Alert archive / Colorado / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 32, NWS Denver/Boulder, CO

May 31, 2006Morgan County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at May 31, 2006, 5:17 PM MDT for Morgan 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 counties it named.

The facts

Issued: May 31, 2006, 5:17 PM MDT (23:17 UTC)
Expired: May 31, 2006, 5:45 PM MDT
In force: 28 min
Issued by: NWS Denver/Boulder, CO
Area: Counties, with a storm outline in the text

County Morgan County, CO

The radar

The Denver radar (KFTG), 82 km from the middle of the area, began a volume at 23:18 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.

Issued	Product	Office	Lasted
May 31, 1:35 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 11.3 hours before the alert went out and 66 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: 28 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 877 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 68 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Denver/Boulder, CO wrote its last area forecast discussion before this severe thunderstorm warning went out at May 31, 2:43 PM MDT, 2 hours 34 minutes earlier.

Area forecast discussion, May 31, 2:43 PM MDT, 2 hours 34 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DENVER CO
243 PM MDT WED MAY 31 2006

.SHORT TERM DISCUSSION...FOR THE REST OF THIS AFTN AND EVENING...THE
TAIL END OF AN UPPER TROF AXIS ASSOCIATED WITH A SHORT WAVE MOVING
INTO WRN SOUTH DAKOTA...WILL MAKES ITS WAY THROUGH THE NERN PLAINS.
THE NAM/GFS BOTH THOSE UPWARD QG OMEGA AT ALL LEVELS THROUGH 06Z
BEFORE SUBSIDENCE DVLPS.  THE GFS IS SLOER THAN THE NAM.  IN ANY
EVENT...THE STORMS WILL BE AIDED BY SOME WEAK DYNAMICS AS WELL.  THE
INTERACTIVE SOUNDINGS YIELDED CAPES IN THE 1000-1500 J/KG WITH
SUFFICIENT SHEAR TO PRODUCE LARGE HAIL AND ISOLD TORNADOES.  SHOULD
SEE STORMS ALONG THE NRN BDR TRACK TO SOUTHEAST ONCE THE MID AND
UPPER LEVEL WINDS BECOME MORE NWLY.  PCPN OVER PARTS OF THE ERN
PLAINNS MAY HANG ON PAST MIDNIGHT...SO WILL KEEP SLGT CHC THERE
LATE.  FOR TUESDAY...UPPER RDG WILL BE OVER COLORADO WITH ENUF MSTR
TRAPPED UNDER THE RIDGE TO WARRANT SLGT CHC OF THUNDERSTORMS.  WILL
HEDGE THINGS MORE TOWARDS THE SRN HALF OF THE CWFA.  INTERACTIVE
SOUDING SHOW CAPES AROUND 1000 J/KG WITH ANOTHER DENVER CYCLONE
PRESENT.  COVERAGE OF STORMS HOWEVER WILL BE LOWER AND THIS ALREADY
REFLECTED IN THE GRIDS.  NO BIG CHANGES TO THE TEMPERATURE ATTM.

.LONG TERM DISCUSSION...THU NGT-SAT...AN UPR RDG WILL BUILD OVER
THE CNTRL RCKYS THRU PRD.  THE SUBSIDENCE WILL STABILIZE THE AIR
MASS.  HWVR WILL KEEP A SLGT CHC OF TSTMS IN MTNS AND PALMER DVD
TO S AND SW OF METRO DEN ON THU EVE DUE TO LINGERING INSTABILITY
OVR THE HIR TRRN.  WITH GUD WRMG ALF TEMPS WILL CONT TO INCREASE
EACH DAY WITH MAX TEMPS WRMG TO NR A RECORD AT DEN ON SAT.  WILL
GENLY GO A SMIDGEN WARMER THAN MOS TEMP GDNC VALUES.

IN EXTENDED PRD...SUN-WED...MDLS MAINTAIN UPR RDG OVR CNTRL RCKYS
THRU PRD.  AMS WILL BE GENLY WARM...DRY AND STBL...ALTHO DEEP LYR
MEAN CIRC INDICATES SUM EARLY MONSOONAL MSTR FM MEX WRAPPING ARND
UPR LO BY THE MIDDLE OF NEXT WK.  WILL TAKE A WAIT AND SEE APPRCH
TO THIS PSBL DVLPMNT AND NOT ADD ANY PCPN TO CURRENT FCST ATTM.

