Alert archive / Missouri / Special Weather Statements in 2021

Special Weather Statement, NWS Kansas City, MO

May 27, 2021Clay County, Missouri

NWS Kansas City, MO issued this special weather statement at May 27, 2021, 6:11 PM CDT for Clay County, Missouri. It was in force for 34 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
May 27, 2021, 6:11 PM CDT (23:11 UTC)
Expired
May 27, 2021, 6:45 PM CDT
In force
34 min
Issued by
NWS Kansas City, MO

County Clay County, MO

The radar

The Pleasant Hill radar (KEAX), 48 km from the middle of the area, began a volume at 23:12 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 (KTOP), launched 12:00Z, 11.2 hours before the alert went out and 106 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 2021-05-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3 joules per kilogram.LCLLFCEL10008507005003002001001 km2 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 2021-05-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -3 square meters per square second.19395878Sfc1 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
3 J/kg
Mixed-layer CIN
-459 J/kg
Mixed-layer LCL
1511 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
-3 m²/s²
0-3 km storm-relative helicity
343 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 May 27, 2:28 PM CDT, 3 hours 43 minutes earlier.

Area forecast discussion, May 27, 2:28 PM CDT, 3 hours 43 minutes before
AREA FORECAST DISCUSSION
National Weather Service Kansas City/Pleasant Hill MO
228 PM CDT Thu May 27 2021

.Discussion...
Issued at 220 PM CDT THU MAY 27 2021

Key messages:

- Scattered showers and thunderstorms are likely to develop again
  this afternoon. A few storms could be strong to severe, with
  wind gusts up to 60 mph and hail up to the size of half dollars
  being the primary threats.

- Localized moderate to heavy rainfall will be possible with these
  storms. A flash flood watch is in effect until 7 pm for areas
  south and southeast of the KC metro where up to 3 inches of rain
  fell earlier today.

- Much cooler than normal temperatures will persist through the
  holiday weekend and into the first few days of June.

Discussion:

The cold front is currently draped across northwest MO into
northeastern KS and slowly making its way to the southeast.
Towering cumulus and showers are beginning to develop along and
ahead of this cold front, with scattered thunderstorms expected to
develop by around 3 to 4 pm and move to the southeast through the
remainder of the afternoon and early evening hours. Some clearing
behind this mornings convection has allowed for some modest
destabilization to occur, so a few storms could be strong to
perhaps marginally severe, with strong wind gusts up to 60 mph and
hail up to the size of half dollars being the primary threats.
Localized moderate to heavy rainfall will also be possible, and a
flash flood watch is in effect through 7 pm tonight for areas
south and southeast of the KC metro where up to 3 to even 4 inches
of rain fell earlier today.

Showers and storms should completely exit the region by late
evening, with low level stratus hanging through the overnight
period and low temperatures in the upper 40s to low 50s. Cloud
cover and cold air advection behind the cold front will lead to a
chilly Friday, with highs only expected to reach the mid 50s to
around 60 degrees. The record low high for KC for Friday's date
is 59 degrees, so that could potentially be threatened tomorrow
(forecast high as of now is 60 degrees).

Temperatures will warm a bit as we head into the holiday weekend,
although remaining below climatological normals, with highs
warming into the mid to upper 60s for Saturday through Monday.

A weak mid level impulse moves into the area Monday into Tuesday,
which will reintroduce chances for showers. Instability looks
marginal to nonexistent, so thunderstorms are not expected at this
time. As we enter into June and meteorological summer, high
temperatures will still only warm into the low 70s.

&&

.Aviation...(For the 18Z TAFS through 18Z Friday Afternoon)
Issued at 1248 PM CDT THU MAY 27 2021

Currently VFR at all terminals with some isolated showers in the
vicinity of the terminals. Winds have turned back to southeasterly
at all terminals except for STJ. Another round of scattered to
perhaps even widespread showers and thunderstorms are expected to
develop along and ahead of the approaching cold front this
afternoon, with the most likely time frame for these occurring between
20z and 23z (19z and 22z at STJ). Periods of lowered VSBY, heavy
rain, frequent lightning, gusty winds, and hail may be possible at
the terminals if impacted by a storm. Winds will shift to
northwesterly after the passage of the cold front. CIGs are
expected to lower to MVFR by around 10z Friday morning.

&&

.EAX WATCHES/WARNINGS/ADVISORIES...
KS...Flash Flood Watch until 7 PM CDT this evening for KSZ057-060.

MO...Flash Flood Watch until 7 PM CDT this evening for MOZ043>045-053-
     054.

&&

Discussion...BMW
Aviation...BMW
Hazardous weather outlook, May 27, 3:43 AM CDT, 14 hours 28 minutes before
Hazardous Weather Outlook
National Weather Service Kansas City/Pleasant Hill MO
343 AM CDT Thu May 27 2021

KSZ025-057-060-102>105-MOZ001>008-011>017-020>025-028>033-037>040-
043>046-053-054-280845-
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-
343 AM CDT Thu May 27 2021

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

.DAY ONE...Today and Tonight

Early morning storms are expected to move through the area producing
gusty winds and brief heavy rain. Additional storms are possible
this afternoon. Some of these storms may be strong to severe
producing wind gusts to 65 mph, large hail, locally heavy rainfall
and perhaps a tornado. The severe threat is expected to quickly
diminish towards sunset.

