Alert archive / Missouri / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 78, NWS Kansas City, MO

May 27, 2017Cass County, Jackson County, Missouri

NWS Kansas City, MO issued this severe thunderstorm warning at May 27, 2017, 12:10 PM CDT for Cass County, Jackson County, Missouri. It was in force for 50 min. 7 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 27, 2017, 12:10 PM CDT (17:10 UTC)
Expired: May 27, 2017, 1:00 PM CDT
In force: 50 min
Issued by: NWS Kansas City, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Cass County, MO, Jackson County, MO

The radar

The Pleasant Hill radar (KEAX), 6 km from the middle of the area, began a volume at 17:11 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 was reported inside it

Time	Report	Where	Remark
May 27, 12:23 PM CDT	TSTM WND GST 60	Belton, MO
May 27, 12:36 PM CDT	TSTM WND DMG	4 Nw Harrisonville, MO	DELAYED REPORT OF TREES DOWN ON BARN AND FENCE, 12 INCHES AND 20 PLUS INCHES IN DIAMETER, RESPECTIVELY.
May 27, 12:36 PM CDT	HAIL 2.5	Archie, MO	DELAYED REPORT...PHOTO OF TENNIS BALL SIZED HAIL IN ARCHIE
May 27, 12:39 PM CDT	TSTM WND GST 60	Harrisonville, MO	BRANCHES BREAKING
May 27, 12:40 PM CDT	TSTM WND GST 60	Pleasant Hill, MO	ESTIMATED 60MPH GUSTS AT WFO EAX
May 27, 12:46 PM CDT	HAIL 1.75	6 N Adrian, MO	GOLFBALL SIZE HAIL REPORTED AT CONOCO IN ARCHIE
May 27, 12:47 PM CDT	HAIL 1	3 N Archie, MO	I-49 AND 327TH STREET

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 7 storm reports to this severe thunderstorm warning; the first came 13 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 5.2 hours before the alert went out and 215 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: 3187 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 766 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 127 m²/s²
0-3 km storm-relative helicity: 138 m²/s²
Significant tornado parameter: 1.8
Supercell composite: 9.6

Open this sounding in Storm Lab

The text

As transmitted.

279 
WUUS53 KEAX 271710
SVREAX
MOC037-095-271800-
/O.NEW.KEAX.SV.W.0078.170527T1710Z-170527T1800Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Kansas City/Pleasant Hill MO
1210 PM CDT SAT MAY 27 2017

The National Weather Service in Pleasant Hill has issued a

* Severe Thunderstorm Warning for...
  Cass County in west central Missouri...
  Jackson County in west central Missouri...

* Until 100 PM CDT

* At 1209 PM CDT, severe thunderstorms were located along a line
  extending from Lake Quivira to 6 miles west of Belton to near
  Drexel, moving east at 35 mph.

  HAZARD...60 mph wind gusts and quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees. 

* Locations impacted include...
  Kansas City, Independence, Lee's Summit, Blue Springs, Raytown,
  Grandview, Belton, Raymore, Grain Valley, Harrisonville, Pleasant
  Hill, Oak Grove, Greenwood, Peculiar, Sugar Creek, Buckner, Lake
  Lotawana, Garden City, Archie and Lake Winnebago.

This includes the following highways...
 Interstate 70 in Missouri between mile markers 1 and 28.
 Interstate 35 in Missouri between mile markers 1 and 3.
 Interstate 470 between mile markers 0 and 16.
 Interstate 435 between mile markers 58 and 74.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3848 9461 3911 9460 3917 9414 3913 9411
      3871 9413 3845 9411
TIME...MOT...LOC 1709Z 263DEG 32KT 3904 9474 3881 9464 3853 9467 

HAIL...1.00IN
WIND...60MPH
 
$$

Blair

2 follow-up statements

895 
WWUS53 KEAX 271722
SVSEAX

Severe Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
1222 PM CDT SAT MAY 27 2017

MOC037-095-271800-
/O.CON.KEAX.SV.W.0078.000000T0000Z-170527T1800Z/
Cass MO-Jackson MO-
1222 PM CDT SAT MAY 27 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 100 PM CDT
FOR CASS AND JACKSON COUNTIES...

