Alert archive / Nebraska / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 75, NWS Cheyenne, WY

July 18, 1990Dawes County, Sheridan County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 18, 1990, 3:11 PM MDT for Dawes County, Sheridan County, Nebraska. It was in force for 64 min.

The area

The counties it named.

The facts

Issued: Jul 18, 1990, 3:11 PM MDT (21:11 UTC)
Expired: Jul 18, 1990, 4:15 PM MDT
In force: 64 min
Issued by: NWS Cheyenne, WY
Area: Whole counties

Counties Dawes County, NE, Sheridan County, NE

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 9.2 hours before the alert went out and 244 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: 1500 J/kg
Mixed-layer CIN: -294 J/kg
Mixed-layer LCL: 1796 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 35 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.

000 
TTAA00 KBFF 182111
SVRBFF
NEC045-161-182215-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING 
NATIONAL WEATHER SERVICE SCOTTSBLUFF NE
311 PM MDT WED JUL 18 1990

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 415 PM MDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES

   IN THE PANHANDLE OF NEBRASKA
      EASTERN DAWES...WESTERN SHERIDAN

AT 310 PM MDT...RADAR INDICATED A SEVERE THUNDERSTORM 14 MILES
SOUTH OF CHADRON NEBRASKA MOVING TO THE NORTHEAST AT 25 MILES AN
HOUR.

PREPARE FOR LARGE HAIL...DAMAGING WIND...HEAVY RAIN AND DANGEROUS
LIGHTNING BY TAKING COVER.  STAY AWAY FROM AREAS WHERE LOOSE ITEMS
CAN BECOME DANGEROUS FLYING DEBRIS.

IF THREATENING WEATHER APPROACHES...TAKE SHELTER INSIDE A REINFORCED
BUILDING.  STAY AWAY FROM WINDOWS.  A BASEMENT...INTERIOR HALLWAY...
OR A ROOM ON THE LOWEST FLOOR IS THE SAFEST PLACE IN MOST BUILDINGS.
MOTORISTS SHOULD AVOID LOW WATER CROSSINGS.

WIRTH

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.

In the hours before

Special weather statement, Jul 18, 2:48 PM MDT, 23 minutes before

NEZ001-182200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SCOTTSBLUFF NE
248 PM MDT MON JUL 16 1990

...THUNDERSTORMS CONTINUED OVER THE WESTERN NEBRASKA PANHANDLE...

AT 245 PM MDT...STRONG THUNDERSTORMS CONTINUED TO DEVELOP OVER THE
NORTHERN NEBRASKA PANHANDLE FROM 25 MILES NORTHWEST OF ALLIANCE NEBRASKA
TO 10 MILES EAST OF CHADRON NEBRASKA.  THESE STORMS WERE MOVING
NORTHEAST AT 25 MPH.

BRIEF HEAVY RAIN...GUSTY WIND...AND HAIL ARE LIKELY ACROSS NORTHERN
BOX BUTTE...EASTERN DAWES AND WESTERN SHERIDAN COUNTIES OF THE NEBRASKA
PANHANDLE UNTIL 4 PM MDT.
PEEK

The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 18, 3:52 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Dawes, Sheridan	68 min
Jul 18, 4:04 PM MDT	Tornado Warning	CYS	Box Butte	26 min
Jul 18, 4:29 PM MDT	Tornado Warning	CYS	Box Butte	31 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 1990 Every severe thunderstorm warning in 1990

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.