Alert archive / Kansas / Flash Flood Warnings in 2021
Flash Flood Warning 19, NWS Topeka, KS
NWS Topeka, KS issued this flash flood warning at Jun 30, 2021, 11:39 AM CDT for Coffey County, Lyon County, Kansas. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jun 30, 2021, 11:39 AM CDT (16:39 UTC)
- Expired
- Jun 30, 2021, 2:00 PM CDT
- In force
- 2 hr
- Issued by
- NWS Topeka, KS
- Area
- Storm-based polygon
- Flood severity
- None
Counties Coffey County, KS, Lyon County, KS
The radar
The Topeka radar (KTWX), 93 km from the middle of the area, began a volume at 16:43 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, 4.7 hours before the alert went out and 95 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
- 247 J/kg
- Mixed-layer CIN
- -22 J/kg
- Mixed-layer LCL
- 653 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 21 m²/s²
- 0-3 km storm-relative helicity
- 21 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
108
WGUS53 KTOP 301639
FFWTOP
KSC031-111-301900-
/O.NEW.KTOP.FF.W.0019.210630T1639Z-210630T1900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Topeka KS
1139 AM CDT Wed Jun 30 2021
The National Weather Service in Topeka has issued a
* Flash Flood Warning for...
Southwestern Coffey County in east central Kansas...
Southeastern Lyon County in east central Kansas...
* Until 200 PM CDT.
* At 1138 AM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Up to 1.5 inches of rain have
fallen. Additional rainfall amounts up to 2 inches are possible in
the warned area. 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...
Burlington, Gridley and John Redmond Reservoir.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 3817 9614 3829 9613 3830 9576 3810 9575
3809 9596 3817 9596
FLASH FLOOD...RADAR INDICATED
$$
531 follow-up statement
671
WGUS73 KTOP 301855
FFSTOP
Flash Flood Statement
National Weather Service Topeka KS
155 PM CDT Wed Jun 30 2021
KSC031-111-301905-
/O.EXP.KTOP.FF.W.0019.000000T0000Z-210630T1900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Coffey KS-Lyon KS-
155 PM CDT Wed Jun 30 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 2 PM CDT THIS AFTERNOON FOR
SOUTHWESTERN COFFEY AND SOUTHEASTERN LYON COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
A Flash Flood Watch remains in effect until 700 AM CDT Thursday for
portions of east central Kansas and northeast Kansas.
LAT...LON 3817 9614 3829 9613 3830 9576 3810 9575
3809 9596 3817 9596
$$
53The office that day
Everything else NWS Topeka, KS issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 30, 5:04 AM CDT | Areal Flood Advisory | TOP | Lyon, Morris | 116 min |
| Jun 30, 6:30 AM CDT | Areal Flood Advisory | TOP | Osage, Shawnee, Wabaunsee | 3 hr |
| Jun 30, 7:38 AM CDT | Areal Flood Advisory | TOP | Douglas, Franklin, Osage | 2 hr |
| Jun 30, 8:37 AM CDT | Flash Flood Warning | TOP | Douglas | 2 hr |
| Jun 30, 12:36 PM CDT | Areal Flood Advisory | TOP | Anderson, Coffey, Franklin, Osage | 4 hr |
| Jun 30, 2:19 PM CDT | Areal Flood Advisory | TOP | Douglas, Jefferson, Morris, Osage, Shawnee, Wabaunsee | 3 hr |
| Jun 30, 3:31 PM CDT | River Flood Warning | TOP | Franklin, Osage | 23 hr |
| Jun 30, 6:35 PM CDT | Areal Flood Warning | TOP | Anderson, Coffey | 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.