Alert archive / Missouri / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 102, NWS Kansas City, MO

June 11, 20187 counties in Missouri

NWS Kansas City, MO issued this severe thunderstorm warning at Jun 11, 2018, 8:58 PM CDT for 7 counties in Missouri. It was in force for 32 min. 1 report 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: Jun 11, 2018, 8:58 PM CDT (01:58 UTC)
Expired: Jun 11, 2018, 9:30 PM CDT
In force: 32 min
Issued by: NWS Kansas City, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 70.0 mph

Counties Andrew County, MO, Atchison County, MO, Gentry County, MO, Harrison County, MO, Holt County, MO, Nodaway County, MO, Worth County, MO

The radar

The Omaha radar (KOAX), 163 km from the middle of the area, began a volume at 01:59 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
Jun 11, 9:05 PM CDT	TSTM WND GST 60	4 N Darlington, MO

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 one storm report to this severe thunderstorm warning; the first came 7 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 11, 3:42 PM CDT	Tornado Watch	SPC	6 hr
Jun 11, 6:12 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Topeka, KS (KFOE), launched 00:00Z, 2.0 hours before the alert went out and 144 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: 3203 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 1854 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 114 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 9.8

Open this sounding in Storm Lab

The text

As transmitted.

545 
WUUS53 KEAX 120158
SVREAX
MOC003-005-075-081-087-147-227-120230-
/O.NEW.KEAX.SV.W.0102.180612T0158Z-180612T0230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Kansas City/Pleasant Hill MO
858 PM CDT MON JUN 11 2018

The National Weather Service in Pleasant Hill has issued a

* Severe Thunderstorm Warning for...
  Worth County in northwestern Missouri...
  Northwestern Gentry County in northwestern Missouri...
  Southeastern Atchison County in northwestern Missouri...
  Northwestern Harrison County in north central Missouri...
  Holt County in northwestern Missouri...
  Nodaway County in northwestern Missouri...
  Northern Andrew County in northwestern Missouri...

* Until 930 PM CDT.

* At 857 PM CDT, severe thunderstorms were located along a line
  extending from Irena to near Maryville to near Craig, moving
  southeast at 35 mph.

  HAZARD...70 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect considerable 
           tree damage. Wind damage is also likely to mobile homes, 
           roofs, and outbuildings.

* Locations impacted include...
  Maryville, Stanberry, Mound City, Grant City, Oregon, Ravenwood,
  Maitland, Skidmore, Forest City, Craig, Fillmore, White Cloud,
  Irena, Barnard, Conception Junction, Sheridan, Parnell, Bolckow,
  Graham and Pickering.

This includes Interstate 29 between mile markers 71 and 99.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4057 9404 4012 9455 3995 9525 3999 9531
      4001 9532 4004 9542 4007 9539 4012 9539
      4018 9548 4024 9547 4025 9551 4026 9549
      4040 9498 4057 9468
TIME...MOT...LOC 0157Z 306DEG 29KT 4057 9437 4030 9484 4015 9545 

HAIL...1.00IN
WIND...70MPH
 
$$

Welsh

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 Jun 11, 6:43 PM CDT, 2 hours 15 minutes earlier.

Area forecast discussion, Jun 11, 6:43 PM CDT, 2 hours 15 minutes before

AREA FORECAST DISCUSSION
National Weather Service Kansas City/Pleasant Hill MO
643 PM CDT Mon Jun 11 2018

.Discussion...
Issued at 324 PM CDT MON JUN 11 2018

Primary focus remains on severe weather potential for this evening.
At the surface, a warm front reinforced by clouds and light
precipitation this morning is evident in observations and visible
satellite imagery - stretching from just south of Kirksville
intersecting a cold front near Omaha. This cold front has made
gradual eastward progress, now stretching from eastern Nebraska to
near Russell Kansas. Agitated cumulus field has evolved along and
ahead of the cold front. The environment is characterized by
relatively modest vertical wind shear, but strong instability in
place. Robust convection is expected to develop by mid to late
afternoon across southeast Nebraska into far northeast Kansas.
Uncertainty with respect to thunderstorm coverage and timing exists
on the convective evolution as storm cold pools begin to consolidate
just before sunset. The most likely scenario is a forward
propagating line/cluster of storms quickly diving southeastward
through the forecast area this evening. In this case, a risk for
straight-line wind damage of wind gusts from 60-70 mph will exist
with this activity over northeast Kansas into northwest Missouri.
The time window for the greatest severe weather potential will be
from 7 to 11 PM. A less likely scenario will be for storms to
struggle to develop a cohesive cold pool, and likewise new
convection favoring the southwest flank of activity, with
propagation along the instability axis. This would favor storms
more across eastern Kansas, with the forecast area being
essentially split. Regardless, the odds are more likely that a
cluster of storms will move through the forecast area, producing
the potential for wind damage. Folks should be weather-aware this
evening.

For the remainder of the week, thunderstorm chances will begin to
decrease. Tuesday should be mainly rain-free, with a slight chance
of convection on Wednesday as isentropic ascent occurs with the
surface warm front lifting northward. Thereafter, heights rise as an
upper level ridge builds through the central CONUS. This will spell
a low probability of rainfall and high temperatures returning into
the 90s Thursday into the weekend.

&&

.Aviation...(For the 00Z TAFS through 00Z Tuesday Evening)
Issued at 642 PM CDT MON JUN 11 2018

VFR conditions will start the evening, but a line of thunderstorms
is expected to blow through later tonight bringing some trouble to
the terminals. Current timing has the storms moving through
between 02Z and 05Z. These storms will likely result in a strong
winds from the northwest as they blow through along with heavy
rain. Otherwise, expect some marginal MVFR CIGs Tuesday morning
behind the cold front that moves through overnight.

