Alert archive / Nebraska / Flash Flood Warnings in 2009

Flash Flood Warning 4, NWS North Platte, NE

July 22, 2009Frontier County, Nebraska

NWS North Platte, NE issued this flash flood warning at Jul 22, 2009, 5:19 PM CDT for Frontier County, Nebraska. It was in force for 3 hr. 1 report 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 22, 2009, 5:19 PM CDT (22:19 UTC)
Expired: Jul 22, 2009, 8:15 PM CDT
In force: 3 hr
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Flood severity: None

County Frontier County, NE

The radar

The Grand Island radar (KUEX), 141 km from the middle of the area, began a volume at 22:21 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

Time	Report	Where	Remark
Jul 22, 7:34 PM CDT	FLASH FLOOD	3 S Eustis, NE	SHERIFF REPORTED WATER OVER EAST CANYON AND MIDDLE CANYON ROAD 3 TO 7 MILES SOUTH OF EUSTIS AND IMPASSABLE. AS OF 730 PM CDT EAST CANYON ROAD REMAINED IMPASSABLE TO CARS.

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 12:00Z, 10.3 hours before the alert went out and 87 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: 78 J/kg
Mixed-layer CIN: -187 J/kg
Mixed-layer LCL: 1482 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 91 m²/s²
0-3 km storm-relative helicity: 163 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KLBF 222219
FFWLBF
NEC063-230115-
/O.NEW.KLBF.FF.W.0004.090722T2219Z-090723T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
519 PM CDT WED JUL 22 2009

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN FRONTIER COUNTY IN SOUTHWEST NEBRASKA...

* UNTIL 815 PM CDT

* AT 517 PM CDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED SOME      
  MINOR FLOODING ON COUNTY ROADS SOUTH OF EUSTIS. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO EUSTIS AND 
  LOCATIONS ACROSS THE EASTERN QUARTER OF FRONTIER COUNTY. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF ONE TO TWO INCHES ARE POSSIBLE IN THE 
WARNED AREA.

IN HILLY TERRAIN THERE ARE NUMEROUS 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.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

&&

LAT...LON 4034 10021 4067 10028 4068 9997 4044 9997
      4044 9999 4043 10007 4036 10007 4035 10008

$$

BUTTLER

2 follow-up statements

000 
WGUS73 KLBF 230041
FFSLBF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
741 PM CDT WED JUL 22 2009

NEC063-230115-
/O.CON.KLBF.FF.W.0004.000000T0000Z-090723T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
FRONTIER NE-
741 PM CDT WED JUL 22 2009

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 815 PM CDT FOR
EASTERN FRONTIER COUNTY...

AT 738 PM CDT...LOCAL LAW ENFORCEMENT REPORTED THAT EAST CANYON ROAD 
3 TO 7 MILES SOUTH OF EUSTIS WAS IMPASSIBLE TO CARS IN SPOTS. THE 
WATER IS RECEDING FAIRLY QUICKLY AND THE ROAD IS EXPECTED TO BE 
PASSABLE BY 815 PM CDT. 

EARLIER IN THE EVENING...MIDDLE CANYON ROAD WAS COVERED WITH 
WATER...WHICH HAS SINCE RECEDED. 

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO LOCATIONS 
SOUTH OF EUSTIS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT
WEDNESDAY EVENING FOR SOUTHWEST NEBRASKA.

&&

LAT...LON 4034 10021 4067 10028 4068 9997 4044 9997
      4044 9999 4043 10007 4036 10007 4035 10008

$$

BUTTLER

000 
WGUS73 KLBF 230130
FFSLBF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
830 PM CDT WED JUL 22 2009

NEC063-230145-
/O.EXP.KLBF.FF.W.0004.000000T0000Z-090723T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
FRONTIER NE-
830 PM CDT WED JUL 22 2009

...THE FLASH FLOOD WARNING FOR EASTERN FRONTIER COUNTY ALLOWED TO EXPIRE...

AT 815 PM CDT...THE THREAT FOR FLASH FLOODING HAD ENDED ACROSS 
FRONTIER COUNTY.

&&

LAT...LON 4034 10021 4067 10028 4068 9997 4044 9997
      4044 9999 4043 10007 4036 10007 4035 10008

$$

BUTTLER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 22, 2:21 PM CDT	Severe Thunderstorm Warning	LBF	Deuel, Keith, Perkins	39 min
Jul 22, 3:16 PM CDT	Severe Thunderstorm Warning	LBF	Chase, Perkins	59 min
Jul 22, 3:34 PM CDT	Severe Thunderstorm Warning	LBF	Lincoln	56 min
Jul 22, 3:49 PM CDT	Severe Thunderstorm Warning	LBF	Custer, Lincoln, Logan	56 min
Jul 22, 4:06 PM CDT	Severe Thunderstorm Warning	LBF	Chase	54 min
Jul 22, 4:11 PM CDT	Severe Thunderstorm Warning	LBF	Frontier, Lincoln	64 min
Jul 22, 5:10 PM CDT	Severe Thunderstorm Warning	LBF	Frontier	50 min
Jul 22, 5:23 PM CDT	Severe Thunderstorm Warning	LBF	Lincoln, Logan, McPherson	52 min
Jul 22, 5:33 PM CDT	Severe Thunderstorm Warning	LBF	Custer	27 min

Nearby

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