Alert archive / Nebraska / Flash Flood Warnings in 2020

Flash Flood Warning 8, NWS North Platte, NE

July 29, 2020Boyd County, Holt County, Nebraska

NWS North Platte, NE issued this flash flood warning at Jul 29, 2020, 8:11 PM CDT for Boyd County, Holt 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 29, 2020, 8:11 PM CDT (01:11 UTC)
Expired: Jul 29, 2020, 11:03 PM CDT
In force: 3 hr
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Flood severity: None

Counties Boyd County, NE, Holt County, NE

The radar

The Sioux Falls radar (KFSD), 180 km from the middle of the area, began a volume at 01:12 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 29, 8:15 PM CDT	HEAVY RAIN 1.5	Spencer, NE	FELL IN ABOUT 30 MINUTES
Jul 29, 8:35 PM CDT	FLASH FLOOD	Butte, NE	STREET FLOODING IN BUTTE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 1.2 hours before the alert went out and 230 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1865 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 69 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

330 
WGUS53 KLBF 300111
FFWLBF
NEC015-089-300415-
/O.NEW.KLBF.FF.W.0008.200730T0111Z-200730T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service North Platte NE
811 PM CDT Wed Jul 29 2020

The National Weather Service in North Platte has issued a

* Flash Flood Warning for...
  Northeastern Holt County in north central Nebraska...
  Central Boyd County in north central Nebraska...

* Until 1115 PM CDT.

* At 811 PM CDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to two inches of rain have
  already fallen. Flash flooding is ongoing or expected to begin
  shortly.

  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...
  Spencer, Butte, Lynch, Bristow, Anoka, Spencer Dam, Midway,
  Parshall Bridge State Wildlife Management Area, Scottville, Redbird
  State Wildlife Management Area, Anncar and Hull Lake State Wildlife
  Management Area.

Additional rainfall amounts of two inches are possible in the warned 
area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4296 9898 4294 9859 4277 9835 4260 9859

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

$$

CDC

2 follow-up statements

320 
WGUS73 KLBF 300204
FFSLBF

Flash Flood Statement
National Weather Service North Platte NE
904 PM CDT Wed Jul 29 2020

NEC015-089-300415-
/O.CON.KLBF.FF.W.0008.000000T0000Z-200730T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Holt NE-Boyd NE-
904 PM CDT Wed Jul 29 2020

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1115 PM CDT FOR
NORTHEASTERN HOLT AND CENTRAL BOYD COUNTIES...

At 903 PM CDT, the public reported thunderstorms produced heavy rain 
and street flooding in Butte. Up to two inches of rain have already 
fallen. Flash flooding is ongoing or expected to begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Public.

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...
Spencer, Butte, Lynch, Bristow, Anoka, Spencer Dam, Midway, Parshall
Bridge State Wildlife Management Area, Scottville, Redbird State
Wildlife Management Area, Anncar and Hull Lake State Wildlife
Management Area.

Additional rainfall amounts of one quarter inch are possible in the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 4296 9898 4294 9859 4277 9835 4260 9859

FLASH FLOOD...OBSERVED

$$

CDC

462 
WGUS73 KLBF 300403
FFSLBF

Flash Flood Statement
National Weather Service North Platte NE
1103 PM CDT Wed Jul 29 2020

NEC015-089-300413-
/O.CAN.KLBF.FF.W.0008.000000T0000Z-200730T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Holt NE-Boyd NE-
1103 PM CDT Wed Jul 29 2020

...THE FLASH FLOOD WARNING FOR NORTHEASTERN HOLT AND CENTRAL BOYD
COUNTIES IS CANCELLED...

The heavy rain has ended. Flood waters have receded. Flooding is no
longer expected to pose a threat. Please continue to heed any
remaining road closures.

LAT...LON 4296 9898 4294 9859 4277 9835 4260 9859

$$

CDC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 7:01 PM CDT	Areal Flood Advisory	LBF	Cherry	3 hr
Jul 29, 7:18 PM CDT	Special Weather Statement	LBF	McPherson	42 min
Jul 29, 7:58 PM CDT	Areal Flood Warning	LBF	Hooker, McPherson, Thomas	3 hr
Jul 29, 8:00 PM CDT	Special Weather Statement	LBF	McPherson	45 min
Jul 29, 8:37 PM CDT	Areal Flood Warning	LBF	Lincoln, Logan	3 hr
Jul 29, 8:44 PM CDT	Special Weather Statement	LBF	Lincoln	61 min
Jul 29, 8:54 PM CDT	Areal Flood Advisory	LBF	Lincoln	112 min
Jul 29, 9:24 PM CDT	Special Weather Statement	LBF	Lincoln	51 min
Jul 29, 9:28 PM CDT	Areal Flood Advisory	LBF	Custer	117 min
Jul 29, 9:37 PM CDT	Severe Thunderstorm Warning	LBF	Custer, Lincoln	38 min
Jul 29, 9:48 PM CDT	Special Weather Statement	LBF	Lincoln	42 min
Jul 29, 10:02 PM CDT	Areal Flood Advisory	LBF	Lincoln	84 min
Jul 29, 10:23 PM CDT	Severe Thunderstorm Warning	LBF	Frontier, Hayes, Lincoln	67 min
Jul 29, 10:29 PM CDT	Flash Flood Warning	LBF	Frontier	3 hr

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.