&&

.BOU WATCHES/WARNINGS/ADVISORIES...NONE.

&&

COOPER/GARD...WFO BOULDER

Hazardous weather outlook, May 31, 10:40 AM MDT, 6 hours 37 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DENVER CO
1040 AM MDT WED MAY 31 2006

COZ030>051-011200-
JACKSON COUNTY BELOW 9000 FEET-WEST JACKSON AND WEST GRAND
COUNTIES ABOVE 9000 FEET-GRAND AND SUMMIT COUNTIES BELOW 9000
FEET-SOUTH AND EAST JACKSON/LARIMER/NORTH AND NORTHEAST GRAND/
NORTHWEST BOULDER COUNTIES ABOVE 9000 FEET-SOUTH AND SOUTHEAST
GRAND/WEST CENTRAL AND SOUTHWEST BOULDER/GILPIN/CLEAR CREEK/
SUMMIT/NORTH AND WEST PARK COUNTIES ABOVE 9000 FEET-LARIMER AND
BOULDER COUNTIES BETWEEN 6000 AND 9000 FEET-JEFFERSON AND WEST
DOUGLAS COUNTIES ABOVE 6000 FEET/GILPIN/CLEAR CREEK/NORTHEAST PARK
COUNTIES BELOW 9000 FEET-CENTRAL AND SOUTHEAST PARK COUNTY-LARIMER
COUNTY BELOW 6000 FEET/NORTHWEST WELD COUNTY-BOULDER AND JEFFERSON
COUNTIES BELOW 6000 FEET/WEST BROOMFIELD COUNTY-NORTH DOUGLAS
COUNTY BELOW 6000 FEET/DENVER/WEST ADAMS AND ARAPAHOE COUNTIES/
EAST BROOMFIELD COUNTY-ELBERT/CENTRAL AND EAST DOUGLAS COUNTIES
ABOVE 6000 FEET-NORTHEAST WELD COUNTY-CENTRAL AND SOUTH WELD
COUNTY-MORGAN COUNTY-CENTRAL AND EAST ADAMS AND ARAPAHOE COUNTIES-
NORTH AND NORTHEAST ELBERT COUNTY BELOW 6000 FEET/NORTH LINCOLN
COUNTY-SOUTHEAST ELBERT COUNTY BELOW 6000 FEET/SOUTH LINCOLN
COUNTY-LOGAN COUNTY-WASHINGTON COUNTY-SEDGWICK COUNTY-PHILLIPS
COUNTY-
1040 AM MDT WED MAY 31 2006

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL
COLORADO.

.DAY ONE...TODAY AND TONIGHT

SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED TO DEVELOP ALONG
THE FRONT RANGE AND ADJACENT PLAINS THIS AFTERNOON AND EARLY
EVENING.  SOME OF THE STORMS COULD BE SEVERE WITH LARGE HAIL THE
MAIN THREAT.  ENOUGH SHEAR WILL BE PRESENT IN THE ATMOSPHERE FOR AN
ISOLATED TORNADO OR TWO AS WELL.

ABUNDANT MOISTURE MOVED INTO AREAS ALONG AND EAST OF THE FRONT RANGE
DURING THE NIGHT. LINGERING CLOUDINESS IN THE MORNING WILL DELAY
SOLAR HEATING SOMEWHAT IN THESE AREAS...HOWEVER THE MOUNTAINS WILL
SEE ENOUGH SUNSHINE DURING THE MORNING HOURS TO BEGIN GENERATING
THUNDERSTORMS BY THE NOON HOUR.  THESE STORMS WILL THEN DRIFT OFF TO
THE EAST THROUGHOUT THE AFTERNOON AND EVENING.

THE BEST POTENTIAL FOR SEVERE WEATHER WILL EXIST EAST AND SOUTH OF
THE DENVER METRO AREA.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THERE WILL BE A SLIGHT CHANCE OF AFTERNOON AND EVENING SHOWERS
AND THUNDERSTORMS MAINLY ALONG AND NEAR THE EASTERN SLOPES OF THE
MOUNTAINS ON THURSDAY AND FRIDAY.  A FEW OF THE STORMS MAY SPREAD
OVER THE PLAINS ON THURSDAY.

