Alert archive / Kansas / Flash Flood Watches in 2021
Flash Flood Watch 1, NWS Kansas City, MO
NWS Kansas City, MO issued this flash flood watch at May 20, 2021, 2:40 PM CDT for 7 counties in Kansas; 5 counties in Missouri. It took effect at May 20, 2021, 4:00 PM CDT. It was in force for 5 hr.
The area
The counties it named.
The facts
- Issued
- May 20, 2021, 2:40 PM CDT (19:40 UTC)
- In effect from
- May 20, 2021, 4:00 PM CDT
- Expired
- May 20, 2021, 8:43 PM CDT
- In force
- 5 hr
- Issued by
- NWS Kansas City, MO
- Flood severity
- None
Counties Atchison County, KS, Doniphan County, KS, Johnson County, KS, Leavenworth County, KS, Linn County, KS, Miami County, KS, Wyandotte County, KS, Andrew County, MO, Buchanan County, MO, Holt County, MO, Nodaway County, MO, Platte County, MO
The radar
The Pleasant Hill radar (KEAX), 87 km from the middle of the area, began a volume at 19:42 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, 7.7 hours before the alert went out and 75 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 584 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 76 m²/s²
- 0-3 km storm-relative helicity
- 59 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
625 WGUS63 KEAX 201940 FFAEAX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Kansas City/Pleasant Hill MO 240 PM CDT Thu May 20 2021 KSZ025-057-060-102>105-MOZ002-011-012-020-028-211100- /O.NEW.KEAX.FF.A.0001.210520T2100Z-210521T1100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Atchison KS-Miami-Linn KS-Doniphan-Leavenworth-Wyandotte- Johnson KS-Nodaway-Holt-Andrew-Buchanan-Platte- Including the cities of Atchison, Paola, Osawatomie, Louisburg, Pleasanton, La Cygne, Mound City, Wathena, Elwood, Troy, Highland, Fort Leavenworth, Leavenworth, Lansing, Kansas City Kansas, Overland Park, Stanley, Olathe, Shawnee, Lenexa, Maryville, Oregon, Maitland, Forest City, Craig, Savannah, Country Club Villa, St. Joseph Airport, St. Joseph, Parkville, Platte City, Riverside, Weatherby Lake, and Weston 240 PM CDT Thu May 20 2021 ...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT... The National Weather Service in Kansas City/Pleasant Hill has issued a * Flash Flood Watch for portions of Kansas and Missouri, including the following areas, in Kansas, Atchison KS, Doniphan, Johnson KS, Leavenworth, Linn KS, Miami, and Wyandotte. In Missouri, Andrew, Buchanan, Holt, Nodaway, and Platte. * Through late tonight * Showers and thunderstorms with localized heavy rainfall are expected this afternoon and this evening across parts of eastern Kansas and northwestern Missouri. This may lead to localized areas of 1.5 to 3 inches of rain, on top of already saturated grounds. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a VERY DANGEROUS SITUATION. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$
1 follow-up statement
461 WGUS63 KEAX 210143 FFAEAX Flood Watch National Weather Service Kansas City/Pleasant Hill MO 843 PM CDT Thu May 20 2021 KSZ025-057-060-102>105-MOZ002-011-012-020-028-210245- /O.CAN.KEAX.FF.A.0001.000000T0000Z-210521T1100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Atchison KS-Miami-Linn KS-Doniphan-Leavenworth-Wyandotte- Johnson KS-Nodaway-Holt-Andrew-Buchanan-Platte- Including the cities of Atchison, Paola, Osawatomie, Louisburg, Pleasanton, La Cygne, Mound City, Wathena, Elwood, Troy, Highland, Fort Leavenworth, Leavenworth, Lansing, Kansas City Kansas, Overland Park, Stanley, Olathe, Shawnee, Lenexa, Maryville, Oregon, Maitland, Forest City, Craig, Savannah, Country Club Villa, St. Joseph Airport, St. Joseph, Parkville, Platte City, Riverside, Weatherby Lake, and Weston 843 PM CDT Thu May 20 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of Kansas and Missouri has been cancelled. Significant rainfall amounts are no longer expected. $$
The office that day
Everything else NWS Kansas City, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 3:48 AM CDT | River Flood Warning | EAX | Atchison, Leavenworth | 42 hr |
| May 20, 3:18 PM CDT | River Flood Warning | EAX | Leavenworth | 15 hr |
Nearby
Flash Flood Watches in Kansas, 2021Flash Flood Watches in Missouri, 2021Every flash flood watch 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.