Alert archive / Nebraska / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 93, NWS North Platte, NE

May 30, 1998Sheridan County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at May 30, 1998, 12:41 AM MDT for Sheridan 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 counties it named.

The facts

Issued
May 30, 1998, 12:41 AM MDT (06:41 UTC)
Expired
May 30, 1998, 1:30 AM MDT
In force
49 min
Issued by
NWS North Platte, NE
Area
Whole counties

County Sheridan County, NE

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
May 29, 9:15 PM MDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 6.7 hours before the alert went out and 178 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-pSkew-T log-p diagram, Rapid City, SD at 00:00Z on 1998-05-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 556 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Rapid City, SD at 00:00Z on 1998-05-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 150 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
556 J/kg
Mixed-layer CIN
-202 J/kg
Mixed-layer LCL
1826 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
150 m²/s²
0-3 km storm-relative helicity
291 m²/s²
Significant tornado parameter
0.0
Supercell composite
13.5

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KLBF 300640 RRA
SVRLBF
NEC161-300730-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
141 AM CDT (1241 AM MDT) SAT MAY 30 1998

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME NORTHWESTERN SHERIDAN COUNTY IN THE NEBRASKA PANHANDLE

* UNTIL 130 AM MDT (230 AM CDT)

* AT 1240 AM MDT... NORTH PLATTE DOPPLER RADAR INDICATED A SEVERE
  THUNDERSTORM 14 MILES EAST NORTHEAST OF CHADRON OR 11 MILES WEST
  SOUTHWEST OF WHITE CLAY MOVING EAST AT 30 MPH.

* DAMAGING HAIL AND/OR DESTRUCTIVE WINDS CAN BE EXPECTED NEAR...
  WHITE CLAY                   BY 100 AM MDT

DAMAGING WINDS AND LARGE HAIL ARE LIKELY. xGO INSIDE A STURDY
BUILDING AND STAY AWAY FROM WINDOWS!

MTM

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 North Platte, NE wrote its last area forecast discussion before this severe thunderstorm warning went out at May 29, 2:08 PM MDT, 10 hours 33 minutes earlier.

Area forecast discussion, May 29, 2:08 PM MDT, 10 hours 33 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTH PLATTE NE
308 PM CDT FRI MAY 29 1998

FORECAST PROBLEMS ARE POPS AND TEMPERATURES

CURRENT KLNX RADAR DOES NOT INDICATE ANY THUNDERSTORM DEVELOPMENT.
SATELLITE HINTS AT SOME POSSIBLE CONVECTION STARTING IN NORTHEAST
COLORADO. THE 18Z SURFACE CHART SHOWS TWO BOUNDARIES...A COLD FRONT
ACROSS THE NORTHERN NEBRASKA BORDER AND THE STATIONARY FRONT ACROSS
CENTRAL NEBRASKA.

THE MODELS INITIALIZED WELL WITH WATER VAPOR BUT THE ETA/AVN ARE IN
BETTER AGREEMENT THAN THE NGM. THE NGM IS FASTER AND FURTHER NORTH WITH
THE LOW WHICH IS ITS TYPICAL BIAS. THE RIDGE OVER THE PLAINS MOVES EAST
OVER THE MISSOURI VALLEY BY 36 HOURS. AT THAT TIME SPLIT FLOW BEGINS TO
AFFECT THE FA. THE COLD FRONT OVER THE NORTHERN NEBRASKA BORDER WILL BE
THE FOCUS FOR THUNDERSTORMS TONIGHT ALONG WITH ANOTHER NEARLY
STATIONARY BOUNDARY ACROSS CENTRAL NEBRASKA WHERE DEWPOINTS ARE IN THE
UPPER 50S AND LOW 60S. ETA GRIDDED DATA INDICATES Q-G FORCING AND UPWARD
VERTICAL VELOCITIES AS A SHORTWAVE MOVES OVER THE FA TONIGHT. THE
THETA-E RIDGE IS ALSO OVER THE FA ALONG WITH CAPE RANGING FROM
2000-3000 J/KG. SOME FORCING EXISTS IN THE NORTHEAST DURING THE
AFTERNOON ON SATURDAY BUT SHIFTS EAST OF THE FA BY EVENING. BY 12Z
SUNDAY DYNAMICS SHIFT EVEN FURTHUR EAST AS THE LOW MOVES FROM NORTHEAST
NEBRASKA INTO SOUTHERN IOWA.

WILL FOLLOW THE FAN GUIDANCE FOR TEMPERATURES WITH COOLER AIR MOVING
INTO THE FA BY SUNDAY. THICKNESSES DROP 120 METERS AND 850 TEMPERATURES
FALL AROUND 7 DEGREES C WHICH IS MORE IN LINE WITH THE FAN.

PRELIMINARY GUIDANCE FOR COORDINATION ONLY. OFFICIAL FORECASTS ARE
CONTAINED WITHIN PRODUCT OMAZFPNE...

CCF
LBF UU 057/087 052/079 048 5--
OGA UU 055/086 050/078 049 5--
IML UU 058/089 053/081 050 5--
VTN UU 056/084 054/074 049 5--
ONL UU 060/086 056/078 050 53-
ANW UU 059/085 055/076 049 53-
BBW UU 060/087 054/079 049 52-

FS

The office that day

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

IssuedProductOfficeCountiesLasted
May 30, 1:12 AM MDTSevere Thunderstorm WarningLBFCherry63 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 1998Every severe thunderstorm warning in 1998

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.