Alert archive / Arkansas / Tornado Watches in 2009

Tornado Watch 125

April 9, 200945 counties in Arkansas; 12 counties in Missouri

The Storm Prediction Center issued this tornado watch at Apr 9, 2009, 7:21 PM CDT for 45 counties in Arkansas; 12 counties in Missouri. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Apr 9, 2009, 7:21 PM CDT (00:21 UTC)
Expired: Apr 10, 2009, 12:38 AM CDT
In force: 5 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 57 counties

Arkansas County, AR, Baxter County, AR, Boone County, AR, Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleburne County, AR, Cleveland County, AR, Conway County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Faulkner County, AR, Fulton County, AR, Garland County, AR, Grant County, AR, Hot Spring County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Jefferson County, AR, Johnson County, AR, Lincoln County, AR, Logan County, AR, Lonoke County, AR, Marion County, AR, Monroe County, AR, Montgomery County, AR, Newton County, AR, Ouachita County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Searcy County, AR, Sharp County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Christian County, MO, Douglas County, MO, Greene County, MO, Howell County, MO, Oregon County, MO, Ozark County, MO, Shannon County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Webster County, MO, Wright County, MO

The radar

The Springfield radar (KSGF), 140 km from the middle of the area, began a volume at 00:22 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: 50%
One or more EF2 to EF5 tornadoes: 30%
Ten or more severe wind reports: 50%
One or more gusts of 65 knots or more: 30%
Ten or more severe hail reports: 60%
One or more hailstones of 2 inches or more: 30%
Six or more combined severe hail and wind reports: 80%

