Alert archive / Nebraska / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 97, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 30, 2011, 5:15 PM MDT for Cheyenne County, Morrill County, Nebraska. It was in force for 17 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jun 30, 2011, 5:15 PM MDT (23:15 UTC)
- Expired
- Jun 30, 2011, 5:32 PM MDT
- In force
- 17 min
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Cheyenne County, NE, Morrill County, NE
The radar
The Cheyenne radar (KCYS), 182 km from the middle of the area, began a volume at 23:15 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.
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
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 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, 12:18 PM MDT | Severe Thunderstorm Watch | SPC | 9 hr |
The nearest sounding before it
N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.3 hours before the alert went out and 178 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
- 843 J/kg
- Mixed-layer CIN
- -611 J/kg
- Mixed-layer LCL
- 2607 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 175 m²/s²
- 0-3 km storm-relative helicity
- 160 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
282
WUUS55 KCYS 302315
SVRCYS
NEC033-123-302345-
/O.NEW.KCYS.SV.W.0097.110630T2315Z-110630T2345Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
515 PM MDT THU JUN 30 2011
THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHEASTERN CHEYENNE COUNTY IN THE PANHANDLE OF NEBRASKA...
SOUTHEASTERN MORRILL COUNTY IN THE PANHANDLE OF NEBRASKA...
* UNTIL 545 PM MDT
* AT 510 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
OF 60 MPH. THIS STORM WAS LOCATED 10 MILES SOUTHWEST OF LISCO...OR
21 MILES NORTHEAST OF SIDNEY...AND MOVING NORTHEAST AT 45 MPH.
PENNY SIZE HAIL MAY ALSO ACCOMPANY THESE DAMAGING WINDS.
* LOCATIONS IMPACTED INCLUDE...
MAINLY RURAL AREAS OF EXTREME NORTHEASTERN CHEYENNE AND
SOUTHEASTERN MORRILL COUNTIES.
THIS WARNING REPLACES THE EARLIER SEVERE THUNDERSTORM WARNING IN
EFFECT FOR WESTERN AND CENTRAL CHEYENNE COUNTY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.
&&
LAT...LON 4130 10272 4145 10290 4174 10265 4174 10263
4165 10262 4140 10262 4139 10260 4137 10260
TIME...MOT...LOC 2314Z 222DEG 40KT 4144 10272
WIND...HAIL 60MPH 0.75IN
$$
HAHN1 follow-up statement
723
WWUS55 KCYS 302332
SVSCYS
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
532 PM MDT THU JUN 30 2011
NEC033-123-302342-
/O.CAN.KCYS.SV.W.0097.000000T0000Z-110630T2345Z/
CHEYENNE NE-MORRILL NE-
532 PM MDT THU JUN 30 2011
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MORRILL AND
NORTHEASTERN CHEYENNE COUNTIES IS CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.
ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 9 PM MDT.
LAT...LON 4130 10272 4145 10290 4174 10265 4174 10263
4165 10262 4140 10262 4139 10260 4137 10260
TIME...MOT...LOC 2332Z 222DEG 40KT 4159 10254
$$
HAHNWhat 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 Jun 30, 2:06 PM MDT, 3 hours 9 minutes earlier.
