Alert archive / Nebraska / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 189, NWS Hastings, NE

July 30, 2002Polk County, York County, Nebraska

NWS Hastings, NE issued this severe thunderstorm warning at Jul 30, 2002, 12:56 PM CDT for Polk County, York County, Nebraska. It was in force for 49 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 30, 2002, 12:56 PM CDT (17:56 UTC)
Expired: Jul 30, 2002, 1:45 PM CDT
In force: 49 min
Issued by: NWS Hastings, NE
Area: Counties, with a storm outline in the text

Counties Polk County, NE, York County, NE

The radar

The Omaha radar (KOAX), 96 km from the middle of the area, began a volume at 17:59 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 5.9 hours before the alert went out and 264 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: 1420 J/kg
Mixed-layer CIN: -326 J/kg
Mixed-layer LCL: 2219 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 186 m²/s²
0-3 km storm-relative helicity: 193 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

768 
WUUS53 KGID 301756
SVRGRI
NEC143-185-301845-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE HASTINGS NE
1255 PM CDT TUE JUL 30 2002

THE NATIONAL WEATHER SERVICE IN HASTINGS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME SOUTHEASTERN POLK COUNTY IN EAST CENTRAL NEBRASKA          
  EXTREME NORTHEASTERN YORK COUNTY IN EAST CENTRAL NEBRASKA

* UNTIL 145 PM CDT

* AT 1252 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 4 MILES NORTH OF GRESHAM...OR ABOUT 18 MILES
  NORTHEAST OF YORK...MOVING SOUTHEAST AT 15 MPH.

SOME LOCATIONS IN THE PATH OF THIS SEVERE STORM INCLUDE GRESHAM...AND
RURAL SECTIONS OF EXTREME SOUTHEAST POLK AND NORTHEAST YORK COUNTIES 
ALONG AND EAST OF HIGHWAY 69. 

PEOPLE IN SOUTHEASTERN POLK AND NORTHEASTERN YORK COUNTIES SHOULD
SEEK SHELTER IN A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

THE PRIMARY SEVERE WEATHER THREAT IS LARGE HAIL THE SIZE OF QUARTERS
BUT ALSO WIND GUSTS TO 60 MPH.

THIS WARNING REPLACES THE WARNING PREVIOUSLY ISSUED FOR POLK COUNTY.

LAT...LON 4106 9752 4092 9737 4114 9739

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 Jul 30, 2:46 AM CDT, 10 hours 10 minutes earlier.

Area forecast discussion, Jul 30, 2:46 AM CDT, 10 hours 10 minutes before

SOUTH CENTRAL NEBRASKA/NORTH CENTRAL KANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HASTINGS NE
246 AM CDT TUE JUL 30 2002

WARM TEMPS THE NEXT COUPLE OF DAYS AND TSTM CHCS ARE THE MAIN CONCERNS

EVENING UPPER AIR ANALYSIS PLACED 120KT H3 JET ACROSS BRITISH COLUMBIA.
OVERALL FLOW WAS ZONAL ACROSS THE NORTHERN HALF OF THE CONUS WITH HIGH
PRESSURE IN THE SOUTHWEST US...AND A LOW IN THE FAR SOUTH.  SHORTWAVE
TROF TRANSLATING ACROSS THE NORTHERN PLAINS WILL BRING SFC BOUNDARY
INTO NORTHERN NEBRASKA THIS AFTERNOON.  THERE IS A SLIGHT CHC OF TSTM
DEVELOPMENT ALONG THE BOUNDARY THIS AFTN/EVENING IN OUR NORTHEAST CWA
WHILE WARM H7 TEMPS OF 14-16C SHLD INHIBIT STORMS TO THE WEST.  LATEST
SWODY1 HAS PLACED OUR NORTHEAST COUNTIES IN THE SLIGHT RISK CATEGORY.
IF STORMS DEVELOP...MAIN HAZARD WOULD BE WIND WITH HAIL A SECONDARY
CONCERN.  OTHERWISE...TEMPS SHLD BE RATHER WARM AGAIN WITH HIGHS
GENERALLY UPPER 90S TO AROUND 100F.

THE HOT TEMPS WILL PERSIST THROUGH WEDNESDAY AHEAD OF COOL FRONT.  ETA
H85 TEMP PROGS 28-33C E/W ACROSS THE CWA WHICH SUGGESTS HIGHS IN THE
TRIPLE DIGITS.  THIS IS ALREADY REFLECTED IN FCST WITH MAX TEMPS
100-105F.  AVN DEVELOPS PCPN WED NIGHT AS BOUNDARY BEGINS TO SAG
SOUTH...HOWEVER BELIEVE WARM MID LEVEL TEMPS WILL AGAIN SUPPRESS ANY
TSTM ACTIVITY UNTIL THURSDAY AS UPPER ENERGY TRANSLATES FURTHER
SOUTH...AND HEIGHTS LOWER...ALLOWING CAP TO WEAKEN.  WITH BETTER UPPER
SUPPORT AND NOW MORE CONSISTENCY IN MODELS WITH FRONTAL POSITION
THURSDAY NIGHT...WILL INCREASE POPS THURS NIGHT TO 30 PCNT.

