Alert archive / Missouri / Special Weather Statements in 2017

Special Weather Statement, NWS Kansas City, MO

October 14, 2017Henry County, Missouri

NWS Kansas City, MO issued this special weather statement at Oct 14, 2017, 8:17 PM CDT for Henry County, Missouri. It was in force for 43 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Oct 14, 2017, 8:17 PM CDT (01:17 UTC)
Expired: Oct 14, 2017, 9:00 PM CDT
In force: 43 min
Issued by: NWS Kansas City, MO

County Henry County, MO

The radar

The Pleasant Hill radar (KEAX), 79 km from the middle of the area, began a volume at 01:17 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.

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 1.3 hours before the alert went out and 149 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: 306 J/kg
Mixed-layer CIN: -165 J/kg
Mixed-layer LCL: 1608 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 168 m²/s²
0-3 km storm-relative helicity: 310 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Oct 14, 6:33 PM CDT, 1 hour 44 minutes earlier.

Area forecast discussion, Oct 14, 6:33 PM CDT, 1 hour 44 minutes before

AREA FORECAST DISCUSSION
National Weather Service Kansas City/Pleasant Hill MO
633 PM CDT Sat Oct 14 2017

.Discussion...
Issued at 318 PM CDT SAT OCT 14 2017

Analysis and short range guidance continue to paint an ominous
couple of hours this afternoon and early this evening. A strong
upper shortwave trough is moving through the Rockies currently.
Strong mid to upper level flow ahead of this wave is helping to
produce 0-6km shear of 50 to 60 kts, mainly north of the surface
front. But this strong shear is expected to overspread the region
this evening. At the surface, the front is draped from central KS
through NW MO and southern IA. Ongoing convection in northern KS/MO,
aided by the LLJ, has helped to keep that area clouded and more
stable. But south of the cloud cover, temperatures are in the 80s
with dewpoints in the upper 60s and lower 70s. This highly
anomalous warm and moist environment is already yielding 1500 to
2500 J/kg SBCAPE. Forecast soundings show this to be capped still
so it will take the forcing of the front, which is very strong, to
help force the convection later this afternoon. Models forecast
the front to be moving into the northwestern portion of the
forecast area this afternoon and advance quickly southeastward as
the forcing from the upper wave encroaches upon the area.
Convection is likely to develop over central KS, along/ahead of
the front and then quickly track eastward into what should be a
very favorable environment for severe thunderstorms with CAPE in
the 2000 to 2500 J/KG range and 0-6km shear of 50+ kts. Even with
winds veered to the south-southwest, helicity values are in the
200 to 250 m^2/s^2 range and may even be higher. Forecast
hodographs show strong curvature in the 0-3 km range with much of
this in the 0-1km depth. 0-3km shear of 30 to 40 kts from west to
east favors mesovortex generation within any QLCS. Given the
strong shear, moderate instability and high helicity, tornadoes
look very possible from east central KS through central and
perhaps to northeastern MO. This would be in initial supercell
stages and also after the storms form into a QLCS. Also, given the
strong winds throughout the atmosphere, damaging winds look
likely. Additionally, with supercells or supercells within a line,
large will be possible.

The front that will force all of this activity should quickly move
through the forecast area. Have sped up the exit of the precipitation
tonight to match short-range model trends. Also, winds will increase
quite a bit in the wake of the front. Have increased winds to the 20
to 30 mph range with higher gusts. For now, I don't anticipate wind
advisory level winds, but there could be a few wind gusts of 40 mph
given the strong downward momentum behind the front. Winds should
decrease by sunrise as the area of potential vorticity shifts
eastward. But it will still be windy with temperatures struggling to
reach 60 degrees across the area.

The rest of the forecast looks dry with temperatures climbing into
the low to middle 70s, which is about 5 degrees above normal for
this time of year.

&&

.Aviation...(For the 00Z TAFS through 00Z Sunday Evening)
Issued at 633 PM CDT SAT OCT 14 2017

Pre-front thunderstorms pushed through the terminals in the past
couple of hours. The actual cold front will move through later
this evening and might bring a secondary round of thunderstorms,
though this second line will likely be more scattered in nature.
Expect gusty northwest winds behind the front later tonight, with
northwest winds persisting through Sunday.

&&

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

Discussion...CDB
Aviation...Cutter

Hazardous weather outlook, Oct 14, 4:56 AM CDT, 15 hours 21 minutes before

Hazardous Weather Outlook
National Weather Service Kansas City/Pleasant Hill MO
456 AM CDT Sat Oct 14 2017

KSZ025-057-060-102>105-MOZ001>008-011>017-020>025-028>033-037>040-
043>046-053-054-151000-
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-
456 AM CDT Sat Oct 14 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

A chance of thunderstorms will be possible this morning generally
north of the Interstate 70 corridor.

Additional thunderstorms will develop this afternoon and evening
along a cold front, and spread across the outlook area. Severe
weather will be possible, with damaging wind gusts the greatest
hazard, along with some potential for large hail and isolated
tornadoes.

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

.DAYS TWO THROUGH SEVEN...Sunday through Friday

No hazardous weather is expected at this time.

