Alert archive / Nebraska / Frost Advisories in 2017

Frost Advisory 3, NWS Hastings, NE

May 20, 201714 counties in Nebraska

NWS Hastings, NE issued this frost advisory at May 20, 2017, 3:00 AM CDT for 14 counties in Nebraska. It took effect at May 21, 2017, 3:00 AM CDT. It was in force for 5 hr.

The area

The counties it named.

The facts

Issued: May 20, 2017, 3:00 AM CDT (08:00 UTC)
In effect from: May 21, 2017, 3:00 AM CDT
Expired: May 21, 2017, 8:00 AM CDT
In force: 5 hr
Issued by: NWS Hastings, NE

Counties Adams County, NE, Buffalo County, NE, Dawson County, NE, Franklin County, NE, Furnas County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Harlan County, NE, Howard County, NE, Kearney County, NE, Phelps County, NE, Sherman County, NE, Valley County, NE

The radar

The Grand Island radar (KUEX), 74 km from the middle of the area, began a volume at 08:02 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, 8.0 hours before the alert went out and 132 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: 602 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 101 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 frost advisory 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 frost advisory went out at May 20, 1:12 AM CDT, 1 hour 48 minutes earlier.

Area forecast discussion, May 20, 1:12 AM CDT, 1 hour 48 minutes before

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Hazardous weather outlook, May 19, 9:36 PM CDT, 5 hours 24 minutes before

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In the hours before

Special weather statement, May 19, 10:50 PM CDT, 4 hours 10 minutes before

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Special weather statement, May 19, 11:24 PM CDT, 3 hours 36 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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        Please try again in a few minutes.
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The office that day

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

Issued	Product	Office	Counties	Lasted
May 19, 9:07 PM CDT	River Flood Warning	GID	Nuckolls, Webster	35 hr
May 19, 10:50 PM CDT	Special Weather Statement	GID	Thayer	40 min
May 19, 11:24 PM CDT	Special Weather Statement	GID	Fillmore, Thayer	51 min
May 20, 1:39 PM CDT	Areal Flood Warning	GID	Thayer	24 hr
May 19, 9:07 PM CDT	River Flood Warning	GID	Osborne	3 days
May 20, 1:14 PM CDT	Areal Flood Warning	GID	Mitchell	24 hr

Nearby

Frost Advisories in Nebraska, 2017 Every frost advisory 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.