Alert archive / Oregon / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 21, NWS Medford, OR

July 22, 1998Klamath County, Oregon

NWS Medford, OR issued this severe thunderstorm warning at Jul 22, 1998, 8:54 PM PDT for Klamath County, Oregon. It was in force for 46 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 22, 1998, 8:54 PM PDT (03:54 UTC)
Expired
Jul 22, 1998, 9:40 PM PDT
In force
46 min
Issued by
NWS Medford, OR
Area
Whole counties

County Klamath County, OR

The nearest sounding before it

Medford/Jackson, OR (KMFR), launched 00:00Z, 3.9 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-pSkew-T log-p diagram, Medford/Jackson, OR at 00:00Z on 1998-07-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1074 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, Medford/Jackson, OR at 00:00Z on 1998-07-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -12 square meters per square second.1939Sfc1 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
1074 J/kg
Mixed-layer CIN
-122 J/kg
Mixed-layer LCL
2426 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
-12 m²/s²
0-3 km storm-relative helicity
65 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.

174 
WUUS1 KMFR 230355 RRA
SVRMFR
ORC035-230430-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MEDFORD OR
854 PM PDT WED JUL 22 1998

THE NATIONAL WEATHER SERVICE IN MEDFORD HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL KLAMATH COUNTY IN SOUTH CENTRAL OREGON

* UNTIL 940 PM PDT

* AT 850 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED TWO
  SEVERE THUNDERSTORMS. ONE STORM WAS 5 MILES NORTH OF SPRAGUE
  RIVER...AND THE OTHER STORM WAS OVER BONANZA. THESE STORMS WERE
  DRIFTING WEST AT 5 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  SPRAGUE RIVER AT 910 PM

  AND REMAIN IN THE BONANZA AREA

LARGE HAIL AND VERY HEAVY RAIN ARE LIKELY. GO INSIDE A STURDY
BUILDING AND STAY AWAY FROM WINDOWS

AF

The office that day

Everything else NWS Medford, OR issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 22, 6:56 PM PDTSevere Thunderstorm WarningMFRKlamath59 min

Nearby

Severe Thunderstorm Warnings in Oregon, 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.