Alert archive / Oregon / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 21, NWS Medford, OR

August 5, 2020Klamath County, Oregon

NWS Medford, OR issued this severe thunderstorm warning at Aug 5, 2020, 3:59 PM PDT for Klamath County, Oregon. It was in force for 19 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: Aug 5, 2020, 3:59 PM PDT (22:59 UTC)
Expired: Aug 5, 2020, 4:18 PM PDT
In force: 19 min
Issued by: NWS Medford, OR
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Klamath County, OR

The radar

The Medford radar (KMAX), 85 km from the middle of the area, began a volume at 23:01 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, 11.0 hours before the alert went out and 97 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1118 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 34 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

628 
WUUS56 KMFR 052259
SVRMFR
ORC035-052330-
/O.NEW.KMFR.SV.W.0021.200805T2259Z-200805T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Medford OR
359 PM PDT Wed Aug 5 2020

The National Weather Service in Medford has issued a

* Severe Thunderstorm Warning for...
  South central Klamath County in south central Oregon...

* Until 430 PM PDT.

* At 358 PM PDT, a severe thunderstorm was located near Olene, or 8
  miles southeast of Klamath Falls, moving north at 10 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* Locations impacted include...
  Klamath Falls, Miller Island Klamath Wildlife Area, Midland and
  Altamont.

This includes the following highways...
 US 97 in Oregon between mile markers 275 and 283.
 Klamath-Lakeview Highway 140 in Oregon between mile markers 3 and 8.
 Lake of the Woods Highway 140 in Oregon between mile markers 67 and
68.
 Highway 66 in Oregon between mile markers 56 and 59.
 Highway 39 in Oregon between mile markers 1 and 13.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4206 12155 4201 12166 4201 12177 4219 12187
      4226 12172
TIME...MOT...LOC 2258Z 162DEG 8KT 4212 12168 

HAIL...1.00IN
WIND...<50MPH
 
$$

STOCKTON

1 follow-up statement

470 
WWUS56 KMFR 052318
SVSMFR

Severe Weather Statement
National Weather Service Medford OR
418 PM PDT Wed Aug 5 2020

ORC035-052327-
/O.CAN.KMFR.SV.W.0021.000000T0000Z-200805T2330Z/
Klamath OR-
418 PM PDT Wed Aug 5 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL KLAMATH COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has weakened.
Therefore, the warning has been cancelled.

LAT...LON 4206 12155 4201 12166 4201 12177 4219 12187
      4226 12172
TIME...MOT...LOC 2312Z 162DEG 8KT 4216 12170 

$$

STOCKTON

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 5, 2:39 AM PDT	Gale Watch	MFR		12 hr
Aug 5, 2:39 AM PDT	Small Craft Advisory	MFR		20 hr
Aug 5, 2:39 AM PDT	Small Craft Advisory	MFR		4 days
Aug 5, 2:18 PM PDT	Gale Warning	MFR		4 days
Aug 5, 2:53 PM PDT	Special Weather Statement	MFR		22 min
Aug 5, 3:27 PM PDT	Special Weather Statement	MFR		33 min
Aug 5, 3:32 PM PDT	Special Weather Statement	MFR		28 min
Aug 5, 3:43 PM PDT	Severe Thunderstorm Warning	MFR	Klamath	32 min
Aug 5, 3:50 PM PDT	Special Weather Statement	MFR	Klamath	25 min
Aug 5, 3:54 PM PDT	Special Weather Statement	MFR		36 min
Aug 5, 4:13 PM PDT	Severe Thunderstorm Warning	MFR	Klamath	20 min
Aug 5, 4:42 PM PDT	Severe Thunderstorm Warning	MFR	Klamath	33 min
Aug 5, 4:53 PM PDT	Areal Flood Advisory	MFR	Lake	3 hr

Nearby

Severe Thunderstorm Warnings in Oregon, 2020 Every severe thunderstorm warning in 2020

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.