Alert archive / Nebraska / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 164, NWS Hastings, NE

August 20, 2007Merrick County, Nebraska

NWS Hastings, NE issued this severe thunderstorm warning at Aug 20, 2007, 6:56 PM CDT for Merrick County, Nebraska. It was in force for 64 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 20, 2007, 6:56 PM CDT (23:56 UTC)
Expired
Aug 20, 2007, 8:00 PM CDT
In force
64 min
Issued by
NWS Hastings, NE
Area
Counties, with a storm outline in the text

County Merrick County, NE

The radar

The Grand Island radar (KUEX), 100 km from the middle of the area, began a volume at 23:56 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 20, 3:49 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 11.9 hours before the alert went out and 140 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, Omaha, NE at 12:00Z on 2007-08-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 768 joules per kilogram.LCLLFCEL10008507005003002001001 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, Omaha, NE at 12:00Z on 2007-08-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 68 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
768 J/kg
Mixed-layer CIN
-216 J/kg
Mixed-layer LCL
1084 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
68 m²/s²
0-3 km storm-relative helicity
129 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

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 20, 6:44 PM CDT, 12 minutes earlier.

Area forecast discussion, Aug 20, 6:44 PM CDT, 12 minutes before
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Hazardous weather outlook, Aug 20, 4:38 PM CDT, 2 hours 18 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE HASTINGS NE
438 PM CDT MON AUG 20 2007

NEZ040-041-047>049-062>064-074>077-084>087-211200-
GREELEY-NANCE-HOWARD-MERRICK-POLK-HALL-HAMILTON-YORK-KEARNEY-
ADAMS-CLAY-FILLMORE-FRANKLIN-WEBSTER-NUCKOLLS-THAYER-
438 PM CDT MON AUG 20 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL NEBRASKA
PRIMARILY ALONG AND EAST OF HIGHWAY 281.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

SCATTERED STRONG TO SEVERE THUNDERSTORMS ARE EXPECTED THIS
AFTERNOON INTO TONIGHT ALONG A SURFACE FRONT LOCATED ACROSS SOUTH
CENTRAL NEBRASKA. THESE STORMS WILL BE CAPABLE OF PRODUCING HAIL
TO SIZE OF TENNIS BALLS...WIND GUSTS IN EXCESS OF 60 MPH...AND
ISOLATED TORNADOES. IN ADDITION...LOCALIZED HEAVY RAINFALL MAY
RESULT IN AREAS OF FLASH FLOODING.

INTENSE HEAT CAN ALSO BE EXPECTED THIS AFTERNOON AND EVENING WITH
HEAT INDEX VALUES OF 100 TO 115.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

CURRENT TRENDS INDICATE THE OUTLOOK AREA CAN EXPECT SEVERAL DAYS
OF AT LEAST SCATTERED THUNDERSTORMS...ESPECIALLY DURING THE
EVENING AND NIGHTTIME HOURS. THE THUNDERSTORMS WILL BE MOST LIKELY
FROM TUESDAY THROUGH FRIDAY.

THUNDERSTORMS TUESDAY EVENING INTO TUESDAY NIGHT MAY BE STRONG TO
SEVERE...CAPABLE OF PRODUCING LARGE HAIL...DAMAGING WINDS...AND HEAVY
RAIN. THE RISK FOR LOCALLY HEAVY RAINS WILL CONTINUE THROUGH
THURSDAY...AND MAY RESULT IN FLOODING ISSUES FOR SOME AREAS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL LIKELY BE NEEDED THIS AFTERNOON AND EVENING.

&&

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

KSZ005>007-017>019-211200-
PHILLIPS-SMITH-JEWELL-ROOKS-OSBORNE-MITCHELL-
438 PM CDT MON AUG 20 2007

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

.DAY ONE...THIS AFTERNOON AND TONIGHT.

SCATTERED STRONG TO SEVERE THUNDERSTORMS ARE EXPECTED THIS
AFTERNOON INTO TONIGHT ALONG A SURFACE FRONT LOCATED ACROSS NORTH
CENTRAL KANSAS. THE PRIMARY SEVERE WEATHER THREAT WILL BE HAIL TO
THE SIZE OF TENNIS BALLS AND WIND GUSTS IN EXCESS OF 60 MPH.
HOWEVER...THERE IS ALSO THE POSSIBILITY OF AN ISOLATED TORNADO.
IN ADDITION...LOCALIZED HEAVY RAINFALL MAY RESULT IN AREAS OF
FLASH FLOODING.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

CURRENT TRENDS INDICATE THE OUTLOOK AREA CAN EXPECT SEVERAL DAYS
OF AT LEAST SCATTERED THUNDERSTORMS...ESPECIALLY DURING THE
EVENING AND NIGHTTIME HOURS. THE THUNDERSTORMS WILL BE MOST LIKELY
FROM TUESDAY THROUGH FRIDAY.