Area forecast discussion, Jun 30, 2:06 PM MDT, 3 hours 9 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHEYENNE WY 206 PM THU JUN 30 2011 .SHORT TERM...TONIGHT THROUGH SATURDAY... THUNDERSTORMS CONTINUE TO DEVELOP EARLY THIS AFTERNOON OVER THE SOUTHEAST PART OF WYOMING AND NORTHERN COLORADO. MANY OF THE STORMS WILL BECOME STRONG OR SEVERE THROUGH THE REST OF THE AFTERNOON AND EARLY TONIGHT AS THE ACTIVITY SPREAD EAST. MAIN THREAT FROM THE STORMS WILL BE STRONG WIND GUSTS...LARGE HAIL AND HEAVY RAINFALL. SO FAR TODAY TO THE WEST OF THE LARAMIE RANGE...SMALL HAIL...WIND GUSTS TO 40 MPH AND A PERIOD OF HEAVY RAIN HAS BEEN NOTED. DEEPER MOISTURE...GREATER INSTABILITY AND LARGER CAPE VALUES ARE OVER THE EAST PART OF THE CWA. THAT IS WHERE THE POTENTIAL FOR LARGER HAIL EXISTS. ALL OF THE ACTIVITY IS AHEAD OF A POTENT SHORTWAVE TROUGH CURRENTLY OVER EXTREME EAST CENTRAL UTAH. THAT FEATURE WILL MOVE ACROSS THE CWA TONIGHT. AHEAD OF THE SHORTWAVE TROUGH IS A 250 MB JET SEGMENT WHICH HAS BEEN AIDING STORM DEVELOPMENT OVER SOUTHEAST WYOMING. MODELS DIFFER WITH THE TIMING OF THE SHORTWAVE TROUGH WITH THE NAM BEING MUCH SLOWER. AT THIS TIME WILL FOLLOW MORE CLOSELY THE 00Z ECMWF TIMING WHICH MOVES THE FEATURE JUST EAST OF THE CWA AT 12Z FRIDAY. SHOWERS AND THUNDERSTORMS WILL CONTINUE AHEAD OF THE SHORTWAVE TROUGH TONIGHT. LOW CLOUDS AND WILL BE POSSIBLE LATER TONIGHT AND THROUGH MID MORNING FRIDAY OVER THE NORTHERN PANHANDLE WHERE THE SURFACE DEW POINTS WILL BE HIGHEST. AN ASSOCIATED SURFACE COLD FRONT WILL MOVE ACROSS THE CWA TONIGHT AND IS PRECEEDED BY A PRE FRONTAL TROUGH. BEHIND THE FRONT FOR FRIDAY WILL BE COOLER AND MORE STABLE AIR AS SURFACE HIGH PRESSURE BUILDS OVER THE REGION. FOR SATURDAY THE FLOW ALOFT IS MORE WESTERLY WITH A WEAK SHORTWAVE TROUGH MOVING ACROSS THE CWA. THE SURFACE HIGH WILL BE OVER THE PLAINS WITH SOUTHEAST RETURN FLOW INCREASING THE LOW LEVEL MOISTURE. PRECIPITABLE WATER VALUES INCREASE TO AN INCH OVER THE PANHANDLE ON SATURDAY. WILL INCREASE POPS FOR SATURDAY OVER MAINLY THE EASTERN PART OF THE CWA AND WARM TEMPERATURES. SPC HAS PLACED THE RISK OVER SEVERE OVER A NARROW PART OF SOUTHEAST WYOMING SATURDAY AFTERNOON AND LOOKS REASONABLE AT THIS TIME. .LONG TERM... LINGERING CONVECTION EXPECTED TO END SATURDAY EVENING WITH MAINLY DRY WEATHER EXPECTED SUNDAY AND MONDAY AS UPPER HIGH BUILDS OVER THE CWA WITH ASSOCIATED HEIGHT RISES. TEMPERATURES QUITE WARM SUNDAY AND INDEPENDENCE DAY WITH MAXS AROUND 100 POSSIBLE OVER THE PANHANDLE...ESPECIALLY MONDAY. INCREASE IN MOISTURE THEN EXPECTED OVER THE REGION BY MIDWEEK WHICH WILL BRING SOME MINOR COOLING AS WELL AS AN INCREASE IN MAINLY LATE DAY CONVECTION...BEGINNING TUESDAY THEN SOMEWHAT MORE SO WEDNESDAY AND THURSDAY. && .AVIATION...00Z TAF ISSUANCE... MAINLY VFR CONDITIONS EXPECTED TONIGHT THROUGH FRIDAY OUTSIDE OF SCTD TSRAS TONIGHT WHERE BRIEF MVFR CIGS/VSBYS POSSIBLE. BRIEF GUSTY SFC WINDS ALSO POSSIBLE VCTY ANY CBS. && .FIRE WEATHER... THUNDERSTORMS WILL AFFECT MOST OF THE CWA THROUGH TONIGHT WITH WETTING RAIN LIKELY. BEHIND THE COLD FRONT FOR FRIDAY WILL BE COOLER