Alert archive / Colorado / Severe Thunderstorm Watches in 2017

Severe Thunderstorm Watch 268

May 26, 201728 counties in Colorado; 5 counties in Nebraska; 5 counties in Wyoming

The Storm Prediction Center issued this severe thunderstorm watch at May 26, 2017, 1:00 PM MDT for 28 counties in Colorado; 5 counties in Nebraska; 5 counties in Wyoming. It was in force for 9 hr.

The area

The outline as issued.

The facts

Issued
May 26, 2017, 1:00 PM MDT (19:00 UTC)
Expired
May 26, 2017, 10:00 PM MDT
In force
9 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 38 counties

Adams County, CO, Arapahoe County, CO, Baca 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, Jefferson County, CO, Kiowa County, CO, Kit Carson County, CO, Larimer County, CO, Las Animas County, CO, Lincoln County, CO, Logan County, CO, Morgan County, CO, Otero County, CO, Phillips County, CO, Prowers County, CO, Pueblo County, CO, Sedgwick County, CO, Washington County, CO, Weld County, CO, Yuma County, CO, Banner County, NE, Cheyenne County, NE, Kimball County, NE, Morrill County, NE, Scotts Bluff County, NE, Albany County, WY, Carbon County, WY, Goshen County, WY, Laramie County, WY, Platte County, WY

The radar

The Denver radar (KFTG), 53 km from the middle of the area, began a volume at 19:02 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
40%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
70%
One or more hailstones of 2 inches or more
40%
Six or more combined severe hail and wind reports
90%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 26, 1:45 PM MDTSevere Thunderstorm WarningCYSCarbon45 min
May 26, 2:21 PM MDTSevere Thunderstorm WarningBOUWeld13 min
May 26, 2:29 PM MDTSevere Thunderstorm WarningCYSCarbon46 min
May 26, 3:11 PM MDTSevere Thunderstorm WarningCYSAlbany, Carbon43 min
May 26, 3:14 PM MDTSevere Thunderstorm WarningBOUAdams, Morgan, Washington46 min
May 26, 4:08 PM MDTSevere Thunderstorm WarningCYSBanner, Kimball67 min
May 26, 4:09 PM MDTSevere Thunderstorm WarningBOUMorgan, Washington36 min
May 26, 4:19 PM MDTTornado WarningBOUWashington26 min
May 26, 4:48 PM MDTSevere Thunderstorm WarningBOUWashington42 min
May 26, 4:49 PM MDTSevere Thunderstorm WarningPUBEl Paso26 min
May 26, 4:53 PM MDTSevere Thunderstorm WarningBOUDouglas, Elbert52 min
May 26, 5:07 PM MDTSevere Thunderstorm WarningPUBEl Paso38 min
May 26, 5:10 PM MDTTornado WarningBOUWashington35 min
May 26, 5:15 PM MDTSevere Thunderstorm WarningGLDYuma60 min
May 26, 5:28 PM MDTTornado WarningGLDYuma32 min
May 26, 5:41 PM MDTSevere Thunderstorm WarningPUBEl Paso34 min
May 26, 5:53 PM MDTSevere Thunderstorm WarningGLDYuma37 min
May 26, 5:56 PM MDTTornado WarningGLDYuma34 min
May 26, 6:00 PM MDTSevere Thunderstorm WarningCYSLaramie40 min
May 26, 6:08 PM MDTSevere Thunderstorm WarningCYSLaramie67 min
May 26, 6:10 PM MDTSevere Thunderstorm WarningPUBEl Paso50 min
May 26, 6:23 PM MDTSevere Thunderstorm WarningGLDKit Carson, Yuma52 min
May 26, 6:25 PM MDTTornado WarningBOUWashington15 min
May 26, 6:25 PM MDTTornado WarningGLDYuma12 min
May 26, 6:38 PM MDTTornado WarningCYSBanner, Kimball37 min
May 26, 6:39 PM MDTSevere Thunderstorm WarningGLDKit Carson, Yuma66 min
May 26, 6:43 PM MDTTornado WarningGLDKit Carson, Yuma47 min
May 26, 6:54 PM MDTSevere Thunderstorm WarningPUBEl Paso45 min
May 26, 6:59 PM MDTSevere Thunderstorm WarningPUBEl Paso61 min
May 26, 7:15 PM MDTTornado Warning Tornado observedGLDKit Carson17 min
May 26, 7:17 PM MDTSevere Thunderstorm WarningBOULincoln, Washington30 min
May 26, 7:18 PM MDTSevere Thunderstorm WarningGLDKit Carson, Yuma57 min
May 26, 7:20 PM MDTSevere Thunderstorm WarningBOUWashington25 min
May 26, 7:21 PM MDTSevere Thunderstorm WarningGLDYuma39 min
May 26, 7:27 PM MDTSevere Thunderstorm WarningGLDKit Carson48 min
May 26, 7:39 PM MDTSevere Thunderstorm WarningCYSKimball32 min
May 26, 7:50 PM MDTSevere Thunderstorm WarningGLDYuma17 min
May 26, 7:51 PM MDTSevere Thunderstorm WarningGLDYuma39 min
May 26, 7:52 PM MDTTornado WarningPUBEl Paso23 min
May 26, 8:01 PM MDTFlash Flood WarningGLDKit Carson, Yuma6 hr
May 26, 8:04 PM MDTSevere Thunderstorm WarningGLDKit Carson, Yuma56 min
May 26, 8:14 PM MDTTornado WarningPUBEl Paso21 min
May 26, 8:57 PM MDTSevere Thunderstorm WarningGLDKit Carson, Yuma48 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, 7.0 hours before the alert went out and 130 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 2017-05-26Temperature 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 2017-05-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 48 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
1013 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
48 m²/s²
0-3 km storm-relative helicity
189 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 26, 11:43 AM MDTMesoscale DiscussionSPCAdams, Arapahoe, Boulder, Broomfield, Denver, Elbert and 4 more2 hr
May 26, 2:38 PM MDTMesoscale DiscussionSPCAdams, Arapahoe, Bent, Boulder, Broomfield, Cheyenne and 15 more97 min
May 26, 5:14 PM MDTMesoscale DiscussionSPCAdams, Arapahoe, Baca, Bent, Cheyenne, Crowley and 15 more2 hr
May 26, 11:11 AM MDTMesoscale DiscussionSPCAlbany, Carbon, Laramie2 hr

Nearby

Severe Thunderstorm Watches in Colorado, 2017Severe Thunderstorm Watches in Nebraska, 2017Severe Thunderstorm Watches in Wyoming, 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.