Alert archive / Nebraska / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 172, NWS Hastings, NE

August 21, 2007Greeley County, Howard County, Nebraska

NWS Hastings, NE issued this severe thunderstorm warning at Aug 21, 2007, 7:39 PM CDT for Greeley County, Howard County, Nebraska. It was in force for 36 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
Aug 21, 2007, 7:39 PM CDT (00:39 UTC)
Expired
Aug 21, 2007, 8:15 PM CDT
In force
36 min
Issued by
NWS Hastings, NE
Area
Counties, with a storm outline in the text

Counties Greeley County, NE, Howard County, NE

The radar

The Grand Island radar (KUEX), 119 km from the middle of the area, began a volume at 00:39 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.

IssuedProductOfficeLasted
Aug 21, 3:50 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 0.7 hours before the alert went out and 176 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 2007-08-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2007-08-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -14 square meters per square second.193958Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3575 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
-14 m²/s²
0-3 km storm-relative helicity
15 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 severe thunderstorm warning 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 severe thunderstorm warning went out at Aug 21, 6:38 PM CDT, 1 hour 1 minute earlier.

Area forecast discussion, Aug 21, 6:38 PM CDT, 1 hour 1 minute before
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Hazardous weather outlook, Aug 21, 12:00 PM CDT, 7 hours 39 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HASTINGS NE
1200 PM CDT TUE AUG 21 2007

KSZ005>007-017>019-NEZ039>041-046>049-060>064-072>077-082>087-
221200-
PHILLIPS-SMITH-JEWELL-ROOKS-OSBORNE-MITCHELL-VALLEY-GREELEY-NANCE-
SHERMAN-HOWARD-MERRICK-POLK-DAWSON-BUFFALO-HALL-HAMILTON-YORK-
GOSPER-PHELPS-KEARNEY-ADAMS-CLAY-FILLMORE-FURNAS-HARLAN-FRANKLIN-
WEBSTER-NUCKOLLS-THAYER-
1200 PM CDT TUE AUG 21 2007

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

.DAY ONE...THIS AFTERNOON AND TONIGHT.

A FRONTAL BOUNDARY ACROSS THE OUTLOOK AREA WILL PROVIDE THE FOCUS
FOR THUNDERSTORM DEVELOPMENT AFTER 4 PM. THE STORMS ARE EXPECTED
TO BECOME MORE ORGANIZED DURING THE EVENING AND OVERNIGHT HOURS.
THE PRIMARY HAZARDS WILL BE DAMAGING WIND GUSTS TO 70 MPH AND
LARGE HAIL THE SIZE OF GOLFBALLS. LOCALLY HEAVY RAINFALL AMOUNTS
AROUND TWO INCHES ARE POSSIBLE...WHICH MAY CAUSE FLOODING PROBLEMS.

DANGEROUSLY HOT CONDITIONS ARE ONCE AGAIN EXPECTED THIS AFTERNOON
WITH HEAT INDEX VALUES OF 100 TO 110 DEGREES.

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

A FRONTAL BOUNDARY WILL REMAIN ACROSS THE OUTLOOK AREA THROUGH THE
WORKWEEK. THIS WILL BRING CONTINUED CHANCES FOR THUNDERSTORMS...WHICH
MAY BECOME SEVERE. IN ADDITION...SEVERAL DAYS OF RAINFALL MAY
RESULT IN FLOODING PROBLEMS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED AFTER 4 PM.

&&

MORE INFORMATION MAY BE OBTAINED AT THE FOLLOWING WEB PAGE:
   HTTP://WWW.WEATHER.GOV/HASTINGS  (ALL LOWERCASE)

WESELY

In the hours before

Special weather statement, Aug 21, 7:03 PM CDT, 36 minutes before
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Local storm report, Aug 21, 7:06 PM CDT, 33 minutes before
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Local storm report, Aug 21, 7:07 PM CDT, 32 minutes before
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Local storm report, Aug 21, 7:11 PM CDT, 28 minutes before
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Special weather statement, Aug 21, 7:30 PM CDT, 9 minutes before
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Special weather statement, Aug 21, 7:33 PM CDT, 6 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 21, 7:40 PM CDTSevere Thunderstorm WarningGIDDawson65 min
Aug 21, 7:47 PM CDTSevere Thunderstorm WarningGIDGreeley, Valley58 min
Aug 21, 7:50 PM CDTSevere Thunderstorm WarningGIDGosper55 min
Aug 21, 8:44 PM CDTSevere Thunderstorm WarningGIDGosper61 min
Aug 21, 9:18 PM CDTSevere Thunderstorm WarningGIDDawson42 min
Aug 22, 2:39 PM CDTSevere Thunderstorm WarningGIDValley32 min
Aug 22, 4:00 PM CDTSevere Thunderstorm WarningGIDBuffalo, Hall, Howard, Sherman45 min
Aug 22, 4:15 PM CDTSevere Thunderstorm WarningGIDFurnas, Gosper45 min
Aug 22, 4:18 PM CDTSevere Thunderstorm WarningGIDBuffalo42 min
Aug 22, 4:34 PM CDTSevere Thunderstorm WarningGIDAdams41 min
Aug 22, 4:40 PM CDTSevere Thunderstorm WarningGIDFurnas, Gosper35 min
Aug 22, 4:40 PM CDTSevere Thunderstorm WarningGIDHall50 min
Aug 22, 5:05 PM CDTTornado WarningGIDAdams, Clay25 min
Aug 22, 5:11 PM CDTSevere Thunderstorm WarningGIDHamilton64 min
Aug 22, 5:14 PM CDTSevere Thunderstorm WarningGIDPhelps61 min
Aug 22, 5:26 PM CDTSevere Thunderstorm WarningGIDFurnas, Harlan50 min
Aug 22, 5:28 PM CDTSevere Thunderstorm WarningGIDAdams, Clay47 min
Aug 22, 5:40 PM CDTTornado WarningGIDClay35 min
Aug 22, 5:53 PM CDTTornado WarningGIDClay37 min
Aug 22, 6:01 PM CDTSevere Thunderstorm WarningGIDFillmore44 min
Aug 22, 6:06 PM CDTSevere Thunderstorm WarningGIDNuckolls, Thayer54 min
Aug 22, 6:10 PM CDTSevere Thunderstorm WarningGIDHamilton, York51 min
Aug 22, 6:14 PM CDTSevere Thunderstorm WarningGIDFranklin, Kearney46 min
Aug 22, 6:17 PM CDTTornado WarningGIDFillmore28 min
Aug 22, 6:42 PM CDTSevere Thunderstorm WarningGIDFillmore20 min
Aug 22, 6:48 PM CDTSevere Thunderstorm WarningGIDAdams, Webster27 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2007Every severe thunderstorm warning in 2007

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.