Alert archive / Nebraska / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 196, NWS Hastings, NE

August 17, 2001Sherman County, Nebraska

NWS Hastings, NE issued this severe thunderstorm warning at Aug 17, 2001, 6:41 PM CDT for Sherman County, Nebraska. It was in force for 49 min. 1 report 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: Aug 17, 2001, 6:41 PM CDT (23:41 UTC)
Expired: Aug 17, 2001, 7:30 PM CDT
In force: 49 min
Issued by: NWS Hastings, NE
Area: Whole counties

County Sherman County, NE

The radar

The Grand Island radar (KUEX), 110 km from the middle of the area, began a volume at 23:44 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
Aug 17, 7:00 PM CDT	Hail 0.75	Litchfield, NE

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
Aug 17, 5:30 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.7 hours before the alert went out and 136 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: 852 J/kg
Mixed-layer CIN: -162 J/kg
Mixed-layer LCL: 1258 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 155 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.6

Open this sounding in Storm Lab

The text

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

421 
WUUS53 KGID 172341
SVRGRI
NEC163-180030-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE HASTINGS NE
641 PM CDT FRI AUG 17 2001

THE NATIONAL WEATHER SERVICE IN HASTINGS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN SHERMAN COUNTY IN CENTRAL NEBRASKA

* UNTIL 730 PM CDT

* AT 639 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 5 MILES NORTH OF LITCHFIELD...OR ABOUT 30 MILES
  SOUTHEAST OF BROKEN BOW...MOVING SOUTHEAST AT 20 MPH.

SOME LOCATIONS IN THE PATH OF THIS STORM INCLUDE HAZARD...ASHTON AND
ROCKVILLE.

PEOPLE IN SHERMAN COUNTY SHOULD SEEK SHELTER IN A STURDY STRUCTURE
AND STAY AWAY FROM WINDOWS. THE PRIMARY SEVERE WEATHER THREAT IS
LARGE HAIL.

$$

GUYER

LAT...LON 4132 9911 4124 9931 4105 9918 4104 9876
          4128 9876

NNNN

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 17, 2:10 PM CDT, 4 hours 31 minutes earlier.

Area forecast discussion, Aug 17, 2:10 PM CDT, 4 hours 31 minutes before

SOUTH CENTRAL NEBRASKA/NORTH CENTRAL KANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HASTINGS NE
210 PM CDT FRI AUG 17 2001

QUESTION FOR THE DAY IS WHETHER CONV WILL FIRE LT THIS AFTN INTO THIS
EVENING.

19Z SFC MAP SHOWS PREFNTL TROUGH ROUGHLY ALG A ONL TO MCK LINE IN
REFLECTION OF UPR TROF DIGGING ACRS SD ATTM. PLUME OF STEEP MID LVL
LAPSE RATES AHD OF THIS FTR COMBINED WITH INCREASING LOW LVL WAA AS
WINDS CONT TO BACK AHD OF UPR TROF...ALL LEADING TO A SMALL BUT
PERSISTENT BAND OF MID LVL CLDS/SHOWERS FM ODX BACK TO W TO BFF.
DESTABILIZATION CONTS UNABATED ACRS MOST OF CWA WITH 18Z TEMPS
RUNNING WELL ABV 12Z GUIDANCE NUMBERS AND DEWPOINTS WELL INTO MID
60S...ALL LEADING TO SIG INSTABILITY THIS AFTN.

12Z ETA/NGM ALG WITH LATEST RUC ALL POINTING TO CONV INITIATION ALG
SFC TROF ARND 21Z ALG A OLU TO EAR LINE. BELIEVE WITH MOST LOCALES
SITTING AT CONV TEMP ALREADY AND DECENT SFC CVRG ALG BNDRY ESP FM
GRI EAST...THINGS SHLD POP. WOULD XPC ACTIVITY TO LINGER INTO MID
EVENING EAST BEFORE PRIMARY COLD FNT ASSOCD/W SIG UPR TROF OVR
MANITOBA SWEEPS PRECIP S AND E. CAA ASSOCD/W COLD FNT LAGGING
THIS AFTN AND IS NOT PROGGED INTO CWA UNTIL SAT AM SO XPC TEMPS
TONIGHT SIMILAR TO LAST NIGHT. HIGHS SAT WILL BE TRICKY GIVEN PROGGED
EARNEST LOW LVL CAA OFFSET BY INSOLATION. GOING NUMBERS IN THE
BALLPARK. BUILDING RIDGE SAT NIGHT WILL LEAD TO COOL NIGHT BUT WARMUP
COMMENCES SUN AS FLW SHIFT S AND UPR RIDGE BEGINS TO BUILD AHD OF
UPSTREAM TROF OVR SW CANADA.

IN THE EXTNDD...MED RANGE MODELS PRETTY SIMILAR WITH EVOLUTION OF
AMPLIFYING UPR TROF ALG THE W COAST AND EWD SHIFT/FLATTENING OF UPR
RIDGE INTO THE PLAINS. THIS WOULD FAVR PERSISTENT LEE SIDE TROF AND
NIGHTLY MCS CLUSTERS TIED TO NOCTURNAL JET. AT THIS POINT...ITS
FRIVOLOUS TO TRY AND PIN ANYTHING DOWN AND WILL BROAD-BRUSH TUE-THU
TIME FRAME. HWVR MORE CONFIDENT THAT AS RIDGE SHIFTS E...AND NAO
CONTS IN INCREASINGLY POSITIVE PHASE...THAT RTN TO ABV NORMAL TEMPS
IN STORE FOR CWA.

.GID...NONE.

TEH

In the hours before

Local storm report, Aug 17, 5:40 PM CDT, 1 hour 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HASTINGS NE
540 PM CDT FRI AUG 17 2001

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

0525 PM    10 W PLEASANTON           NE    1.75 INCH HAIL
08/17/01   BUFFALO

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 17, 5:02 PM CDT	Severe Thunderstorm Warning	GID	Buffalo	43 min
Aug 17, 5:55 PM CDT	Severe Thunderstorm Warning	GID	Howard	50 min
Aug 17, 6:15 PM CDT	Severe Thunderstorm Warning	GID	Hall	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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.