Alert archive / Colorado / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 12, NWS Grand Junction, CO

June 30, 2011Eagle County, Routt County, Colorado

NWS Grand Junction, CO issued this severe thunderstorm warning at Jun 30, 2011, 3:24 PM MDT for Eagle County, Routt County, Colorado. It was in force for 51 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: Jun 30, 2011, 3:24 PM MDT (21:24 UTC)
Expired: Jun 30, 2011, 4:15 PM MDT
In force: 51 min
Issued by: NWS Grand Junction, CO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Eagle County, CO, Routt County, CO

The radar

The Grand Junction radar (KGJX), 161 km from the middle of the area, began a volume at 21:25 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
Jun 30, 9:06 AM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Grand Junction, CO (KGJT), launched 12:00Z, 9.4 hours before the alert went out and 175 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: -222 J/kg
Mixed-layer LCL: 2557 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 279 m²/s²
0-3 km storm-relative helicity: 248 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 Grand Junction, CO wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 30, 3:17 PM MDT, 7 minutes earlier.

Area forecast discussion, Jun 30, 3:17 PM MDT, 7 minutes before

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Hazardous weather outlook, Jun 30, 10:00 AM MDT, 5 hours 24 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
1000 AM MDT THU JUN 30 2011

COZ001>014-017>023-UTZ022>025-027>029-011200-
ANIMAS RIVER BASIN-ARCHES/GRAND FLAT-CANYONLANDS/NATURAL BRIDGES-
CENTRAL COLORADO RIVER BASIN-
CENTRAL GUNNISON AND UNCOMPAHGRE RIVER BASIN-
CENTRAL YAMPA RIVER BASIN-DEBEQUE TO SILT CORRIDOR-
EASTERN UINTA BASIN-EASTERN UINTA MOUNTAINS-
ELKHEAD AND PARK MOUNTAINS-FLAT TOPS-
FOUR CORNERS/UPPER DOLORES RIVER-
GORE AND ELK MOUNTAINS/CENTRAL MOUNTAINS-GRAND AND BATTLEMENT MESAS-
GRAND VALLEY-LA SAL AND ABAJO MOUNTAINS-LOWER YAMPA RIVER BASIN-
NORTHWEST SAN JUAN MOUNTAINS-PARADOX VALLEY/LOWER DOLORES RIVER-
ROAN AND TAVAPUTS PLATEAUS-SAN JUAN RIVER BASIN-SOUTHEAST UTAH-
SOUTHWEST SAN JUAN MOUNTAINS-TAVAPUTS PLATEAU-
UNCOMPAHGRE PLATEAU AND DALLAS DIVIDE-UPPER GUNNISON RIVER VALLEY-
UPPER YAMPA RIVER BASIN-WEST ELK AND SAWATCH MOUNTAINS-
1000 AM MDT THU JUN 30 2011

...SEVERE THUNDERSTORM WATCH 576 IN EFFECT UNTIL 6 PM THIS EVENING
FOR EASTERN UTAH AND MUCH OF WESTERN COLORADO...
...RED FLAG IN EFFECT FOR THE VALLEYS OF SOUTHWEST COLORADO THIS
AFTERNOON AND EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN UTAH AND WESTERN
COLORADO.

.DAY ONE...TODAY AND TONIGHT...

SCATTERED THUNDERSTORMS...SOME SEVERE...WILL CONTINUE THROUGH THIS
EVENING. STRONG...DAMAGING WINDS IN EXCESS OF 58 MPH AND LARGE HAIL
WILL BE POSSIBLE WITH THE STRONGEST STORMS.

ABOVE NORMAL TEMPERATURES DURING THE PREVIOUS FEW DAYS WILL KEEP
RIVERS RUNNING HIGH AND FAST THROUGH TONIGHT. NUMEROUS FLOOD
ADVISORIES AND WARNINGS REMAIN IN EFFECT FOR MUCH OF NORTHWEST
COLORADO AND NORTHEAST UTAH.

PLEASE VISIT THE NATIONAL WEATHER SERVICE GRAND JUNCTION WEBSITE AT
WEATHER.GOV/GJT FOR THE LATEST INFORMATION.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...

