Alert archive / Wyoming / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 152, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 24, 2011, 3:16 PM MDT for Laramie County, Wyoming. It was in force for 41 min. 3 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jul 24, 2011, 3:16 PM MDT (21:16 UTC)
- Expired
- Jul 24, 2011, 3:57 PM MDT
- In force
- 41 min
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
County Laramie County, WY
The radar
The Cheyenne radar (KCYS), 50 km from the middle of the area, began a volume at 21:19 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 24, 3:33 PM MDT | HAIL 1.75 | 4 S Gun Barrel, WY | NEAR COUNTY ROADS 147 AND 227. |
| Jul 24, 3:40 PM MDT | HAIL 1 | 13 N Burns, WY | |
| Jul 24, 3:51 PM MDT | TSTM WND GST 60 | 9 W Albin, WY | PEA TO MARBEL SIZE HAIL. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
Did it verify
Verified. The Iowa Environmental Mesonet's Cow matched 3 storm reports to this severe thunderstorm warning; the first came 17 minutes after it went out.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 9.3 hours before the alert went out and 194 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
- 55 J/kg
- Mixed-layer CIN
- -273 J/kg
- Mixed-layer LCL
- 2077 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- -13 m²/s²
- 0-3 km storm-relative helicity
- -25 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
890 WUUS55 KCYS 242116 SVRCYS WYC021-242215- /O.NEW.KCYS.SV.W.0152.110724T2116Z-110724T2215Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 316 PM MDT SUN JUL 24 2011 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EAST CENTRAL LARAMIE COUNTY IN SOUTHEAST WYOMING... * UNTIL 415 PM MDT * AT 312 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THIS STORM WAS LOCATED NEAR GUN BARREL...OR 28 MILES NORTHEAST OF CHEYENNE. THIS STORM WAS NEARLY STATIONARY. * THE SEVERE THUNDERSTORM WILL AFFECT MAINLY RURAL AREAS OF EAST CENTRAL LARAMIE COUNTY. PRECAUTIONARY/PREPAREDNESS ACTIONS... IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE HAIL AND DAMAGING WINDS. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER... PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS. TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN CHEYENNE. TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS. && LAT...LON 4143 10417 4128 10441 4142 10447 4148 10435 TIME...MOT...LOC 2116Z 316DEG 1KT 4141 10438 WIND...HAIL <50MPH 1.00IN $$ RUBIN
3 follow-up statements
978 WWUS55 KCYS 242133 SVSCYS SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 333 PM MDT SUN JUL 24 2011 WYC021-242215- /O.CON.KCYS.SV.W.0152.000000T0000Z-110724T2215Z/ LARAMIE WY- 333 PM MDT SUN JUL 24 2011 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EAST CENTRAL LARAMIE COUNTY UNTIL 415 PM MDT... AT 330 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THIS STORM WAS LOCATED NEAR GUN BARREL...OR 27 MILES NORTHEAST OF CHEYENNE...MOVING SOUTH AT 5 MPH. THE SEVERE THUNDERSTORM WILL AFFECT MAINLY RURAL AREAS OF EAST CENTRAL LARAMIE COUNTY. PRECAUTIONARY/PREPAREDNESS ACTIONS... TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN CHEYENNE. TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS. && LAT...LON 4143 10417 4128 10441 4142 10447 4148 10435 TIME...MOT...LOC 2133Z 341DEG 3KT 4138 10437 WIND...HAIL <50MPH 1.00IN $$ RUBIN
366 WWUS55 KCYS 242151 SVSCYS SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 351 PM MDT SUN JUL 24 2011 WYC021-242215- /O.CON.KCYS.SV.W.0152.000000T0000Z-110724T2215Z/ LARAMIE WY- 351 PM MDT SUN JUL 24 2011 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EAST CENTRAL LARAMIE COUNTY UNTIL 415 PM MDT... AT 348 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THIS STORM WAS LOCATED 7 MILES SOUTH OF GUN BARREL...OR 26 MILES NORTHEAST OF CHEYENNE...MOVING SOUTH AT 10 MPH. THE SEVERE THUNDERSTORM WILL AFFECT MAINLY RURAL AREAS OF EAST CENTRAL LARAMIE COUNTY. PRECAUTIONARY/PREPAREDNESS ACTIONS... TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN CHEYENNE. TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS. && LAT...LON 4145 10426 4143 10417 4128 10441 4135 10444 TIME...MOT...LOC 2151Z 352DEG 7KT 4133 10436 WIND...HAIL <50MPH 1.00IN $$ RUBIN
407 WWUS55 KCYS 242157 SVSCYS SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 357 PM MDT SUN JUL 24 2011 WYC021-242207- /O.CAN.KCYS.SV.W.0152.000000T0000Z-110724T2215Z/ LARAMIE WY- 357 PM MDT SUN JUL 24 2011 ...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL LARAMIE COUNTY IS CANCELLED... THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED AREA. TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN CHEYENNE. REMEMBER...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EAST CENTRAL LARAMIE COUNTY UNTIL 500 PM MDT. LAT...LON 4145 10426 4143 10417 4128 10441 4135 10444 TIME...MOT...LOC 2157Z 352DEG 7KT 4132 10436 $$ RUBIN
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 Cheyenne, WY wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 24, 11:30 AM MDT, 3 hours 46 minutes earlier.
