Alert archive / Nebraska / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 197, NWS North Platte, NE

June 22, 2010Keith County, Perkins County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Jun 22, 2010, 10:46 PM MDT for Keith County, Perkins County, Nebraska. It was in force for 44 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 22, 2010, 10:46 PM MDT (04:46 UTC)
Expired: Jun 22, 2010, 11:30 PM MDT
In force: 44 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Keith County, NE, Perkins County, NE

The radar

The North Platte radar (KLNX), 137 km from the middle of the area, began a volume at 04:49 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 22, 4:03 PM MDT	Tornado Watch	SPC	7 hr
Jun 22, 5:30 PM MDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 4.8 hours before the alert went out and 89 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: 2746 J/kg
Mixed-layer CIN: -128 J/kg
Mixed-layer LCL: 1057 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 71 m²/s²
0-3 km storm-relative helicity: 148 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 7.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Jun 22, 10:43 PM MDT, 3 minutes earlier.

Area forecast discussion, Jun 22, 10:43 PM MDT, 3 minutes before

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Hazardous weather outlook, Jun 22, 3:04 PM MDT, 7 hours 42 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORTH PLATTE NE
404 PM CDT TUE JUN 22 2010

NEZ004>010-022>029-035>038-056>059-069>071-094-232115-
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-
404 PM CDT TUE JUN 22 2010 /304 PM MDT TUE JUN 22 2010/

...CORRECTED SPOTTER ACTIVATION WORDING BELOW...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WESTERN AND
NORTH CENTRAL NEBRASKA.

.DAY ONE...TONIGHT.

THUNDERSTORM DEVELOPMENT WILL BE LIKELY ACROSS MUCH OF WESTERN
AND NORTH CENTRAL NEBRASKA THIS EVENING AND INTO THE EARLY MORNING
HOURS. THE MOST LIKELY SCENARIO LOOKS TO HAVE A LARGE COMPLEX OF STORMS
MOVING OUT OF EASTERN WYOMING BY EARLY EVENING...AND MOVE ACROSS
THE SANDHILLS AND NORTH CENTRAL NEBRASKA THROUGH THE LATE EVENING
AND EARLY MORNING HOURS. HOWEVER ADDITIONAL STORM DEVELOPMENT WILL
BE POSSIBLE ACROSS THE SOUTHWEST AND CENTRAL NEBRASKA DURING THE
EARLY MORNING HOURS. OVERALL THE GREATEST THREAT LOOKS TO BE LARGE
HAIL AND DAMAGING WINDS GUSTS...HOWEVER ISOLATED TORNADOES CAN NOT
BE RULED OUT ACROSS WESTERN NEBRASKA THROUGH THE EVENING. WITH A
VERY MOIST ATMOSPHERE IN PLACE...HEAVY RAIN IS POSSIBLE OVER MUCH
OF THE AREA. WITH MANY AREAS ALREADY SATURATED...HEAVY RUN OFF
WILL CONTINUE TO PRESENT A THREAT OF FLOODING. AREAS OF THE
SOUTHWEST...ALONG AND SOUTH OF HIGHWAY 23...LOOK TO BE THE MOST
PRONE TO FLASH FLOODING DUE TO THE HEAVY RAINFALL THE PAST TWO
DAYS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

AFTER A BRIEF PERIOD OF LITTLE OR NO PRECIPITATION...THERE IS A
SLIGHT CHANCE OF THUNDERSTORMS WITH ANOTHER FRONT COMING ACROSS
SATURDAY AND SUNDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE NEEDED THROUGH TONIGHT. SEVERE WEATHER
REPORTS WOULD BE GREATLY APPRECIATED.

&&

THIS PRODUCT IS NOW AVAILABLE...ALONG WITH OTHER WEATHER...
HYDROLOGICAL AND CLIMATOLOGICAL INFORMATION...AT
HTTP://WWW.WEATHER.GOV/NORTHPLATTE

13

In the hours before

Local storm report, Jun 22, 8:35 PM MDT, 2 hours 11 minutes before

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Local storm report, Jun 22, 8:45 PM MDT, 2 hours 1 minute before

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Local storm report, Jun 22, 9:00 PM MDT, 1 hour 46 minutes before

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Local storm report, Jun 22, 9:15 PM MDT, 1 hour 31 minutes before

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Local storm report, Jun 22, 9:46 PM MDT, 1 hour before

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Local storm report, Jun 22, 10:13 PM MDT, 33 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 22, 6:14 PM MDT	Severe Thunderstorm Warning	LBF	Sheridan	46 min
Jun 22, 6:27 PM MDT	Tornado Warning	LBF	Cherry, Sheridan	33 min
Jun 22, 6:41 PM MDT	Severe Thunderstorm Warning	LBF	Cherry	49 min
Jun 22, 7:12 PM MDT	Areal Flood Advisory	LBF	Sheridan	4 hr
Jun 22, 7:27 PM MDT	Severe Thunderstorm Warning	LBF	Cherry	48 min
Jun 22, 7:37 PM MDT	Severe Thunderstorm Warning	LBF	Custer	38 min
Jun 22, 7:45 PM MDT	Severe Thunderstorm Warning	LBF	Cherry	45 min
Jun 22, 8:01 PM MDT	Severe Thunderstorm Warning	LBF	Hayes, Lincoln	44 min
Jun 22, 8:16 PM MDT	Tornado Warning	LBF	Hayes, Lincoln	44 min
Jun 22, 8:20 PM MDT	Severe Thunderstorm Warning	LBF	Brown, Keya Paha	40 min
Jun 22, 8:52 PM MDT	Severe Thunderstorm Warning	LBF	Holt, Wheeler	38 min
Jun 22, 9:00 PM MDT	Severe Thunderstorm Warning	LBF	Brown, Keya Paha, Rock	45 min
Jun 22, 9:09 PM MDT	Severe Thunderstorm Warning	LBF	Garfield, Holt, Wheeler	30 min
Jun 22, 9:26 PM MDT	Severe Thunderstorm Warning	LBF	Holt, Rock	49 min
Jun 22, 9:57 PM MDT	Severe Thunderstorm Warning	LBF	Holt	37 min
Jun 22, 11:03 PM MDT	Severe Thunderstorm Warning	LBF	Perkins	42 min
Jun 23, 12:09 AM MDT	Areal Flood Warning	LBF	Keith, Lincoln, Perkins	6 hr

Nearby

Severe Thunderstorm Warnings in Nebraska, 2010 Every severe thunderstorm warning in 2010

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.