Tornado Watch 490

Issued

Aug 17, 2015, 2:32 PM MDT (20:32 UTC)

Expired

Aug 17, 2015, 9:51 PM MDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

60 kt

The Denver radar (KFTG), 27 km from the middle of the area, began a volume at 20:33 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.

Two or more tornadoes

50%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

30%

One or more gusts of 65 knots or more

10%

Ten or more severe hail reports

70%

One or more hailstones of 2 inches or more

40%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 1696Aug 17, 1:06 PM MDT
• Mesoscale Discussion 1698Aug 17, 1:59 PM MDT
• Mesoscale Discussion 1700Aug 17, 4:41 PM MDT
• Mesoscale Discussion 1702Aug 17, 8:36 PM MDT

558 
WWUS20 KWNS 172029
SEL0  
SPC WW 172029
COZ000-180500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 490
NWS STORM PREDICTION CENTER NORMAN OK
230 PM MDT MON AUG 17 2015

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  EASTERN COLORADO

* EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 230 PM UNTIL
  1100 PM MDT.

* PRIMARY THREATS INCLUDE...
  A FEW TORNADOES POSSIBLE
  SCATTERED LARGE HAIL LIKELY WITH ISOLATED VERY LARGE HAIL EVENTS
    TO 2.5 INCHES IN DIAMETER POSSIBLE
  ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

SUMMARY...THUNDERSTORMS EXPECTED TO MOVE / DEVELOP EAST FROM THE CO
FRONT RANGE THROUGH EARLY THIS EVENING...WITH ADDITIONAL STORMS
POSSIBLY FORMING FARTHER EAST ACROSS THE ADJACENT HIGH PLAINS. A FEW
SUPERCELLS WITH VERY LARGE HAIL...LOCALLY DAMAGING WIND...AND A FEW
TORNADOES APPEAR LIKELY. THE STORMS SHOULD EVOLVE INTO ONE OR TWO
CLUSTERS LATER TONIGHT.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE
MILES EAST AND WEST OF A LINE FROM 50 MILES NORTHEAST OF FORT
COLLINS COLORADO TO 10 MILES EAST SOUTHEAST OF LA JUNTA COLORADO.
 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU0).

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.

&&

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 30025.


...CORFIDI

Tornado Watches in Colorado, 2015Every tornado watch in 2015

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.