Alert archive / Nebraska / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 195, NWS Omaha, NE

July 12, 2000Lancaster County, Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at Jul 12, 2000, 12:36 AM CDT for Lancaster County, Nebraska. It was in force for 39 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jul 12, 2000, 12:36 AM CDT (05:36 UTC)
Expired: Jul 12, 2000, 1:15 AM CDT
In force: 39 min
Issued by: NWS Omaha, NE
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Lancaster County, NE

The radar

The Omaha radar (KOAX), 65 km from the middle of the area, began a volume at 05:36 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.

What was reported inside it

Time	Report	Where	Remark
Jul 12, 12:49 AM CDT	Thunderstorm Wind 50 E	Lincoln, NE	Thunderstorm wind gust estimated around 60 mph at 40th and Cornhusker in Lincoln.
Jul 12, 12:58 AM CDT	Thunderstorm Wind 60 E	Bennet, NE	Thunderstorm wind gusts estimated at 70 mph caused considerable tree damage from around Bennet to Firth. Although most of the tree damage was done in the Bennet area from around 134th to 162nd streets...a grain silo was toppled in Firth.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

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

Issued	Product	Office	Lasted
Jul 11, 11:00 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 5.6 hours before the alert went out and 65 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: 3053 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 1183 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 53 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 5.8

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 Jul 11, 2:53 PM CDT, 9 hours 43 minutes earlier.

Area forecast discussion, Jul 11, 2:53 PM CDT, 9 hours 43 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
253 PM CDT TUE JUL 11 2000

THE MAIN FORECAST CHALLENGE IS FIRST PERIOD CONVECTION...FOLLOWED BY
TEMPS.

SHORT TERM...VERY MOIST AIR AT LOW LEVELS IS BEGINNING TO
DESTABILIZE ALONG WEAK SFC CONVERGENCE ZONE BETWEEN LNK AND OMA.
WHILE SCT TSTMS ARE LIKELY TO INCREASE IN ERN NE INTO THE
EVENING...I THINK THE MAIN CONVECTIVE THREAT WILL COME FROM SFC
CONVERGENCE ALONG THE FRONT HEADED SEWD OUT OF SD.  THIS MAY BE
ENOUGH TO FORCE DEEPER LIFT OF THE AIR ADVECTING INTO THE FRONTAL
ZONE.  IN ADDITION...ALL MODELS AGREE ON MID LEVEL DRYING BEHIND THE
FRONT...WHICH WILL ALLOW IT TO GENERATE STRONGER OUTFLOW.  SO WILL
THE NW COMPONENT OF MID LEVEL WINDS.  BECAUSE OF THIS...BELIEVE THAT
THE MODELS WEAKEN THE NW FLOW BEHIND THE SYSTEM TOO MUCH OVERNIGHT.
WILL GO FOR MUCH HIGHER POPS THAN GUIDANCE...AND BOOST PREVIOUS
FORECAST BY ABOUT 20 PCT.

AFTER SOME EARLY MORNING LEFTOVERS IN THE SOUTHEAST ZONES WED
MORNING...A DRY FORECAST SETS UP FOR A COUPLE OF PERIODS AS STRONG
MID LEVEL DRYING SHOULD PRECLUDE ANY THUNDERSTORMS FOR A WHILE.
STRONG INSOLATION SHOULD ALLOW TEMPS TO RISE TO AROUND 90 OR LOWER
90S WEDNESDAY...ESPECIALLY SINCE THE COOL ADVECTION BEHIND THE FRONT
IS UNIMPRESSIVE.  DROPPING THE SFC DEW POINTS INTO THE 60S WOULD BE
IMPRESSIVE...BUT EVAPOTRANSPIRATION HAS BEEN SO INTENSE THAT THIS IS
NOT LIKELY IN THE SOUTHEAST ZONES UNTIL PERHAPS WEDNESDAY NIGHT.

AVN MOS IS QUITE A BIT COOLER THAN NGM ON THURSDAY.  WITH RETURN
FLOW SETTING UP AND RISING TEMPS AT ALL LEVELS...I WILL BE LEANING
CLOSE TO THE NGM.  I WILL KEEP TEMPS IN THE LOWER TO MID 90S FOR
NOW...ALTHOUGH IF ETA IS RIGHT ABOUT STRONG SFC TROUGH DEVELOPING
ACROSS SD WITH SW FLOW AT LOW LEVELS GETTING INTO ERN
NEBRASKA...SOME UPPER 90S COULD RESULT.  IN ADDITION...MOISTURE
RETURNING INTO THE HOT AIR IN THE NORTHWEST ZONES ALONG WITH A
POSSIBLE MID LEVEL TROUGH ROTATING AROUND THE RIDGE COULD RESULT IN
A FEW LATE AFTN TSTMS IN THE NORTHWEST ZONES.  THIS IS WORTH A
SLIGHT CHANCE ONLY FOR NOW.