SHOWERS AND THUNDERSTORMS WILL CONTINUE THROUGH THURSDAY EVENING. HOT
AND DRY CONDITIONS RETURN SATURDAY THROUGH THE FIRST PART OF THE WEEK
WITH STORMS POSSIBLE OVER THE HIGHER TERRAIN AS MOISTURE WORKS ITS
WAY IN BY EARLY NEXT WEEK FROM THE SOUTH.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED TODAY OR TONIGHT.

TGJT

In the hours before

Local storm report, Jun 30, 1:48 PM MDT, 1 hour 36 minutes before

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Local storm report, Jun 30, 1:51 PM MDT, 1 hour 33 minutes before

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Special weather statement, Jun 30, 2:17 PM MDT, 1 hour 7 minutes before

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Local storm report, Jun 30, 2:35 PM MDT, 49 minutes before

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Local storm report, Jun 30, 2:39 PM MDT, 45 minutes before

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Special weather statement, Jun 30, 3:00 PM MDT, 24 minutes before

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The office that day

Everything else NWS Grand Junction, CO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 29, 6:22 PM MDT	Special Weather Statement	GJT	Garfield	38 min
Jun 30, 5:52 AM MDT	Special Weather Statement	GJT		38 min
Jun 30, 7:56 AM MDT	River Flood Warning	GJT	Routt	10 hr
Jun 30, 8:33 AM MDT	Special Weather Statement	GJT	Garfield	42 min
Jun 30, 9:13 AM MDT	Special Weather Statement	GJT	Garfield	47 min
Jun 30, 9:40 AM MDT	Special Weather Statement	GJT	Delta	50 min
Jun 30, 10:51 AM MDT	Special Weather Statement	GJT	Delta	39 min
Jun 30, 11:17 AM MDT	Special Weather Statement	GJT	Delta	28 min
Jun 30, 11:28 AM MDT	Severe Thunderstorm Warning	GJT	Moffat, Rio Blanco	62 min
Jun 30, 12:13 PM MDT	Special Weather Statement	GJT	Mesa	47 min
Jun 30, 12:18 PM MDT	Severe Thunderstorm Warning	GJT	Moffat, Rio Blanco	42 min
Jun 30, 12:28 PM MDT	Severe Thunderstorm Warning	GJT	Moffat, Rio Blanco	47 min
Jun 30, 12:40 PM MDT	Special Weather Statement	GJT	Delta, Garfield, Mesa, Montrose	65 min
Jun 30, 12:41 PM MDT	Severe Thunderstorm Warning	GJT	Garfield, Rio Blanco	49 min
Jun 30, 12:55 PM MDT	Severe Thunderstorm Warning	GJT	Moffat	50 min
Jun 30, 1:18 PM MDT	Areal Flood Advisory	GJT	Garfield, Moffat, Rio Blanco, Routt	3 hr
Jun 30, 1:26 PM MDT	Special Weather Statement	GJT	Rio Blanco	49 min
Jun 30, 1:35 PM MDT	Special Weather Statement	GJT	Hinsdale, Montrose, Ouray, San Juan	55 min
Jun 30, 1:47 PM MDT	Special Weather Statement	GJT	Routt	28 min
Jun 30, 2:17 PM MDT	Special Weather Statement	GJT	Mesa	43 min
Jun 30, 2:28 PM MDT	Severe Thunderstorm Warning	GJT	Mesa	36 min
Jun 30, 2:38 PM MDT	Severe Thunderstorm Warning	GJT	Eagle, Pitkin	52 min
Jun 30, 3:00 PM MDT	Special Weather Statement	GJT	Pitkin	60 min
Jun 30, 5:01 AM MDT	Special Weather Statement	GJT	San Juan	44 min
Jun 30, 10:07 AM MDT	Special Weather Statement	GJT	Grand	38 min
Jun 30, 10:39 AM MDT	Special Weather Statement	GJT	Uintah	51 min
Jun 30, 10:45 AM MDT	Severe Thunderstorm Warning	GJT	Grand, Uintah	45 min
Jun 30, 11:43 AM MDT	Special Weather Statement	GJT	Grand	32 min

Nearby

Severe Thunderstorm Warnings in Colorado, 2011 Every severe thunderstorm warning in 2011

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.