Alert archive / Nebraska / Flash Flood Warnings in 2007

Flash Flood Warning 31, NWS North Platte, NE

June 12, 2007Perkins County, Nebraska

NWS North Platte, NE issued this flash flood warning at Jun 12, 2007, 1:23 AM MDT for Perkins County, Nebraska. It took effect at Jun 12, 2007, 1:28 AM MDT. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 12, 2007, 1:23 AM MDT (07:23 UTC)
In effect from
Jun 12, 2007, 1:28 AM MDT
Expired
Jun 12, 2007, 5:30 AM MDT
In force
4 hr
Issued by
NWS North Platte, NE
Area
Whole counties

County Perkins County, NE

The radar

The North Platte radar (KLNX), 152 km from the middle of the area, began a volume at 07:26 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

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 7.4 hours before the alert went out and 93 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 2007-06-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2552 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 2007-06-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 70 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
2552 J/kg
Mixed-layer CIN
-75 J/kg
Mixed-layer LCL
1479 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
70 m²/s²
0-3 km storm-relative helicity
149 m²/s²
Significant tornado parameter
0.0
Supercell composite
7.6

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KLBF 120728
FFWLBF
NEC135-121130-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
123 AM MDT TUE JUN 12 2007

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  PERKINS COUNTY IN SOUTHWEST NEBRASKA...
  THIS INCLUDES THE CITY OF GRANT...

* UNTIL 530 AM MDT

* AT 117 AM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
FLASH FLOODING FROM THUNDERSTORMS OVER THE WARNED AREA. SCATTERED 
THUNDERSTORMS WILL CONTINUE TO MOVE ACROSS AREAS FLOODED EARLIER 
TONIGHT. LESS THAN AN INCH OF RAIN IN AN HOUR WILL PRODUCE FLOODING.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 
VENANGO...BRANDON...GRAINTON.

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES IS POSSIBLE IN THE 
WARNED AREA.

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. UNPAVED ROADS AND SOME SECONDARY ROADS 
MAY BE STRUCTURALLY UNSAFE FOR TRAVEL. TRAVEL IS NOT ADVISED ACROSS 
SOUTHWEST PERKINS COUNTY WHERE UPWARDS TO 4 TO 6 INCHES OF RAIN HAS 
FALLEN. ALSO 2 TO 3 INCHES OF RAIN MAY HAVE FALLEN ACROSS FAR 
SOUTHEAST PERKINS COUNTY SOUTH OF GRAINTON.

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

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE
POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL ACROSS
FLOODED ROADS. FIND ALTERNATE ROUTES. IT TAKES ONLY A FEW INCHES OF
SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN NORTH
PLATTE.

LAT...LON 4071 10203 4070 10125 4099 10126 4099 10204

$$

CDC
3 follow-up statements
000 
WGUS73 KLBF 120850
FFSLBF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
343 AM CDT TUE JUN 12 2007

NEC135-121130-
PERKINS NE-
243 AM MDT TUE JUN 12 2007

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 AM MDT FOR
PERKINS COUNTY...

AT 239 AM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE SCATTERED TO NUMEROUS THUNDERSTORMS PRODUCING HEAVY 
RAINFALL ACROSS PARTS OF WESTERN PERKINS COUNTY. STRONGEST STORMS 
WILL BE CAPABLE OF RAINFALL RATES NEAR 1 INCH PER HOUR.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 
GRANT...BRANDON AND VENANGO.

THROUGH 530 AM MDT...ADDITIONAL RAINFALL OF 1 TO 3 INCHES IS LIKELY 
IN THE WARNED AREA AS STORMS CONTINUE TO TRACK ACROSS AREAS ALREADY 
WET OR FLOODED FROM HEAVY RAIN EARLIER TONIGHT.

TRAVEL IS DISCOURAGED ON ANY COUNTY OR SECONDARY ROADS FOR THE 
REMAINDER OF TONIGHT...AS ROADS MAY BE UNDERWATER OR IMPASSABLE DUE 
TO WASHOUTS OR STRUCTURAL PROBLEMS. 

FLOOD WATERS ARE LIKELY MOVING DOWN SPRING CREEK AND SAND CREEK 
SOUTH OF BRANDON AND EAST OF VENANGO. THE DEPTH OF THESE WATERS IS 
UNCERTAIN BUT RADAR ESTIMATES OVER 6 INCHES OF RAINFALL HAS FALLEN 
IN THIS AREA. THIS WILL LIKELY PRODUCE EXTENSIVE LOWLAND FLOODING.

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

LAT...LON 4071 10203 4070 10125 4099 10126 4099 10204

$$

CDC
000 
WGUS73 KLBF 121033
FFSLBF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
529 AM CDT TUE JUN 12 2007

NEC135-121130-
PERKINS NE-
429 AM MDT TUE JUN 12 2007

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 AM MDT FOR
PERKINS COUNTY...

