Alert archive / Missouri / Tornado Watches in 2016

Tornado Watch 458

August 26, 2016Johnson County, Leavenworth County, Wyandotte County, Kansas; 13 counties in Missouri

The Storm Prediction Center issued this tornado watch at Aug 26, 2016, 6:13 PM CDT for Johnson County, Leavenworth County, Wyandotte County, Kansas; 13 counties in Missouri. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Aug 26, 2016, 6:13 PM CDT (23:13 UTC)
Expired: Aug 26, 2016, 10:00 PM CDT
In force: 4 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1 in
Strongest gust expected: 60 kt

Counties Johnson County, KS, Leavenworth County, KS, Wyandotte County, KS, Andrew County, MO, Buchanan County, MO, Caldwell County, MO, Carroll County, MO, Clay County, MO, Clinton County, MO, Daviess County, MO, DeKalb County, MO, Grundy County, MO, Jackson County, MO, Livingston County, MO, Platte County, MO, Ray County, MO

The radar

The Pleasant Hill radar (KEAX), 97 km from the middle of the area, began a volume at 23:15 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: 30%
One or more EF2 to EF5 tornadoes: 5%
Ten or more severe wind reports: 30%
One or more gusts of 65 knots or more: 10%
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: 60%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Aug 26, 6:13 PM CDT	Severe Thunderstorm Warning	EAX	Andrew	32 min
Aug 26, 6:18 PM CDT	Tornado Warning	EAX	Buchanan, Clay, Clinton, Platte	42 min
Aug 26, 7:13 PM CDT	Severe Thunderstorm Warning	EAX	Caldwell, Clay, Clinton	32 min
Aug 26, 7:22 PM CDT	Tornado Warning	EAX	Caldwell, Clinton, Ray	23 min
Aug 26, 7:43 PM CDT	Tornado Warning Tornado observed	EAX	Caldwell, Clinton	32 min
Aug 26, 7:52 PM CDT	Flash Flood Warning	EAX	Leavenworth, Wyandotte	6 hr
Aug 26, 8:33 PM CDT	Severe Thunderstorm Warning	EAX	Caldwell, Carroll, Daviess, DeKalb, Grundy, Livingston	42 min
Aug 26, 8:43 PM CDT	Flash Flood Warning	EAX	Andrew, Buchanan, DeKalb, Gentry	5 hr
Aug 26, 9:14 PM CDT	Flash Flood Warning	EAX	Caldwell, Daviess, Livingston, Ray	6 hr
Aug 26, 9:18 PM CDT	Flash Flood Warning	EAX	Johnson	3 hr
Aug 26, 9:47 PM CDT	Flash Flood Warning Emergency	EAX	Johnson, Wyandotte	4 hr

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Topeka, KS (KFOE), launched 12:00Z, 11.2 hours before the alert went out and 136 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 75 J/kg
Mixed-layer CIN: -135 J/kg
Mixed-layer LCL: 889 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 12 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

658 
WWUS20 KWNS 262310
SEL8  
SPC WW 262310
KSZ000-MOZ000-270300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 458
NWS STORM PREDICTION CENTER NORMAN OK
610 PM CDT FRI AUG 26 2016

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  EXTREME NORTHEAST KANSAS
  NORTHWEST MISSOURI

* EFFECTIVE THIS FRIDAY EVENING FROM 610 PM UNTIL 1000 PM CDT.

* PRIMARY THREATS INCLUDE...
  A COUPLE TORNADOES POSSIBLE
  ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
  ISOLATED LARGE HAIL EVENTS TO 1 INCH IN DIAMETER POSSIBLE

SUMMARY...A BAND OF STORMS...SOME WITH SUPERCELL
CHARACTERISTICS...SHOULD PERSIST FOR A FEW HOURS THIS EVENING ACROSS
NORTHWEST MISSOURI.  THE STORM ENVIRONMENT IS MARGINALLY FAVORABLE
FOR A TORNADO OR TWO...ALONG WITH ISOLATED DAMAGING GUSTS AND SOME
HAIL.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 30 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 10 MILES NORTH NORTHWEST OF
LEAVENWORTH KANSAS TO 15 MILES EAST SOUTHEAST OF CHILLICOTHE
MISSOURI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND 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.

&&

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.
MEAN STORM MOTION VECTOR 26025.


...THOMPSON

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 26, 1:54 PM CDT	Mesoscale Discussion	SPC	Atchison, Brown, Doniphan, Douglas, Jackson, Jefferson and 8 more	2 hr

Nearby

Tornado Watches in Missouri, 2016 Tornado Watches in Kansas, 2016 Every tornado watch in 2016

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.