Alert archive / Colorado / Severe Thunderstorm Watches in 2017

Severe Thunderstorm Watch 197

May 8, 201728 counties in Colorado

The Storm Prediction Center issued this severe thunderstorm watch at May 8, 2017, 12:35 PM MDT for 28 counties in Colorado. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
May 8, 2017, 12:35 PM MDT (18:35 UTC)
Expired
May 8, 2017, 8:00 PM MDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 28 counties

Adams County, CO, Arapahoe County, CO, Bent County, CO, Boulder County, CO, Broomfield County, CO, Cheyenne County, CO, Crowley County, CO, Denver County, CO, Douglas County, CO, El Paso County, CO, Elbert County, CO, Fremont County, CO, Huerfano County, CO, Jefferson County, CO, Kiowa County, CO, Kit Carson County, CO, Las Animas County, CO, Lincoln County, CO, Logan County, CO, Morgan County, CO, Otero County, CO, Phillips County, CO, Pueblo County, CO, Sedgwick County, CO, Teller County, CO, Washington County, CO, Weld County, CO, Yuma County, CO

The radar

The Denver radar (KFTG), 68 km from the middle of the area, began a volume at 18:37 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
2%
Ten or more severe wind reports
50%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
50%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 8, 1:47 PM MDTSevere Thunderstorm WarningPUBLas Animas58 min
May 8, 2:20 PM MDTTornado WarningPUBCuster, Huerfano, Pueblo25 min
May 8, 2:25 PM MDTSevere Thunderstorm WarningBOUClear Creek, Jefferson21 min
May 8, 2:43 PM MDTSevere Thunderstorm WarningPUBLas Animas62 min
May 8, 2:44 PM MDTSevere Thunderstorm WarningBOULarimer, Weld46 min
May 8, 2:45 PM MDTSevere Thunderstorm WarningBOUAdams, Boulder, Broomfield, Denver, Jefferson45 min
May 8, 2:47 PM MDTSevere Thunderstorm WarningPUBPueblo43 min
May 8, 2:50 PM MDTTornado WarningBOUArapahoe, Elbert28 min
May 8, 3:21 PM MDTSevere Thunderstorm WarningBOUAdams, Broomfield, Denver, Jefferson39 min
May 8, 3:22 PM MDTSevere Thunderstorm WarningPUBEl Paso, Fremont, Huerfano, Pueblo38 min
May 8, 3:25 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe, Elbert50 min
May 8, 3:31 PM MDTSevere Thunderstorm WarningPUBOtero, Pueblo59 min
May 8, 3:34 PM MDTSevere Thunderstorm WarningBOULincoln, Washington41 min
May 8, 3:37 PM MDTSevere Thunderstorm WarningPUBLas Animas, Otero, Pueblo38 min
May 8, 3:51 PM MDTSevere Thunderstorm WarningBOUWeld39 min
May 8, 3:54 PM MDTSevere Thunderstorm WarningPUBEl Paso, Fremont, Pueblo66 min
May 8, 4:14 PM MDTSevere Thunderstorm WarningPUBOtero15 min
May 8, 4:23 PM MDTSevere Thunderstorm WarningBOUElbert, Lincoln37 min
May 8, 4:24 PM MDTSevere Thunderstorm WarningPUBCrowley, Otero23 min
May 8, 4:28 PM MDTSevere Thunderstorm WarningBOUWeld47 min
May 8, 4:59 PM MDTSevere Thunderstorm WarningBOUElbert, Lincoln25 min
May 8, 5:00 PM MDTFlash Flood WarningBOUWeld3 hr
May 8, 5:20 PM MDTSevere Thunderstorm WarningBOULincoln, Washington40 min
May 8, 5:24 PM MDTSevere Thunderstorm WarningPUBCrowley, Otero, Pueblo36 min
May 8, 6:36 PM MDTSevere Thunderstorm WarningPUBLas Animas, Pueblo24 min
May 8, 7:13 PM MDTSevere Thunderstorm WarningPUBLas Animas32 min
May 8, 7:42 PM MDTSevere Thunderstorm WarningPUBOtero33 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 (KDEN), launched 12:00Z, 6.6 hours before the alert went out and 80 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 2017-05-08Temperature 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 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 2017-05-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 6 square meters per square second.193958Sfc1 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
2189 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
6 m²/s²
0-3 km storm-relative helicity
72 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
May 8, 12:01 PM MDTMesoscale DiscussionSPCAdams, Arapahoe, Baca, Bent, Boulder, Broomfield and 24 more89 min
May 8, 2:59 PM MDTMesoscale DiscussionSPCAdams, Arapahoe, Bent, Boulder, Broomfield, Cheyenne and 27 more91 min

Nearby

Severe Thunderstorm Watches in Colorado, 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.