Alert archive / Nebraska / Flash Flood Warnings in 2008

Flash Flood Warning 2, NWS North Platte, NE

May 23, 2008Lincoln County, Nebraska

NWS North Platte, NE issued this flash flood warning at May 23, 2008, 2:00 PM CDT for Lincoln County, Nebraska. It was in force for 6 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: May 23, 2008, 2:00 PM CDT (19:00 UTC)
Expired: May 23, 2008, 8:00 PM CDT
In force: 6 hr
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Flood severity: None

County Lincoln County, NE

The radar

The North Platte radar (KLNX), 108 km from the middle of the area, began a volume at 19:01 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
May 23, 7:50 PM CDT	FLASH FLOOD	Brady, NE	EMERGENCY MANAGER REPORTED SEVERAL COUNTY ROADS CLOSED DUE TO FLASH FLOODING AND HEAVY RAIN. THESE ROAD CLOSURES INCLUDED EFFENBECK...BRADY/MOOREFIELD 14 MILES SOUTH OF JEFFREY RESERVOIR...FOX CREEK ROAD AND CUT CREEK ROAD.

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, 7.0 hours before the alert went out and 20 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: 143 J/kg
Mixed-layer CIN: -139 J/kg
Mixed-layer LCL: 510 m above ground
0-6 km bulk shear: 79 kt
0-1 km storm-relative helicity: 292 m²/s²
0-3 km storm-relative helicity: 253 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KLBF 231902
FFWLBF
NEC111-240100-
/O.NEW.KLBF.FF.W.0002.080523T1900Z-080524T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
200 PM CDT FRI MAY 23 2008

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

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

* UNTIL 800 PM CDT

* AT 157 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  FLASH FLOODING FROM THUNDERSTORMS MOVING NORTH OVER THE WARNED     
  AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO COTTONWOOD
  CANYON STATE WILDLIFE MANAGEMENT AREA...MAXWELL AND BRADY

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.

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

LAT...LON 4070 10077 4139 10070 4139 10023 4104 10023
      4104 10021 4069 10021
TIME...MOT...LOC 1900Z 180DEG 0KT 4096 10045

$$

GARNER

1 follow-up statement

000 
WGUS73 KLBF 232207
FFSLBF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
507 PM CDT FRI MAY 23 2008

NEC111-240100-
/O.CON.KLBF.FF.W.0002.000000T0000Z-080524T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LINCOLN NE-
507 PM CDT FRI MAY 23 2008

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 800 PM CDT FOR
EASTERN LINCOLN COUNTY...

AT 503 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A THUNDERSTORM PRODUCING FLASH FLOODING OVER THE WARNED
AREA.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO COTTONWOOD
CANYON STATE WILDLIFE MANAGEMENT AREA...MAXWELL AND BRADY

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

LAT...LON 4070 10077 4139 10070 4139 10023 4104 10023
      4104 10021 4069 10021
TIME...MOT...LOC 2207Z 180DEG 0KT 4096 10045

$$

GARNER

The office that day

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

Issued	Product	Office	Counties	Lasted
May 22, 8:06 PM CDT	Tornado Warning	LBF	Frontier	39 min
May 23, 3:55 AM CDT	Flash Flood Watch	LBF	Chase, Custer, Frontier, Hayes, Keith, Lincoln and 1 more	24 hr
May 23, 8:07 AM CDT	Flash Flood Warning	LBF	Frontier, Hayes, Lincoln	9 hr
May 23, 2:26 PM CDT	Severe Thunderstorm Warning	LBF	Frontier	49 min
May 23, 3:13 PM CDT	Severe Thunderstorm Warning	LBF	Frontier	47 min
May 23, 3:18 PM CDT	Tornado Warning	LBF	Frontier	27 min
May 23, 4:03 PM CDT	Severe Thunderstorm Warning	LBF	Frontier, Lincoln	42 min
May 23, 4:15 PM CDT	Wind Advisory	LBF	Arthur, Chase, Cherry, Deuel, Frontier, Garden and 10 more	10 hr
May 23, 4:31 PM CDT	Severe Thunderstorm Warning	LBF	Custer	29 min
May 23, 4:44 PM CDT	Severe Thunderstorm Warning	LBF	Frontier, Lincoln	46 min
May 23, 5:02 PM CDT	Flash Flood Warning	LBF	Frontier, Hayes	6 hr

Nearby

Flash Flood Warnings in Nebraska, 2008 Every flash flood warning in 2008

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.