Alert archive / Oregon / Tornado Warnings in 2017

Tornado Warning 2, NWS Medford, OR

May 4, 2017Jackson County, Klamath County, Oregon

NWS Medford, OR issued this tornado warning at May 4, 2017, 7:40 PM PDT for Jackson County, Klamath County, Oregon. It was in force for 15 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 4, 2017, 7:40 PM PDT (02:40 UTC)
Expired: May 4, 2017, 7:55 PM PDT
In force: 15 min
Issued by: NWS Medford, OR
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.75 in

Counties Jackson County, OR, Klamath County, OR

The radar

The Medford radar (KMAX), 88 km from the middle of the area, began a volume at 02:40 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.

What was reported inside it

Time	Report	Where	Remark
May 4, 8:00 PM PDT	TSTM WND DMG	7 Ene Prospect, OR	MULTIPLE TREES DOWN AND NUMEROUS LIMBS. TIME ESTIMATED FROM RADAR.
May 4, 8:00 PM PDT	HAIL 1	7 Ene Prospect, OR	HAIL MEASURED FROM RESIDUAL PILES ALONG ROAD ROUGHLY 20 HOURS AFTER EVENT. TIME ESTIMATED FROM RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Medford/Jackson, OR (KMFR), launched 00:00Z, 2.7 hours before the alert went out and 65 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: 803 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 2455 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 113 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.0

Open this sounding in Storm Lab

The text

As transmitted.

370 
WFUS56 KMFR 050240
TORMFR
ORC029-035-050315-
/O.NEW.KMFR.TO.W.0002.170505T0240Z-170505T0315Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Medford OR
740 PM PDT THU MAY 4 2017

The National Weather Service in Medford has issued a

* Tornado Warning for...
  Eastern Jackson County in southwestern Oregon...
  West central Klamath County in south central Oregon...

* Until 815 PM PDT
    
* At 739 PM PDT, a severe thunderstorm capable of producing a tornado
  was located 9 miles south of Thousand Springs Sno-Park, or 12 miles
  southwest of Crater Lake, moving northeast at 35 mph.

  HAZARD...Tornado and golf ball size hail. 

  SOURCE...Radar indicated rotation. 

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely. 

* This dangerous storm will be near...
  Highway 62 Near Crater Lake around 755 PM PDT. 
  Crater Lake, Crater Lake National Park and Crater Lake Lodge 
  around 800 PM PDT. 

* This includes...
   Highway 62 in Oregon between mile markers 66 and 81.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement YO or an interior room on the 
lowest floor of a sturdy building. Avoid windows. If you are 
outdoors, in a mobile home, or in a vehicle, move to the closest 
substantial shelter and protect yourself from flying debris.

&&

LAT...LON 4269 12232 4276 12248 4294 12222 4287 12191
TIME...MOT...LOC 0239Z 235DEG 33KT 4278 12231 

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$

MAS

1 follow-up statement

875 
WWUS56 KMFR 050255
SVSMFR

Severe Weather Statement
National Weather Service Medford OR
755 PM PDT THU MAY 4 2017

ORC029-035-050304-
/O.CAN.KMFR.TO.W.0002.000000T0000Z-170505T0315Z/
Jackson OR-Klamath OR-
755 PM PDT THU MAY 4 2017

...THE TORNADO WARNING FOR EASTERN JACKSON AND WEST CENTRAL KLAMATH
COUNTIES IS CANCELLED...
    
The tornado threat has diminished and the Tornado Warning has been 
cancelled. However, large hail, heavy rain and damaging winds remain 
likely and a Severe Thunderstorm Warning remains in effect for the 
area. 

LAT...LON 4269 12232 4276 12248 4294 12222 4287 12191
TIME...MOT...LOC 0253Z 235DEG 33KT 4286 12215 

$$

MAS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 4, 5:51 PM PDT	Special Weather Statement	MFR	Jackson	24 min
May 4, 6:04 PM PDT	Special Weather Statement	MFR	Jackson	26 min
May 4, 6:15 PM PDT	Severe Thunderstorm Warning	MFR	Douglas, Jackson	45 min
May 4, 6:25 PM PDT	Special Weather Statement	MFR	Jackson	35 min
May 4, 6:44 PM PDT	Special Weather Statement	MFR	Jackson	46 min
May 4, 6:51 PM PDT	Severe Thunderstorm Warning	MFR	Douglas, Jackson	24 min
May 4, 7:17 PM PDT	Special Weather Statement	MFR	Jackson	28 min
May 4, 7:23 PM PDT	Special Weather Statement	MFR		22 min
May 4, 7:23 PM PDT	Severe Thunderstorm Warning	MFR	Jackson	37 min
May 4, 7:31 PM PDT	Tornado Warning	MFR	Jackson, Klamath	14 min
May 4, 7:54 PM PDT	Severe Thunderstorm Warning	MFR	Douglas, Jackson, Klamath	36 min
May 4, 8:13 PM PDT	Severe Thunderstorm Warning	MFR	Douglas, Klamath	17 min
May 4, 8:38 PM PDT	Special Weather Statement	MFR		22 min
May 4, 9:17 PM PDT	Special Weather Statement	MFR	Jackson	28 min
May 4, 9:33 PM PDT	Severe Thunderstorm Warning	MFR	Jackson, Klamath	27 min
May 4, 10:18 PM PDT	Special Weather Statement	MFR	Klamath	27 min
May 4, 10:36 PM PDT	Severe Thunderstorm Warning	MFR	Jackson, Klamath	24 min
May 5, 12:13 AM PDT	Special Weather Statement	MFR		32 min
May 5, 2:37 PM PDT	Hazardous Seas Warning	MFR		68 hr

Nearby

Tornado Warnings in Oregon, 2017 Every tornado warning in 2017 Tornadoes in 2017

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.