Alert archive / Kansas / Flash Flood Warnings in 2009

Flash Flood Warning 2, NWS Kansas City, MO

April 25, 2009Leavenworth County, Kansas

NWS Kansas City, MO issued this flash flood warning at Apr 25, 2009, 11:27 PM CDT for Leavenworth County, Kansas. It was in force for 98 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 25, 2009, 11:27 PM CDT (04:27 UTC)
Expired: Apr 26, 2009, 1:05 AM CDT
In force: 98 min
Issued by: NWS Kansas City, MO
Area: Storm-based polygon
Flood severity: None

County Leavenworth County, KS

The radar

The Pleasant Hill radar (KEAX), 73 km from the middle of the area, began a volume at 04:26 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 00:00Z, 4.5 hours before the alert went out and 51 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: 421 J/kg
Mixed-layer CIN: -157 J/kg
Mixed-layer LCL: 554 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 298 m²/s²
0-3 km storm-relative helicity: 389 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 10.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS53 KEAX 260427
FFWEAX
KSC103-260830-
/O.NEW.KEAX.FF.W.0002.090426T0427Z-090426T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
1127 PM CDT SAT APR 25 2009

THE NATIONAL WEATHER SERVICE IN PLEASANT HILL HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN LEAVENWORTH COUNTY IN NORTHEAST KANSAS...

* UNTIL 330 AM CDT

* AT 1125 PM CDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED FLASH 
  FLOODING ON TONGANOXIE CREEK IN TONGANOXIE. A WATER RESCUE HAS 
  BEEN ONGOING SINCE 10:45 PM.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...BASEHOR...
  TONGANOXIE AND LINWOOD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. DO
NOT ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND TO
ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN
WATER BEGINS RISING.

&&

LAT...LON 3914 9517 3916 9491 3900 9490 3899 9501
      3899 9502 3898 9517

$$

MJ

1 follow-up statement

000 
WGUS73 KEAX 260605
FFSEAX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
105 AM CDT SUN APR 26 2009

KSC103-260620-
/O.CAN.KEAX.FF.W.0002.000000T0000Z-090426T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LEAVENWORTH KS-
105 AM CDT SUN APR 26 2009

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR SOUTHERN
LEAVENWORTH COUNTY IS CANCELLED...

EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS
AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO
RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED...
PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY.

IF FLOODING WAS OBSERVED PLEASE RELAY YOUR REPORT TO LOCAL LAW 
ENFORCEMENT OR TO THE NATIONAL WEATHER SERVICE IN PLEASANT HILL.

&&

LAT...LON 3914 9517 3916 9491 3900 9490 3899 9501
      3899 9502 3898 9517

$$

MJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 25, 8:00 PM CDT	Special Weather Statement	EAX	Leavenworth	30 min
Apr 25, 8:20 PM CDT	Severe Thunderstorm Warning	EAX	Leavenworth	25 min
Apr 25, 8:35 PM CDT	Tornado Warning	EAX	Leavenworth	25 min
Apr 25, 8:57 PM CDT	Severe Thunderstorm Warning	EAX	Leavenworth	29 min
Apr 26, 1:38 AM CDT	High Wind Warning	EAX	Johnson, Linn, Miami	109 min

Nearby

Flash Flood Warnings in Kansas, 2009 Every flash flood warning in 2009

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.