Alert archive / Colorado / Tornado Watches in 2023

Tornado Watch 419

June 29, 202313 counties in Colorado; 8 counties in Nebraska; 6 counties in Wyoming

The Storm Prediction Center issued this tornado watch at Jun 29, 2023, 1:17 PM MDT for 13 counties in Colorado; 8 counties in Nebraska; 6 counties in Wyoming. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued: Jun 29, 2023, 1:17 PM MDT (19:17 UTC)
Expired: Jun 29, 2023, 9:00 PM MDT
In force: 8 hr
Issued by: the Storm Prediction Center
Largest hail expected: 3.5 in
Strongest gust expected: 60 kt

All 27 counties

Adams County, CO, Arapahoe County, CO, Boulder County, CO, Broomfield County, CO, Denver County, CO, Douglas County, CO, Elbert County, CO, Jefferson County, CO, Larimer County, CO, Logan County, CO, Morgan County, CO, Washington County, CO, Weld County, CO, Banner County, NE, Box Butte County, NE, Cheyenne County, NE, Dawes County, NE, Kimball County, NE, Morrill County, NE, Scotts Bluff County, NE, Sioux County, NE, Albany County, WY, Converse County, WY, Goshen County, WY, Laramie County, WY, Niobrara County, WY, Platte County, WY

The radar

The Cheyenne radar (KCYS), 73 km from the middle of the area, began a volume at 19:17 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: 40%
One or more EF2 to EF5 tornadoes: 20%
Ten or more severe wind reports: 30%
One or more gusts of 65 knots or more: 20%
Ten or more severe hail reports: 70%
One or more hailstones of 2 inches or more: 50%
Six or more combined severe hail and wind reports: 90%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 29, 1:35 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Platte	40 min
Jun 29, 1:59 PM MDT	Severe Thunderstorm Warning	CYS	Converse	46 min
Jun 29, 2:12 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Laramie, Platte	63 min
Jun 29, 2:13 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Converse, Platte	47 min
Jun 29, 2:41 PM MDT	Severe Thunderstorm Warning	CYS	Converse	49 min
Jun 29, 2:55 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Converse, Goshen, Niobrara, Platte	50 min
Jun 29, 2:56 PM MDT	Flash Flood Warning	CYS	Converse	3 hr
Jun 29, 3:11 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Laramie, Platte	64 min
Jun 29, 3:16 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	29 min
Jun 29, 3:17 PM MDT	Severe Thunderstorm Warning	BOU	Denver, Jefferson	43 min
Jun 29, 3:21 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	24 min
Jun 29, 3:22 PM MDT	Tornado Warning	CYS	Laramie, Platte	23 min
Jun 29, 3:44 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Niobrara, Platte	46 min
Jun 29, 3:52 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Broomfield, Denver, Jefferson	38 min
Jun 29, 4:01 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Goshen, Laramie, Platte	74 min
Jun 29, 4:04 PM MDT	Flash Flood Warning	CYS	Niobrara	91 min
Jun 29, 4:07 PM MDT	Flash Flood Warning	BOU	Denver, Jefferson	113 min
Jun 29, 4:28 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Arapahoe, Denver	47 min
Jun 29, 5:04 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Scotts Bluff	71 min
Jun 29, 5:08 PM MDT	Severe Thunderstorm Warning	BOU	Adams	24 min
Jun 29, 5:13 PM MDT	Severe Thunderstorm Warning Destructive damage threat	BOU	Adams, Arapahoe	47 min
Jun 29, 5:28 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BOU	Adams, Arapahoe	32 min
Jun 29, 5:41 PM MDT	Flash Flood Warning	BOU	Adams	3 hr
Jun 29, 5:42 PM MDT	Severe Thunderstorm Warning	BOU	Douglas, Jefferson	48 min
Jun 29, 6:00 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Morgan	45 min
Jun 29, 6:05 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Laramie, Platte	55 min
Jun 29, 6:18 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BOU	Adams	42 min
Jun 29, 6:58 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BOU	Adams, Morgan, Washington	47 min
Jun 29, 7:38 PM MDT	Severe Thunderstorm Warning	BOU	Morgan, Washington	37 min
Jun 29, 7:46 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Morgan	44 min
Jun 29, 8:27 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Laramie	48 min
Jun 29, 8:56 PM MDT	Severe Thunderstorm Warning	CYS	Albany	19 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

Rapid City, SD (KUNR), launched 12:00Z, 7.3 hours before the alert went out and 300 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: 2 J/kg
Mixed-layer CIN: -337 J/kg
Mixed-layer LCL: 1913 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: -11 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 28, 7:59 PM MDT	Mesoscale Discussion	SPC	Logan, Phillips, Sedgwick	91 min
Jun 28, 8:39 PM MDT	Mesoscale Discussion	SPC	Adams, Logan, Morgan, Phillips, Washington, Weld and 1 more	66 min
Jun 28, 9:03 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Logan, Morgan, Phillips, Sedgwick, Washington and 2 more	6 hr
Jun 28, 11:01 PM MDT	Mesoscale Discussion	SPC	Logan, Morgan, Phillips, Sedgwick, Washington, Weld and 1 more	89 min
Jun 29, 12:54 AM MDT	Mesoscale Discussion	SPC	Morgan, Washington, Yuma	96 min
Jun 29, 11:40 AM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Boulder, Broomfield, Denver, Douglas and 4 more	2 hr
Jun 29, 2:03 PM MDT	Mesoscale Discussion	SPC	Bent, Cheyenne, Crowley, Kiowa, Las Animas, Otero and 1 more	117 min
Jun 29, 4:12 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Broomfield, Denver, Elbert, Logan and 3 more	93 min
Jun 29, 4:31 PM MDT	Mesoscale Discussion	SPC	Baca, Prowers	89 min
Jun 29, 12:26 AM MDT	Severe Thunderstorm Watch	SPC	Adams, Buffalo, Cass, Clay, Dawson, Fillmore and 22 more	7 hr
Jun 29, 3:06 AM MDT	Mesoscale Discussion	SPC	Franklin, Gage, Harlan, Jefferson, Nuckolls, Pawnee and 3 more	84 min
Jun 29, 5:49 PM MDT	Mesoscale Discussion	SPC	Arthur, Blaine, Cherry, Garden, Grant, Hooker and 5 more	86 min

Nearby

Tornado Watches in Colorado, 2023 Tornado Watches in Nebraska, 2023 Tornado Watches in Wyoming, 2023 Every tornado watch in 2023

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.