Alert archive / Kansas / Flash Flood Warnings in 2021
Flash Flood Warning 1, NWS Kansas City, MO
NWS Kansas City, MO issued this flash flood warning at Apr 28, 2021, 2:55 PM CDT for Leavenworth County, Wyandotte County, Kansas. It was in force for 3 hr. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Apr 28, 2021, 2:55 PM CDT (19:55 UTC)
- Expired
- Apr 28, 2021, 6:00 PM CDT
- In force
- 3 hr
- Issued by
- NWS Kansas City, MO
- Area
- Storm-based polygon
- Flood severity
- None
Counties Leavenworth County, KS, Wyandotte County, KS
The radar
The Pleasant Hill radar (KEAX), 67 km from the middle of the area, began a volume at 19:56 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 28, 3:05 PM CDT | FLASH FLOOD | 5 Nne Linwood, KS | WATER OVER THE HEMPHILL RD. HAS SINCE RECEDED. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Topeka, KS (KTOP), launched 12:00Z, 7.9 hours before the alert went out and 57 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
- 986 J/kg
- Mixed-layer CIN
- -48 J/kg
- Mixed-layer LCL
- 592 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 168 m²/s²
- 0-3 km storm-relative helicity
- 167 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.1
The text
As transmitted.
928
WGUS53 KEAX 281955
FFWEAX
KSC103-209-282300-
/O.NEW.KEAX.FF.W.0001.210428T1955Z-210428T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Kansas City/Pleasant Hill MO
255 PM CDT Wed Apr 28 2021
The National Weather Service in Pleasant Hill MO has issued a
* Flash Flood Warning for...
Southern Leavenworth County in northeastern Kansas...
Northwestern Wyandotte County in northeastern Kansas...
* Until 600 PM CDT.
* At 255 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2 inches of rain
have fallen. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Shawnee, Leavenworth, Lansing, Bonner Springs, De Soto,
Tonganoxie, Basehor, Edwardsville, Kansas City, Linwood, Reno,
Fairmount, Piper, Maywood and Wolcott.
This includes the following highways...
Kansas Turnpike between mile markers 206 and 226.
Interstate 435 between mile markers 13 and 19.
Interstate 70 in Kansas between mile markers 410 and 411.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3908 9519 3927 9484 3922 9483 3920 9478
3918 9476 3906 9485 3905 9488 3901 9489
3899 9491 3898 9492 3900 9492 3898 9496
3900 9501 3898 9503 3899 9507 3898 9509
3895 9509 3898 9516 3896 9519
FLASH FLOOD...RADAR INDICATED
$$
Atkins1 follow-up statement
768
WGUS73 KEAX 282255
FFSEAX
Flash Flood Statement
National Weather Service Kansas City/Pleasant Hill MO
555 PM CDT Wed Apr 28 2021
KSC103-209-282305-
/O.EXP.KEAX.FF.W.0001.000000T0000Z-210428T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Leavenworth KS-Wyandotte KS-
555 PM CDT Wed Apr 28 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 6 PM CDT THIS EVENING FOR
SOUTHERN LEAVENWORTH AND NORTHWESTERN WYANDOTTE COUNTIES...
Flood waters have receded. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 3908 9519 3927 9484 3922 9483 3920 9478
3918 9476 3906 9485 3905 9488 3901 9489
3899 9491 3898 9492 3900 9492 3898 9496
3900 9501 3898 9503 3899 9507 3898 9509
3895 9509 3898 9516 3896 9519
$$
73The office that day
Everything else NWS Kansas City, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 28, 2:30 PM CDT | Special Weather Statement | EAX | Leavenworth, Wyandotte | 45 min |
| Apr 28, 4:48 PM CDT | Areal Flood Advisory | EAX | Miami | 3 hr |
Nearby
Flash Flood Warnings in Kansas, 2021Every flash flood warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.