Alert archive / Nebraska / Flash Flood Warnings in 2011

Flash Flood Warning 13, NWS North Platte, NE

July 8, 2011Chase County, Perkins County, Nebraska

NWS North Platte, NE issued this flash flood warning at Jul 8, 2011, 8:50 PM MDT for Chase County, Perkins County, Nebraska. It was in force for 6 hr. 2 reports 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
Jul 8, 2011, 8:50 PM MDT (02:50 UTC)
Expired
Jul 9, 2011, 3:00 AM MDT
In force
6 hr
Issued by
NWS North Platte, NE
Area
Storm-based polygon
Flood severity
None

Counties Chase County, NE, Perkins County, NE

The radar

The Goodland radar (KGLD), 144 km from the middle of the area, began a volume at 02:54 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

TimeReportWhereRemark
Jul 8, 10:40 PM MDTFLASH FLOOD7 Sw Brandon, NETHREE FEET OF WATER REPORTED IN VENANGO. WATER HAS DAMAGED SOME RESIDENCES.
Jul 8, 10:40 PM MDTHEAVY RAIN 5.57 Sw Brandon, NERAINFALL MEASUREMENT OF 5.50 INCHES BY A FIREMAN IN VENANGO.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 2.8 hours before the alert went out and 101 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-pSkew-T log-p diagram, N. Platte/Lee Bi, NE at 00:00Z on 2011-07-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1154 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, N. Platte/Lee Bi, NE at 00:00Z on 2011-07-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 109 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1154 J/kg
Mixed-layer CIN
-66 J/kg
Mixed-layer LCL
1374 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
109 m²/s²
0-3 km storm-relative helicity
273 m²/s²
Significant tornado parameter
0.5
Supercell composite
10.0

Open this sounding in Storm Lab

The text

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

354 
WGUS53 KLBF 090250
FFWLBF
NEC029-135-090900-
/O.NEW.KLBF.FF.W.0013.110709T0250Z-110709T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
850 PM MDT FRI JUL 8 2011

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN CHASE COUNTY IN SOUTHWEST NEBRASKA...
  SOUTHERN PERKINS COUNTY IN SOUTHWEST NEBRASKA...

* UNTIL 300 AM MDT SATURDAY

* AT 848 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE
  WARNED AREA. RAINFALL EXCEEDING THREE INCHES HAS BEEN INDICATED 
  BY RADAR AND RAINFALL OF 2.6 INCHES WAS REPORTED AT THE FIRE 
  STATION IN VENANGO IN AN HOUR OR LESS.  

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  GRANT...IMPERIAL...BRANDON...ELSIE...GRAINTON...LAMAR...MADRID AND
  VENANGO.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS EXCEEDING TWO INCHES ARE POSSIBLE IN THE 
WARNED AREA.

&&

LAT...LON 4048 10206 4090 10207 4090 10125 4070 10125
      4070 10138 4048 10135

$$

SPRINGER
1 follow-up statement
868 
WGUS73 KLBF 090357
FFSLBF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
957 PM MDT FRI JUL 8 2011

NEC029-135-090900-
/O.CON.KLBF.FF.W.0013.000000T0000Z-110709T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHASE NE-PERKINS NE-
957 PM MDT FRI JUL 8 2011

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR PERKINS AND NORTHERN
CHASE COUNTIES UNTIL 300 AM MDT...

AT 956 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. RADAR 
ESTIMATES INDICATE THAT RAINFALL SO FAR HAS EXCEEDED FOUR INCHES 
THIS EVENING.

RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLASH FLOODING INCLUDE...
GRANT...IMPERIAL...BRANDON...ELSIE...GRAINTON...LAMAR...MADRID AND
VENANGO.



PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF AN INCH OR TWO ARE POSSIBLE IN THE 
WARNED AREA.

&&

LAT...LON 4048 10206 4090 10207 4090 10125 4070 10125
      4070 10138 4048 10135

$$

SPRINGER

The office that day

Everything else NWS North Platte, NE issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 8, 7:06 PM MDTAreal Flood AdvisoryLBFArthur, Garden6 hr
Jul 8, 8:26 PM MDTSevere Thunderstorm WarningLBFPerkins49 min
Jul 8, 8:44 PM MDTFlash Flood WarningLBFLogan, McPherson, Thomas2 min

Nearby

Flash Flood Warnings in Nebraska, 2011Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.