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

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Much cooler conditions are expected Friday night into the weekend.
Temperatures may fall into the upper 30s Friday night near the Iowa
Missouri border leading to areas of patchy frost.

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

In the hours before

Local storm report, May 27, 5:08 PM CDT, 1 hour 3 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
508 PM CDT THU MAY 27 2021

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

0504 PM     HAIL             4 SSW KEARNEY           39.31N 94.40W
05/27/2021  E1.50 INCH       CLAY               MO   PUBLIC

            CALLER PHONED INTO OFFICE REPORTING LARGE
            HAIL WHILE DRIVING NORTH ON I-35 TOWARDS
            KEARNEY.

&&

EMK
Local storm report, May 27, 5:35 PM CDT, 36 minutes before
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Local storm report, May 27, 6:02 PM CDT, 9 minutes before
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Local storm report, May 27, 6:07 PM CDT, 4 minutes before
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Local storm report, May 27, 6:08 PM CDT, 3 minutes before
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Special weather statement, May 27, 6:11 PM CDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
May 27, 1:20 AM CDTRiver Flood WarningEAXCarroll32 hr
May 27, 1:20 AM CDTRiver Flood WarningEAXCooper, Saline55 hr
May 27, 1:20 AM CDTRiver Flood WarningEAXCass, Henry, Johnson4 days
May 27, 1:20 AM CDTRiver Flood WarningEAXJohnson, Pettis39 hr
May 27, 3:15 AM CDTSpecial Weather StatementEAXAndrew45 min
May 27, 3:51 AM CDTSpecial Weather StatementEAXClay, Clinton39 min
May 27, 4:05 AM CDTSevere Thunderstorm WarningEAXCaldwell, Clinton, Daviess, DeKalb40 min
May 27, 4:26 AM CDTSpecial Weather StatementEAXCaldwell, Carroll49 min
May 27, 4:50 AM CDTSpecial Weather StatementEAXHenry40 min
May 27, 5:27 AM CDTSpecial Weather StatementEAXChariton, Linn, Macon, Sullivan48 min
May 27, 5:37 AM CDTSpecial Weather StatementEAXPettis38 min
May 27, 6:22 AM CDTRiver Flood WarningEAXClay, Ray27 hr
May 27, 6:28 AM CDTSpecial Weather StatementEAXPlatte32 min
May 27, 6:51 AM CDTSpecial Weather StatementEAXJackson39 min
May 27, 7:51 AM CDTAreal Flood AdvisoryEAXBates, Cass71 min
May 27, 8:31 AM CDTAreal Flood AdvisoryEAXHenry, Johnson, Pettis31 min
May 27, 9:02 AM CDTFlash Flood WarningEAXBates, Cass3 hr
May 27, 9:02 AM CDTFlash Flood WarningEAXHenry, Johnson, Pettis3 hr
May 27, 9:35 AM CDTRiver Flood WarningEAXBates, Cass, Henry56 hr
May 27, 10:50 AM CDTFlash Flood WatchEAXBates, Cass, Henry, Johnson, Pettis8 hr
May 27, 11:23 AM CDTRiver Flood WarningEAXBates4 days
May 27, 11:46 AM CDTAreal Flood WarningEAXHenry, Johnson, Pettis9 hr
May 27, 11:46 AM CDTAreal Flood WarningEAXBates, Cass9 hr
May 27, 12:25 PM CDTRiver Flood WarningEAXHoward8 hr
May 27, 12:25 PM CDTRiver Flood WarningEAXCooper19 hr
May 27, 4:50 PM CDTSpecial Weather StatementEAXClay40 min
May 27, 4:51 PM CDTAreal Flood AdvisoryEAXClay, Jackson, Platte3 hr
May 27, 5:05 PM CDTSevere Thunderstorm WarningEAXClay, Ray25 min
May 27, 5:40 PM CDTSevere Thunderstorm WarningEAXPlatte35 min
May 27, 5:55 PM CDTFlash Flood WarningEAXClay, Jackson, Platte3 hr
May 27, 5:58 PM CDTFlash Flood WarningEAXClay, Ray3 hr
May 27, 1:20 AM CDTRiver Flood WarningEAXAtchison, Leavenworth7 hr
May 27, 2:50 AM CDTSpecial Weather StatementEAXLeavenworth, Wyandotte40 min
May 27, 6:19 AM CDTSpecial Weather StatementEAXJohnson, Miami41 min
May 27, 9:49 AM CDTRiver Flood WarningEAXMiami3 days
May 27, 9:57 AM CDTRiver Flood WarningEAXLinn4 days
May 27, 4:08 PM CDTSpecial Weather StatementEAXWyandotte37 min
May 27, 5:14 PM CDTSevere Thunderstorm WarningEAXJohnson, Leavenworth, Wyandotte31 min

Nearby

Special Weather Statements in Missouri, 2021Every special weather statement in 2021

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.