&&

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

Discussion...Blair
Aviation...Cutter

Hazardous weather outlook, Jun 11, 5:15 AM CDT, 15 hours 43 minutes before

Hazardous Weather Outlook
National Weather Service Kansas City/Pleasant Hill MO
515 AM CDT Mon Jun 11 2018

KSZ025-057-060-102>105-MOZ001>008-011>017-020>025-028>033-037>040-
043>046-053-054-121015-
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-
515 AM CDT Mon Jun 11 2018

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

.DAY ONE...Today and Tonight

 Hot conditions are expected today with highs in the low to mid 90s
 band heat index values in the mid 90 to low 100 degree range.

 Severe storms are possible west of Interstate 35 this evening into
 tonight. Damaging winds and large hail will be the main threats.

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

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

 Thunderstorms will be possible again Wednesday night a few strong to
 isolated severe storms may be possible.

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

In the hours before

Local storm report, Jun 11, 4:40 PM CDT, 4 hours 18 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
440 PM CDT MON JUN 11 2018

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

0950 PM     TSTM WND DMG     ETHEL                   39.90N 92.73W
06/08/2018                   MACON              MO   CO-OP OBSERVER

            DELAYED REPORT: MULTIPLE TREES DOWN,
            ESTIMATED WINDS 60MPH.

&&

JRB

Local storm report, Jun 11, 8:14 PM CDT, 44 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
814 PM CDT MON JUN 11 2018

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

0812 PM     TSTM WND GST     TARKIO                  40.44N 95.37W
06/11/2018  E60 MPH          ATCHISON           MO   STORM CHASER

&&

LAFLIN

Local storm report, Jun 11, 8:17 PM CDT, 41 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
817 PM CDT MON JUN 11 2018

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

0815 PM     TSTM WND GST     4 ENE CORNING           40.26N 95.37W
06/11/2018  E60 MPH          ATCHISON           MO   TRAINED SPOTTER

&&

LAFLIN

Local storm report, Jun 11, 8:28 PM CDT, 30 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
828 PM CDT MON JUN 11 2018

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

0818 PM     TSTM WND DMG     TARKIO                  40.44N 95.37W
06/11/2018                   ATCHISON           MO   911 CALL CENTER

            TREES UPROOTED.

&&

LAFLIN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 11, 7:38 PM CDT	Severe Thunderstorm Warning	EAX	Atchison, Holt, Nodaway	37 min
Jun 11, 8:14 PM CDT	Severe Thunderstorm Warning	EAX	Atchison, Holt, Nodaway	46 min
Jun 11, 9:28 PM CDT	Severe Thunderstorm Warning	EAX	Andrew, Buchanan, DeKalb, Gentry, Holt, Nodaway	32 min
Jun 11, 9:34 PM CDT	Special Weather Statement	EAX	Harrison	26 min
Jun 11, 9:51 PM CDT	Severe Thunderstorm Warning	EAX	Andrew, Buchanan, Clinton, Daviess, DeKalb, Gentry and 1 more	24 min
Jun 11, 9:57 PM CDT	Special Weather Statement	EAX	Daviess, Mercer	48 min
Jun 11, 10:10 PM CDT	Severe Thunderstorm Warning	EAX	Buchanan, Caldwell, Clinton, Daviess, DeKalb, Platte	35 min
Jun 11, 10:12 PM CDT	Severe Thunderstorm Warning	EAX	Buchanan, Platte	33 min
Jun 11, 10:27 PM CDT	Special Weather Statement	EAX	Grundy, Livingston, Putnam, Sullivan	48 min
Jun 11, 10:44 PM CDT	Severe Thunderstorm Warning	EAX	Caldwell, Carroll, Clay, Clinton, Platte, Ray	31 min
Jun 11, 10:47 PM CDT	Severe Thunderstorm Warning	EAX	Platte	28 min
Jun 11, 10:51 PM CDT	Special Weather Statement	EAX	Carroll, Linn, Livingston	39 min
Jun 11, 11:03 PM CDT	Severe Thunderstorm Warning	EAX	Carroll, Clay, Jackson, Lafayette, Platte, Ray	27 min
Jun 11, 11:15 PM CDT	Severe Thunderstorm Warning	EAX	Platte	30 min
Jun 11, 11:25 PM CDT	Special Weather Statement	EAX	Carroll, Chariton, Linn	50 min
Jun 11, 11:30 PM CDT	Severe Thunderstorm Warning	EAX	Carroll, Clay, Jackson, Johnson, Lafayette, Ray	30 min
Jun 11, 11:45 PM CDT	Severe Thunderstorm Warning	EAX	Platte	30 min
Jun 12, 12:07 AM CDT	Special Weather Statement	EAX	Cass, Jackson, Johnson, Lafayette	23 min
Jun 12, 12:20 AM CDT	Special Weather Statement	EAX	Cass, Cooper, Henry, Johnson, Pettis	55 min
Jun 12, 12:42 AM CDT	Severe Thunderstorm Warning	EAX	Bates, Cass	33 min
Jun 12, 1:14 AM CDT	Special Weather Statement	EAX	Bates, Cass	61 min
Jun 12, 1:15 AM CDT	Special Weather Statement	EAX	Henry	30 min
Jun 12, 1:46 AM CDT	Severe Thunderstorm Warning	EAX	Bates	44 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2018 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.