Alert archive / Nebraska / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 441, NWS Omaha, NE

September 23, 2008Jefferson County, Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at Sep 23, 2008, 11:46 PM CDT for Jefferson County, Nebraska. It was in force for 29 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: Sep 23, 2008, 11:46 PM CDT (04:46 UTC)
Expired: Sep 24, 2008, 12:15 AM CDT
In force: 29 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon

County Jefferson County, NE

The radar

The Grand Island radar (KUEX), 111 km from the middle of the area, began a volume at 04:48 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

Omaha, NE (KOAX), launched 00:00Z, 4.8 hours before the alert went out and 143 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: 971 J/kg
Mixed-layer CIN: -58 J/kg
Mixed-layer LCL: 1009 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 100 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.3

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 Omaha, NE wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 23, 4:11 PM CDT, 7 hours 35 minutes earlier.

Area forecast discussion, Sep 23, 4:11 PM CDT, 7 hours 35 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
411 PM CDT TUE SEP 23 2008

.DISCUSSION...FRONT PUSHING THROUGH AREA NOW WITH MORE NORTHERN
PORTIONS OF CONVECTIVE LINE MOVING EAST FASTER THAN NEAR KS BORDER.
STRONG AND ISOLD SVR TSTMS LIKELY THE NEXT FEW HRS MAINLY IN SE
NEB AND SW IA UNTIL INSTABILITY DECREASES AFT 00Z. HIGH PRESSURE
WILL BRING CLEARING SKIES AND COOLER TEMPS TO THE NORTH WHILE
SHOWERS AND TSTMS LINGER JUST SOUTH OF THE BORDER LATER TONIGHT.

THERE WILL BE A SLIGHT CHANCE OF TSTMS IN THE FAR SOUTH IN RETURN
FLOW ON WED. BETTER MOISTURE AND LIFT MOVE ACROSS THE AREA WED
NIGHT AS LLJ DEVELOPS AND FRONT JUMPS BACK INTO THE NORTHERN PLAINS.
INCREASED OVERNIGHT POPS SUBSTANTIALLY...ESPECIALLY IN THE NORTHEAST.

A FEW SHOWERS MAY LINGER INTO THU MORNING...THEN RIDGING ALOFT
WILL RESULT IN AT LEAST A COUPLE DAYS OF WARM DRY WEATHER.  A
MINOR WAVE IN THE NORTHERN PLAINS SHOULD DRIVE A FAIRLY WEAK FRONT
ACROSS THE AREA FRIDAY NIGHT INTO EARLY SAT. FRONT WILL LIKELY PASS
THROUGH DRY AT OUR LATITUDE AS RIDGE IS STILL FAIRLY STRONG ALOFT.

WESTERLIES BUCKLE MORE STRONGLY LATE WEEKEND INTO EARLY NEXT WEEK.
A STRONG UPPER LOW IN THE NORTHEAST PACIFIC SHARPENS A DOWNSTREAM
RIDGE IN WESTERN NORTH AMER...AND A TROUGH IN EASTERN NORTH AMER.
A STRONGLY DIGGING SHORT WAVE WILL PROVIDE AT LEAST A SLIGHT CHC
OF TSTMS SUNDAY NIGHT INTO MONDAY FOLLOWED BY DRIER AND COOLER TEMPS.
JUST HOW COOL IS UNCERTAIN...BUT IT IS CLEAR THAT THE BRUNT OF THE
COLDER AIR WILL BE WELL TO OUR EAST.

&&

.AVIATION...
FOR TAF SITES KOMA/KLNK/KOFK THROUGH 24/18Z.

LINGERING MVFR COND/TSRA ACTIVITY EXPECTED THRU ABOUT 00Z AT
KOMA/KLNK ASSOCIATED WITH FROPA THRU ERN NEB THIS AFTN. AFT
00Z...OUTLOOK IS VFR ALL TAF SITES THRU THE PD.

&&

.OAX WATCHES/WARNINGS/ADVISORIES...
NE...NONE.
IA...NONE.
&&

DEE/POLLACK

Hazardous weather outlook, Sep 23, 5:23 PM CDT, 6 hours 23 minutes before

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In the hours before

Local storm report, Sep 23, 5:47 PM CDT, 5 hours 59 minutes before

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Local storm report, Sep 23, 5:51 PM CDT, 5 hours 55 minutes before

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Local storm report, Sep 23, 6:43 PM CDT, 5 hours 3 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 23, 7:45 PM CDT	Severe Thunderstorm Warning	OAX	Lancaster, Otoe	30 min
Sep 23, 10:40 PM CDT	Severe Thunderstorm Warning	OAX	Cass	35 min
Sep 23, 10:53 PM CDT	Severe Thunderstorm Warning	OAX	Jefferson	52 min
Sep 24, 6:44 AM CDT	Dense Fog Advisory	OAX	Burt, Butler, Cass, Dodge, Douglas, Lancaster and 4 more	4 hr
Sep 24, 3:12 PM CDT	Dense Fog Advisory	OAX	Boone, Burt, Butler, Cass, Colfax, Cuming and 18 more	12 hr
Sep 23, 7:03 PM CDT	Severe Thunderstorm Warning	OAX	Page	27 min
Sep 23, 7:22 PM CDT	Severe Thunderstorm Warning	OAX	Fremont, Mills	23 min
Sep 23, 8:46 PM CDT	Severe Thunderstorm Warning	OAX	Fremont, Mills	29 min
Sep 23, 9:15 PM CDT	Severe Thunderstorm Warning	OAX	Mills	30 min
Sep 23, 9:41 PM CDT	Severe Thunderstorm Warning	OAX	Mills, Montgomery, Pottawattamie	49 min
Sep 23, 10:59 PM CDT	Severe Thunderstorm Warning	OAX	Mills, Montgomery	31 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2008 Every severe thunderstorm warning in 2008

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.