At 1222 PM CDT, severe thunderstorms were located along a line
extending from Westwood Hills to Belton to near Freeman, moving east
at 35 mph.

HAZARD...60 mph wind gusts and quarter size hail. 

SOURCE...Radar indicated. 

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees. 

Locations impacted include...
Kansas City, Independence, Lee's Summit, Blue Springs, Raytown,
Grandview, Belton, Raymore, Grain Valley, Harrisonville, Pleasant
Hill, Oak Grove, Greenwood, Peculiar, Lake Lotawana, Garden City,
Archie, Lake Winnebago, Lone Jack and Drexel.

This includes the following highways...
 Interstate 70 in Missouri between mile markers 10 and 29.
 Interstate 470 between mile markers 0 and 16.
 Interstate 435 between mile markers 64 and 74.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

A tornado watch remains in effect until 700 PM CDT for west central
Missouri.

LAT...LON 3848 9461 3904 9460 3908 9411 3871 9413
      3845 9411
TIME...MOT...LOC 1722Z 263DEG 32KT 3905 9460 3882 9450 3854 9453 

HAIL...1.00IN
WIND...60MPH
 
$$

Blair

879 
WWUS53 KEAX 271743
SVSEAX

Severe Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
1243 PM CDT SAT MAY 27 2017

MOC037-095-271800-
/O.CON.KEAX.SV.W.0078.000000T0000Z-170527T1800Z/
Cass MO-Jackson MO-
1243 PM CDT SAT MAY 27 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 100 PM CDT
FOR CASS AND SOUTHEASTERN JACKSON COUNTIES...

At 1243 PM CDT, severe thunderstorms were located along a line
extending from Lake Tapawingo to Baldwin Park to near Garden City,
moving east at 40 mph.

HAZARD...60 mph wind gusts and quarter size hail. 

SOURCE...Trained weather spotters. 

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees. 

Locations impacted include...
Kansas City, Independence, Lee's Summit, Blue Springs, Raymore, Grain
Valley, Harrisonville, Pleasant Hill, Oak Grove, Greenwood, Lake
Lotawana, Garden City, Archie, Lake Winnebago, Lone Jack, Lake
Tapawingo, East Lynne, Baldwin Park, Strasburg and Gunn City.

This includes the following highways...
 Interstate 70 in Missouri between mile markers 13 and 29.
 Interstate 470 between mile markers 7 and 16.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

A tornado watch remains in effect until 700 PM CDT for west central
Missouri.

LAT...LON 3847 9443 3905 9442 3908 9411 3871 9413
      3845 9411
TIME...MOT...LOC 1743Z 268DEG 34KT 3902 9432 3879 9422 3851 9425 

HAIL...1.00IN
WIND...60MPH
 
$$

Blair

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Kansas City, MO wrote its last area forecast discussion before this severe thunderstorm warning went out at May 27, 5:52 AM CDT, 6 hours 18 minutes earlier.

Area forecast discussion, May 27, 5:52 AM CDT, 6 hours 18 minutes before

AREA FORECAST DISCUSSION
National Weather Service Kansas City/Pleasant Hill MO
552 AM CDT Sat May 27 2017