AVN IS TRENDING WETTER WITH FCST INTO THE WEEKEND...SHOWING A SERIES OF
SHORTWAVE TROFS LIFTING OUT OF THE SOUTHERN ROCKIES AND ONTO THE
PLAINS.  AT THIS POINT...WILL CONTINUE TO MONITOR TRENDS OF THIS AND
MAINTAIN A DRY FORECAST.  THE LATEST MRF HAS DONE AN ABOUT FACE WITH
THE PREVIOUS RUN SHOWING A MORE AMPLITUDE PATTERN WITH A RIDGE OVER THE
ROCKIES AND TROF FROM THE GREAT LAKES THRU THE OHIO VALLEY.
SUBSEQUENTLY...THE LATEST NUMERICAL GUIDANCE HAS TRENDED COOLER IN THE
EXTENDED.  AT THIS POINT WILL NOT FLIP FLOP AND WILL LEAVE THE EXTENDED
AS IS AND WATCH FOR LATER TRENDS.

.GID...NONE.

FAY

In the hours before

Local storm report, Jul 30, 11:01 AM CDT, 1 hour 55 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HASTINGS NE
1101 AM CDT TUE JUL 30 2002

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

1055 AM    GENOA                     NE   1 INCH HAIL
07/30/02   NANCE

Special weather statement, Jul 30, 11:45 AM CDT, 1 hour 11 minutes before

KSZ005>007-017>019-NEZ039>041-046>049-060>064-072>077-082>087-312300-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HASTINGS NE
1145 AM CDT TUE JUL 30 2002

...SPOTTER ACTIVATION SHOULD NOT BE NEEDED ACROSS SOUTH CENTRAL
NEBRASKA AND NORTH CENTRAL KANSAS THROUGH TONIGHT...

THERE IS A SLIGHT CHANCE OF THUNDERSTORMS THIS AFTERNOON AND EVENING
NORTH OF HIGHWAY TWO TO GRAND ISLAND...AND THEN EAST TO YORK.

A SURFACE TROUGH...THAT STRETCHES FROM A WEAK LOW PRESSURE CENTER IN
SOUTHEASTERN SOUTH DAKOTA...DOWN TO NORTH CENTRAL KANSAS...WILL REMAIN
NEAR THE FORECAST AREA THROUGH THIS EVENING...HELPING TO PROVIDE THE
FOCUS FOR THUNDERSTORM DEVELOPMENT...AS A WEAK UPPER LEVEL DISTURBANCE
ALSO MOVES OVER THE REGION. ALTHOUGH THUNDERSTORM ACTIVITY IS NOT
EXPECTED TO BE WIDESPREAD...AN ISOLATED STORM COULD PRODUCE STRONG
WINDS AND HAIL TO ONE INCH IN SIZE.

OTHERWISE...SOUTH OF THIS AREA THUNDERSTORMS ARE NOT EXPECTED NOT FORM
DUE TO VERY WARM MID LEVEL TEMPERATURES.

10

Special weather statement, Jul 30, 11:45 AM CDT, 1 hour 11 minutes before

KSZ005>007-017>019-NEZ039>041-046>049-060>064-072>077-082>087-312300-

HAZARDOUS WEATHER OUTLOOK...CORRECTED
NATIONAL WEATHER SERVICE HASTINGS NE
1145 AM CDT TUE JUL 30 2002

CORRECTED WORDING

...SPOTTER ACTIVATION SHOULD NOT BE NEEDED ACROSS SOUTH CENTRAL
NEBRASKA AND NORTH CENTRAL KANSAS THROUGH TONIGHT...

THERE IS A SLIGHT CHANCE OF THUNDERSTORMS THIS AFTERNOON AND EVENING
NORTH OF HIGHWAY TWO TO GRAND ISLAND...AND THEN EAST TO YORK.

A SURFACE TROUGH...THAT STRETCHES FROM A WEAK LOW PRESSURE CENTER IN
SOUTHEASTERN SOUTH DAKOTA...DOWN TO NORTH CENTRAL KANSAS...WILL REMAIN
NEAR THE FORECAST AREA THROUGH THIS EVENING...HELPING TO PROVIDE THE
FOCUS FOR THUNDERSTORM DEVELOPMENT...AS A WEAK UPPER LEVEL DISTURBANCE
ALSO MOVES OVER THE REGION. ALTHOUGH THUNDERSTORM ACTIVITY IS NOT
EXPECTED TO BE WIDESPREAD...AN ISOLATED STORM COULD PRODUCE STRONG
WINDS AND HAIL TO ONE INCH IN SIZE.

OTHERWISE...SOUTH OF THIS AREA THUNDERSTORMS ARE NOT EXPECTED TO FORM
DUE TO VERY WARM MID LEVEL TEMPERATURES.

10

Local storm report, Jul 30, 12:29 PM CDT, 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HASTINGS NE
1229 PM CDT TUE JUL 30 2002

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

1226 PM    SHELBY                    NE   1.75 INCH HAIL
07/30/02   POLK                           REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 10:30 AM CDT	Severe Thunderstorm Warning	GID	Nance	45 min
Jul 30, 12:17 PM CDT	Severe Thunderstorm Warning	GID	Polk	43 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2002 Every severe thunderstorm warning in 2002

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.