NO THUNDERSTORMS ARE EXPECTED OVER THE WEEKEND AND THROUGH EARLY
NEXT WEEK.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED AFTER 2 PM THIS AFTERNOON.

COOPER/GARD...WFO BOULDER

In the hours before

Local storm report, May 31, 3:31 PM MDT, 1 hour 46 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE DENVER CO
331 PM MDT WED MAY 31 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0325 PM     HAIL             1 W AGATE               39.47N 103.97W
05/31/2006  E1.00 INCH       ELBERT             CO   STORM CHASER

            ON I-70.

0314 PM     HAIL             4 NW GROVER             40.90N 104.28W
05/31/2006  E1.00 INCH       WELD               CO   TRAINED SPOTTER

&&

CLB

Local storm report, May 31, 3:38 PM MDT, 1 hour 39 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE DENVER CO
338 PM MDT WED MAY 31 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0337 PM     HAIL             3 E DEER TRAIL          39.62N 103.99W
05/31/2006  E1.00 INCH       ARAPAHOE           CO   NWS EMPLOYEE

            HAIL 6 INCHES DEEP COVERING I-70.

0325 PM     HAIL             1 W AGATE               39.47N 103.97W
05/31/2006  E1.00 INCH       ELBERT             CO   STORM CHASER

            ON I-70.

0314 PM     HAIL             4 NW GROVER             40.90N 104.28W
05/31/2006  E1.00 INCH       WELD               CO   TRAINED SPOTTER

&&

CLB

Local storm report, May 31, 3:50 PM MDT, 1 hour 27 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE DENVER CO
350 PM MDT WED MAY 31 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0337 PM     HAIL             8 SE DEER TRAIL         39.53N 103.94W
05/31/2006  E1.25 INCH       ELBERT             CO   NWS EMPLOYEE

            HAIL 6 INCHES DEEP COVERING I-70. CORRECTED SIZE AND
            LOCATION.

0325 PM     HAIL             1 W AGATE               39.47N 103.97W
05/31/2006  E1.00 INCH       ELBERT             CO   STORM CHASER

            ON I-70.

0314 PM     HAIL             4 NW GROVER             40.90N 104.28W
05/31/2006  E1.00 INCH       WELD               CO   TRAINED SPOTTER

&&

CLB

Local storm report, May 31, 4:20 PM MDT, 57 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE DENVER CO
420 PM MDT WED MAY 31 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0337 PM     HAIL             8 SE DEER TRAIL         39.53N 103.94W
05/31/2006  E1.25 INCH       ELBERT             CO   NWS EMPLOYEE

            HAIL 6 INCHES DEEP COVERING I-70. CORRECTED SIZE AND
            LOCATION.

0325 PM     HAIL             1 W AGATE               39.47N 103.97W
05/31/2006  E1.00 INCH       ELBERT             CO   STORM CHASER

            ON I-70.

0314 PM     HAIL             4 NW GROVER             40.90N 104.28W
05/31/2006  E1.00 INCH       WELD               CO   TRAINED SPOTTER

0305 PM     HAIL             15 E ROCKPORT           40.90N 104.51W
05/31/2006  E1.75 INCH       WELD               CO   TRAINED SPOTTER

            EXTENSIVE CROP AND ROOF DAMAGE. WINDSHIELDS BROKEN. TREE
            LIMBS DOWN.

0305 PM     HAIL             15 E ROCKPORT           40.90N 104.51W
05/31/2006  E1.75 INCH       WELD               CO   AMATEUR RADIO

            EXTENSIVE CROP AND ROOF DAMAGE. BROKEN WINDSHIELDS. TREE
            LIMBS DOWN.

&&

CLB

Local storm report, May 31, 4:45 PM MDT, 32 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE DENVER CO
445 PM MDT WED MAY 31 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0442 PM     HAIL             GENOA                   39.28N 103.50W
05/31/2006  E1.00 INCH       LINCOLN            CO   TRAINED SPOTTER

0337 PM     HAIL             8 SE DEER TRAIL         39.53N 103.94W
05/31/2006  E1.25 INCH       ELBERT             CO   NWS EMPLOYEE

            HAIL 6 INCHES DEEP COVERING I-70. CORRECTED SIZE AND
            LOCATION.

