Alert archive / Kansas / Areal Flood Advisories in 2021

Areal Flood Advisory 19, NWS Kansas City, MO

July 7, 2021Jackson County, Missouri; Johnson County, Wyandotte County, Kansas

NWS Kansas City, MO issued this areal flood advisory at Jul 7, 2021, 4:02 PM CDT for Jackson County, Missouri; Johnson County, Wyandotte County, Kansas. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Jul 7, 2021, 4:02 PM CDT (21:02 UTC)
Expired: Jul 7, 2021, 6:34 PM CDT
In force: 3 hr
Issued by: NWS Kansas City, MO
Area: Storm-based polygon

Counties Johnson County, KS, Wyandotte County, KS, Jackson County, MO

The radar

The Pleasant Hill radar (KEAX), 39 km from the middle of the area, began a volume at 21:01 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, 9.0 hours before the alert went out and 86 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: 12 J/kg
Mixed-layer CIN: -129 J/kg
Mixed-layer LCL: 1621 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 112 m²/s²
0-3 km storm-relative helicity: 109 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood advisory 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 areal flood advisory went out at Jul 7, 3:59 PM CDT, 3 minutes earlier.

Area forecast discussion, Jul 7, 3:59 PM CDT, 3 minutes before

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Hazardous weather outlook, Jul 7, 5:12 AM CDT, 10 hours 50 minutes before

Hazardous Weather Outlook
National Weather Service Kansas City/Pleasant Hill MO
512 AM CDT Wed Jul 7 2021

KSZ025-057-060-102>105-MOZ001>008-011>017-020>025-028>033-037>040-
043>046-053-054-081015-
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-
512 AM CDT Wed Jul 7 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

Scattered showers and thunderstorms through the day. No severe
weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

Friday night, a complex of strong to severe thunderstorms is
forecast to develop over portions of Iowa and Nebraska and move into
northern Missouri and northeastern Kansas late Friday night into
Saturday morning. There is a slight risk of severe storms across
northern Missouri and northeastern Kansas. Damaging wind gusts are
the primary forecast concern at this time.

Heavy rainfall is forecast across the area with this system Friday
night through Saturday. The heaviest rainfall is forecast to occur
across northern Missouri, where upwards of 2 to 3 inches of
widespread rainfall may occur. Upwards of an inch to 2 inches is
forecast for central and western Missouri and eastern Kansas.

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

In the hours before

Special weather statement, Jul 7, 1:58 PM CDT, 2 hours 4 minutes before

Special Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
158 PM CDT Wed Jul 7 2021

MOZ024-071930-
Linn MO-
158 PM CDT Wed Jul 7 2021

...SIGNIFICANT WEATHER ADVISORY FOR LINN COUNTY UNTIL 230 PM CDT...

At 157 PM CDT, Doppler radar was tracking a strong thunderstorm over
Meadville, or 10 miles west of Brookfield, moving northeast at 20
mph.

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

Locations impacted include...
Brookfield, Marceline, Meadville, Laclede, Linneus, Purdin and Saint
Catherine.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3970 9287 3971 9320 3970 9320 3970 9335
      3979 9337 3983 9336 4002 9307
TIME...MOT...LOC 1857Z 234DEG 15KT 3975 9328

CDB

Special weather statement, Jul 7, 3:26 PM CDT, 36 minutes before

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Special weather statement, Jul 7, 3:45 PM CDT, 17 minutes before

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Special weather statement, Jul 7, 3:56 PM CDT, 6 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 7, 1:58 PM CDT	Special Weather Statement	EAX	Linn	32 min
Jul 7, 3:45 PM CDT	Special Weather Statement	EAX	Linn	45 min
Jul 7, 3:56 PM CDT	Special Weather Statement	EAX	Jackson	49 min
Jul 7, 4:26 PM CDT	Areal Flood Advisory	EAX	Linn, Livingston	4 hr
Jul 7, 4:31 PM CDT	Special Weather Statement	EAX	Jackson	44 min
Jul 7, 3:26 PM CDT	Special Weather Statement	EAX	Wyandotte	34 min

Nearby

Areal Flood Advisories in Kansas, 2021 Areal Flood Advisories in Missouri, 2021 Every areal flood advisory 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.