IN THE EXTENDED...POSITION ON THE EAST SIDE OF STRONG UPPER RIDGE I
MAY KEEP US IN THE RING OF FIRE...BUT WARM TEMPS ALOFT SUGGEST
ACTIVITY WILL NOT BE WIDESPREAD.  HOT WITH A SLIGHT CHC OF TSTMS
LOOKS RIGHT WITH LITTLE DAY TO DAY VARIATION.

.OMA...NONE
POLLACK

In the hours before

Special weather statement, Jul 11, 8:35 PM CDT, 4 hours 1 minute before

NEZ011-012-015>018-030>034-042>045-050>053-065>068-078-088>093-
IAZ043-055-056-069-079-080-090-091-121201-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
835 PM CDT TUE JUL 11 2000

...SEVERE WEATHER OUTLOOK FOR EASTERN NEBRASKA AND SOUTHWEST IOWA...

A SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR MUCH OF NORTHEAST
NEBRASKA UNTIL 100 AM CDT.  THE MAIN THREAT IS DAMAGING WIND...BUT
MODERATE SIZE HAIL IS ALSO POSSIBLE.

THERE IS A CHANCE OF THUNDERSTORMS OVER THE REMAINDER OF EASTERN
NEBRASKA AND SOUTHWEST IOWA OVERNIGHT.  ANY STORMS THAT DEVELOP WILL
BE CAPABLE OF PRODUCING VERY HEAVY RAIN AND GUSTY WINDS.  SOME
SMALL HAIL COULD ALSO OCCUR.

MIpLLER

Special weather statement, Jul 11, 10:35 PM CDT, 2 hours 1 minute before

NEZ011-012-017-018-031-032-120350-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
1035 PM CDT TUE JUL 11 2000

...SEVERE THUNDERSTORM WATCH 573 IS NO LONGER IN EFFECT IN THE
FOLLOWING COUNTIES OF NORTHEAST NEBRASKA...

KNOX...CEDAR...PIERCE...WAYNE...MADISON AND STANTON.

THE AREA OF STRONG TO SEVERE THUNDERSTORMS HAS SHIFTED TO THE
SOUTH AND EAST OF THESE AREAS.

MILLER

Local storm report, Jul 12, 12:20 AM CDT, 16 minutes before

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Local storm report, Jul 12, 12:22 AM CDT, 14 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
1220 PM CDT WED JUL 12 2000

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0825 PM    ST HELENA                 NE   60 MPH TSTM GUST
07/11/00   CEDAR                          REPORTED BY STORM
                                          SPOTTER.

0925 PM    (OFK)STEFAN FLD NORFOLK   NE   69 MPH TSTM GUST
07/11/00   MADISON

0939 PM    (OFK)STEFAN FLD NORFOLK   NE   64 MPH TSTM GUST
07/11/00   MADISON

0945 PM    STANTON                   NE   66 MPH TSTM GUST
07/11/00   STANTON                        REPORTED BY EMERGENCY
                                          MANAGEMENT.  DAMAGE TO
                                          TREES AND SIGNS.
                                          MEASURED WIND.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 8:05 PM CDT	Severe Thunderstorm Warning	OAX	Cedar	40 min
Jul 11, 9:21 PM CDT	Severe Thunderstorm Warning	OAX	Cedar	24 min
Jul 11, 9:29 PM CDT	Severe Thunderstorm Warning	OAX	Madison, Stanton	46 min
Jul 11, 9:56 PM CDT	Severe Thunderstorm Warning	OAX	Colfax, Cuming	49 min
Jul 11, 10:03 PM CDT	Severe Thunderstorm Warning	OAX	Thurston	57 min
Jul 11, 10:44 PM CDT	Severe Thunderstorm Warning	OAX	Burt	31 min
Jul 11, 10:46 PM CDT	Severe Thunderstorm Warning	OAX	Cuming, Dodge	29 min
Jul 11, 11:15 PM CDT	Severe Thunderstorm Warning	OAX	Dodge, Douglas, Washington	45 min
Jul 11, 11:15 PM CDT	Severe Thunderstorm Warning	OAX	Saunders	45 min
Jul 12, 1:13 AM CDT	Severe Thunderstorm Warning	OAX	Otoe	47 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2000 Every severe thunderstorm warning in 2000

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.