Alert archive / California / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 20, NWS Medford, OR

July 7, 2015Siskiyou County, California

NWS Medford, OR issued this severe thunderstorm warning at Jul 7, 2015, 2:10 PM PDT for Siskiyou County, California. It was in force for 35 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 7, 2015, 2:10 PM PDT (21:10 UTC)
Expired: Jul 7, 2015, 2:45 PM PDT
In force: 35 min
Issued by: NWS Medford, OR
Area: Storm-based polygon

County Siskiyou County, CA

The radar

The Medford radar (KMAX), 56 km from the middle of the area, began a volume at 21:14 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 12:00Z, 9.2 hours before the alert went out and 89 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: 4 J/kg
Mixed-layer CIN: -552 J/kg
Mixed-layer LCL: 1433 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: -15 m²/s²
0-3 km storm-relative helicity: 127 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 7, 12:44 PM PDT, 1 hour 26 minutes earlier.

Area forecast discussion, Jul 7, 12:44 PM PDT, 1 hour 26 minutes before

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In the hours before

Special weather statement, Jul 7, 1:05 PM PDT, 1 hour 5 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MEDFORD OR
105 PM PDT TUE JUL 7 2015

ORZ027-030-072030-
NORTHERN AND EASTERN KLAMATH COUNTY AND WESTERN LAKE COUNTY-SOUTH
CENTRAL OREGON CASCADES-
105 PM PDT TUE JUL 7 2015

...A STRONG THUNDERSTORM WILL AFFECT EASTERN DOUGLAS AND NORTHWESTERN
KLAMATH COUNTIES...

AT 102 PM PDT...A STRONG THUNDERSTORM WAS OVER HIGHWAY 138 DIAMOND
LAKE SUMMIT...OR 15 MILES NORTH OF CRATER LAKE...MOVING NORTHEAST AT
10 MPH.

WINDS IN EXCESS OF 30 MPH AND HALF INCH HAIL ARE POSSIBLE WITH THIS
STORM.

LOCATIONS IMPACTED INCLUDE...
CRATER LAKE...BROKEN ARROW CAMPGROUND...CRATER LAKE NATIONAL PARK...
DIGIT POINT CAMPGROUND AT MILLER LAKE...EAST LEMOLO CAMPGROUND...
DIAMOND LAKE...HIGHWAY 138 DIAMOND LAKE SUMMIT...THIELSEN VIEW
CAMPGROUND AND CRATER LAKE LODGE.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

LOCALLY HEAVY RAINFALL OF 1 INCH PER HOUR IS POSSIBLE WITH THESE
STORMS.

THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

LAT...LON 4283 12206 4297 12226 4332 12220 4330 12189
TIME...MOT...LOC 2002Z 204DEG 8KT 4312 12209

SCHAAF

Special weather statement, Jul 7, 1:48 PM PDT, 22 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MEDFORD OR
148 PM PDT TUE JUL 7 2015

ORZ030-072115-
NORTHERN AND EASTERN KLAMATH COUNTY AND WESTERN LAKE COUNTY-
148 PM PDT TUE JUL 7 2015

...A STRONG THUNDERSTORM WILL AFFECT NORTH CENTRAL KLAMATH COUNTY...

AT 147 PM PDT...TWO STRONG THUNDERSTORMS WERE CEHMULT AND WALT
HARING SNOW PARK...OR 31 MILES NORTHEAST OF CRATER LAKE. THE STORM
WAS NEARLY STATIONARY.

WINDS IN EXCESS OF 30 MPH AND HALF INCH HAIL ARE POSSIBLE WITH THIS
STORM.

LOCATIONS IMPACTED INCLUDE...
WALT HARING SNOW PARK AND CHEMULT.