AT 423 AM MDT...ALL INDICATIONS ARE THE HEAVY RAIN HAS ENDED AND NO 
SIGNIFICANT RAINFALL IS EXPECTED FOR SEVERAL HOURS THIS MORNING. 
ANOTHER POWERFUL UPPER LEVEL DISTURBANCE WILL BE APPROACHING 
SOUTHWEST NEBRASKA LATER THIS MORNING OR THIS AFTERNOON AND MORE 
HEAVY RAINFALL COULD DEVELOP.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WILD HORSE 
SPRING...VENANGO...BRANDON...GRANT AND MADRID WHERE 6 INCHES OF RAIN 
MAY HAVE FALLEN.

ADDITIONAL RAINFALL AMOUNTS OF 1/4 INCH OR LESS IS POSSIBLE EARLY 
THIS MORNING IN THE WARNED AREA.

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.

FLOOD WATERS ARE LIKELY MOVING DOWN SPRING CREEK AND SAND CREEK 
SOUTH OF BRANDON AND EAST OF VENANGO. THE DEPTH OF THESE WATERS IS 
UNCERTAIN BUT RADAR ESTIMATES OVER 6 INCHES OF RAINFALL HAS FALLEN 
IN THIS AREA. THIS WILL LIKELY PRODUCE EXTENSIVE LOWLAND FLOODING.

MOST FLOOD RELATED DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO 
CROSS WATER COVERED BRIDGES...DIPS...OR LOW WATER CROSSINGS. NEVER 
TRY TO CROSS A FLOWING STREAM...EVEN A SMALL ONE...ON FOOT. TO 
ESCAPE RISING WATER MOVE UP TO HIGHER GROUND.

TRAVEL COULD BE HAZARDOUS ON COUNTY OR SECONDARY ROADS THIS MORNING. 
AS ROADS MAY BE UNDERWATER OR IMPASSABLE DUE TO WASHOUTS OR 
STRUCTURAL PROBLEMS. 

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN NORTH
PLATTE.

LAT...LON 4071 10203 4070 10125 4099 10126 4099 10204

$$

CDC
000 
WGUS73 KLBF 121134
FFSLBF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
632 AM CDT TUE JUN 12 2007

NEC135-121142-
PERKINS NE-
532 AM MDT TUE JUN 12 2007

...THE FLASH FLOOD WARNING HAS EXPIRED FOR PERKINS COUNTY...

THE THREAT OF HEAVY RAIN AND FLOODING HAS ENDED FOR NOW. HEAVY RAIN 
COULD REDEVELOP LATER TODAY.

USE CAUTION TRAVELING THIS MORNING. THE STRUCTURAL INTEGRITY OF SOME 
ROADS EXPOSED TO RUSHING FLOOD WATERS LAST NIGHT MAY BE COMPROMISED. 
THIS MEANS SLOW DOWN UNLESS YOUR CERTAIN THE ROAD IS SAFE.

LAT...LON 4071 10203 4070 10125 4099 10126 4099 10204

$$

CDC

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 11, 6:28 PM MDTSevere Thunderstorm WarningLBFChase62 min
Jun 11, 7:01 PM MDTFlash Flood WarningLBFChase119 min
Jun 11, 7:11 PM MDTFlash Flood WarningLBFChase, Hayes6 hr
Jun 11, 8:34 PM MDTSevere Thunderstorm WarningLBFPerkins41 min
Jun 11, 9:31 PM MDTFlash Flood WarningLBFPerkins4 hr
Jun 12, 12:00 AM MDTSevere Thunderstorm WarningLBFChase60 min
Jun 12, 12:17 AM MDTTornado WarningLBFChase43 min
Jun 12, 1:10 AM MDTFlash Flood WarningLBFChase6 hr
Jun 12, 2:39 AM MDTFlash Flood WatchLBFArthur, Blaine, Boyd, Brown, Chase, Cherry and 20 more48 hr
Jun 12, 6:54 AM MDTFlash Flood WarningLBFChase4 hr
Jun 12, 11:19 AM MDTFlash Flood WarningLBFChase, Perkins6 hr
Jun 12, 11:41 AM MDTSevere Thunderstorm WarningLBFCherry34 min
Jun 12, 12:23 PM MDTSevere Thunderstorm WarningLBFKeith40 min
Jun 12, 1:28 PM MDTFlash Flood WarningLBFKeith6 hr
Jun 12, 1:46 PM MDTSevere Thunderstorm WarningLBFLincoln30 min
Jun 12, 2:43 PM MDTFlash Flood WarningLBFHayes6 hr
Jun 12, 3:22 PM MDTFlash Flood WarningLBFLincoln6 hr
Jun 12, 3:29 PM MDTSevere Thunderstorm WarningLBFLincoln61 min

Nearby

Flash Flood Warnings in Nebraska, 2007Every flash flood warning in 2007

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.