.Discussion...
Issued at 206 AM CDT SAT MAY 27 2017

The potential for widespread severe weather this afternoon and
evening continues to increase as short-term trends come into higher
resolution. An MCS is currently advancing eastward across south
central Nebraska and north central Kansas as of early Saturday
morning. This activity will undergo only slight weakening as it
approaches northwest Missouri by the mid-morning. The cold pool
generated from the MCS may play a critical role in the development
of anticipated severe weather this afternoon. As the MCS crosses
into northwest Missouri, a surface low will lift northeastward into
eastern Kansas by the mid-afternoon, bringing with it a highly
unstable airmass up against the I-70 corridor. Surface dewpoint
values will increase into the upper 60s to lower 70s over areas
south of the Missouri River. Meanwhile, a mid-level shortwave will
eject out of an upper-level trough situated over the Northern and
Central Rockies, atop a primed low-level environment. This will
all equate to a highly favorable setup for robust convection by
the early afternoon into the evening, particularly for areas just
north of I-70, extending to points well south. The surface low
should be limited in its northeastward trek as the MCS-driven cold
pool pushes against it. This will in turn present strong surface
convergence within a highly unstable environment, as MUCAPE values
exceed 4000 J/kg along and south of the warm front. With ample
mid-level flow, 0-6 km shear values of 40+ knots will support
rotating updrafts. Also expecting backed surface winds in the
vicinity of the warm front and points south, thus increasing the
potential for a few tornadoes across central Missouri this
afternoon before the surface low surges southeastward. The
tornadic potential may be increased near the surface low, which
looks to position itself near west central to southwestern
Missouri Saturday afternoon/evening. Aside from the tornadic
potential, very large hail and damaging winds are possible as the
storm system advances from eastern Kansas and western Missouri
early this afternoon and steadily pushes southeastward by the
early evening into central Missouri. With the holiday weekend in
full swing, action plans will need to be considered no later than
Saturday morning, especially for those camping, who may be
unfamiliar with local storm shelters in the relevant areas.

By Sunday morning, steady northwesterly surface winds are expected
in the wake of the exiting storm system and dry conditions will be
maintained through the latter half of the holiday weekend.
Temperatures will remain steady at near-seasonal values through
much of the upcoming week. May see additional storm development by
the mid-week, though forcing will remain rather limited until the
late week. At that point, models point to the possibility of a
large region of moisture advection extending into the Northern
Plains as the upper jet migrates well north. Any overhead impulses
could trigger warm advection showers/storms, though a blocking
ridge pattern should limit widespread precipitation chances.

&&

.Aviation...(For the 12Z TAFS through 12Z Sunday Morning)
Issued at 547 AM CDT SAT MAY 27 2017

Dry conditions will continue through the late morning to early
afternoon before thunderstorm activity approaches the terminals
from eastern Kansas. Gusty winds and marginally reduced
visibility is possible coincident with this activity, though
storms will quickly progress eastward by the late afternoon.
Surface winds will become northwesterly in the wake of the
activity and low level stratus will likely linger overnight. Could
see a brief period of MVFR ceilings before VFR conditions return
Sunday morning.

&&

.EAX WATCHES/WARNINGS/ADVISORIES...
KS...NONE.
MO...NONE.
&&

Discussion...Welsh
Aviation...Welsh

Hazardous weather outlook, May 27, 5:42 AM CDT, 6 hours 28 minutes before

Hazardous Weather Outlook
National Weather Service Kansas City/Pleasant Hill MO
542 AM CDT Sat May 27 2017

KSZ025-057-060-102>105-MOZ001>008-011>017-020>025-028>033-037>040-
043>046-053-054-281045-
Atchison KS-Miami-Linn KS-Doniphan-Leavenworth-Wyandotte-Johnson KS-
Atchison MO-Nodaway-Worth-Gentry-Harrison-Mercer-Putnam-Schuyler-
Holt-Andrew-De Kalb-Daviess-Grundy-Sullivan-Adair-Buchanan-Clinton-
Caldwell-Livingston-Linn MO-Macon-Platte-Clay-Ray-Carroll-Chariton-
Randolph-Jackson-Lafayette-Saline-Howard-Cass-Johnson MO-Pettis-
Cooper-Bates-Henry-
542 AM CDT Sat May 27 2017

This hazardous weather outlook is for northwest...north central and
west central Missouri...as well as extreme eastern Kansas.

.DAY ONE...Today and Tonight

 Widespread thunderstorm activity is expected today as a very
 unstable airmass develops over the region. Severe thunderstorm
 development is expected with all forms of severe weather possible.

 More detailed information can be accessed at...
 https://www.weather.gov/eax/hwo

.DAYS TWO THROUGH SEVEN...Sunday through Friday

 No severe weather expected.

