Alert archive / Nebraska / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 87, NWS Hastings, NE

July 1, 1997Polk County, Nebraska

NWS Hastings, NE issued this severe thunderstorm warning at Jul 1, 1997, 1:18 AM CDT for Polk County, Nebraska. It was in force for 27 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 1, 1997, 1:18 AM CDT (06:18 UTC)
Expired: Jul 1, 1997, 1:45 AM CDT
In force: 27 min
Issued by: NWS Hastings, NE
Area: Whole counties

County Polk County, NE

The radar

The Omaha radar (KOAX), 102 km from the middle of the area, began a volume at 06:20 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, 6.3 hours before the alert went out and 101 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: 900 J/kg
Mixed-layer CIN: -123 J/kg
Mixed-layer LCL: 1531 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 66 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KGRI 010617 RRA
SVRGRI
NEC143-010645-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE HASTINGS NE
118 AM CDT TUE JUL 1 1997
 
THE NATIONAL WEATHER SERVICE IN HASTINGS NE  HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  145 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN EAST CENTRAL NEBRASKA
 
   ...EASTERN POLK COUNTY
 
AT 115 AM...A SEVERE THUNDERSTORM WAS CENTERED 20 MILES NORTH OF YORK
NEAR OSCEOLA MOVING EAST AT 30 MPH...AND WILL REACH SHELBY BY 130 AM.
 
HAIL TO 1 INCH IN DIAMETER AND WIND GUSTS OVER 50 MPH WILL BE POSSIBLE
WITH THIS STORM.
 
PEOPLE IN THE WARNED AREA SHOULD GET INTO A REINFORCED SHELTER FOR
PROTECTION FROM DAMAGING WINDS..6.LARGE HAIL...VERY HEAVY RAIN...AND
DANGEROUS LIGHTNING.
 
GURNEY

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 Jun 30, 3:04 PM CDT, 10 hours 14 minutes earlier.

Area forecast discussion, Jun 30, 3:04 PM CDT, 10 hours 14 minutes before

CENTRAL NEBRASKA/NORTH CENTRAL KANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HASTINGS NE
255 PM CDT MON JUN 30 1997

STORM CHANCES TONIGHT AND TUES AND HOW HOT TO GO TUESDAY ARE THE MAIN
QUESTIONS TODAY.

QSTNRY FRONT NORTH OF CWA OVER SRN SDAK AT 18Z WITH DRY TROF OVR WRN
HIGH PLAINS. ALSO NOTED SOME SORT OF WSHFT LINE IN WRN CWA WITH
SWLY FLOW ODX-LXN WWD AND SELY FLOW TO THE EAST WITH MOISTURE CONVG
OVR SC NEB PER ADAP. LTL SFC CAP LEFT...HWVR H7 TEMPS NEAR CAPPING
THRESHHOLD WITH WAA TAKING PLACE. MORN ANALYSIS ALSO SHOWED PLENTY OF
MOISTURE WITH H8 DWPTS 10-15C. MIDLVL WAA FORMING SOME ACCAS WHILE
FEW CU HAVING TROUBLE. PROFILERS PICKED UP ON WK WAVE H7-H5 OVR WRN
HI PLNS ERLYR TDY...BUT BARELY PERCEPTIBLE ON H20 VAP LOOP.

CONV TEMPS IN THE MID 90S MAY NOT BE REACHED FOR AUTOCONV...BUT AM
CONCERNED ABT WSHFT LINE AND WK WAVE WHICH THE ETA TRAKS ACRS NEB THIS
EVE. NGM AND AVN MOVE IT NORTH. PROFLR POSN AGREES WITH ETA AND THIS
IMPULSE MAY TRIGGER ISOLD-WDLY SCT TRW WHERE CAP WEAKEST OVER ERN CWA.
MIDLVL WARMTH LUKS LIKE IT/S SQUELCHING ALL WITH WAVE NOT ACTIVE TO
WEST ATTM...BUT GIVEN UNCERTAINTY...20 PCT CHC THIS EVE STILL LUKS GOOD
SPLY OVR ERN CWA ON CAP FRINGE. GRIDDED ETA 950-900 MOIST CONVG ALSO
FCST THRU 06Z ALONG DRY TROF WHICH DRIFTS INTO NEB CWA. LLJ GETS GOING
IN 2 AREAS TON...BUT W/O FOCUS OVR KS...MOST ACTIVITY FM THIS WL OCCUR
IN SD. WL TEMPER NC KS POPS A BIT DOWNWARD TON WITH H9-H8 MOIST DVRG
NOTED. PERSISTENCE TEMPS IN THE HUMID AIR BTWN 65-70 LUK RSBL.

TRICKY PART OF FCST COMES TUES AS JET AND PAC CST UPR SYS PUNCHES ACRS
NRN PLAINS WITH DRY TROF/CDFNT MOVG THRU CWA. TIMING WL BE CRITICAL
TO SUCCESS. MDLS IN RSBL AGREEMENT WITH DRY TROF TO MOVE THRU WRN CWA
IN THE AM AND MOSTLY THRU ERN CWA AFTN. WSWLY FLOW UPWRD TO H7 WL
EASILY PROMOTE THIS DRYING TREND WITH H8 THTE RIDGE...AND OPPRESSIVE
SFC DWPTS SHOVED TWD ERN NEB WHERE 98O NAILS MDT RISK. WITH UPR DYNX
WELL NORTH...IT APPEARS THAT PSG OF DRYTROF WL BE WITHOUT INCIDENT
OVR WRN COS IN THE MORNING. HV SOME DOUBT OVR ERN COS AS IT MAY NOT CLR
B4 MAX HTG. ALTHO MEAN RH/S ARE QUITE DRY...SFC-H8 DWPTS STILL QUITE
SUFF FOR RAPID CONVECTION ALONG THESE BNDRYS TUES PM WITH PART OF CWA
IN A THREAT. MILD MIDLVLS WL PREVENT OUTBREAK...SO CURNT SPLIT WITH 20
POPS EAST LUKS QUITE GOOD. HRLY SOUNDINGS BOOST MAX AT HSI/HLC/MCK OVR
100. LUKG AT WND DIR...THIS QUITE PSBL AND WL CONTINUE WITH HOT FCST.

SYS WL HV ENUF PUNCH TO BRING DRIER AIR TO RGN TUES NITE/WEDS AND WL
LEAN TWD COLR FAN FOR LOWS. GUID MAXES SEEM RSBL.

GRI UU 069/098/058/084 2200
HEB UU 069/099/059/084 2200
ODX UU 067/097/056/083 2200
LXN UU 065/095/055/083 2100
BLT UU 070/101/061/087 1200

BREWSTER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 9:54 PM CDT	Severe Thunderstorm Warning	GID	Valley	36 min
Jun 30, 10:33 PM CDT	Tornado Warning	GID	Valley	42 min
Jun 30, 10:46 PM CDT	Severe Thunderstorm Warning	GID	Sherman	44 min
Jun 30, 11:15 PM CDT	Severe Thunderstorm Warning	GID	Greeley, Howard, Valley	45 min
Jun 30, 11:30 PM CDT	Severe Thunderstorm Warning	GID	Sherman	45 min
Jul 1, 12:11 AM CDT	Severe Thunderstorm Warning	GID	Nance	49 min
Jul 1, 1:06 AM CDT	Severe Thunderstorm Warning	GID	Hall	39 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 1997 Every severe thunderstorm warning in 1997

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.