0325 PM     HAIL             1 W AGATE               39.47N 103.97W
05/31/2006  E1.00 INCH       ELBERT             CO   STORM CHASER

            ON I-70.

0314 PM     HAIL             4 NW GROVER             40.90N 104.28W
05/31/2006  E1.00 INCH       WELD               CO   TRAINED SPOTTER

0305 PM     HAIL             15 E ROCKPORT           40.90N 104.51W
05/31/2006  E1.75 INCH       WELD               CO   TRAINED SPOTTER

            EXTENSIVE CROP AND ROOF DAMAGE. WINDSHIELDS BROKEN. TREE
            LIMBS DOWN.

0305 PM     HAIL             15 E ROCKPORT           40.90N 104.51W
05/31/2006  E1.75 INCH       WELD               CO   AMATEUR RADIO

            EXTENSIVE CROP AND ROOF DAMAGE. BROKEN WINDSHIELDS. TREE
            LIMBS DOWN.

&&

CLB

Local storm report, May 31, 4:51 PM MDT, 26 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE DENVER CO
451 PM MDT WED MAY 31 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0442 PM     HAIL             GENOA                   39.28N 103.50W
05/31/2006  E1.00 INCH       LINCOLN            CO   TRAINED SPOTTER

0432 PM     HAIL             6 S NEW RAYMER          40.52N 103.83W
05/31/2006  E0.88 INCH       MORGAN             CO   TRAINED SPOTTER

            THREE INCHES DEEP. VEGETATION DAMAGE.

0337 PM     HAIL             8 SE DEER TRAIL         39.53N 103.94W
05/31/2006  E1.25 INCH       ELBERT             CO   NWS EMPLOYEE

            HAIL 6 INCHES DEEP COVERING I-70. CORRECTED SIZE AND
            LOCATION.

0325 PM     HAIL             1 W AGATE               39.47N 103.97W
05/31/2006  E1.00 INCH       ELBERT             CO   STORM CHASER

            ON I-70.

0314 PM     HAIL             4 NW GROVER             40.90N 104.28W
05/31/2006  E1.00 INCH       WELD               CO   TRAINED SPOTTER

0305 PM     HAIL             15 E ROCKPORT           40.90N 104.51W
05/31/2006  E1.75 INCH       WELD               CO   TRAINED SPOTTER

            EXTENSIVE CROP AND ROOF DAMAGE. WINDSHIELDS BROKEN. TREE
            LIMBS DOWN.

0305 PM     HAIL             15 E ROCKPORT           40.90N 104.51W
05/31/2006  E1.75 INCH       WELD               CO   AMATEUR RADIO

            EXTENSIVE CROP AND ROOF DAMAGE. BROKEN WINDSHIELDS. TREE
            LIMBS DOWN.

&&

CLB

The office that day

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

Issued	Product	Office	Counties	Lasted
May 30, 8:12 PM MDT	Severe Thunderstorm Warning	BOU	Elbert	48 min
May 31, 2:04 PM MDT	Tornado Warning	BOU	Arapahoe	26 min
May 31, 2:19 PM MDT	Severe Thunderstorm Warning	BOU	Weld	56 min
May 31, 2:44 PM MDT	Severe Thunderstorm Warning	BOU	Logan	31 min
May 31, 2:50 PM MDT	Severe Thunderstorm Warning	BOU	Arapahoe, Elbert	55 min
May 31, 3:16 PM MDT	Severe Thunderstorm Warning	BOU	Weld	59 min
May 31, 3:46 PM MDT	Severe Thunderstorm Warning	BOU	Elbert, Lincoln	59 min
May 31, 4:02 PM MDT	Tornado Warning	BOU	Weld	28 min
May 31, 4:36 PM MDT	Severe Thunderstorm Warning	BOU	Lincoln	24 min

Nearby

Severe Thunderstorm Warnings in Colorado, 2006 Every severe thunderstorm warning in 2006

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.