Area forecast discussion, Jul 24, 11:30 AM MDT, 3 hours 46 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHEYENNE WY 1130 AM MDT SUN JUL 24 2011 .AVIATION...020-030 CIGS IN WRN NEBR PANHANDLE LIFTING WITH SOME WNW FLOW ALOFT HELPING TO DISSIPATE. SOUTHEAST SURFACE FLOW CONTINUES WITH STRONGEST WINDS AIA AND SNY. WITH CU FORMING ALONG FRONT RANGE AND SFC INSTABILITY IN PANHANDLE COULD SEE A FEW TSTMS AFT 22Z FROM CYS EAST TO SNY AND NORTH TO CDR. DRIER AIR STILL FILTERING IN FROM WEST OF LARAMIE RANGE SO DO NOT EXPECT MORE THAN ISOLD COVERAGE. MAY BE SOME MVFR CONDITIONS NEAR SOME OF THE TSTMS BU MAINLY VFR CONDITIONS WILL PREVAIL. CLR TO SCT CLOUDS AFT 03Z. && .PREV DISCUSSION...ISSUED 304 AM MDT SUN JUL 24 2011. SHORT TERM...TODAY THROUGH TUESDAY...CURRENT FOG PRODUCT SATELLITE LOOP SHOWS SOME LOW STRATUS CLOUDS DEVELOPING OVER THE SOUTHERN NEBRASKA PANHANDLE AROUND SIDNEY AND KIMBALL...WITH SOME DEVELOPMENT FURTHER NORTH AS WELL. EXPECT THIS CLOUD DECK TO LOWER AND DRIFT FURTHER WEST...POSSIBLY UP AGAINST THE LARAMIE RANGE BY DAYBREAK. DO NOT EXPECT ANY WIDESPREAD DENSE FOG...ALTHOUGH THE I80 SUMMIT BE HAVE SOME DENSE FOG AT TIMES THIS MORNING IF THE LOW CLOUDS PUSH FURTHER TO THE WEST. WITH PLENTY OF LLVL MOISTURE PRESENT THIS MORNING AS DEWPOINTS RETURN TO THE UPPER 50S TO MIDDLE 60S...EXPECTED A GREATER CHANCE OF SHOWERS AND TSTORMS THIS AFTERNOON AND THIS EVENING MAINLY ALONG AND EAST OF THE LARAMIE RANGE. THERE IS SOME JET DYNAMICS ALOFT...SO SOME OF THESE TSTORMS MAY BECOME STRONG LATE THIS AFTERNOON WITH SMALL HAIL...GUSTY WINDS...AND FREQUENT LIGHTNING THE PRIMARY THREATS. FOR MONDAY AND TUESDAY...MODELS SHOW THE UPPER LEVEL HIGH ACROSS THE SOUTHERN PLAINS BUILDING WESTWARD INTO THE FOUR CORNERS REGION. SUBTROPICAL MOISTURE IS EXPECTED TO RETURN TO THE AREA LATE MONDAY AND TUESDAY AS THE STRONG UPPER LEVEL HIGH THEN DRIFTS SOUTHWARD INTO TEXAS AND A WEAK PACIFIC TROUGH PUSHES ONSHORE ALONG THE PAC NW COASTLINE. A GREATER COVERAGE OF SHOWERS AND TSTORMS IS EXPECTED BY TUESDAY AS PW/S OVER 1.00 ARE EXPECTED ACROSS THE FORECAST AREA...AND VALUES CLOSER TO 1.50 INCHES OVER THE HIGH PLAINS. HIGH TEMPS WILL WARM BACK INTO THE UPPER 80S TO MIDDLE 90S ACROSS MOST OF THE AREA WITH WIDELY SCATTERED TSTORMS POSSIBLE IN THE AFTERNOON...ESPECIALLY FURTHER SOUTH NEAR THE COLORADO BORDER ALONG I80. LONG TERM...WEDESDAY NIGHT THROUGH SATURDAY DIURNAL THUNDERSTORMS WILL OCCUR EACH DAY IN THE EXTENDED PERIOD. WEST TO SOUTHWEST FLOW WILL BE ALOFT OVER THE AREA EACH DAY. THE EDGE OF THE MOON SOON PLUME WILL CONTINUE TO MOVE OVER THE CWA IN THE EXTENDED FORECAST AREA ON WED...BUT WILL SHIFT EAST OF THE AREA ON THU. THE EDGE OF THE PLUME WILL PUSH BACK INTO THE AREA FRI AND SAT. THE MAIN DISTURBANCES WILL STAY NORTH OF THE AREA BUT WEAK IMPULSES IN THE FLOW WILL AID IN THUNDERSTORM DEVELOPMENT. THE THUNDERSTORMS WILL BE MOST NUMEROUS EAST OF THE LARAMIE RANGE AND IN THE MOUNTAINS. THIS WILL RESULT IN A CHANCE OF LATE DAY THUNDERSTORMS ACROSS THE AREA. ON SAT...THE BEST CHANCE FOR THUNDERSTORMS WILL BE NEAR THE CO BORDER. HIGH TEMPERATURES WILL BE AROUND NORMAL EACH DAY. AVIATION...12Z TAFS. BESIDES SOME PATCHY FOG AND LOW CEILING IN THE NEB PANHANDLE THIS