 More detailed information can be accessed at...
 https://www.weather.gov/eax/hwo

In the hours before

Special weather statement, May 27, 8:33 AM CDT, 3 hours 37 minutes before

Special Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
833 AM CDT SAT MAY 27 2017

MOZ002-271400-
Nodaway MO-
833 AM CDT SAT MAY 27 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN NODAWAY COUNTY UNTIL
900 AM CDT...

At 833 AM CDT, Doppler radar was tracking a strong thunderstorm near
Maryville, moving northeast at 30 mph.

Dime size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Maryville, Hopkins and Pickering.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 4057 9463 4047 9463 4030 9491 4036 9501
      4057 9485
TIME...MOT...LOC 1333Z 220DEG 28KT 4038 9491

Cutter

Special weather statement, May 27, 9:06 AM CDT, 3 hours 4 minutes before

Special Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
906 AM CDT SAT MAY 27 2017

MOZ021-022-029-030-271445-
Ray MO-Clinton MO-Caldwell MO-Clay MO-
906 AM CDT SAT MAY 27 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN CLAY...EASTERN
CLINTON...NORTHWESTERN RAY AND WESTERN CALDWELL COUNTIES UNTIL 945 AM
CDT...

At 905 AM CDT, Doppler radar was tracking a strong thunderstorm over
Lathrop, moving east at 30 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Excelsior Springs, Cameron, Lawson, Lathrop, Polo, Holt, Crystal
Lakes, Kingston, Excelsior Estates, Woods Heights, Homestead, Turney,
Prathersville, Elmira and Knoxville.

This includes Interstate 35 in Missouri between mile markers 33 and
53.

LAT...LON 3941 9388 3932 9427 3947 9433 3947 9434
      3971 9444 3977 9407
TIME...MOT...LOC 1405Z 266DEG 24KT 3952 9430

Pietrycha

Special weather statement, May 27, 9:13 AM CDT, 2 hours 57 minutes before

Special Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
913 AM CDT SAT MAY 27 2017

MOZ003>005-013-014-271500-
Daviess MO-De Kalb MO-Worth MO-Gentry MO-Harrison MO-
913 AM CDT SAT MAY 27 2017

...SIGNIFICANT WEATHER ADVISORY FOR WORTH...NORTHWESTERN DAVIESS...
GENTRY...HARRISON AND NORTHEASTERN DEKALB COUNTIES UNTIL 1000 AM
CDT...

At 913 AM CDT, Doppler radar was tracking a strong thunderstorm near
Albany, moving east at 30 mph.

Dime size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Bethany, Albany, Stanberry, King City, Grant City, Ridgeway,
Pattonsburg, Eagleville, New Hampton, Irena, Blythedale, Coffey,
Jameson, Darlington, Mcfall, Gentry, Worth, Allendale, Denver and
Hatfield.

This includes Interstate 35 in Missouri between mile markers 72 and
113.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3995 9451 4057 9460 4057 9391 4000 9390
TIME...MOT...LOC 1413Z 266DEG 24KT 4026 9441

Pietrycha

Special weather statement, May 27, 9:29 AM CDT, 2 hours 41 minutes before

Special Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
929 AM CDT SAT MAY 27 2017

MOZ014-022-023-030-031-271515-
Ray MO-Carroll MO-Daviess MO-Livingston MO-Caldwell MO-
929 AM CDT SAT MAY 27 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN DAVIESS...NORTHEASTERN
RAY...NORTHWESTERN CARROLL...CALDWELL AND WESTERN LIVINGSTON COUNTIES
UNTIL 1015 AM CDT...

At 929 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 8 miles south of Pattonsburg to 8 miles south
of Polo. Movement was northeast at 35 mph.

Dime size hail and winds in excess of 40 mph will be possible with
these storms.

Locations impacted include...
Hamilton, Gallatin, Braymer, Polo, Breckenridge, Kingston, Utica,
Cowgill, Kidder, Winston, Altamont, Ludlow, Mooresville, Lock
Springs, Spring Hill, Knoxville and Dawn.

