Alert archive / Missouri / Flash Flood Watches in 2019

Flash Flood Watch 16, NWS Kansas City, MO

September 27, 201922 counties in Missouri; 5 counties in Kansas

NWS Kansas City, MO issued this flash flood watch at Sep 27, 2019, 3:06 PM CDT for 22 counties in Missouri; 5 counties in Kansas. It took effect at Sep 27, 2019, 7:00 PM CDT. It was in force for 11 hr.

The area

The counties it named.

The facts

Issued
Sep 27, 2019, 3:06 PM CDT (20:06 UTC)
In effect from
Sep 27, 2019, 7:00 PM CDT
Expired
Sep 28, 2019, 5:34 AM CDT
In force
11 hr
Issued by
NWS Kansas City, MO
Flood severity
None
All 27 counties

Atchison County, KS, Doniphan County, KS, Johnson County, KS, Leavenworth County, KS, Wyandotte County, KS, Adair County, MO, Buchanan County, MO, Caldwell County, MO, Carroll County, MO, Chariton County, MO, Clay County, MO, Clinton County, MO, Daviess County, MO, DeKalb County, MO, Grundy County, MO, Jackson County, MO, Lafayette County, MO, Linn County, MO, Livingston County, MO, Macon County, MO, Platte County, MO, Putnam County, MO, Randolph County, MO, Ray County, MO, Saline County, MO, Schuyler County, MO, Sullivan County, MO

The radar

The Pleasant Hill radar (KEAX), 97 km from the middle of the area, began a volume at 20:07 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, 8.1 hours before the alert went out and 168 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 2019-09-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1169 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 2019-09-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 540 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
1169 J/kg
Mixed-layer CIN
-400 J/kg
Mixed-layer LCL
932 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
540 m²/s²
0-3 km storm-relative helicity
656 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.9

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 flash flood watch went out at Sep 27, 12:42 PM CDT, 2 hours 24 minutes earlier.

Area forecast discussion, Sep 27, 12:42 PM CDT, 2 hours 24 minutes before
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Hazardous weather outlook, Sep 27, 4:34 AM CDT, 10 hours 32 minutes before
Hazardous Weather Outlook
National Weather Service Kansas City/Pleasant Hill MO
434 AM CDT Fri Sep 27 2019

KSZ025-057-060-102>105-MOZ001>008-011>017-020>025-028>033-037>040-
043>046-053-054-280945-
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-
434 AM CDT Fri Sep 27 2019

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

.DAY ONE...Today and Tonight

 Severe storms are possible across the area this afternoon and
 evening along and behind a cold front. Hazards include the
 potential for strong winds and large hail.

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

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

 Isolated flash flooding is possible by Saturday morning, with
 additional severe storm chances possible Saturday afternoon and
 evening along a stalled frontal boundary. Hazards include the
 potential for strong winds and large hail, with continued flash
 flooding potential.

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

In the hours before

Special weather statement, Sep 27, 10:42 AM CDT, 4 hours 24 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Sep 27, 5:55 AM CDTSpecial Weather StatementEAXRandolph35 min
Sep 27, 6:01 AM CDTSpecial Weather StatementEAXSaline44 min
Sep 27, 6:43 AM CDTSpecial Weather StatementEAXChariton47 min
Sep 27, 10:42 AM CDTSpecial Weather StatementEAXAdair33 min
Sep 27, 5:29 PM CDTSpecial Weather StatementEAXAdair16 min
Sep 27, 5:53 PM CDTSpecial Weather StatementEAXAdair37 min
Sep 27, 5:57 PM CDTSevere Thunderstorm WarningEAXAdair33 min
Sep 27, 6:11 PM CDTSpecial Weather StatementEAXPlatte34 min
Sep 27, 6:17 PM CDTSevere Thunderstorm WarningEAXClay, Platte43 min
Sep 27, 6:35 PM CDTSevere Thunderstorm WarningEAXAdair, Macon25 min
Sep 27, 6:40 PM CDTSevere Thunderstorm WarningEAXHarrison, Mercer35 min
Sep 27, 6:47 PM CDTFlash Flood WarningEAXClay, Clinton, Platte3 hr
Sep 27, 6:59 PM CDTSevere Thunderstorm WarningEAXClay, Clinton, Platte46 min
Sep 27, 6:24 PM CDTSpecial Weather StatementEAXLeavenworth21 min

Nearby

Flash Flood Watches in Missouri, 2019Flash Flood Watches in Kansas, 2019Every flash flood watch in 2019

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.