Alert archive / Missouri / Flash Flood Warnings in 2011

Flash Flood Warning 18, NWS Kansas City, MO

June 20, 2011Holt County, Missouri

NWS Kansas City, MO issued this flash flood warning at Jun 20, 2011, 9:45 AM CDT for Holt County, Missouri. It was in force for 24 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 20, 2011, 9:45 AM CDT (14:45 UTC)
Expired: Jun 21, 2011, 9:30 AM CDT
In force: 24 hr
Issued by: NWS Kansas City, MO
Area: Storm-based polygon
Flood severity: None

County Holt County, MO

The radar

The Topeka radar (KTWX), 146 km from the middle of the area, began a volume at 14:55 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, 2.8 hours before the alert went out and 129 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: 1300 J/kg
Mixed-layer CIN: -726 J/kg
Mixed-layer LCL: 1759 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 473 m²/s²
0-3 km storm-relative helicity: 559 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

474 
WGUS53 KEAX 201445
FFWEAX
MOC087-211430-
/O.NEW.KEAX.FF.W.0018.110620T1445Z-110621T1430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
945 AM CDT MON JUN 20 2011

THE NATIONAL WEATHER SERVICE IN PLEASANT HILL HAS ISSUED A

* FLASH FLOOD WARNING FOR LEVEE OVERTOPPING AND POTENTIAL LEVEE 
FAILURE IN...
  NORTHWESTERN HOLT COUNTY IN NORTHWEST MISSOURI...

* UNTIL 930 AM CDT TUESDAY

* AT 938 AM CDT...EMERGENCY MANAGEMENT REPORTED FLOODING ACROSS THE  
  WARNED AREA DUE TO FLOOD WATERS OVERTOPPING THE EAST LEVEE AT THE  
  MOUTH OF THE BIG TARKIO RIVER. THIS LEVEE IS LOCATED WEST OF       
  CRAIG...AND WATER OVERTOPPING THE LEVEE WILL AFFECT ROADS AND      
  RURAL AREAS OUTSIDE OF CRAIG AND THROUGH NORTH BIG LAKE. 

* EXTENSIVE FLOODING IS EXPECTED TO OCCUR OVER MAINLY RURAL AREAS OF 
  NORTHWESTERN HOLT COUNTY...INCLUDING THE TOWNS OF CRAIG AND BIG    
  LAKE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

STAY TUNED TO YOUR LOCAL MEDIA AND LAW ENFORCEMENT FOR THE LATEST 
FLOOD INFORMATION AND FORECASTS FROM THE NATIONAL WEATHER SERVICE 
FOR THE LATEST INFORMATION. YOU CAN ALSO VISIT THE NATIONAL WEATHER 
SERVICE WEB PAGE FOR THE LATEST DETAILS. WWW.WEATHER.GOV/KC

&&

LAT...LON 4026 9554 4026 9546 4019 9537 4012 9534
      4002 9532 4002 9539 4004 9542 4006 9542
      4007 9540 4012 9540 4014 9544 4016 9544
      4019 9549 4022 9547 4024 9548 4024 9552

$$

SAW

1 follow-up statement

471 
WGUS73 KEAX 211435
FFSEAX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
935 AM CDT TUE JUN 21 2011

MOC087-211447-
/O.EXP.KEAX.FF.W.0018.000000T0000Z-110621T1430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HOLT MO-
935 AM CDT TUE JUN 21 2011

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR NORTHWESTERN HOLT
COUNTY HAS BEEN ALLOWED TO EXPIRE...

FLOOD WATERS DUE TO LEVEE BREACHES AND LEVEE OVERTOPPING FROM THE 
MISSOURI RIVER HAVE LARGELY ALREADY COVERED MUCH OF THE WARNED AREA. 
EXTENSIVE FLOODING WILL CONTINUE ACROSS FAR WESTERN HOLT COUNTY FOR 
THE FORESEEABLE FUTURE...AND EMERGENCY MANAGEMENT OFFICIALS URGE 
ANY PERSONS STILL RESIDING NEAR THE MISSOURI RIVER FLOOD ZONE WEST 
OF INTERSTATE 29 TO EVACUATE AS SOON AS POSSIBLE. 

LAT...LON 4026 9554 4026 9546 4019 9537 4012 9534
      4002 9532 4002 9539 4004 9542 4006 9542
      4007 9540 4012 9540 4014 9544 4016 9544
      4019 9549 4022 9547 4024 9548 4024 9552

$$

21

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 19, 9:41 PM CDT	Tornado Warning	EAX	Atchison	34 min
Jun 19, 9:42 PM CDT	Tornado Warning	EAX	Nodaway	33 min
Jun 19, 10:11 PM CDT	Tornado Warning	EAX	Atchison	34 min
Jun 19, 10:13 PM CDT	Severe Thunderstorm Warning	EAX	Nodaway	32 min
Jun 19, 10:49 PM CDT	Special Weather Statement	EAX	Worth	26 min
Jun 20, 1:54 AM CDT	Special Weather Statement	EAX	Schuyler	36 min
Jun 20, 2:02 AM CDT	Special Weather Statement	EAX	Atchison	13 min
Jun 20, 2:24 AM CDT	Special Weather Statement	EAX	Andrew, Gentry, Nodaway	36 min
Jun 20, 3:19 AM CDT	Special Weather Statement	EAX	Daviess	26 min
Jun 20, 3:23 AM CDT	Special Weather Statement	EAX	Gentry	37 min
Jun 20, 3:06 PM CDT	Flash Flood Watch	EAX	Atchison, Gentry, Harrison, Mercer, Nodaway, Putnam and 2 more	9 hr

Nearby

Flash Flood Warnings in Missouri, 2011 Every flash flood warning in 2011

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.