Alert archive / Nebraska / Areal Flood Advisories in 2021

Areal Flood Advisory 5, NWS North Platte, NE

May 17, 2021Chase County, Nebraska

NWS North Platte, NE issued this areal flood advisory at May 17, 2021, 1:31 AM MDT for Chase County, Nebraska. It was in force for 31 min.

The area

The counties it named.

The facts

Issued
May 17, 2021, 1:31 AM MDT (07:31 UTC)
Expired
May 17, 2021, 2:02 AM MDT
In force
31 min
Issued by
NWS North Platte, NE
Area
Storm-based polygon

County Chase County, NE

The radar

The Goodland radar (KGLD), 129 km from the middle of the area, began a volume at 07:35 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, 7.5 hours before the alert went out and 114 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 00:00Z on 2021-05-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 751 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 00:00Z on 2021-05-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 78 square meters per square second.1939Sfc1 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
751 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
872 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
78 m²/s²
0-3 km storm-relative helicity
179 m²/s²
Significant tornado parameter
0.3
Supercell composite
2.1

Open this sounding in Storm Lab

What forecasters said that day

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

NWS North Platte, NE wrote its last area forecast discussion before this areal flood advisory went out at May 16, 10:48 PM MDT, 2 hours 43 minutes earlier.

Area forecast discussion, May 16, 10:48 PM MDT, 2 hours 43 minutes before
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Hazardous weather outlook, May 16, 1:34 PM MDT, 11 hours 57 minutes before
Hazardous Weather Outlook
National Weather Service North Platte NE
234 PM CDT Sun May 16 2021

NEZ004>010-022>029-035>038-056>059-069>071-094-171945-
Sheridan-Eastern Cherry-Keya Paha-Boyd-Brown-Rock-Holt-Garden-
Grant-Hooker-Thomas-Blaine-Loup-Garfield-Wheeler-Arthur-McPherson-
Logan-Custer-Deuel-Keith-Perkins-Lincoln-Chase-Hayes-Frontier-
Western Cherry-
234 PM CDT Sun May 16 2021 /134 PM MDT Sun May 16 2021/

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

.DAY ONE...TONIGHT.

Showers and thunderstorms are be possible this evening, with some
storms having potential to be strong to severe. The greatest
threat is expected for southwest Nebraska. The main impacts will
be large hail, gusty winds, and localized heavy rainfall.
Localized flooding is possible across portions of north central
and southwest Nebraska.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.

The week will continue to see the potential for thunderstorms
each evening. The severe threat is being monitored for each day.
Yet, tomorrow the severe threat looks to be low.

.SPOTTER INFORMATION STATEMENT...

Please relay any information about observed severe weather to the
NWS.

&&

Get your weather, hydrological, and climate information at
http://www.weather.gov/northplatte

In the hours before

Special weather statement, May 16, 8:25 PM MDT, 5 hours 6 minutes before
Special Weather Statement
National Weather Service North Platte NE
925 PM CDT Sun May 16 2021

NEZ070-071-170330-
Frontier NE-Hayes NE-
925 PM CDT Sun May 16 2021

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN FRONTIER AND EAST CENTRAL
HAYES COUNTIES UNTIL 1030 PM CDT...

At 925 PM CDT, Doppler radar was tracking a strong thunderstorm near
Curtis, moving south at 15 mph.

Nickel size hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
Curtis, Maywood and Quick.

This includes Highway 83 between mile markers 30 and 48.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 4066 10067 4064 10050 4036 10048 4043 10087
TIME...MOT...LOC 0225Z 019DEG 14KT 4060 10060

Kulik
Local storm report, May 16, 9:01 PM MDT, 4 hours 30 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
May 16, 8:25 PM MDTSpecial Weather StatementLBFFrontier65 min
May 16, 8:33 PM MDTSevere Thunderstorm WarningLBFFrontier, Hayes18 min
May 17, 2:02 AM MDTFlash Flood WarningLBFChase3 hr
May 17, 8:37 AM MDTAreal Flood WarningLBFKeith, Lincoln, McPherson3 hr

Nearby

Areal Flood Advisories in Nebraska, 2021Every areal flood advisory in 2021

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.