Alert archive / Colorado / Severe Thunderstorm Warnings in 2013
Severe Thunderstorm Warning 193, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Aug 10, 2013, 7:20 PM MDT for Adams County, Arapahoe County, Colorado. It was in force for 25 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
- Aug 10, 2013, 7:20 PM MDT (01:20 UTC)
- Expired
- Aug 10, 2013, 7:45 PM MDT
- In force
- 25 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Adams County, CO, Arapahoe County, CO
The radar
The Denver radar (KFTG), 18 km from the middle of the area, began a volume at 01:23 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 nearest sounding before it
Denver, CO (KDEN), launched 00:00Z, 1.3 hours before the alert went out and 95 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.
- Mixed-layer CAPE
- 1 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3477 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- -33 m²/s²
- 0-3 km storm-relative helicity
- 51 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
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 Aug 10, 3:43 PM MDT, 3 hours 37 minutes earlier.
Area forecast discussion, Aug 10, 3:43 PM MDT, 3 hours 37 minutes before
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</html>Hazardous weather outlook, Aug 10, 10:56 AM MDT, 8 hours 24 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DENVER/BOULDER CO 1056 AM MDT SAT AUG 10 2013 COZ030>051-111700- 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- 1056 AM MDT SAT AUG 10 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL COLORADO. .DAY ONE...TODAY AND TONIGHT SCATTERED THUNDERSTORMS WILL AGAIN FORM OVER THE MOUNTAINS AND HIGHER FOOTHILLS EARLY THIS AFTERNOON. A FEW OF THESE STORMS WILL MOVE EAST OVER THE NEARBY PLAINS BY AROUND MID-AFTERNOON AS THE ATMOSPHERE BECOMES WARMER AND MORE UNSTABLE. FARTHER OUT ON THE PLAINS...THERE IS A GREATER CHANCE FOR THUNDERSTORMS FORMING ALONG A WIND CONVERGENCE BOUNDARY STRETCHING FROM NEAR KIOWA IN ELBERT COUNTY TO NEAR STERLING IN LOGAN COUNTY. SOME OF THESE STORMS COULD BRIEFLY TURN SEVERE LATE THIS AFTERNOON OR EARLY THIS EVENING. HAILSTONES UP TO 1 INCH IN DIAMETER AND WIND GUSTS TO 60 MPH WILL BE THE MAIN THREATS. ALL OTHER STORMS THIS AFTERNOON AND EARLY EVENING WILL BE CAPABLE OF WIND GUSTS TO AROUND 45 MPH... DANGEROUS LIGHTNING AND LIGHT TO MODERATE RAINFALL. THIS STORM ACTIVITY SHOULD END BEFORE MIDNIGHT. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY THERE WILL BE A CHANCE OF AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS IN THE MOUNTAINS AND FOOTHILLS SUNDAY THROUGH WEDNESDAY. CHANCES WILL DECREASE LATE IN THE WEEK WITH A DRIER WARMER AIRMASS MOVING IN. THERE WILL BE A SLIGHT CHANCE OF SHOWERS AND STORMS OVER THE PLAINS SUNDAY...THEN BETTER CHANCES MONDAY AND TUESDAY. IT WILL GO BACK TO A SLIGHT CHANCE OF LATE DAY SHOWERS AND THUNDERSTORMS WEDNESDAY AND THURSDAY. FRIDAY LOOKS DRY. THE STORMS ON MONDAY AND TUESDAY MAY PRODUCE HEAVY RAINFALL AMOUNTS ACROSS MUCH OF THE FORECAST AREA. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY OR TONIGHT.
