Alert archive / Oregon / Tornado Warnings in 2017

Tornado Warning 1, NWS Medford, OR

May 4, 2017Jackson County, Klamath County, Oregon

NWS Medford, OR issued this tornado warning at May 4, 2017, 7:31 PM PDT for Jackson County, Klamath County, Oregon. It was in force for 14 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: May 4, 2017, 7:31 PM PDT (02:31 UTC)
Expired: May 4, 2017, 7:45 PM PDT
In force: 14 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), 83 km from the middle of the area, began a volume at 02:35 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, 2.5 hours before the alert went out and 58 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.

998 
WFUS56 KMFR 050231
TORMFR
ORC029-035-050245-
/O.NEW.KMFR.TO.W.0001.170505T0231Z-170505T0245Z/

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

The National Weather Service in Medford has issued a

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

* Until 745 PM PDT
    
* At 731 PM PDT, a severe thunderstorm capable of producing a tornado
  was located near Prospect, or 17 miles southwest of Crater Lake,
  moving north at 55 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...
  Natural Bridge Campground around 740 PM PDT. 
  Thousand Springs Sno-Park, Rogue Gorge and Union Creek around 745 
  PM PDT. 

* This includes the following highways...
   Highway 230 in Oregon near mile marker 1.
   Highway 62 in Oregon between mile markers 44 and 69.

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
commaOrEllipsis()in a mobile home, or in a vehicle, move to the
closest substantial shelter and protect yourself from flying debris.

&&

LAT...LON 4264 12232 4270 12251 4292 12248 4300 12217
TIME...MOT...LOC 0231Z 201DEG 47KT 4274 12241 

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

$$

MAS

1 follow-up statement

120 
WWUS56 KMFR 050243
SVSMFR

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

ORC029-035-050251-
/O.EXP.KMFR.TO.W.0001.000000T0000Z-170505T0245Z/
Jackson OR-Klamath OR-
743 PM PDT THU MAY 4 2017

...THE TORNADO WARNING FOR NORTHEASTERN JACKSON AND WEST CENTRAL
KLAMATH COUNTIES WILL EXPIRE AT 745 PM PDT...
        
The storm which prompted the warning has moved out of the area.
Therefore the warning will be allowed to expire.  However small hail
and gusty winds are still possible with this thunderstorm.

Remember, a Severe Thunderstorm and Tornado Warning still remains in 
effect for portions of Jackson and Klamath County until 815 pm PDT.

LAT...LON 4264 12232 4270 12251 4292 12248 4300 12217
TIME...MOT...LOC 0241Z 201DEG 47KT 4286 12235 

$$

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, 7:40 PM PDT	Tornado Warning	MFR	Jackson, Klamath	15 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.