Alert archive / Nebraska / Flash Flood Warnings in 2019

Flash Flood Warning 31, NWS Hastings, NE

August 2, 2019Valley County, Nebraska

NWS Hastings, NE issued this flash flood warning at Aug 2, 2019, 11:28 AM CDT for Valley County, Nebraska. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 2, 2019, 11:28 AM CDT (16:28 UTC)
Expired
Aug 2, 2019, 5:30 PM CDT
In force
6 hr
Issued by
NWS Hastings, NE
Area
Storm-based polygon
Flood severity
None

County Valley County, NE

The radar

The North Platte radar (KLNX), 139 km from the middle of the area, began a volume at 16:31 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 12:00Z, 4.5 hours before the alert went out and 144 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-pSkew-T log-p diagram, N. Platte/Lee Bi, NE at 12:00Z on 2019-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 733 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, N. Platte/Lee Bi, NE at 12:00Z on 2019-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 29 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
733 J/kg
Mixed-layer CIN
-15 J/kg
Mixed-layer LCL
568 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
29 m²/s²
0-3 km storm-relative helicity
22 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Hastings, NE wrote its last area forecast discussion before this flash flood warning went out at Aug 2, 8:41 AM CDT, 2 hours 47 minutes earlier.

Area forecast discussion, Aug 2, 8:41 AM CDT, 2 hours 47 minutes before
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Hazardous weather outlook, Aug 2, 8:48 AM CDT, 2 hours 40 minutes before
Hazardous Weather Outlook...UPDATED
National Weather Service Hastings NE
848 AM CDT Fri Aug 2 2019

KSZ005>007-017>019-NEZ039>041-046>049-060>064-072>077-082>087-
031400-
Phillips-Smith-Jewell-Rooks-Osborne-Mitchell-Valley-Greeley-Nance-
Sherman-Howard-Merrick-Polk-Dawson-Buffalo-Hall-Hamilton-York-
Gosper-Phelps-Kearney-Adams-Clay-Fillmore-Furnas-Harlan-Franklin-
Webster-Nuckolls-Thayer-
848 AM CDT Fri Aug 2 2019

This Hazardous Weather Outlook is for south central Nebraska and
portions of north central Kansas.

.DAY ONE...Today and Tonight.

Scattered showers will continue to produce heavy downpours until
sunset. An isolated thunderstorm or two could develop mainly this
afternoon and evening. The main threat will be locally heavy
rainfall...but small hail and gusty winds cannot be completely
ruled out with any thunderstorms that might develop.

A Flash Flood Watch remains in effect for portions of the outlook
area through noon. Flood warnings are also in effect for parts of
the area. Please refer the latest watch and warning statements
for detailed information.

After midnight...there will be the potential for the development
of fog across the outlook area. Visibility may be reduced to one
half mile or less at times.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Saturday morning, there will be the potential for the development
of fog across the outlook area. Visibility may be reduced to one
half mile or less at times.

Thunderstorm chances remain in the forecast across the outlook
area into Saturday morning, then return on a periodic basis
Monday night through Thursday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected through tonight, but please
relay any reports of flooding and rain gauge measurements of 3
inches or more via our website or social media.

&&

More information may be obtained at the following web page:
   https://www.weather.gov/hastings

ADP/Kelley

In the hours before

Local storm report, Aug 2, 7:45 AM CDT, 3 hours 43 minutes before
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Local storm report, Aug 2, 8:22 AM CDT, 3 hours 6 minutes before
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Local storm report, Aug 2, 9:16 AM CDT, 2 hours 12 minutes before
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Local storm report, Aug 2, 9:24 AM CDT, 2 hours 4 minutes before
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Local storm report, Aug 2, 10:18 AM CDT, 1 hour 10 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 2, 6:34 AM CDTAreal Flood WarningGIDFranklin, Webster11 hr
Aug 2, 8:28 AM CDTRiver Flood WarningGIDNuckolls, Webster13 hr
Aug 2, 2:10 PM CDTFlash Flood WarningGIDValley4 hr
Aug 2, 5:34 PM CDTAreal Flood WarningGIDGreeley, Valley22 hr
Aug 2, 2:28 AM CDTAreal Flood AdvisoryGIDJewell, Mitchell6 hr
Aug 2, 6:45 AM CDTAreal Flood WarningGIDJewell, Mitchell35 hr
Aug 2, 8:23 AM CDTRiver Flood WarningGIDMitchell105 min

Nearby

Flash Flood Warnings in Nebraska, 2019Every flash flood warning in 2019

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.