In the hours before
Special weather statement, Aug 10, 5:56 PM MDT, 1 hour 24 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 556 PM MDT SAT AUG 10 2013 COZ035-036-039-040-110015- NORTH DOUGLAS COUNTY BELOW 6000 FEET/DENVER/WEST ADAMS AND ARAPAHOE COUNTIES/EAST BROOMFIELD COUNTY-JEFFERSON AND WEST DOUGLAS COUNTIES ABOVE 6000 FEET/GILPIN/CLEAR CREEK/NORTHEAST PARK COUNTIES BELOW 9000 FEET-LARIMER AND BOULDER COUNTIES BETWEEN 6000 AND 9000 FEET-BOULDER AND JEFFERSON COUNTIES BELOW 6000 FEET/WEST BROOMFIELD COUNTY- 556 PM MDT SAT AUG 10 2013 THE NATIONAL WEATHER SERVICE HAS ISSUED A SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN JEFFERSON...EXTREME NORTHWESTERN ADAMS... BROOMFIELD AND SOUTHEASTERN BOULDER COUNTIES UNTIL 615 PM MDT. AT 555 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM OVER SOUTHWESTERN BROOMFIELD...OR 16 MILES NORTHWEST OF DENVER...MOVING SOUTHEAST AT 20 MPH. WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THIS STORM. LOCATIONS IMPACTED INCLUDE BUT ARE NOT LIMITED TO... SOUTHWESTERN THORNTON...ARVADA...WESTMINSTER...BROOMFIELD... NORTHGLENN...LAFAYETTE...LOUISVILLE...SUPERIOR...FEDERAL HEIGHTS AND ROCKY FLATS. PRECAUTIONARY/PREPAREDNESS ACTIONS... FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE SHELTER INSIDE A BUILDING OR VEHICLE. && LAT...LON 3992 10526 3999 10503 3985 10492 3978 10520 TIME...MOT...LOC 2355Z 324DEG 15KT 3992 10514 RPK
Special weather statement, Aug 10, 6:46 PM MDT, 34 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 646 PM MDT SAT AUG 10 2013 COZ040-110100- NORTH DOUGLAS COUNTY BELOW 6000 FEET/DENVER/WEST ADAMS AND ARAPAHOE COUNTIES/EAST BROOMFIELD COUNTY- 646 PM MDT SAT AUG 10 2013 THE NATIONAL WEATHER SERVICE HAS ISSUED A SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN ARAPAHOE...SOUTHWESTERN ADAMS AND SOUTHERN DENVER COUNTIES UNTIL 700 PM MDT. AT 645 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM OVER SOUTHWESTERN COMMERCE CITY...OR 5 MILES NORTH OF DENVER...MOVING SOUTHEAST AT 20 MPH. WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THIS STORM. LOCATIONS IMPACTED INCLUDE BUT ARE NOT LIMITED TO... DENVER...WESTERN AURORA...SOUTHWESTERN THORNTON AND SOUTHWESTERN COMMERCE CITY. PRECAUTIONARY/PREPAREDNESS ACTIONS... FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE SHELTER INSIDE A BUILDING OR VEHICLE. && LAT...LON 3965 10496 3984 10503 3989 10482 3971 10474 TIME...MOT...LOC 0045Z 327DEG 20KT 3981 10495 RPK
Special weather statement, Aug 10, 6:48 PM MDT, 32 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 648 PM MDT SAT AUG 10 2013 COZ040-041-110115- ELBERT/CENTRAL AND EAST DOUGLAS COUNTIES ABOVE 6000 FEET-NORTH DOUGLAS COUNTY BELOW 6000 FEET/DENVER/WEST ADAMS AND ARAPAHOE COUNTIES/EAST BROOMFIELD COUNTY- 648 PM MDT SAT AUG 10 2013 THE NATIONAL WEATHER SERVICE HAS ISSUED A SIGNIFICANT WEATHER ADVISORY FOR WESTERN ARAPAHOE AND EXTREME NORTHEASTERN DOUGLAS COUNTIES UNTIL 715 PM MDT. AT 648 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM OVER SOUTHWESTERN AURORA...OR 12 MILES SOUTHEAST OF DENVER...MOVING SOUTHEAST AT 10 MPH. HAIL UP TO THE SIZE OF NICKELS AND WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THIS STORM. LOCATIONS IMPACTED INCLUDE BUT ARE NOT LIMITED TO... AURORA...EASTERN CENTENNIAL...NORTHWESTERN PARKER AND ARAPAHOE PARK. PRECAUTIONARY/PREPAREDNESS ACTIONS... FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE SHELTER INSIDE A BUILDING OR VEHICLE. && LAT...LON 3965 10486 3972 10467 3960 10458 3952 10480 TIME...MOT...LOC 0048Z 335DEG 8KT 3963 10476 RPK
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 6:46 PM MDT | Special Weather Statement | BOU | Denver | 14 min |
| Aug 10, 6:48 PM MDT | Special Weather Statement | BOU | Denver | 27 min |
| Aug 10, 7:37 PM MDT | Severe Thunderstorm Warning | BOU | Adams | 38 min |
| Aug 10, 7:58 PM MDT | Special Weather Statement | BOU | Adams | 32 min |
| Aug 10, 9:10 PM MDT | Severe Thunderstorm Warning | BOU | Morgan | 50 min |
| Aug 10, 10:11 PM MDT | Special Weather Statement | BOU | Logan | 49 min |
| Aug 10, 11:09 PM MDT | Special Weather Statement | BOU | Lincoln | 51 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 2013Every severe thunderstorm warning in 2013
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.