Cold Front Moving Through the Northeast U.S. Monday; Atmospheric River to Impact the Pacific Northwest Midweek

A cold front will cross the Great Lakes and Northeast U.S. through Monday with gusty winds and areas of rain showers. A strong atmospheric river is expected to move into the Pacific Northwest by midweek bringing a threat for moderate to heavy rainfall, gusty winds, and mountain snows for parts of Washington, Oregon, northern California, and the Sierra Nevada. Read More >

Overview

During the afternoon and evening hours of June 29th, scattered severe thunderstorms formed over the mid Missouri Valley, along and ahead of a cold front moving into the region. The approach of an upper-air disturbance from the northwest in conjunction with a moderately unstable air mass yielded a favorable environment for supercells and other organized storm structures which produced a considerable amount of large hail.

One supercell produced a 14.4-mile long tornado in addition to hail up to baseball size while tracking across northern Cedar County in far northeast Nebraska. Later in the evening, another supercell moved across the Omaha metro area, also producing hail up to baseball size.

KOAX Radar Animation for the event

KFSD Radar Animation

Taken near Fordyce, Nebraska (source:@ginschieffer)

Benson area (Source: Heartland REACT)

Tornado
Hail
Satellite
Storm Reports
Environment

Tornadoes:

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Tornado - 4NW Fordyce to 4SSE Wynot
Cedar County

Date	6/29/2017
Time (Local)	5:45 PM - 6:11 PM
EF Rating	EF-1
Est. Peak Winds	100 mph
Path Length	14.4 miles
Max Width	150 yards
Injuries/Deaths	0/0
Summary: A supercell tracked across northern Cedar County Nebraska during the evening of Thursday, June 29th, producing a tornado and hail up to baseball size.

Track Map

Downloadable KMZ File


KOAX Radar Animation	KFSD Radar Animation	Fordyce, Nebraska

The Enhanced Fujita (EF) Scale classifies tornadoes into the following categories:

EF0 Weak 65-85 mph	EF1 Moderate 86-110 mph	EF2 Significant 111-135 mph	EF3 Severe 136-165 mph	EF4 Extreme 166-200 mph	EF5 Catastrophic 200+ mph

Hail


Omaha (Source: Ryan Behringer)	Omaha - 58th and Blondo (Source: Joe Ryberg)	Omaha - 76th and Cass (Source: Erica Williamson)	Omaha - 72nd and Papillion (Source: Kyle Baumgartner)


Papillion (Source: Evan Kuchera)

GOES-16 Visible Satellite

GOES-16 visible satellite loop from 3 PM to just before 9 PM. These data are considered preliminary and non-operational.

Tornado and Hail Reports for June 29th

Tornado Reports

Location	Type	Time	Source	Comments
3 W Wynot	Tornado	601 pm	Public
1 NNE Mapleton	Funnel Cloud	610 pm	Trained Spotter
2 NW Obert	Tornado	613 pm	Trained Spotter	Brief Touchdown

Hail reports

Location	Size	Source	Comments
Benson area	3.75	Social Media
1 NE Omaha	3.00	Trained Spotter
5 NW Helena	2.75	Law Enforcement
3 S Helena	2.75	Public
3 W Papillion	2.00	Trained Spotter
2 SE Papillion	2.00	Trained Spotter
3 WSW Bellevue	2.00	Trained Spotter
2 NW Little Sioux	2.00	Cooperative Observer	Wind speed 55 to 60 mph
2 E Omaha	2.00	Trained Spotter	35th and Charles
1 ENE Chalco	1.75	Trained Spotter	160th and Harrison
2 NE Omaha	1.75	Broadcast Media
4 NW Omaha	1.75	Trained Spotter	114th and Fort Street
2 WNW Millard	1.75	Trained Spotter	174th and F
2 SSE Craig	1.75	Trained Spotter
2 W Millard	1.75	Public
3 SSW Papillion	1.75	Trained Spotter
2 SW Papillion	1.75	Trained Spotter
Council Bluffs	1.50	Broadcast Media
Millard	1.50	NWS Employee
Howells	1.50	Trained Spotter
Papillion	1.50	Public	96th and Highway 370

Environment

Synoptic Overview at 12z (courtesy of SPC)


Figure 1: 250-mb analysis	Figure 2: 300-mb analysis	Figure 3: 500-mb analysis

Figure 4: 700-mb analysis	Figure 5: 850-mb analysis	Figure 6: 925-mb analysis

Synoptic Overview at 00z (courtesy of SPC)


Figure 7: 250-mb analysis	Figure 8: 300-mb analysis	Figure 9: 500-mb analysis

Figure 10: 700-mb analysis	Figure 11: 850-mb analysis	Figure 12: 925-mb analysis

Surface Maps 15z-06z (courtesy of WPC)


Figure 13: 12z surface map	Figure 14: 15z surface map	Figure 15: 18z surface map

Figure 16: 21z surface map	Figure 17: 00z surface map	Figure 18: 03z surface map

Observed Soundings


Figure 19: 12z Omaha, NE sounding	Figure 20: 18z Omaha, NE sounding	Figure 21: 00z Omaha, NE sounding

Mesoscale Environment at 00z (courtesy of SPC)


Figure 22: 500-mb heights and vorticity	Figure 23: surface frontogenesis	Figure 24: lowest 100-mb mean-mixed CAPE

Figure 25: effective bulk shear	Figure 26: effective storm-relative helicity	Figure 27: supercell composite parameter

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Cold Front Moving Through the Northeast U.S. Monday; Atmospheric River to Impact the Pacific Northwest Midweek

June 29th, 2017 Severe Weather Summary