Alert archive / Nebraska / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 318, NWS Omaha, NE

July 2, 2001Pierce County, Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at Jul 2, 2001, 3:31 AM CDT for Pierce 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: Jul 2, 2001, 3:31 AM CDT (08:31 UTC)
Expired: Jul 2, 2001, 4:00 AM CDT
In force: 29 min
Issued by: NWS Omaha, NE
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Pierce County, NE

The radar

The Omaha radar (KOAX), 147 km from the middle of the area, began a volume at 08:33 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, 8.5 hours before the alert went out and 146 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 991 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 70 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 2, 3:20 AM CDT, 11 minutes earlier.

Area forecast discussion, Jul 2, 3:20 AM CDT, 11 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OMAHA NE
320 AM CDT MON JUL 2 2001

THUNDERSTORM THREATS AND TEMPERATURES REMAIN THE MAIN CONCERNS FOR
THIS FORECAST.

IN THE SHORT TERM...AREA OF SLOW MOVING TSTMS WITH HVY RAIN AND
MARGINAL SVR HAIL CONTINUES TO SPREAD TOWARD THE SE.  PER MCD
DISCUSSION...TRIGGER SEEMS TO BE WARM/MOIST ADVECTION AROUND 700 MB
LEVEL...ALTHOUGH NLG PROFILER ALSO SUGGESTED SOME COOLING AND
DESTABILIZATION BETWEEN 700 AND 500 MB.  RUC HAS THIS PATTERN
SHIFTING SE AND WEAKENING BETWEEN 12Z AND 18Z...POSSIBLY REACHING
OMA AREA AND SW IA BEFORE DYING OUT.

MODELS ARE IN DECENT OVERALL AGREEMENT BUT WITH IMPORTANT REGIONAL
SCALE DIFFERENCES IN MASS FIELDS.  ALL DEVELOP A HIGH PW AXIS AROUND
1.7 INCHES ALONG MO RVR IN ERN AND NRN NEB BY 00Z...MOVE IT SOMEWHAT
SE OVERNIGHT...THEN REDEVELOP IT NEAR NE/KS BORDER BY LATER IN THE
DAY TUESDAY.  PATTERNS ALOFT ARE ALSO FAIRLY SIMILAR.  AT THE LOWER
LEVELS...HOWEVER...ETA IS SIMILAR TO NGM IN HAVING A RAPID RETURN OF
WARM AIR AT THE SFC AND 850 MB...DIVERGING ONLY LATER TUESDAY WHEN
IT IS THE ONLY MODEL TO DEVELOP A STRONG SFC LOW OVER CO...AND IS
FARTHEST NORTH WITH THE COLD FRONT IN ERN NEB.  ETA HAS BACKED OFF
SOMEWHAT ON ITS WARMING FROM THE PREVIOUS COUPLE OF RUNS.  WILL TEND
MORE TOWARD THE COOLER AVN SOLUTION ON SFC FEATURES...WHICH WILL
ALSO BE FAIRLY SIMILAR TO PREV FORECAST.

IN EXTENDED...NEW MODELS ARE MUCH MORE PROGRESSIVE IN MOVG UPPER
HIGH EWD FROM ITS ANCHORING POSITION OVER THE 4 CORNERS REGION THAN
ANYTHING PREVIOUS.  NEW MEX GUIDANCE SEEMS TO MATCH RATHER POORLY
WITH MEX GUIDANCE THRU 120 HRS.  WILL LEAVE CURREN:T FORECAST ALONE
UNTIL UNCERTAINTIES CAN BE EVALUATED BETTER...EXCEPT THAT WED NOW
LOOKS MAINLY DRY.

.OMA...NONE
POLLACK

In the hours before

Local storm report, Jul 2, 2:12 AM CDT, 1 hour 19 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
212 AM CDT MON JUL 02 2001

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....1

0158 AM    CREIGHTON                 NE   .88 INCH HAIL
07/02/01   KNOX                           REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

MILLER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 2, 1:45 AM CDT	Severe Thunderstorm Warning	OAX	Knox	45 min
Jul 2, 3:06 AM CDT	Severe Thunderstorm Warning	OAX	Knox, Pierce	24 min
Jul 2, 5:42 AM CDT	Severe Thunderstorm Warning	OAX	Cedar	48 min
Jul 2, 6:43 AM CDT	Severe Thunderstorm Warning	OAX	Cuming	32 min
Jul 2, 7:15 AM CDT	Severe Thunderstorm Warning	OAX	Burt, Cuming, Dodge	45 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.