Alert archive / Nebraska / Heat Advisories in 2017

Heat Advisory 2, NWS Omaha, NE

July 10, 201714 counties in Nebraska; 5 counties in Iowa

NWS Omaha, NE issued this heat advisory at Jul 10, 2017, 2:51 PM CDT for 14 counties in Nebraska; 5 counties in Iowa. It took effect at Jul 11, 2017, 12:00 PM CDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Jul 10, 2017, 2:51 PM CDT (19:51 UTC)
In effect from: Jul 11, 2017, 12:00 PM CDT
Expired: Jul 11, 2017, 8:00 PM CDT
In force: 8 hr
Issued by: NWS Omaha, NE

Counties Fremont County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Cass County, NE, Douglas County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE

The radar

The Omaha radar (KOAX), 69 km from the middle of the area, began a volume at 19:55 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

Topeka, KS (KFOE), launched 12:00Z, 7.9 hours before the alert went out and 197 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: 1502 J/kg
Mixed-layer CIN: -313 J/kg
Mixed-layer LCL: 1313 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: 71 m²/s²
0-3 km storm-relative helicity: 145 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

What forecasters said that day

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

NWS Omaha, NE wrote its last area forecast discussion before this heat advisory went out at Jul 10, 2:38 PM CDT, 13 minutes earlier.

Area forecast discussion, Jul 10, 2:38 PM CDT, 13 minutes before

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Hazardous weather outlook, Jul 10, 11:58 AM CDT, 2 hours 53 minutes before

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Nearby

Heat Advisories in Nebraska, 2017 Heat Advisories in Iowa, 2017 Every heat 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.