Alert archive / Colorado / Severe Thunderstorm Watches in 2020

Severe Thunderstorm Watch 262

June 6, 202039 counties in Colorado

The Storm Prediction Center issued this severe thunderstorm watch at Jun 6, 2020, 12:21 PM MDT for 39 counties in Colorado. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued
Jun 6, 2020, 12:21 PM MDT (18:21 UTC)
Expired
Jun 6, 2020, 8:00 PM MDT
In force
8 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
70 kt
All 39 counties

Adams County, CO, Alamosa County, CO, Arapahoe County, CO, Boulder County, CO, Broomfield County, CO, Chaffee County, CO, Clear Creek County, CO, Conejos County, CO, Costilla County, CO, Crowley County, CO, Custer County, CO, Denver County, CO, Douglas County, CO, El Paso County, CO, Elbert County, CO, Fremont County, CO, Gilpin County, CO, Grand County, CO, Huerfano County, CO, Jackson County, CO, Jefferson County, CO, Lake County, CO, Larimer County, CO, Las Animas County, CO, Lincoln County, CO, Logan County, CO, Mineral County, CO, Morgan County, CO, Otero County, CO, Park County, CO, Phillips County, CO, Pueblo County, CO, Rio Grande County, CO, Saguache County, CO, Sedgwick County, CO, Summit County, CO, Teller County, CO, Washington County, CO, Weld County, CO

The radar

The Denver radar (KFTG), 45 km from the middle of the area, began a volume at 18:24 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
2%
Ten or more severe wind reports
60%
One or more gusts of 65 knots or more
60%
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
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 6, 1:04 PM MDTSevere Thunderstorm WarningPUBMineral, Rio Grande, Saguache26 min
Jun 6, 1:30 PM MDTSevere Thunderstorm WarningPUBMineral, Rio Grande, Saguache30 min
Jun 6, 1:46 PM MDTSevere Thunderstorm WarningPUBConejos, Rio Grande14 min
Jun 6, 1:51 PM MDTSevere Thunderstorm WarningBOUClear Creek, Grand, Jackson, Larimer, Park, Summit39 min
Jun 6, 2:15 PM MDTSevere Thunderstorm WarningBOUElbert, Lincoln, Washington45 min
Jun 6, 2:25 PM MDTSevere Thunderstorm WarningPUBAlamosa, Rio Grande, Saguache35 min
Jun 6, 2:28 PM MDTSevere Thunderstorm WarningPUBCostilla, Huerfano, Las Animas32 min
Jun 6, 2:33 PM MDTSevere Thunderstorm WarningBOUBoulder, Clear Creek, Gilpin, Grand, Jackson, Jefferson and 3 more42 min
Jun 6, 2:34 PM MDTFlash Flood WarningPUBChaffee, Fremont, Saguache83 min
Jun 6, 2:44 PM MDTSevere Thunderstorm WarningPUBChaffee, Custer, Fremont, Saguache31 min
Jun 6, 2:59 PM MDTSevere Thunderstorm WarningPUBAlamosa, Custer, Saguache31 min
Jun 6, 3:03 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe, Boulder, Broomfield, Clear Creek, Denver and 8 more57 min
Jun 6, 3:15 PM MDTSevere Thunderstorm WarningPUBEl Paso, Fremont, Pueblo, Teller30 min
Jun 6, 3:29 PM MDTSevere Thunderstorm WarningPUBCuster, Fremont, Pueblo, Saguache16 min
Jun 6, 3:39 PM MDTSevere Thunderstorm WarningPUBEl Paso, Pueblo36 min
Jun 6, 3:43 PM MDTSevere Thunderstorm WarningPUBCuster, Fremont, Pueblo32 min
Jun 6, 3:56 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe, Boulder, Broomfield, Denver, Douglas and 4 more64 min
Jun 6, 4:01 PM MDTSevere Thunderstorm WarningPUBEl Paso, Teller44 min
Jun 6, 4:11 PM MDTSevere Thunderstorm WarningPUBEl Paso, Pueblo34 min
Jun 6, 4:19 PM MDTSevere Thunderstorm WarningPUBEl Paso, Fremont, Pueblo, Teller26 min
Jun 6, 4:34 PM MDTSevere Thunderstorm WarningPUBEl Paso, Pueblo11 min
Jun 6, 4:36 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe, Denver, Morgan, Weld39 min
Jun 6, 4:43 PM MDTSevere Thunderstorm WarningPUBCrowley, El Paso, Fremont, Pueblo32 min
Jun 6, 4:50 PM MDTSevere Thunderstorm WarningBOUElbert, Lincoln40 min
Jun 6, 4:50 PM MDTSevere Thunderstorm WarningPUBHuerfano, Las Animas, Pueblo25 min
Jun 6, 5:11 PM MDTSevere Thunderstorm WarningPUBCrowley, El Paso, Huerfano, Las Animas, Otero, Pueblo64 min
Jun 6, 5:18 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe, Logan, Morgan, Washington, Weld42 min
Jun 6, 5:27 PM MDTSevere Thunderstorm WarningBOUElbert, Lincoln48 min
Jun 6, 5:58 PM MDTSevere Thunderstorm WarningBOULogan, Washington47 min
Jun 6, 5:58 PM MDTSevere Thunderstorm WarningBOULogan, Washington47 min
Jun 6, 6:08 PM MDTSevere Thunderstorm WarningBOUElbert, Lincoln37 min
Jun 6, 6:36 PM MDTSevere Thunderstorm WarningBOULogan, Phillips, Sedgwick, Washington39 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

Denver, CO (KDNR), launched 12:00Z, 6.4 hours before the alert went out and 125 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-pSkew-T log-p diagram, Denver, CO at 12:00Z on 2020-06-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 12:00Z on 2020-06-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 15 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3284 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
15 m²/s²
0-3 km storm-relative helicity
-50 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.

IssuedProductOfficeCountiesLasted
Jun 6, 7:01 AM MDTMesoscale DiscussionSPCDelta, Dolores, Garfield, Mesa, Moffat, Montezuma and 3 more2 hr
Jun 6, 9:48 AM MDTSevere Thunderstorm WatchSPCArchuleta, Delta, Dolores, Eagle, Garfield, Gunnison and 12 more6 hr
Jun 6, 11:29 AM MDTMesoscale DiscussionSPCAdams, Alamosa, Arapahoe, Boulder, Broomfield, Clear Creek and 21 more91 min
Jun 6, 5:14 PM MDTMesoscale DiscussionSPCAdams, Arapahoe, Cheyenne, Crowley, Elbert, El Paso and 11 more2 hr

Nearby

Severe Thunderstorm Watches in Colorado, 2020Every severe thunderstorm watch in 2020

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.