Alert archive / California / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 2, NWS Medford, OR

July 9, 2001Siskiyou County, California

NWS Medford, OR issued this severe thunderstorm warning at Jul 9, 2001, 6:23 PM PDT for Siskiyou County, California. It was in force for 37 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued
Jul 9, 2001, 6:23 PM PDT (01:23 UTC)
Expired
Jul 9, 2001, 7:00 PM PDT
In force
37 min
Issued by
NWS Medford, OR
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Siskiyou County, CA

The radar

The Medford radar (KMAX), 36 km from the middle of the area, began a volume at 01:24 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, 1.4 hours before the alert went out and 69 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 2001-07-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 614 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Medford/Jackson, OR at 00:00Z on 2001-07-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 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
614 J/kg
Mixed-layer CIN
-28 J/kg
Mixed-layer LCL
3548 m above ground
0-6 km bulk shear
0 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
0 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 
WUUS56 KMFR 100126
SVRMFR

CAC093-100200-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MEDFORD OR
623 PM PDT MON JUL 9 2001

THE NATIONAL WEATHER SERVICE IN MEDFORD HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTH CENTRAL SISKIYOU COUNTY IN NORTHERN CALIFORNIA

* UNTIL 700 PM PDT.

* AT 614 PM PDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER CENTRAL SISKIYOU COUNTY...OR ABOUT 4 MILES
  SOUTHWEST OF YREKA...MOVING NORTH AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
  OVER GUNSIGHT PEAK AT 635 PM PDT 
  NEAR GOTTVILLE ON HIGHWAY 96 AT 650 PM PDT

IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY BUILDING
AWAY FROM WINDOWS. REMEMBER...A SEVERE THUNDERSTORM CAN PRODUCE LARGE
DAMAGING HAIL...DAMAGING WINDS IN EXCESS OF 55 MPH...DEADLY
LIGHTNING...AND VERY HEAVY RAIN.

LAT...LON 4167 12273 4169 12264 4186 12267 4188 12279
$$

WOLF

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 9, 2:30 PM PDT, 3 hours 53 minutes earlier.

Area forecast discussion, Jul 9, 2:30 PM PDT, 3 hours 53 minutes before
SOUTHWEST OREGON/NORTHERN CALIFORNIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MEDFORD OR
230 PM PDT MON JUL 09 2001

12Z ETA/MESOETA/NGM/AVN IN.

THE OVERALL SYNOPTIC PATTERN THIS MORNING IS THE SAME AS IT HAS BEEN
FOR THE PAST SEVERAL DAYS.  A STRONG UPPER HIGH OVER OKLAHOMA WILL
REMAIN NEARLY STATIONARY FOR A FEW MORE DAYS...AND A WEAK UPPER
TROUGH WILL REMAIN OFF THE WEST COAST.  THIS WILL MAKE FOR GENERALLY
SOUTHERLY FLOW OVER SOUTHERN OREGON/NORTHERN CALIFORNIA AND THAT
MEANS AFTERNOON/EVENING THUNDERSTORMS ARE A POSSIBILITY.

THUNDERSTORMS HAVE DEVELOPED THIS AFTERNOON SOUTH AND JUST TO THE
EAST OF THE FORECAST AREA.  PLENTY OF CUMULUS HAVE FORMED OVER ALL OF
THE FORECAST AREA FROM THE CASCADES EAST AND OVER SISKIYOU COUNTY.
THUNDERSTORMS ARE A POSSIBILITY OVER ALL OF THIS AREA LATER THIS
AFTERNOON...SO WILL ADD A CHANCE OF EVENING THUNDERSTORMS IN THOSE
AREAS.  SOME OF THE STORMS THAT FORM OVER THE SISKIYOUS MAY MOVE OUT
OVER JACKSON AND JOSEPHINE COUNTIES...SO WILL ADD A SLIGHT CHANCE
THIS EVENING THERE.

TUESDAY AND WEDNESDAY LOOK GOOD FOR AFTERNOON/EVENING THUNDERSTORM
ACTIVITY BECAUSE THE HEATING WONT HAVE TO DO IT ALONE THEN...THERE
ARE SOME SHORT WAVES EMBEDDED IN THE SOUTHERLY FLOW THAT WILL MOVE
OVER THE FORECAST AREA.

THE OTHER FORECAST PROBLEM IS THE MARINE LAYER.  AS EXPECTED...THE
STRATUS HAS FILLED IN ALONG THE COAST.  EXPECT THE COAST TO SEE LOW
CLOUDS AND FOG EACH NIGHT WITH AFTERNOON CLEARING.  INLAND
PENETRATION WILL BE LIMITED TO THE COQUILLE AND WESTERN UMPQUA
VALLEYS TONIGHT...BUT THE SHORT WAVE ACTIVITY DURING THE NEXT FEW
DAYS WILL ALLOW THE LAYER TO THICKEN A BIT...SO EXPECT A GRADUAL
INCREASE IN OVERNIGHT COVERAGE IN THE UMPQUA VALLEY.

EXTENDED...THE STRONG HIGH OVER OKLAHOMA WILL RETROGRADE TO THE NEW
MEXICO AREA BY THURSDAY AND THE TROUGH OFFSHORE WILL WEAKEN A BIT IN
RESPONSE TO THE RIDGING.  THIS WILL SHIFT THE FLOW ALOFT FROM SOUTH
TO SOUTHWEST AND SHUNT THE THUNDERSTORMS OFF TO THE EAST.  SO...THE
ENTIRE EXTENDED PERIOD (THURSDAY THROUGH MONDAY) WILL BE DRY.  EXPECT
THE MARINE LAYER DEPTH TO INCREASE A BIT WITH STRONGER ONSHORE
FLOW...SO OVERNIGHT LOW CLOUDS AND FOG WILL CONTINUE TO SPREAD IN THE
UMPQUA AND POSSIBLY THE ROGUE VALLEYS.  MOSTLY CLEAR SKIES ELSEWHERE.

.MFR...NONE.

OTH BB 052/065 053/065 053 150111
4BK BB 051/065 052/065 052 150111
RBG BB 057/089 057/084 054 151333
MFR BB 060/094 060/090 057 152444
LMT BB 051/087 051/084 049 153555
LKV BB 051/087 051/084 049 153555
MHS BB 053/089 053/085 051 153444

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 9, 5:42 PM PDTSevere Thunderstorm WarningMFRSiskiyou33 min
Jul 9, 7:17 PM PDTSevere Thunderstorm WarningMFRSiskiyou28 min
Jul 9, 7:24 PM PDTSevere Thunderstorm WarningMFRSiskiyou51 min
Jul 10, 3:56 PM PDTSevere Thunderstorm WarningMFRSiskiyou34 min

Nearby

Severe Thunderstorm Warnings in California, 2001Every severe thunderstorm warning in 2001

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.