Alert archive / Colorado / Tornado Warnings in 2017

Tornado Warning 7, NWS Denver/Boulder, CO

June 7, 2017Washington County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jun 7, 2017, 6:29 PM MDT for Washington County, Colorado. It was in force for 46 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: Jun 7, 2017, 6:29 PM MDT (00:29 UTC)
Expired: Jun 7, 2017, 7:15 PM MDT
In force: 46 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Tornado: Observed
Hail: 2.0 in

County Washington County, CO

The radar

The Denver radar (KFTG), 105 km from the middle of the area, began a volume at 00:33 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

Denver, CO (KDEN), launched 00:00Z, 0.5 hours before the alert went out and 11 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: 496 J/kg
Mixed-layer CIN: -86 J/kg
Mixed-layer LCL: 1990 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 106 m²/s²
0-3 km storm-relative helicity: 138 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

As transmitted.

049 
WFUS55 KBOU 080029
TORBOU
COC121-080115-
/O.NEW.KBOU.TO.W.0007.170608T0029Z-170608T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Denver CO
629 PM MDT WED JUN 7 2017

The National Weather Service in Denver Colorado has issued a

* Tornado Warning for...
  Central Washington County in northeastern Colorado...

* Until 715 PM MDT

* At 628 PM MDT, a confirmed tornado was located 10 miles west of
  Elba, or 16 miles southwest of Akron, moving southeast at 10 mph.

  HAZARD...Damaging tornado and hail up to two inches in diameter. 

  SOURCE...Weather spotters confirmed tornado. 

  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. 

* Locations impacted include...
  Elba.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement 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 3996 10347 4005 10334 3990 10305 3979 10332
TIME...MOT...LOC 0028Z 311DEG 10KT 3995 10337 

TORNADO...OBSERVED
HAIL...2.00IN

$$

GIMMESTAD

2 follow-up statements

047 
WWUS55 KBOU 080044
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
644 PM MDT WED JUN 7 2017

COC121-080115-
/O.CON.KBOU.TO.W.0007.000000T0000Z-170608T0115Z/
Washington CO-
644 PM MDT WED JUN 7 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 715 PM MDT FOR CENTRAL
WASHINGTON COUNTY...
    
At 643 PM MDT, a confirmed tornado was located 8 miles west of Elba,
or 18 miles south of Akron, moving southeast at 5 mph.

HAZARD...Damaging tornado and two inch hail. 

SOURCE...Weather spotters confirmed tornado. 

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. 

Locations impacted include...
Elba.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement 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.

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

&&

LAT...LON 3992 10344 3997 10339 4001 10333 3989 10307
      3979 10332
TIME...MOT...LOC 0043Z 308DEG 6KT 3991 10334 

TORNADO...OBSERVED
HAIL...2.00IN

$$

GIMMESTAD

322 
WWUS55 KBOU 080058
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
658 PM MDT WED JUN 7 2017

COC121-080115-
/O.CON.KBOU.TO.W.0007.000000T0000Z-170608T0115Z/
Washington CO-
658 PM MDT WED JUN 7 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 715 PM MDT FOR CENTRAL
WASHINGTON COUNTY...
    
At 658 PM MDT, a confirmed tornado was located 6 miles southwest of
Elba, or 20 miles south of Akron, moving southeast at 10 mph.

HAZARD...Damaging tornado and two inch hail. 

SOURCE...Weather spotters confirmed tornado. 

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 tornadic thunderstorm will remain over mainly rural areas of
central Washington County between Elba and Anton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement 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 3990 10342 3995 10331 3989 10307 3979 10332
TIME...MOT...LOC 0058Z 307DEG 8KT 3988 10329 

TORNADO...OBSERVED
HAIL...2.00IN

$$

GIMMESTAD

The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 7, 7:13 PM MDT	Tornado Warning	BOU	Washington	47 min
Jun 7, 7:45 PM MDT	Areal Flood Advisory	BOU	Washington	2 hr
Jun 7, 8:04 PM MDT	Special Weather Statement	BOU	Washington	41 min
Jun 8, 4:35 PM MDT	River Flood Advisory	BOU	Larimer	5 days

Nearby

Tornado Warnings in Colorado, 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.