Alert archive / Colorado / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 13, NWS Denver/Boulder, CO

May 7, 2016Washington County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at May 7, 2016, 5:17 PM MDT for Washington County, Colorado. It was in force for 28 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 7, 2016, 5:17 PM MDT (23:17 UTC)
Expired
May 7, 2016, 5:45 PM MDT
In force
28 min
Issued by
NWS Denver/Boulder, CO
Area
Storm-based polygon
Hail
1.25 in
Wind
60.0 mph

County Washington County, CO

The radar

The Denver radar (KFTG), 99 km from the middle of the area, began a volume at 23:19 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
May 7, 12:31 PM MDTTornado WatchSPC8 hr

The nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 11.3 hours before the alert went out and 18 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, Denver, CO at 12:00Z on 2016-05-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 5 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 12:00Z on 2016-05-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -38 square meters per square second.19395878Sfc1 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
5 J/kg
Mixed-layer CIN
-219 J/kg
Mixed-layer LCL
776 m above ground
0-6 km bulk shear
64 kt
0-1 km storm-relative helicity
-38 m²/s²
0-3 km storm-relative helicity
163 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The text

As transmitted.

617 
WUUS55 KBOU 072317
SVRBOU
COC121-072345-
/O.NEW.KBOU.SV.W.0013.160507T2317Z-160507T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
517 PM MDT SAT MAY 7 2016

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL WASHINGTON COUNTY IN NORTHEASTERN COLORADO...

* UNTIL 545 PM MDT

* AT 517 PM MDT...A SEVERE THUNDERSTORM WAS LOCATED 9 MILES NORTHEAST
  OF WOODLIN SCHOOL...OR 21 MILES SOUTHWEST OF AKRON...MOVING
  NORTHEAST AT 30 MPH.

  HAZARD...60 MPH WIND GUSTS AND HALF DOLLAR SIZE HAIL. 

  SOURCE...RADAR INDICATED. 

  IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE 
           TO ROOFS...SIDING AND TREES. 

* LOCATIONS IMPACTED INCLUDE...
  AKRON...ELBA AND LINDON. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

LARGE HAIL AND DAMAGING WINDS AND CONTINUOUS CLOUD TO GROUND
LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY.
LIGHTNING IS ONE OF NATURES LEADING KILLERS. REMEMBER...IF YOU CAN
HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.

&&

A TORNADO WATCH REMAINS IN EFFECT UNTIL 700 PM MDT FOR NORTHEASTERN
COLORADO.

LAT...LON 3971 10338 3995 10361 4000 10355 4000 10347
      4008 10347 4023 10331 4001 10305
TIME...MOT...LOC 2317Z 220DEG 26KT 3990 10343 

HAIL...1.25IN
WIND...60MPH

$$

RPK
1 follow-up statement
843 
WWUS55 KBOU 072345
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
545 PM MDT SAT MAY 7 2016

COC121-072355-
/O.EXP.KBOU.SV.W.0013.000000T0000Z-160507T2345Z/
WASHINGTON CO-
545 PM MDT SAT MAY 7 2016

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL WASHINGTON COUNTY HAS
EXPIRED...
                
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
THEREFORE THE WARNING HAS BEEN ALLOWED TO EXPIRE.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 700 PM MDT FOR NORTHEASTERN
COLORADO.

LAT...LON 3971 10338 3995 10361 4000 10355 4000 10347
      4008 10347 4023 10331 4001 10305
TIME...MOT...LOC 2345Z 220DEG 26KT 3990 10343 

$$

RPK

The office that day

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

IssuedProductOfficeCountiesLasted
May 6, 6:40 PM MDTSpecial Weather StatementBOUClear Creek50 min
May 7, 11:36 AM MDTSpecial Weather StatementBOUJackson24 min
May 7, 12:41 PM MDTSpecial Weather StatementBOUDouglas34 min
May 7, 12:55 PM MDTTornado WarningBOUElbert22 min
May 7, 1:14 PM MDTSevere Thunderstorm WarningBOUArapahoe, Elbert31 min
May 7, 1:29 PM MDTTornado WarningBOUArapahoe, Elbert16 min
May 7, 1:43 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe32 min
May 7, 2:08 PM MDTSevere Thunderstorm WarningBOUArapahoe, Elbert52 min
May 7, 2:10 PM MDTSevere Thunderstorm WarningBOUWeld35 min
May 7, 2:14 PM MDTSevere Thunderstorm WarningBOUMorgan, Weld31 min
May 7, 2:17 PM MDTSevere Thunderstorm WarningBOUAdams28 min
May 7, 2:31 PM MDTSevere Thunderstorm WarningBOUMorgan, Weld29 min
May 7, 2:35 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe40 min
May 7, 2:46 PM MDTTornado WarningBOUMorgan, Weld29 min
May 7, 3:03 PM MDTSevere Thunderstorm WarningBOUWashington27 min
May 7, 3:12 PM MDTTornado WarningBOUMorgan, Weld33 min
May 7, 3:34 PM MDTTornado WarningBOUMorgan26 min
May 7, 3:36 PM MDTTornado Warning Tornado observedBOUWeld24 min
May 7, 3:54 PM MDTTornado WarningBOUWeld36 min
May 7, 3:58 PM MDTSevere Thunderstorm WarningBOUAdams, Morgan32 min
May 7, 4:39 PM MDTSevere Thunderstorm WarningBOUAdams, Morgan, Washington36 min
May 7, 4:47 PM MDTAreal Flood AdvisoryBOUAdams, Morgan, Washington3 hr
May 7, 5:44 PM MDTSevere Thunderstorm WarningBOUPhillips31 min
May 7, 5:54 PM MDTSevere Thunderstorm WarningBOUWashington36 min

Nearby

Severe Thunderstorm Warnings in Colorado, 2016Every severe thunderstorm warning in 2016

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.