Tornado Watch 464

Issued

Aug 3, 2013, 2:35 PM MDT (20:35 UTC)

Expired

Aug 3, 2013, 8:43 PM MDT

In force

6 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

55 kt

Counties Adams County, CO, Arapahoe County, CO, Boulder County, CO, Broomfield County, CO, Cheyenne County, CO, Denver County, CO, Douglas County, CO, Elbert County, CO, Jefferson County, CO, Kit Carson County, CO, Larimer County, CO, Lincoln County, CO, Logan County, CO, Morgan County, CO, Washington County, CO, Weld County, CO, Yuma County, CO

The Denver radar (KFTG), 39 km from the middle of the area, began a volume at 20:38 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.

Two or more tornadoes

20%

One or more EF2 to EF5 tornadoes

10%

Ten or more severe wind reports

30%

One or more gusts of 65 knots or more

10%

Ten or more severe hail reports

30%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 1613Aug 3, 1:50 PM MDT
• Mesoscale Discussion 1615Aug 3, 5:21 PM MDT

676 
WWUS20 KWNS 032036
SEL4  
SPC WW 032036
COZ000-WYZ000-040400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 464
NWS STORM PREDICTION CENTER NORMAN OK
235 PM MDT SAT AUG 3 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  THE NORTHEAST QUARTER OF COLORADO
  PARTS OF SOUTHEAST WYOMING

* EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 235 PM UNTIL
  1000 PM MDT.

* PRIMARY THREATS INCLUDE...
  A FEW TORNADOES POSSIBLE
  SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO 2
    INCHES IN DIAMETER POSSIBLE
  SEVERAL DAMAGING WIND GUSTS TO 65 MPH POSSIBLE

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE
MILES EAST AND WEST OF A LINE FROM 45 MILES NORTH NORTHEAST OF
FORT COLLINS COLORADO TO 35 MILES SOUTH OF LIMON COLORADO.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU4).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 463...

DISCUSSION...THUNDERSTORMS CONTINUE DEVELOPING ACROSS NORTHEAST
COLORADO AND INTO ADJACENT SOUTHEAST WYOMING THIS AFTERNOON...WITHIN
A MOIST LOW-LEVEL AIRMASS WHICH IS SUPPORTING MODERATE INSTABILITY. 
STORMS SHOULD CONTINUE TO INCREASE IN COVERAGE THIS AFTERNOON --
LIKELY EVENTUALLY GROWING UPSCALE INTO AN MCS WITH TIME.  UNTIL
THEN...MORE ISOLATED MULTICELL/SUPERCELL STORMS WILL PERSIST...WITH
THREATS FOR LARGE HAIL AND DAMAGING WINDS PREVAILING.  AN ISOLATED
TORNADO THREAT ALSO EXISTS -- PARTICULARLY ACROSS THE
MORGAN/WASHINGTON COUNTY VICINITY OF NORTHEAST COLORADO NEAR THE
WELL-DEFINED SURFACE BOUNDARY CURRENTLY LYING ACROSS THIS AREA.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 55 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 27015.


...GOSS

Tornado Watches in Colorado, 2013Every tornado watch in 2013

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.