Alert archive / Kansas / Severe Thunderstorm Watches in 2018

Severe Thunderstorm Watch 309

July 25, 201811 counties in Colorado; 44 counties in Kansas

The Storm Prediction Center issued this severe thunderstorm watch at Jul 25, 2018, 4:29 PM MDT for 11 counties in Colorado; 44 counties in Kansas. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Jul 25, 2018, 4:29 PM MDT (22:29 UTC)
Expired
Jul 25, 2018, 11:23 PM MDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2.5 in
Strongest gust expected
60 kt
All 55 counties

Baca County, CO, Bent County, CO, Cheyenne County, CO, Crowley County, CO, Kiowa County, CO, Kit Carson County, CO, Lincoln County, CO, Otero County, CO, Prowers County, CO, Washington County, CO, Yuma County, CO, Barton County, KS, Cheyenne County, KS, Clark County, KS, Decatur County, KS, Edwards County, KS, Ellis County, KS, Finney County, KS, Ford County, KS, Gove County, KS, Graham County, KS, Grant County, KS, Gray County, KS, Greeley County, KS, Hamilton County, KS, Haskell County, KS, Hodgeman County, KS, Kearny County, KS, Kiowa County, KS, Lane County, KS, Logan County, KS, Meade County, KS, Morton County, KS, Ness County, KS, Norton County, KS, Osborne County, KS, Pawnee County, KS, Phillips County, KS, Pratt County, KS, Rawlins County, KS, Rooks County, KS, Rush County, KS, Russell County, KS, Scott County, KS, Seward County, KS, Sheridan County, KS, Sherman County, KS, Smith County, KS, Stafford County, KS, Stanton County, KS, Stevens County, KS, Thomas County, KS, Trego County, KS, Wallace County, KS, Wichita County, KS

The radar

The Goodland radar (KGLD), 48 km from the middle of the area, began a volume at 22:32 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
20%
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
90%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jul 25, 4:34 PM MDTSevere Thunderstorm WarningGLDGraham, Norton41 min
Jul 25, 4:50 PM MDTSevere Thunderstorm WarningGLDGraham40 min
Jul 25, 4:54 PM MDTSevere Thunderstorm WarningGLDGove51 min
Jul 25, 4:59 PM MDTSevere Thunderstorm WarningGIDRooks46 min
Jul 25, 5:11 PM MDTSevere Thunderstorm WarningDDCEllis, Trego49 min
Jul 25, 5:13 PM MDTFlash Flood WarningGLDGraham111 min
Jul 25, 5:21 PM MDTSevere Thunderstorm WarningDDCLane, Scott54 min
Jul 25, 5:23 PM MDTSevere Thunderstorm WarningGLDGove37 min
Jul 25, 5:28 PM MDTFlash Flood WarningGLDGove58 min
Jul 25, 5:36 PM MDTSevere Thunderstorm WarningDDCTrego54 min
Jul 25, 5:44 PM MDTSevere Thunderstorm WarningGLDGove13 min
Jul 25, 5:54 PM MDTSevere Thunderstorm WarningDDCEllis, Ness, Rush, Trego51 min
Jul 25, 6:09 PM MDTSevere Thunderstorm WarningDDCLane, Scott51 min
Jul 25, 6:39 PM MDTSevere Thunderstorm WarningDDCNess, Pawnee, Rush36 min
Jul 25, 6:42 PM MDTSevere Thunderstorm WarningDDCFinney, Lane, Scott48 min
Jul 25, 7:04 PM MDTSevere Thunderstorm WarningDDCHamilton, Stanton29 min
Jul 25, 7:27 PM MDTSevere Thunderstorm WarningDDCEdwards, Ford, Hodgeman, Ness, Pawnee78 min
Jul 25, 7:29 PM MDTSevere Thunderstorm WarningDDCFinney, Gray, Lane46 min
Jul 25, 8:09 PM MDTSevere Thunderstorm WarningDDCClark, Comanche, Edwards, Ford, Kiowa, Meade66 min
Jul 25, 8:13 PM MDTSevere Thunderstorm WarningDDCFinney, Gray47 min
Jul 25, 8:53 PM MDTFlash Flood WarningPUBBaca, Bent, Las Animas, Prowers3 hr
Jul 25, 8:57 PM MDTSevere Thunderstorm WarningDDCFinney, Ford, Gray, Haskell, Meade48 min
Jul 25, 9:23 PM MDTSevere Thunderstorm WarningPUBKiowa, Prowers37 min
Jul 25, 9:54 PM MDTSevere Thunderstorm WarningGLDGove18 min
Jul 25, 9:55 PM MDTSevere Thunderstorm WarningGLDGreeley20 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, 10.5 hours before the alert went out and 178 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 2018-07-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 20 joules per kilogram.LCLLFCEL10008507005003002001001 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 2018-07-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 87 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
20 J/kg
Mixed-layer CIN
-431 J/kg
Mixed-layer LCL
2245 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
87 m²/s²
0-3 km storm-relative helicity
74 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
Jul 25, 12:48 PM MDTMesoscale DiscussionSPCAdams, Arapahoe, Boulder, Broomfield, Denver, Douglas and 7 more57 min
Jul 25, 12:56 PM MDTMesoscale DiscussionSPCCheyenne, Kit Carson3 hr
Jul 25, 1:22 PM MDTSevere Thunderstorm WatchSPCAdams, Arapahoe, Boulder, Broomfield, Denver, Douglas and 8 more6 hr
Jul 25, 5:08 PM MDTMesoscale DiscussionSPCAdams, Arapahoe, Boulder, Broomfield, Clear Creek, Denver and 14 more2 hr

Nearby

Severe Thunderstorm Watches in Kansas, 2018Severe Thunderstorm Watches in Colorado, 2018Every severe thunderstorm watch in 2018

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.