Alert archive / Nebraska / Flash Flood Warnings in 2002

Flash Flood Warning 4, NWS North Platte, NE

July 6, 2002Perkins County, Nebraska

NWS North Platte, NE issued this flash flood warning at Jul 6, 2002, 6:41 PM MDT for Perkins County, Nebraska. It was in force for 3 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: Jul 6, 2002, 6:41 PM MDT (00:41 UTC)
Expired: Jul 6, 2002, 9:45 PM MDT
In force: 3 hr
Issued by: NWS North Platte, NE
Area: Counties, with a storm outline in the text

County Perkins County, NE

The radar

The North Platte radar (KLNX), 159 km from the middle of the area, began a volume at 00:42 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, 0.7 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-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: 539 J/kg
Mixed-layer CIN: -47 J/kg
Mixed-layer LCL: 1545 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -16 m²/s²
0-3 km storm-relative helicity: 18 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.

000 
WGUS53 KLBF 070041
FFWLBF
NEC135-070345-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
640 PM MDT SAT JUL 6 2002

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  PERKINS COUNTY IN SOUTHWEST NEBRASKA...

* UNTIL 945 PM MDT...

* AT 637 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
VERY HEAVY RAIN OVER GRANT...MOVING NORTHEAST AT 20 MPH.

* LOCATIONS IN THE WARNING INCLUDE BRANDON...ELSIE AND GRAINTON

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...NORMALLY DRY WASHES AND
ARROYOS...AS WELL AS FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODS AND FLASH FLOODS. 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.

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

LAT...LON 4071 10203 4071 10127 4099 10128 4099 10203

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 7:46 PM MDT	Flash Flood Warning	LBF	Keith	3 hr
Jul 7, 4:29 PM MDT	Severe Thunderstorm Warning	LBF	Cherry	61 min
Jul 7, 5:50 PM MDT	Severe Thunderstorm Warning	LBF	Sheridan	40 min

Nearby

Flash Flood Warnings in Nebraska, 2002 Every flash flood warning in 2002

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.