Alert archive / Nebraska / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 63, NWS Omaha, NE

April 11, 2001Jefferson County, Saline County, Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at Apr 11, 2001, 1:41 AM CDT for Jefferson County, Saline County, Nebraska. It was in force for 64 min. 5 reports came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: Apr 11, 2001, 1:41 AM CDT (06:41 UTC)
Expired: Apr 11, 2001, 2:45 AM CDT
In force: 64 min
Issued by: NWS Omaha, NE
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Jefferson County, NE, Saline County, NE

What was reported inside it

Time	Report	Where	Remark
Apr 11, 1:50 AM CDT	Thunderstorm Wind 60 E	Endicott, NE	Thunderstorm winds did tree damage and downed power lines around Endicott. Some roofs were also severely damaged.
Apr 11, 1:50 AM CDT	Thunderstorm Wind 60 E	Fairbury, NE	Thunderstorm winds blew a roof off of a home near Fairbury.
Apr 11, 2:10 AM CDT	Hail 0.75	Fairbury, NE
Apr 11, 2:10 AM CDT	Hail 1.75	Thompson, NE
Apr 11, 2:10 AM CDT	Thunderstorm Wind 60 E	Thompson, NE	Thunderstorm wind gusts of 60 to 80 mph were estimated by the Emergency Manager just north of Thompson. Hail up to golf ball size accompanied the wind.

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 nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 6.7 hours before the alert went out and 122 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: 18 J/kg
Mixed-layer CIN: -145 J/kg
Mixed-layer LCL: 493 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 131 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS53 KOAX 110644
SVROMA
NEC095-151-110745-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE OMAHA NE
141 AM CDT WED APR 11 2001

THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  JEFFERSON COUNTY IN SOUTHEAST NEBRASKA
  SALINE COUNTY IN SOUTHEAST NEBRASKA

* UNTIL 245 AM CDT

* AT 139 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SEVERE THUNDERSTORMS WITH DAMAGING WIND FROM 25 MILES WEST OF
  DAYKIN TO 27 MILES SOUTH OF REYNOLDS...OR FROM 41 MILES SOUTHEAST
  OF HASTINGS TO 55 MILES SOUTHWEST OF BEATRICE...MOVING NORTHEAST AT
  55 MPH.

* SOME LOCATIONS AFFECTED...
  DAYKIN...DILLER...ENDICOTT...HARBINE
  DORCHESTER...FRIEND...DE WITT...WILBER
  CRETE

THIS IS A DANGEROUS STORM. TAKE SHELTER ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. KEEP AWAY FROM WINDOWS AND GLASS DOORS.

THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WINDS ACROSS NORTHERN 
KANSAS...AND WINDS OF 60 TO 80 MPH ARE LIKELY.

A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA UNTIL 7 AM 
CDT. 

LAT...LON 4070 9736 4033 9736 4001 9735 4003 9690
          4038 9689 4070 9693

MEAD

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 Apr 10, 3:06 PM CDT, 10 hours 35 minutes earlier.

Area forecast discussion, Apr 10, 3:06 PM CDT, 10 hours 35 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OMAHA NE
306 PM CDT TUE APR 10 2001

PRIMARY CONCERNS ARE SEVERE WEATHER POTENTIAL THROUGH
WED...RAINFALL...TEMPS...AND WINDS AS A MAJOR CYCLONE MOVES
NORTHEAST ACROSS THE AREA.

IN THE SHORT TERM...VERY MOIST AND UNSTABLE AIR FROM AMA N.E. TO TOP
AT 850 MB WAS UNDERESTIMATED BY MODELS.  ETA AGAIN SEEMS TO LOSE
SOME OF THE MOISTURE WHILE AVN REMAINS MOIST.  THIS AIR ADVECTING
NWD UNDER A SERIES OF RIPPLES IN THE UPPER JET HAS RESULTED IN
REPEAT TSTM DEVELOPMENT AND SLOWED TIEH NWD ADVANCE OF THE WARM
FRONT.  AS THIS PROCESS IS LIKELY TO CONTINUE WITH UPPER DIFL LIKELY
INCREASING AHEAD OF MAIN LOW OVERNIGHT...THE PROSPECTS FOR SVR WX
WILL CONTINUE.  ALSO THINK THE MODELS WILL REMAIN TOO FAST WITH THE
WARM FRONT.  FLOODING IS POSSIBLE...BUT STORMS SHOW FAST
MOVEMENT...SO WILL NOT HEADLINE FOR NOW.