THUNDERSTORMS TUESDAY EVENING INTO TUESDAY NIGHT MAY BE STRONG TO
SEVERE...CAPABLE OF PRODUCING LARGE HAIL...DAMAGING WINDS...AND HEAVY
RAIN. THE RISK FOR LOCALLY HEAVY RAINS WILL CONTINUE THROUGH
THURSDAY...AND MAY RESULT IN FLOODING ISSUES FOR SOME AREAS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL LIKELY BE NEEDED THIS AFTERNOON AND TONIGHT.

&&

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

NEZ039-046-060-061-072-073-082-083-211200-
VALLEY-SHERMAN-DAWSON-BUFFALO-GOSPER-PHELPS-FURNAS-HARLAN-
438 PM CDT MON AUG 20 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL NEBRASKA
PRIMARILY WEST OF HIGHWAY 281.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

THERE IS A SLIGHT CHANCE OF THUNDERSTORMS THIS AFTERNOON AND
TONIGHT. THE PRIMARY THREAT WILL BE HAIL TO THE SIZE OF NICKELS
AND WIND GUSTS TO 50 MPH.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

CURRENT TRENDS INDICATE THE OUTLOOK AREA CAN EXPECT SEVERAL DAYS
OF AT LEAST SCATTERED THUNDERSTORMS...ESPECIALLY DURING THE
EVENING AND NIGHTTIME HOURS. THE THUNDERSTORMS WILL BE MOST LIKELY
FROM TUESDAY THROUGH FRIDAY.

THUNDERSTORMS TUESDAY EVENING INTO TUESDAY NIGHT MAY BE STRONG TO
SEVERE...CAPABLE OF PRODUCING LARGE HAIL...DAMAGING WINDS...AND HEAVY
RAIN. THE RISK FOR LOCALLY HEAVY RAINS WILL CONTINUE THROUGH
THURSDAY...AND MAY RESULT IN FLOODING ISSUES FOR SOME AREAS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION SHOULD NOT BE NEEDED THIS AFTERNOON INTO TONIGHT.

&&

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

WESELY

In the hours before

Local storm report, Aug 20, 6:12 PM CDT, 44 minutes before
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Special weather statement, Aug 20, 6:29 PM CDT, 27 minutes before
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Local storm report, Aug 20, 6:41 PM CDT, 15 minutes before
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Local storm report, Aug 20, 6:42 PM CDT, 14 minutes before
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Local storm report, Aug 20, 6:45 PM CDT, 11 minutes before
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Local storm report, Aug 20, 6:55 PM CDT, 1 minute before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 20, 3:08 PM CDTSevere Thunderstorm WarningGIDFranklin67 min
Aug 20, 3:40 PM CDTSevere Thunderstorm WarningGIDWebster65 min
Aug 20, 3:54 PM CDTSevere Thunderstorm WarningGIDNuckolls, Thayer66 min
Aug 20, 4:09 PM CDTSevere Thunderstorm WarningGIDFranklin51 min
Aug 20, 4:18 PM CDTSevere Thunderstorm WarningGIDNuckolls57 min
Aug 20, 4:33 PM CDTSevere Thunderstorm WarningGIDFranklin, Webster42 min
Aug 20, 5:00 PM CDTSevere Thunderstorm WarningGIDClay33 min
Aug 20, 5:12 PM CDTSevere Thunderstorm WarningGIDNuckolls33 min
Aug 20, 5:16 PM CDTSevere Thunderstorm WarningGIDFillmore, Thayer59 min
Aug 20, 5:44 PM CDTSevere Thunderstorm WarningGIDPolk61 min
Aug 20, 5:54 PM CDTSevere Thunderstorm WarningGIDGreeley, Nance36 min
Aug 20, 6:29 PM CDTSevere Thunderstorm WarningGIDNance46 min
Aug 20, 6:40 PM CDTSevere Thunderstorm WarningGIDYork34 min
Aug 20, 6:43 PM CDTSevere Thunderstorm WarningGIDPolk23 min
Aug 20, 3:09 PM CDTSevere Thunderstorm WarningGIDPhillips36 min
Aug 20, 3:44 PM CDTSevere Thunderstorm WarningGIDPhillips31 min
Aug 20, 4:11 PM CDTSevere Thunderstorm WarningGIDPhillips, Smith49 min
Aug 20, 4:49 PM CDTSevere Thunderstorm WarningGIDPhillips, Rooks56 min
Aug 20, 5:18 PM CDTSevere Thunderstorm WarningGIDJewell, Smith42 min
Aug 20, 5:27 PM CDTSevere Thunderstorm WarningGIDOsborne48 min
Aug 20, 5:35 PM CDTSevere Thunderstorm WarningGIDJewell40 min
Aug 20, 5:38 PM CDTSevere Thunderstorm WarningGIDRooks52 min
Aug 20, 6:05 PM CDTSevere Thunderstorm WarningGIDMitchell25 min
Aug 20, 6:07 PM CDTSevere Thunderstorm WarningGIDJewell23 min
Aug 20, 6:10 PM CDTSevere Thunderstorm WarningGIDOsborne17 min
Aug 20, 6:30 PM CDTSevere Thunderstorm WarningGIDMitchell30 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.