In the hours before

Local storm report, Oct 14, 7:13 PM CDT, 1 hour 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
713 PM CDT SAT OCT 14 2017

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

0613 PM     TSTM WND GST     GREENWOOD               38.85N 94.34W
10/14/2017  E65 MPH          JACKSON            MO   NWS EMPLOYEE

&&

Special weather statement, Oct 14, 7:40 PM CDT, 37 minutes before

Special Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
740 PM CDT SAT OCT 14 2017

MOZ033-150115-
Randolph MO-
740 PM CDT SAT OCT 14 2017

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL RANDOLPH COUNTY UNTIL 815
PM CDT...

At 740 PM CDT, Doppler radar was tracking a strong thunderstorm over
Moberly, moving east at 50 mph.

Wind gusts up to 50 mph will be possible with this storm.

Locations impacted include...
Moberly, Huntsville and Cairo.

A tornado watch remains in effect until 100 AM CDT for central and
north central Missouri.

LAT...LON 3931 9267 3951 9257 3958 9230 3937 9231
TIME...MOT...LOC 0040Z 255DEG 44KT 3945 9245

CDB

Special weather statement, Oct 14, 7:42 PM CDT, 35 minutes before

Special Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
742 PM CDT SAT OCT 14 2017

MOZ039-040-150115-
Saline MO-Howard MO-
742 PM CDT SAT OCT 14 2017

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL HOWARD AND SOUTHEASTERN
SALINE COUNTIES UNTIL 815 PM CDT...

At 741 PM CDT, Doppler radar was tracking a strong thunderstorm 7
miles south of Slater, moving east at 50 mph.

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

Locations impacted include...
Fayette, Glasgow, Armstrong and Arrow Rock.

A tornado watch remains in effect until 100 AM CDT for central and
north central Missouri.

LAT...LON 3902 9292 3906 9294 3901 9300 3900 9308
      3917 9314 3923 9291 3922 9289 3924 9286
      3923 9285 3925 9284 3930 9261 3908 9252
TIME...MOT...LOC 0041Z 255DEG 44KT 3911 9302

CDB

Local storm report, Oct 14, 7:52 PM CDT, 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
752 PM CDT SAT OCT 14 2017

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

0728 PM     TSTM WND DMG     1 E MOUND CITY          38.14N 94.81W
10/14/2017                   LINN               KS   TRAINED SPOTTER

            SHINGLES BLOWN OFF ROOF. ALSO REPORTED
            MULTIPLE POWER OUTAGES ACROSS LINN COUNTY.

&&

JW

Local storm report, Oct 14, 8:02 PM CDT, 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
802 PM CDT SAT OCT 14 2017

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

0726 PM     TSTM WND DMG     5 S MOUND CITY          38.07N 94.81W
10/14/2017                   LINN               KS   TRAINED SPOTTER

            MULTIPLE TREES DOWN AT 300 RD AND K-7
            HIGHWAY. TIME ESTIMATED TO RADAR.

&&

JW

Special weather statement, Oct 14, 8:17 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
817 PM CDT SAT OCT 14 2017

MOZ054-150200-
Henry MO-
817 PM CDT SAT OCT 14 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN HENRY COUNTY UNTIL 900
PM CDT...

At 816 PM CDT, Doppler radar was tracking a strong thunderstorm over
Montrose, or 14 miles southwest of Clinton, moving east at 45 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Clinton, Deepwater, Montrose, Coal, Brownington, Tightwad, La Due and
Truman Lake.

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.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

A tornado watch remains in effect until 100 AM CDT for west central
Missouri.

LAT...LON 3821 9394 3822 9408 3834 9407 3837 9352
      3821 9352 3821 9354 3822 9356 3822 9357
      3820 9356
TIME...MOT...LOC 0116Z 270DEG 39KT 3825 9400

Leighton/Barham

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 14, 7:06 PM CDT	Severe Thunderstorm Warning	EAX	Bates, Cass	39 min
Oct 14, 7:40 PM CDT	Special Weather Statement	EAX	Randolph	35 min
Oct 14, 7:42 PM CDT	Special Weather Statement	EAX	Howard	33 min
Oct 14, 7:47 PM CDT	Severe Thunderstorm Warning	EAX	Bates, Henry	28 min
Oct 14, 8:37 PM CDT	Special Weather Statement	EAX	Pettis	53 min
Oct 14, 8:43 PM CDT	Severe Thunderstorm Warning	EAX	Cooper, Pettis, Saline	47 min
Oct 14, 9:01 PM CDT	Areal Flood Advisory	EAX	Johnson, Lafayette, Pettis, Saline	3 hr
Oct 14, 9:04 PM CDT	Severe Thunderstorm Warning	EAX	Cooper, Howard	41 min
Oct 14, 11:51 PM CDT	River Flood Warning	EAX	Atchison, Holt	31 hr
Oct 15, 1:08 AM CDT	River Flood Warning	EAX	Johnson, Pettis	34 hr
Oct 15, 1:29 AM CDT	River Flood Warning	EAX	Cass, Henry, Johnson	48 hr
Oct 15, 8:10 AM CDT	River Flood Warning	EAX	Cooper, Saline	3 days
Oct 15, 12:28 PM CDT	Frost Advisory	EAX	Andrew, Atchison, Gentry, Holt, Nodaway, Worth	20 hr

Nearby

Special Weather Statements in Missouri, 2017 Every special weather statement 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.