ETA AND AVN ARE IN EXCELLENT AGREEMENT ON POSITIONS OF LOW AT SFC
AND ALOFT THRU 36 HRS...WITH ETA FASTER AFTER THAT.  DESPITE THESE
SIMILARITIES...THE AVN IS FASTER IN LIFTING THE DRY SLOT INTO OUR
AREA WEDNESDAY.  WILL TAKE A COMPROMISE SOLUTION.

WIND WILL ALSO BE A PROBLEM WED AND WED NIGHT AS THE STRONG LOW
MOVES THROUGH ERN NEB THEN MN.  GRADIENT DOES NOT LOOK QUITE AS
TIGHT AS LAST SYSTEM...SO FAR.  WINDS SHOULD DIE OUT GRADUALLY ON
THU AS WINDS ARE COUNTERACTED BY A DYING GRADIENT.

THU. NIGHT LOOKS COOL AND DRY PER GUIDANCE...WITH NO BIG CHANGES TO
EXTENDED.

.OMA...NONE.
POLLACK

In the hours before

Local storm report, Apr 10, 7:53 PM CDT, 5 hours 48 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
753 PM CDT TUE APR 10 2001

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

1145 AM    OMAHA                     NE   .75 INCH HAIL
04/10/01   DOUGLAS                        HAIL COVERED THE GROUND
                                          AT 156TH AND F.
                                          REPORTED BY PUBLIC.

1155 AM    LA VISTA                  NE   .75 INCH HAIL
04/10/01   SARPY                          84TH AND BRENTWOOD.
                                          REPORTED BY PUBLIC.

1200 PM    COUNCIL BLUFFS            IA   1.5 INCH HAIL
04/10/01   POTTAWATTAMIE                  REPORTED BY PUBLIC.

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 10, 9:23 PM CDT	Severe Thunderstorm Warning	OAX	Boone	37 min
Apr 10, 10:00 PM CDT	Severe Thunderstorm Warning	OAX	Boone, Madison, Platte	45 min
Apr 10, 10:47 PM CDT	Severe Thunderstorm Warning	OAX	Madison, Platte, Stanton	43 min
Apr 10, 11:11 PM CDT	Severe Thunderstorm Warning	OAX	Colfax, Cuming, Stanton	39 min
Apr 10, 11:46 PM CDT	Tornado Warning	OAX	Cuming, Thurston	29 min
Apr 11, 12:20 AM CDT	Severe Thunderstorm Warning	OAX	Burt, Cuming, Thurston	40 min
Apr 11, 1:15 AM CDT	Severe Thunderstorm Warning	OAX	Madison, Platte	45 min
Apr 11, 2:12 AM CDT	Severe Thunderstorm Warning	OAX	Gage	63 min
Apr 11, 2:28 AM CDT	Severe Thunderstorm Warning	OAX	Burt, Cuming, Dodge	32 min
Apr 11, 2:34 AM CDT	Severe Thunderstorm Warning	OAX	Lancaster	56 min
Apr 11, 2:38 AM CDT	Severe Thunderstorm Warning	OAX	Johnson, Pawnee	52 min
Apr 11, 2:51 AM CDT	Severe Thunderstorm Warning	OAX	Otoe	54 min
Apr 11, 2:58 AM CDT	Severe Thunderstorm Warning	OAX	Nemaha, Richardson	62 min
Apr 11, 3:10 AM CDT	Severe Thunderstorm Warning	OAX	Cass	50 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2001 Every severe thunderstorm warning in 2001

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.