Alert archive / California / Special Weather Statements in 2015

Special Weather Statement, NWS Medford, OR

July 20, 2015Siskiyou County, California

NWS Medford, OR issued this special weather statement at Jul 20, 2015, 8:29 PM PDT for Siskiyou County, California. It was in force for 31 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 20, 2015, 8:29 PM PDT (03:29 UTC)
Expired: Jul 20, 2015, 9:00 PM PDT
In force: 31 min
Issued by: NWS Medford, OR

County Siskiyou County, CA

The radar

The Medford radar (KMAX), 46 km from the middle of the area, began a volume at 03:33 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, 3.5 hours before the alert went out and 78 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: 13 J/kg
Mixed-layer CIN: -129 J/kg
Mixed-layer LCL: 3153 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: -16 m²/s²
0-3 km storm-relative helicity: 23 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.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 20, 7:57 PM PDT, 32 minutes earlier.

Area forecast discussion, Jul 20, 7:57 PM PDT, 32 minutes before

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In the hours before

Special weather statement, Jul 20, 7:10 PM PDT, 1 hour 19 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MEDFORD OR
710 PM PDT MON JUL 20 2015

CAZ085-210300-
MODOC COUNTY-
710 PM PDT MON JUL 20 2015

...A STRONG THUNDERSTORM WILL AFFECT SOUTHWESTERN MODOC COUNTY...

AT 705 PM PDT...A STRONG THUNDERSTORM WAS OVER DAY...OR 12 MILES
NORTHWEST OF NUBIEBER...MOVING SOUTHEAST AT 5 MPH.

LOCATIONS IMPACTED INCLUDE...
DAY.

RADAR RAINFALL ESTIMATES OF ONE QUARTER TO ONE HALF INCH PER HOUR
ARE BEING INDICATED WITH THIS STORM. THIS COULD CAUSE SOME MINOR
FLOODING IN THE VICINITY OF THE DAY FIRE...ESPECIALLY DOWN DRAINAGE.
DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY CAN RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
OFFICE IN MEDFORD.

LAT...LON 4133 12138 4129 12121 4119 12116 4118 12143
TIME...MOT...LOC 0205Z 325DEG 5KT 4124 12134

BTL

Special weather statement, Jul 20, 7:15 PM PDT, 1 hour 14 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MEDFORD OR
715 PM PDT MON JUL 20 2015

CAZ081-083-210245-
NORTH CENTRAL AND SOUTHEAST SISKIYOU COUNTY-CENTRAL SISKIYOU COUNTY-
715 PM PDT MON JUL 20 2015

...A STRONG THUNDERSTORM WILL AFFECT CENTRAL SISKIYOU COUNTY...

AT 714 PM PDT...A STRONG THUNDERSTORM WAS NEAR GRENADA...OR NEAR
YREKA...MOVING EAST AT 5 MPH. A TRAINED SPOTTER REPORTED NICKEL
SIZED HAIL WITH THIS STORM.

WIND GUSTS UP TO 50 MPH AND NICKEL SIZE HAIL ARE POSSIBLE WITH THIS
STORM.

LOCATIONS IMPACTED INCLUDE...
MONTAGUE AND GRENADA.

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 4159 12259 4168 12265 4178 12232 4162 12231
TIME...MOT...LOC 0214Z 274DEG 6KT 4166 12258

BTL

Special weather statement, Jul 20, 8:29 PM PDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 7:10 PM PDT	Special Weather Statement	MFR		50 min
Jul 21, 3:01 AM PDT	Hazardous Seas Warning	MFR		12 hr
Jul 21, 4:07 AM PDT	Red Flag Warning	MFR	Harney, Klamath, Lake	21 hr
Jul 21, 1:27 PM PDT	Special Weather Statement	MFR		33 min
Jul 21, 2:57 PM PDT	Gale Warning	MFR		8 hr
Jul 21, 2:57 PM PDT	Hazardous Seas Warning	MFR		8 hr
Jul 21, 2:57 PM PDT	Small Craft Advisory for Winds	MFR		34 hr
Jul 21, 2:57 PM PDT	Small Craft Advisory for Hazardous Seas	MFR		34 hr
Jul 21, 3:42 PM PDT	Special Weather Statement	MFR		33 min
Jul 21, 4:46 PM PDT	Special Weather Statement	MFR		29 min
Jul 20, 7:11 PM PDT	Red Flag Warning	MFR	Siskiyou	3 hr
Jul 20, 7:15 PM PDT	Special Weather Statement	MFR	Siskiyou	30 min
Jul 20, 7:29 PM PDT	Severe Thunderstorm Warning	MFR	Siskiyou	31 min
Jul 20, 7:56 PM PDT	Areal Flood Advisory	MFR	Siskiyou	3 hr
Jul 20, 8:09 PM PDT	Flash Flood Warning	MFR	Siskiyou	3 hr
Jul 21, 1:09 PM PDT	Special Weather Statement	MFR	Modoc	36 min
Jul 21, 1:55 PM PDT	Special Weather Statement	MFR	Modoc	35 min
Jul 21, 2:08 PM PDT	Severe Thunderstorm Warning	MFR	Modoc	22 min
Jul 21, 2:33 PM PDT	Special Weather Statement	MFR	Modoc	27 min
Jul 21, 2:44 PM PDT	Special Weather Statement	MFR	Modoc	31 min
Jul 21, 4:37 PM PDT	Special Weather Statement	MFR	Siskiyou	23 min

Nearby

Special Weather Statements in California, 2015 Every special weather statement 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.