Alert archive / Nebraska / Flash Flood Warnings in 2020

Flash Flood Warning 4, NWS North Platte, NE

July 10, 2020Cherry County, Nebraska

NWS North Platte, NE issued this flash flood warning at Jul 10, 2020, 8:10 PM MDT for Cherry County, Nebraska. It was in force for 3 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 10, 2020, 8:10 PM MDT (02:10 UTC)
Expired: Jul 10, 2020, 11:15 PM MDT
In force: 3 hr
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Flood severity: None

County Cherry County, NE

The radar

The North Platte radar (KLNX), 101 km from the middle of the area, began a volume at 02:08 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 10, 8:50 PM MDT	FLOOD	1 Nne Valentine, NE	0.82 INCHES OF RAIN IN 30 MINUTES PRODUCED MINOR FLOODING
Jul 10, 8:50 PM MDT	FLOOD	1 Nne Valentine, NE	0.82 INCHES OF RAIN IN 30 MINUTES PRODUCED MINOR FLOODING.

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, 2.2 hours before the alert went out and 190 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: 2032 J/kg
Mixed-layer CIN: -76 J/kg
Mixed-layer LCL: 1726 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 121 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 4.2

Open this sounding in Storm Lab

The text

As transmitted.

390 
WGUS53 KLBF 110210
FFWLBF
NEC031-110515-
/O.NEW.KLBF.FF.W.0004.200711T0210Z-200711T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service North Platte NE
910 PM CDT Fri Jul 10 2020

The National Weather Service in North Platte has issued a

* Flash Flood Warning for...
  Northern Cherry County in north central Nebraska...

* Until 1215 AM CDT/1115 PM MDT/.

* At 909 PM CDT/809 PM MDT/, Doppler radar indicated thunderstorms
  producing heavy rain across the warned area. Up to one inch of rain
  has already fallen. Flash flooding is already occurring.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar indicated.

  IMPACT...Flooding of small creeks and streams, urban areas, 
           highways, streets and underpasses as well as other 
           drainage and low lying areas.

* Some locations that will experience flooding include...
  Valentine, Cody, Merriman, Kilgore, Nenzel, Medicine Lake, Merritt
  Reservoir, Crookston, Wood Lake, Eli, Irwin, Rock Hill, Cody Lake,
  Anderson Bridge State Wildlife Management Area, Smith Falls State
  Park, Highway 97 crossing the Niobrara River, Indian Hill, Highway
  61 crossing the Snake River, Steer Creek Campground and Schoolhouse
  Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

&&

LAT...LON 4300 10020 4256 10018 4255 10207 4300 10208

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...2-3 INCHES IN 1 HOUR

$$

Kulik

1 follow-up statement

535 
WGUS73 KLBF 110400
FFSLBF

Flash Flood Statement
National Weather Service North Platte NE
1100 PM CDT Fri Jul 10 2020

NEC031-110515-
/O.CON.KLBF.FF.W.0004.000000T0000Z-200711T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cherry NE-
1100 PM CDT Fri Jul 10 2020

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1215 AM CDT/1115
PM MDT/ FOR NORTHERN CHERRY COUNTY...

At 1059 PM CDT/959 PM MDT/, Doppler radar indicated thunderstorms
producing heavy rain across the warned area. Up to two inches of rain
have already fallen. Flash flooding is already occurring.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar indicated.

IMPACT...Flooding of small creeks and streams, urban areas, 
         highways, streets and underpasses as well as other drainage 
         and low lying areas.

Some locations that will experience flooding include...
Valentine, Cody, Merriman, Kilgore, Nenzel, Medicine Lake, Merritt
Reservoir, Crookston, Wood Lake, Eli, Irwin, Rock Hill, Cody Lake,
Anderson Bridge State Wildlife Management Area, Smith Falls State
Park, Highway 97 crossing the Niobrara River, Indian Hill, Highway 61
crossing the Snake River, Steer Creek Campground and Schoolhouse
Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.

&&

LAT...LON 4300 10020 4256 10018 4255 10207 4300 10208

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR

$$

Kulik

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 10, 6:53 PM MDT	Tornado Warning Tornado observed	LBF	Cherry	52 min
Jul 10, 6:56 PM MDT	Severe Thunderstorm Warning	LBF	Cherry, Sheridan	49 min
Jul 10, 7:01 PM MDT	Severe Thunderstorm Warning	LBF	Sheridan	27 min
Jul 10, 7:46 PM MDT	Severe Thunderstorm Warning	LBF	Cherry	59 min
Jul 10, 8:14 PM MDT	Severe Thunderstorm Warning	LBF	Brown, Cherry, Keya Paha, Rock	61 min
Jul 10, 8:39 PM MDT	Special Weather Statement	LBF	Boyd	51 min
Jul 10, 8:46 PM MDT	Severe Thunderstorm Warning	LBF	Cherry, Grant, Hooker, Thomas	59 min
Jul 10, 9:09 PM MDT	Severe Thunderstorm Warning	LBF	Blaine, Brown, Cherry, Thomas	51 min
Jul 10, 9:13 PM MDT	Areal Flood Advisory	LBF	Boyd, Brown, Holt, Keya Paha, Rock	3 hr
Jul 10, 9:21 PM MDT	Special Weather Statement	LBF	Brown, Garfield, Holt, Rock, Wheeler	54 min
Jul 10, 9:24 PM MDT	Severe Thunderstorm Warning	LBF	Cherry, Hooker, Thomas	51 min
Jul 10, 9:54 PM MDT	Special Weather Statement	LBF	Cherry	51 min
Jul 10, 10:10 PM MDT	Severe Thunderstorm Warning	LBF	Cherry	65 min
Jul 10, 10:15 PM MDT	Special Weather Statement	LBF	Garfield, Loup, Wheeler	45 min
Jul 10, 10:18 PM MDT	Special Weather Statement	LBF	Logan, Thomas	57 min
Jul 10, 10:44 PM MDT	Special Weather Statement	LBF	Lincoln	46 min
Jul 10, 11:02 PM MDT	Severe Thunderstorm Warning	LBF	Cherry	43 min
Jul 10, 11:19 PM MDT	Areal Flood Advisory	LBF	Brown, Cherry	3 hr
Jul 10, 11:39 PM MDT	Severe Thunderstorm Warning	LBF	Blaine, Brown, Cherry, Thomas	51 min
Jul 11, 12:02 AM MDT	Severe Thunderstorm Warning	LBF	Blaine, Thomas	43 min
Jul 11, 12:30 AM MDT	Severe Thunderstorm Warning	LBF	Blaine, Custer	45 min
Jul 11, 1:03 AM MDT	Severe Thunderstorm Warning	LBF	Custer	42 min
Jul 11, 1:22 AM MDT	Special Weather Statement	LBF	Custer	38 min
Jul 11, 1:32 AM MDT	Severe Thunderstorm Warning	LBF	Custer	43 min

Nearby

Flash Flood Warnings in Nebraska, 2020 Every flash flood warning in 2020

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.