Alert archive / Kansas / Severe Thunderstorm Watches in 2021

Severe Thunderstorm Watch 334

July 4, 202127 counties in Kansas

The Storm Prediction Center issued this severe thunderstorm watch at Jul 4, 2021, 4:01 PM CDT for 27 counties in Kansas. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Jul 4, 2021, 4:01 PM CDT (21:01 UTC)
Expired
Jul 4, 2021, 11:00 PM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 27 counties

Clark 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, Lane County, KS, Logan County, KS, Meade County, KS, Morton County, KS, Ness County, KS, Scott County, KS, Seward County, KS, Sheridan County, KS, Sherman County, KS, Stanton County, KS, Stevens County, KS, Thomas County, KS, Trego County, KS, Wallace County, KS, Wichita County, KS

The radar

The Dodge City radar (KDDC), 108 km from the middle of the area, began a volume at 21:03 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
5%
Ten or more severe wind reports
40%
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
40%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jul 4, 4:10 PM CDTSevere Thunderstorm WarningGLDGove, Graham, Sheridan35 min
Jul 4, 4:23 PM CDTSevere Thunderstorm WarningDDCFinney, Gray52 min
Jul 4, 4:26 PM CDTSevere Thunderstorm WarningGLDDecatur, Graham, Norton, Sheridan34 min
Jul 4, 4:39 PM CDTSevere Thunderstorm WarningGLDGove, Graham, Sheridan36 min
Jul 4, 4:57 PM CDTSevere Thunderstorm WarningDDCFinney, Gray, Haskell48 min
Jul 4, 4:58 PM CDTFlash Flood WarningGLDGove, Graham, Sheridan2 hr
Jul 4, 4:58 PM CDTSevere Thunderstorm WarningGLDGraham, Sheridan32 min
Jul 4, 5:12 PM CDTSevere Thunderstorm WarningDDCEdwards, Hodgeman, Ness, Pawnee33 min
Jul 4, 5:15 PM CDTSevere Thunderstorm WarningGLDGove, Logan, Sheridan60 min
Jul 4, 5:37 PM CDTSevere Thunderstorm WarningDDCGray, Haskell, Meade, Seward38 min
Jul 4, 5:56 PM CDTSevere Thunderstorm WarningDDCLane, Scott49 min
Jul 4, 6:00 PM CDTSevere Thunderstorm WarningDDCMorton, Stanton45 min
Jul 4, 6:28 PM CDTSevere Thunderstorm WarningDDCHaskell, Seward47 min
Jul 4, 6:35 PM CDTSevere Thunderstorm WarningDDCScott40 min
Jul 4, 8:24 PM CDTSevere Thunderstorm WarningDDCMorton26 min
Jul 4, 8:49 PM CDTSevere Thunderstorm WarningDDCHamilton, Kearny26 min
Jul 4, 9:05 PM CDTSevere Thunderstorm WarningGLDSherman55 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, 9.0 hours before the alert went out and 262 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 2021-07-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 204 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 2021-07-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 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
204 J/kg
Mixed-layer CIN
-314 J/kg
Mixed-layer LCL
2162 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
80 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

395 
WWUS20 KWNS 042100
SEL4  
SPC WW 042100
COZ000-KSZ000-050400-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 334
NWS Storm Prediction Center Norman OK
400 PM CDT Sun Jul 4 2021

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Eastern Colorado
  Western Kansas

* Effective this Sunday afternoon and evening from 400 PM until
  1100 PM CDT.

* Primary threats include...
  Scattered large hail and isolated very large hail events to 2
    inches in diameter possible
  Scattered damaging wind gusts to 70 mph possible

SUMMARY...Storms are expected to continue to develop and intensify
across west-central Kansas through late afternoon/early evening,
with subsequent development possible farther west across
west/southwest Kansas and possibly nearby eastern Colorado this
evening. Modest-strength winds and an unstable air mass will support
the potential for large hail and damaging winds.

The severe thunderstorm watch area is approximately along and 75
statute miles east and west of a line from 40 miles east northeast
of Goodland KS to 5 miles south southwest of Liberal KS. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU4).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A Severe Thunderstorm Watch means conditions are
favorable for severe thunderstorms in and close to the watch area.
Persons in these areas should be on the lookout for threatening
weather conditions and listen for later statements and possible
warnings. Severe thunderstorms can and occasionally do produce
tornadoes.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 333...

AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
35015.

...Guyer

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 4, 3:16 PM CDTMesoscale DiscussionSPCFinney, Ford, Gove, Grant, Gray, Haskell and 13 more89 min
Jul 4, 6:56 PM CDTMesoscale DiscussionSPCGrant, Greeley, Hamilton, Haskell, Kearny, Logan and 8 more94 min

Nearby

Severe Thunderstorm Watches in Kansas, 2021Every severe thunderstorm watch in 2021

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.