This includes Interstate 35 in Missouri between mile markers 62 and
68.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3996 9364 3951 9350 3941 9404 3994 9420
TIME...MOT...LOC 1429Z 213DEG 32KT 3992 9417 3943 9400

Pietrycha

Special weather statement, May 27, 11:27 AM CDT, 43 minutes before

Special Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
1127 AM CDT SAT MAY 27 2017

KSZ103>105-271715-
Johnson KS-Wyandotte KS-Leavenworth KS-
1127 AM CDT SAT MAY 27 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN WYANDOTTE...
SOUTHWESTERN LEAVENWORTH AND JOHNSON COUNTIES UNTIL 1215 PM CDT...

At 1127 AM CDT, Doppler radar was tracking a strong thunderstorm near
Eudora, or 8 miles northeast of Baldwin City, moving east at 45 mph.

Nickel size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Overland Park, Olathe, Shawnee, Lenexa, Leawood, Prairie Village,
Gardner, Merriam, Mission, Bonner Springs, De Soto, Spring Hill,
Fairway, Mission Hills, Edgerton, Westwood, Lake Quivira, Linwood,
Westwood Hills and Mission Woods.

This includes the following highways...
 Interstate 35 in Kansas between mile markers 202 and 230.
 Interstate 635 near mile marker 0.
 Interstate 435 between mile markers 0 and 8, and between mile
markers 76 and 83.
 Kansas Turnpike between mile markers 208 and 212.

LAT...LON 3905 9516 3904 9461 3874 9461 3874 9506
      3898 9506 3899 9507 3898 9509 3897 9508
      3896 9508 3896 9509 3897 9511 3897 9514
TIME...MOT...LOC 1627Z 250DEG 38KT 3888 9510

Pietrycha

Local storm report, May 27, 11:59 AM CDT, 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
1159 AM CDT SAT MAY 27 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1156 AM     TSTM WND GST     2 NE GARDNER            38.83N 94.89W
05/27/2017  M50 MPH          JOHNSON            KS   ASOS

&&

LAFLIN

The office that day

Everything else NWS Kansas City, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 27, 7:41 AM CDT	Special Weather Statement	EAX	Atchison, Holt	34 min
May 27, 8:30 AM CDT	Special Weather Statement	EAX	Clay, Platte	30 min
May 27, 8:33 AM CDT	Special Weather Statement	EAX	Nodaway	27 min
May 27, 9:06 AM CDT	Special Weather Statement	EAX	Clinton	39 min
May 27, 9:13 AM CDT	Special Weather Statement	EAX	Gentry, Harrison, Worth	47 min
May 27, 9:29 AM CDT	Special Weather Statement	EAX	Caldwell	46 min
May 27, 9:41 AM CDT	Severe Thunderstorm Warning	EAX	Caldwell, Carroll, Daviess, Grundy, Livingston, Ray	34 min
May 27, 12:29 PM CDT	Severe Thunderstorm Warning	EAX	Bates	46 min
May 27, 12:49 PM CDT	Severe Thunderstorm Warning	EAX	Cass, Henry, Johnson, Lafayette	56 min
May 27, 1:15 PM CDT	Tornado Warning	EAX	Henry	30 min
May 27, 1:36 PM CDT	Severe Thunderstorm Warning	EAX	Henry, Johnson, Lafayette, Pettis, Saline	43 min
May 27, 2:08 PM CDT	Severe Thunderstorm Warning	EAX	Cooper	52 min
May 27, 5:16 PM CDT	Special Weather Statement	EAX	Jackson	29 min
May 27, 5:22 PM CDT	Severe Thunderstorm Warning	EAX	Cass, Jackson	38 min
May 27, 5:47 PM CDT	Special Weather Statement	EAX	Johnson	43 min
May 27, 6:13 PM CDT	Severe Thunderstorm Warning	EAX	Cooper, Pettis, Saline	35 min
May 27, 6:43 PM CDT	Special Weather Statement	EAX	Cooper	32 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2017 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.