | Severe Thunderstorm Watch | SPC | Ashley, Chicot | 7 hr |
| Apr 2, 3:18 PM CDT | Mesoscale Discussion | SPC | Ashley, Bradley, Calhoun, Clark, Cleveland, Columbia and 28 more | 117 min |
| Apr 2, 3:23 PM CDT | Mesoscale Discussion | SPC | Ashley, Chicot | 2 hr |
| Apr 2, 5:58 PM CDT | Mesoscale Discussion | SPC | Arkansas, Clark, Cleveland, Conway, Dallas, Desha and 23 more | 62 min |
| Apr 2, 3:00 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Beaver, Beckham, Blaine, Caddo, Canadian and 16 more | 2 hr |
| Apr 2, 3:37 PM CDT | Severe Thunderstorm Watch | SPC | Alfalfa, Beaver, Beckham, Blaine, Caddo, Comanche and 16 more | 7 hr |
Nearby
Severe Thunderstorm Watches in Arkansas, 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.