Warnings issued inside it

39 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Apr 9, 7:24 PM CDT	Tornado Warning	LZK	Polk, Scott	66 min
Apr 9, 7:44 PM CDT	Severe Thunderstorm Warning	LZK	Boone, Johnson, Logan, Marion, Newton, Pope and 3 more	61 min
Apr 9, 7:44 PM CDT	Severe Thunderstorm Warning	SGF	Cedar, Dade, Greene, Lawrence, Polk	61 min
Apr 9, 7:53 PM CDT	Severe Thunderstorm Warning	SGF	Barry, Christian, Greene, Lawrence, Stone, Webster	52 min
Apr 9, 8:00 PM CDT	Tornado Warning	LZK	Polk	45 min
Apr 9, 8:01 PM CDT	Tornado Warning	SGF	Dade, Greene, Lawrence	21 min
Apr 9, 8:07 PM CDT	Severe Thunderstorm Warning	SGF	Stone, Taney	53 min
Apr 9, 8:19 PM CDT	Tornado Warning	SGF	Dallas, Greene, Polk	26 min
Apr 9, 8:22 PM CDT	Severe Thunderstorm Warning	LZK	Conway, Garland, Montgomery, Perry, Saline, Yell	38 min
Apr 9, 8:24 PM CDT	Tornado Warning	SGF	Christian, Greene, Webster	51 min
Apr 9, 8:25 PM CDT	Tornado Warning	LZK	Montgomery, Polk, Scott, Yell	35 min
Apr 9, 8:35 PM CDT	Tornado Warning	LZK	Clark, Pike	40 min
Apr 9, 8:35 PM CDT	Severe Thunderstorm Warning	SGF	Douglas, Ozark, Taney	55 min
Apr 9, 8:37 PM CDT	Tornado Warning	SGF	Dallas, Greene, Webster	38 min
Apr 9, 8:42 PM CDT	Tornado Warning	LZK	Montgomery, Pike	48 min
Apr 9, 8:42 PM CDT	Severe Thunderstorm Warning	SGF	Christian, Dallas, Douglas, Greene, Laclede, Webster and 1 more	63 min
Apr 9, 8:46 PM CDT	Severe Thunderstorm Warning	LZK	Baxter, Boone, Conway, Johnson, Logan, Marion and 6 more	44 min
Apr 9, 8:46 PM CDT	Tornado Warning	SGF	Webster, Wright	27 min
Apr 9, 8:54 PM CDT	Tornado Warning	SGF	Douglas, Ozark	51 min
Apr 9, 8:56 PM CDT	Tornado Warning	LZK	Garland, Montgomery, Perry, Yell	22 min
Apr 9, 9:02 PM CDT	Tornado Warning	SGF	Ozark	43 min
Apr 9, 9:03 PM CDT	Severe Thunderstorm Warning	LZK	Conway, Garland, Perry, Saline, Yell	42 min
Apr 9, 9:05 PM CDT	Tornado Warning	SGF	Wright	40 min
Apr 9, 9:06 PM CDT	Tornado Warning	LZK	Garland, Hot Spring, Montgomery	54 min
Apr 9, 9:07 PM CDT	Tornado Warning	SGF	Laclede, Webster	25 min
Apr 9, 9:15 PM CDT	Tornado Warning	LZK	Clark, Garland, Hot Spring, Montgomery, Pike	45 min
Apr 9, 9:19 PM CDT	Severe Thunderstorm Warning	SGF	Camden, Douglas, Howell, Laclede, Ozark, Phelps and 3 more	56 min
Apr 9, 9:28 PM CDT	Severe Thunderstorm Warning	LZK	Baxter, Cleburne, Conway, Faulkner, Fulton, Garland and 13 more	47 min
Apr 9, 9:35 PM CDT	Tornado Warning	SGF	Douglas, Howell	45 min
Apr 9, 9:41 PM CDT	Tornado Warning	SGF	Howell, Ozark	49 min
Apr 9, 10:01 PM CDT	Tornado Warning	LZK	Garland, Grant, Hot Spring, Saline	44 min
Apr 9, 10:03 PM CDT	Severe Thunderstorm Warning	SGF	Dent, Maries, Oregon, Phelps, Shannon	72 min
Apr 9, 10:14 PM CDT	Severe Thunderstorm Warning	LZK	Cleburne, Faulkner, Fulton, Independence, Izard, Jackson and 7 more	61 min
Apr 9, 10:32 PM CDT	Tornado Warning	LZK	Grant, Hot Spring, Saline	21 min
Apr 9, 10:45 PM CDT	Severe Thunderstorm Warning	LZK	Grant, Hot Spring, Jefferson, Lonoke, Pulaski, Saline	49 min
Apr 9, 11:10 PM CDT	Severe Thunderstorm Warning	LZK	Jackson, Woodruff	35 min
Apr 9, 11:16 PM CDT	Severe Thunderstorm Warning	LZK	Jefferson, Lonoke, Prairie, Pulaski, White, Woodruff	44 min
Apr 9, 11:21 PM CDT	Severe Thunderstorm Warning	LZK	Arkansas, Desha, Drew, Lincoln	39 min
Apr 9, 11:58 PM CDT	Severe Thunderstorm Warning	LZK	Monroe, Prairie, Woodruff	32 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 00:00Z, 0.4 hours before the alert went out and 132 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 124 J/kg
Mixed-layer CIN: -201 J/kg
Mixed-layer LCL: 561 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 440 m²/s²
0-3 km storm-relative helicity: 474 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 9, 8:44 PM CDT	Mesoscale Discussion	SPC	Arkansas, Baxter, Boone, Bradley, Calhoun, Clark and 40 more	61 min
Apr 9, 9:10 PM CDT	Tornado Watch	SPC	Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more	4 hr
Apr 9, 9:43 PM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Baxter, Bradley, Calhoun, Chicot and 51 more	2 hr
Apr 9, 10:48 PM CDT	Tornado Watch	SPC	Ashley, Chicot, Clay, Craighead, Crittenden, Cross and 8 more	4 hr
Apr 9, 11:47 PM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Desha, Drew, Jefferson, Lincoln and 3 more	58 min
Apr 9, 10:52 PM CDT	Severe Thunderstorm Watch	SPC	Bollinger, Butler, Cape Girardeau, Carter, Crawford, Iron and 12 more	4 hr
Apr 10, 12:50 AM CDT	Mesoscale Discussion	SPC	Cape Girardeau, Mississippi, New Madrid, Perry, Scott	85 min

Nearby

Tornado Watches in Arkansas, 2009 Tornado Watches in Missouri, 2009 Every tornado watch in 2009

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.