Alert archive / Missouri / Special Weather Statements in 2017

Special Weather Statement, NWS Kansas City, MO

August 21, 2017Clay County, Missouri

NWS Kansas City, MO issued this special weather statement at Aug 21, 2017, 3:34 PM CDT for Clay County, Missouri. It was in force for 26 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
Aug 21, 2017, 3:34 PM CDT (20:34 UTC)
Expired
Aug 21, 2017, 4:00 PM CDT
In force
26 min
Issued by
NWS Kansas City, MO

County Clay County, MO

The radar

The Pleasant Hill radar (KEAX), 59 km from the middle of the area, began a volume at 20:34 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

Topeka, KS (KFOE), launched 12:00Z, 8.6 hours before the alert went out and 113 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, Topeka, KS at 12:00Z on 2017-08-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 942 joules per kilogram.LCLLFCEL10008507005003002001001 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, Topeka, KS at 12:00Z on 2017-08-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -19 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
942 J/kg
Mixed-layer CIN
-160 J/kg
Mixed-layer LCL
913 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
-19 m²/s²
0-3 km storm-relative helicity
90 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 Aug 21, 12:40 PM CDT, 2 hours 54 minutes earlier.

Area forecast discussion, Aug 21, 12:40 PM CDT, 2 hours 54 minutes before
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Hazardous weather outlook, Aug 21, 3:15 AM CDT, 12 hours 19 minutes before
Hazardous Weather Outlook
National Weather Service Kansas City/Pleasant Hill MO
315 AM CDT Mon Aug 21 2017

KSZ025-057-060-102>105-MOZ001>008-011>017-020>025-028>033-037>040-
043>046-053-054-220815-
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-
315 AM CDT Mon Aug 21 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

 Multiple rounds of thunderstorms are possible this afternoon and
 this evening, some which could become strong to severe. Strong
 winds, hail and perhaps even an isolated tornado are possible with
 the afternoon round especially along and north of Highway 36, and
 strong winds are possible with the late evening-overnight round
 throughout the outlook area.

 In addition to the severe threat, flooding will be a concern this
 evening and tonight throughout the outlook area. Several inches of
 rain are possible, and may fall very rapidly in stronger storms.

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

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

 No hazardous weather is expected at this time.

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

In the hours before

Local storm report, Aug 21, 3:27 PM CDT, 7 minutes before
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Local storm report, Aug 21, 3:31 PM CDT, 3 minutes before
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Local storm report, Aug 21, 3:32 PM CDT, 2 minutes before
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Local storm report, Aug 21, 3:33 PM CDT, 1 minute before
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Local storm report, Aug 21, 3:34 PM CDT, 0 minutes before
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Special weather statement, Aug 21, 3:34 PM CDT, 0 minutes before
Special Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
334 PM CDT MON AUG 21 2017

MOZ029-037-212100-
Jackson MO-Clay MO-
334 PM CDT MON AUG 21 2017

...SIGNIFICANT WEATHER ADVISORY FOR CLAY AND NORTHWESTERN JACKSON
COUNTIES UNTIL 400 PM CDT...

At 334 PM CDT, Doppler radar was tracking a strong thunderstorm near
Pleasant Valley, or near Claycomo, moving northeast at 30 mph.

Half inch hail and wind gusts up to 50 mph will be possible with this
storm.

Locations impacted include...
Kansas City, Liberty, Gladstone, Excelsior Springs, Kearney, North
Kansas City, Sugar Creek, Lawson, Claycomo, Pleasant Valley,
Glenaire, Avondale, Oakview, Missouri City, River Bend, Mosby,
Oakwood Park, Oakwood, Birmingham and Oaks.

This includes the following highways...
 Interstate 35 in Missouri between mile markers 6 and 30.
 Interstate 29 between mile markers 0 and 2.
 Interstate 435 between mile markers 40 and 55.

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 3946 9427 3945 9422 3921 9421 3913 9458
      3928 9461 3931 9460
TIME...MOT...LOC 2034Z 239DEG 27KT 3926 9450

CDB

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 21, 2:49 PM CDTAreal Flood AdvisoryEAXClay, Platte4 hr
Aug 21, 3:18 PM CDTAreal Flood AdvisoryEAXCaldwell, Clay, Clinton, Ray3 hr
Aug 21, 3:45 PM CDTFlash Flood WarningEAXCaldwell, Clay, Clinton, Platte, Ray4 hr
Aug 21, 4:10 PM CDTSpecial Weather StatementEAXClay35 min
Aug 21, 4:19 PM CDTSevere Thunderstorm WarningEAXClay, Platte26 min
Aug 21, 4:43 PM CDTSpecial Weather StatementEAXChariton47 min
Aug 21, 4:48 PM CDTRiver Flood WarningEAXClay, Ray47 hr
Aug 21, 5:12 PM CDTSpecial Weather StatementEAXChariton, Randolph63 min
Aug 21, 5:46 PM CDTSevere Thunderstorm WarningEAXPettis, Saline44 min
Aug 21, 6:23 PM CDTSevere Thunderstorm WarningEAXCooper37 min

Nearby

Special Weather Statements in Missouri, 2017Every 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.