Alert archive / Oregon / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 12, NWS Medford, OR

July 27, 1997Klamath County, Oregon

NWS Medford, OR issued this severe thunderstorm warning at Jul 27, 1997, 9:25 PM PDT for Klamath County, Oregon. It was in force for 55 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 27, 1997, 9:25 PM PDT (04:25 UTC)
Expired: Jul 27, 1997, 10:20 PM PDT
In force: 55 min
Issued by: NWS Medford, OR
Area: Whole counties

County Klamath County, OR

The radar

The Medford radar (KMAX), 110 km from the middle of the area, began a volume at 04:26 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

Medford/Jackson, OR (KMFR), launched 00:00Z, 4.4 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: 759 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 2402 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: 49 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.

868 
WUUS1 KMFR 280427 RRA
SVRMFR
ORC035-280520-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MEDFORD OR
925 PM PDT SUN JUL 27 1997

THE NATIONAL WEATHER SERVICE IN MEDFORD OR HAS ISSUED A SEVERE
THUNDERSTORM WARNING EFFECTIVE UNTIL 1020 PM PDT FOR PEOPLE IN THE
FOLLOWING LOCATIONS...

IN SOUTH CENTRAL OREGON

  ...WEST CENTRAL KLAMATH COUNTY

AT 925 PM...RADAR INDICATED A SEVERE THUNDERSTORM ON HIGHWAY 62 NEAR
THE TOWN OF FORT KLAMATH. THIS STORM WILL MOVE NORTH-NORTHWEST AT 10
MPH.

THIS STORM WILL LIKELY PRODUCE HAIL UP TO 1 INCH IN DIAMETER.

BE ALERT FOR LOCAL FLOODING CAUSED BY THUNDERSTORM RAINS.

FOSTER

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 Medford, OR wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 27, 8:30 PM PDT, 55 minutes earlier.

Area forecast discussion, Jul 27, 8:30 PM PDT, 55 minutes before

SOUTHWEST OREGON/NORTHEAST CALIFORNIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MEDFORD OR
830 PM PDT SUN JUL 27 1997

CONVECTN KEEPG THINGS INTERESTG HERE IN SRN OREGON AND NRN CA. MOST
IMPRESSV DVLPMNT HAS BEEN ALG CREST OF CNTL CASCDS...ALTHO E OF
CASCDS AND NRN CA GENERAL CONVCTN CONTINUES. WL NOT DECIDE TO CHNG
FCSTS MUCH FOR NOW WITHOUT GOOD LOOK AT NEW MDLS. NEW ETA DOES CONT
TREND OF MORE AVLBL MSTR AND MORE INSTABILITY ON MON THAN TDY. FLOW
STILL LOOKS TO BE SLY BY 00Z. WL NOT MENTN CHC OF TSRA W OF CASCDS
TUE AS FLOW TURNS MORE SWLY. VERY WEAK THRML TROF CONTS TO REMAIN OFF
THE NRN CA CST...BUT NOT ENUF OFFSHR COMPONENT TO WND TO KEEP CSTL ST
OUT. CRAWFORD

.MFR...NONE

.KMAX...VCP 11...OPERATING.

...SEE PDXCCFPDX FOR CODED CITIES FORECAST

MFR BU 058/093 057/090 057 170120
LMT TB 053/085 051/083 050 172343
RBG UU 057/086 057/082 056 170-10
4BK BB 051/068 052/068 052 170000
OTH BB 053/069 054/069 054 170000
YKA TU 054/095 053/091 052 172343
MHS TU 053/086 052/083 051 172343
S11 TU 048/088 047/086 045 172343

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 27, 6:20 PM PDT	Severe Thunderstorm Warning	MFR	Klamath	60 min
Jul 28, 4:31 PM PDT	Severe Thunderstorm Warning	MFR	Klamath	59 min
Jul 28, 4:46 PM PDT	Severe Thunderstorm Warning	MFR	Klamath	44 min

Nearby

Severe Thunderstorm Warnings in Oregon, 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.