TORRENTIAL RAINFALL OF UP TO AN INCH AN HOUR IS ALSO OCCURRING WITH
THIS STORM...AND MAY CAUSE LOCALIZED FLOODING. DO NOT DRIVE YOUR
VEHICLE THROUGH FLOODED ROADWAYS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

LAT...LON 4317 12147 4321 12183 4337 12177 4330 12141
TIME...MOT...LOC 2047Z 207DEG 2KT 4324 12173

SCHAAF

Special weather statement, Jul 7, 1:57 PM PDT, 13 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MEDFORD OR
157 PM PDT TUE JUL 7 2015

ORZ027>030-072130-
KLAMATH BASIN-SISKIYOU MOUNTAINS AND SOUTHERN OREGON
CASCADES-NORTHERN AND EASTERN KLAMATH COUNTY AND WESTERN LAKE
COUNTY-SOUTH CENTRAL OREGON CASCADES-
157 PM PDT TUE JUL 7 2015

...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN KLAMATH COUNTY...

AT 155 PM PDT...A STRONG THUNDERSTORM WAS NEAR CRATER LAKE...MOVING
SOUTHEAST AT 5 MPH.

WINDS IN EXCESS OF 40 MPH AND NICKEL SIZE HAIL ARE POSSIBLE WITH THIS
STORM.

LOCATIONS IMPACTED INCLUDE...
CRATER LAKE...HIGHWAY 62 NEAR CRATER LAKE...ANNIE CREEK SNOW PARK...
CRATER LAKE NATIONAL PARK AND CRATER LAKE LODGE.

FREQUENT CLOUD TO GROUND LIGHTNING MAY OCCUR WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

LAT...LON 4290 12222 4304 12201 4289 12184 4274 12204
TIME...MOT...LOC 2055Z 318DEG 7KT 4290 12200

MSC

Special weather statement, Jul 7, 2:01 PM PDT, 9 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MEDFORD OR
201 PM PDT TUE JUL 7 2015

CAZ081-083-084-072145-
NORTH CENTRAL AND SOUTHEAST SISKIYOU COUNTY CA-
CENTRAL SISKIYOU COUNTY CA-
NORTHEAST SISKIYOU AND NORTHWEST MODOC COUNTIES CA-
201 PM PDT TUE JUL 7 2015

...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL SISKIYOU COUNTY
UNTIL 245 PM PDT...

AT 159 PM PDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
JUANITA LAKE CAMPGROUND...OR 22 MILES EAST OF YREKA...MOVING
NORTHWEST AT 15 MPH.

NICKEL SIZE HAIL AND WINDS IN EXCESS OF 30 MPH WILL BE POSSIBLE WITH
THIS STORM. THE STORM IS CONTINUING TO REDEVELOP ON THE EAST SIDE OF
US 97 SO WILL AFFECT THE HIGHWAY FOR THE NEXT 30 MINUTES.

LOCATIONS IMPACTED INCLUDE...
JUANITA LAKE CAMPGROUND AND HIGHWAY 97 GRASS LAKE AND MOUNT HEBRON.

LAT...LON 4174 12199 4160 12198 4159 12215 4177 12238
      4190 12219
TIME...MOT...LOC 2059Z 135DEG 14KT 4175 12219

JBL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 5:25 PM PDT	Special Weather Statement	MFR	Josephine	50 min
Jul 6, 6:22 PM PDT	Special Weather Statement	MFR	Deschutes	23 min
Jul 7, 1:05 PM PDT	Special Weather Statement	MFR		25 min
Jul 7, 1:48 PM PDT	Special Weather Statement	MFR		27 min
Jul 7, 1:57 PM PDT	Special Weather Statement	MFR	Klamath	33 min
Jul 7, 2:38 PM PDT	Special Weather Statement	MFR		22 min
Jul 7, 2:47 PM PDT	Severe Thunderstorm Warning	MFR	Jackson, Klamath	28 min
Jul 7, 3:06 PM PDT	Severe Thunderstorm Warning	MFR	Klamath	24 min
Jul 7, 2:01 PM PDT	Special Weather Statement	MFR	Siskiyou	44 min
Jul 7, 4:36 PM PDT	Special Weather Statement	MFR	Siskiyou	24 min
Jul 7, 4:47 PM PDT	Severe Thunderstorm Warning	MFR	Siskiyou	28 min

Nearby

Severe Thunderstorm Warnings in California, 2015 Every severe thunderstorm warning in 2015

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.