Alert archive / Nebraska / Flash Flood Watches in 2017

Flash Flood Watch 1, NWS Hastings, NE

May 17, 201715 counties in Nebraska; 6 counties in Kansas

NWS Hastings, NE issued this flash flood watch at May 17, 2017, 3:05 PM CDT for 15 counties in Nebraska; 6 counties in Kansas. It took effect at May 18, 2017, 6:00 PM CDT. It was in force for 10 hr.

The area

The counties it named.

The facts

Issued
May 17, 2017, 3:05 PM CDT (20:05 UTC)
In effect from
May 18, 2017, 6:00 PM CDT
Expired
May 19, 2017, 4:02 AM CDT
In force
10 hr
Issued by
NWS Hastings, NE
Flood severity
None
All 21 counties

Jewell County, KS, Mitchell County, KS, Osborne County, KS, Phillips County, KS, Rooks County, KS, Smith County, KS, Adams County, NE, Clay County, NE, Fillmore County, NE, Franklin County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Kearney County, NE, Merrick County, NE, Nuckolls County, NE, Phelps County, NE, Polk County, NE, Thayer County, NE, Webster County, NE, York County, NE

The radar

The Grand Island radar (KUEX), 4 km from the middle of the area, began a volume at 20:05 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

Omaha, NE (KOAX), launched 12:00Z, 8.1 hours before the alert went out and 210 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, Omaha, NE at 12:00Z on 2017-05-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 121 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, Omaha, NE at 12:00Z on 2017-05-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 119 square meters per square second.1939587897Sfc1 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
121 J/kg
Mixed-layer CIN
-156 J/kg
Mixed-layer LCL
1106 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
119 m²/s²
0-3 km storm-relative helicity
132 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 watch went out at May 17, 12:46 PM CDT, 2 hours 19 minutes earlier.

Area forecast discussion, May 17, 12:46 PM CDT, 2 hours 19 minutes before
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Hazardous weather outlook, May 17, 4:50 AM CDT, 10 hours 15 minutes before
Hazardous Weather Outlook...CORRECTED
National Weather Service Hastings NE
450 AM CDT Wed May 17 2017

KSZ005>007-017>019-NEZ039>041-046>049-060>064-072>077-082>087-
181200-
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-
450 AM CDT Wed May 17 2017

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

.DAY ONE...Today and Tonight.

This morning, thunderstorms are expected to expand in coverage
across the outlook area. There will be the potential for some
thunderstorms to be strong, with small hail and gusty winds the
primary hazards.

This afternoon, thunderstorm chances continue, and there is a
chance that a few may become severe. The best chance for severe
thunderstorms looks to be east of Highway 281. The primary
hazards would be hail near the size of quarters and wind gusts
near 60 MPH, though an isolated tornado is not completely out of
the question.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Thunderstorms are possible Thursday afternoon and overnight for
most of the outlook area. Along and south of Interstate 80, some
of the thunderstorms could be severe with large hail and damaging
winds.

There could be a few thunderstorms Friday afternoon and evening
and again Monday afternoon and evening. Severe weather is not
expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this afternoon for areas east of
Highway 281.

&&

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

In the hours before

Special weather statement, May 17, 12:02 PM CDT, 3 hours 3 minutes before
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Local storm report, May 17, 12:11 PM CDT, 2 hours 54 minutes before
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Local storm report, May 17, 12:31 PM CDT, 2 hours 34 minutes before
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Local storm report, May 17, 1:15 PM CDT, 1 hour 50 minutes before
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Local storm report, May 17, 1:28 PM CDT, 1 hour 37 minutes before
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Local storm report, May 17, 2:06 PM CDT, 59 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
May 16, 7:03 PM CDTSevere Thunderstorm WarningGIDBuffalo, Kearney, Phelps42 min
May 16, 7:04 PM CDTSpecial Weather StatementGIDNuckolls26 min
May 16, 7:15 PM CDTSpecial Weather StatementGIDClay, Fillmore, Thayer30 min
May 16, 7:32 PM CDTSevere Thunderstorm WarningGIDHall, Hamilton, Howard, Merrick29 min
May 16, 7:45 PM CDTSpecial Weather StatementGIDHoward45 min
May 16, 7:46 PM CDTSevere Thunderstorm WarningGIDThayer15 min
May 16, 11:22 PM CDTSevere Thunderstorm WarningGIDFurnas, Gosper, Harlan, Phelps38 min
May 16, 11:58 PM CDTSevere Thunderstorm WarningGIDFranklin, Harlan, Kearney, Phelps47 min
May 17, 12:31 AM CDTSevere Thunderstorm WarningGIDAdams, Franklin, Kearney, Webster44 min
May 17, 1:02 AM CDTSpecial Weather StatementGIDClay, Nuckolls43 min
May 17, 1:25 AM CDTSpecial Weather StatementGIDHamilton, York50 min
May 17, 1:34 AM CDTSpecial Weather StatementGIDFillmore, York41 min
May 17, 2:00 AM CDTSpecial Weather StatementGIDPolk45 min
May 17, 11:27 AM CDTAreal Flood WarningGIDFranklin, Harlan, Webster12 hr
May 17, 11:58 AM CDTSpecial Weather StatementGIDThayer47 min
May 17, 12:02 PM CDTSpecial Weather StatementGIDThayer43 min
May 16, 8:39 PM CDTSpecial Weather StatementGIDOsborne51 min
May 16, 8:47 PM CDTSpecial Weather StatementGIDMitchell28 min
May 16, 9:34 PM CDTSpecial Weather StatementGIDMitchell41 min
May 16, 10:16 PM CDTSpecial Weather StatementGIDMitchell14 min
May 17, 6:49 AM CDTSpecial Weather StatementGIDMitchell41 min
May 17, 6:58 AM CDTSevere Thunderstorm WarningGIDJewell, Mitchell21 min
May 17, 11:25 AM CDTSpecial Weather StatementGIDMitchell50 min

Nearby

Flash Flood Watches in Nebraska, 2017Flash Flood Watches in Kansas, 2017Every flash flood watch in 2017

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.