MORNING...VFR CONDITIONS EXPECTED. FIRE WEATHER...HUMIDTIES WILL TREND HIGHER TODAY AND INTO EARLY NEXT WEEK AS UPSLOPE FLOW AND SOME SUBTROPICAL MOISTURE PUSH INTO THE FORECAST AREA. HOWEVER...DAYTIME MIN HUMIDITIES WILL REMAIN BELOW 15 PERCENT WEST OF THE LARAMIE RANGE WITH DRY CONDITIONS SUNDAY AND MONDAY AFTERNOON. EXPECT FIRE WEATHER CONCERNS TO LOWER INTO EARLY NEXT WEEK AS THIS SUBTROPICAL MOISTURE RETURNS TO THE AREA. IN ADDITION...SHOWERS AND TSTORMS WILL BECOME MORE NUMEROUS THROUGH NEXT WEEK. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...NONE. NE...NONE. && SHORT TERM...REC LONG TERM/AVIATION...SLA
Hazardous weather outlook, Jul 24, 5:10 AM MDT, 10 hours 6 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 510 AM MDT SUN JUL 24 2011 NEZ002-003-019>021-054-055-095-096-WYZ101>119-251115- DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE- NORTH SIOUX-SOUTH SIOUX-CONVERSE COUNTY LOWER ELEVATIONS- NIOBRARA COUNTY-NORTH LARAMIE RANGE- FERRIS/SEMINOE/SHIRLEY MOUNTAINS-SHIRLEY BASIN- CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY- EAST PLATTE COUNTY-GOSHEN COUNTY-CENTRAL CARBON COUNTY- NORTH SNOWY RANGE FOOTHILLS-SOUTHWEST CARBON COUNTY- SIERRA MADRE RANGE-UPPER NORTH PLATTE RIVER BASIN-SNOWY RANGE- LARAMIE VALLEY-SOUTH LARAMIE RANGE-SOUTH LARAMIE RANGE FOOTHILLS- CENTRAL LARAMIE COUNTY-EAST LARAMIE COUNTY- 510 AM MDT SUN JUL 24 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA PANHANDLE...EAST CENTRAL WYOMING...SOUTH CENTRAL WYOMING AND SOUTHEAST WYOMING. .DAY ONE...TODAY AND TONIGHT PATCHY FOG WILL OCCUR IN THE NEBRASKA PANHANDLE THROUGH LATE MORNING. SCATTERED THUNDERSTORMS WILL OCCUR THIS AFTERNOON AND EVENING ACROSS THE AREA. THE MOST NUMEROUS STORMS WILL BE EAST OF THE LARAMIE RANGE. THE STORMS ARE NOT EXPECTED TO BE SEVERE. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THERE IS A CHANCE OF LATE DAY THUNDERSTORMS ACROSS THE AREA EACH DAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED FOR THIS AFTERNOON OR TONIGHT. && THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT... HTTP://WEATHER.GOV/CHEYENNE
In the hours before
Special weather statement, Jul 24, 3:07 PM MDT, 9 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 307 PM MDT SUN JUL 24 2011 WYZ118-119-242145- CENTRAL LARAMIE COUNTY WY-EAST LARAMIE COUNTY WY- 307 PM MDT SUN JUL 24 2011 ...SIGNIFICANT WEATHER ADVISORY FOR EASTERN LARAMIE COUNTY UNTIL 345 PM MDT... AT 302 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR GUN BARREL...OR 28 MILES NORTHEAST OF CHEYENNE...MOVING SOUTH AT 5 MPH. HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING. THIS STORM WILL BE NEAR... RURAL EASTERN LARAMIE COUNTY THROUGH 345 PM MDT IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED ROADWAY. RUBIN
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 24, 3:55 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 65 min |
| Jul 24, 4:51 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 32 min |
| Jul 24, 5:49 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 56 min |
| Jul 24, 5:52 PM MDT | Flash Flood Warning | CYS | Laramie | 3 hr |
Nearby
Severe Thunderstorm Warnings in Wyoming, 2011Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.