TEMPERATURES...A MUCH LOWER CHANCE OF LATE DAY STORMS AND GUSTY NORTHWEST OR NORTH WINDS. TEMPERATURES THEN WARM FOR THE WEEKEND AND MINIMUM RELATIVE HUMIDITY VALUES OVER THE LOWER ELEVATIONS DROP TO BETWEEN 15 AND 30 PERCENT. SOME LATE DAY THUNDERSTORMS WILL AFFECT THE EAST PART OF THE CWA SATURDAY. MID AND UPPER LEVEL MOISTURE RETURNS TO THE CWA MONDAY AND PERSISTS THROUGH THE MID PART OF NEXT WEEK. THE ADDITIONAL MOISUTRE WILL HELP TO PRODUCE LATE DAY SHOWERS AND THUDNERSTORMS. A COLD FRONT WILL MOVE ACROSS THE CWA MONDAY AFTERNOON AND MONDAY EVENING. && .HYDROLOGY... FLOOD WARNINGS REMAIN IN EFFECT FOR SARATOGA...SINCLAIR...HENRY AND MITCHELL ALONG THE NORTH PLATTE RIVER AS WELL AS THE LARAMIE RIVER NEAR LARAMIE AND THE ENCAMPMENT RIVER AT ENCAMPMENT. RIVER LEVELS WILL REMAIN STEADY OR SLOWLY FALL THROUGH EARLY NEXT WEEK ALONG THE LOWER NORTH PLATTE RIVER...WITH DIURNAL RISES AND FALLS MIXED IN WITH A GENERAL DECREASING TREND FURTHER WEST. VERY WARM TEMPERATURES ARE FORECAST OVER THE WEEKEND AND EARLY NEXT WEEK WHICH WILL RESULT IN INCREASED MOUNTAIN SNOW MELT. HOWEVER...WITH MOST OF THE SNOW PACK BELOW 9500 FEET MSL IN THE MOUNTAINS ALREADY MELTED... DO NOT ANTICIPATE ANY SIGNIFICANT RISES THIS WEEK. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...NONE. NE...NONE. && WEILAND/EMANUEL
Hazardous weather outlook, Jun 30, 12:32 PM MDT, 4 hours 43 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 1232 PM MDT THU JUN 30 2011 WYZ101>119-011045- 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- 1232 PM MDT THU JUN 30 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL WYOMING... SOUTH CENTRAL WYOMING AND SOUTHEAST WYOMING. .DAY ONE...THIS AFTERNOON AND TONIGHT THUNDERSTORMS WILL CONTINUE TO DEVELOP AND MOVE TO THE NORTHEAST AND SPREAD OVER THE REST OF SOUTHEAST WYOMING BY MID AFTERNOON. SOME OF THE THUNDERSTORMS WILL PRODUCE HAIL TO ONE INCH IN DIAMETER...WIND GUSTS TO 60 MPH AND HEAVY RAINFALL. THE THUNDERSTORMS WILL END OVER SOUTHEAST WYOMING BY LATE THIS EVENING. A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 9 PM. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY ISOLATED STRONG STORMS MAY DEVELOP MAINLY NORTH OF A GLENDO TO TORRINGTON LINE ON FRIDAY. THERE IS ALSO A CHANCE OF THUNDERSTORMS ON SATURDAY AND EARLY NEXT WEEK. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND EVENING. && THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT... HTTP://WEATHER.GOV/CHEYENNE NEZ002-003-019>021-054-055-095-096-011045- DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE- NORTH SIOUX-SOUTH SIOUX- 1232 PM MDT THU JUN 30 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA PANHANDLE. .DAY ONE...THIS AFTERNOON AND TONIGHT SCATTERED THUNDERSTORMS MAY DEVELOP OR MOVE INTO THE NEBRASKA PANHANDLE BY LATE IN THE AFTERNOON. SOME OF THE STORMS MAY BECOME SEVERE WITH THE MAIN THREATS BEING WIND GUSTS TO 70 MPH...HAIL UP TO ONE AND ONE HALF INCHES IN DIAMETER AND HEAVY RAIN. THE STORMS WILL WEAKEN AND MOVE EAST OF THE PANHANDLE SHORTLY AFTER MIDNIGHT. A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR THE WESTERN NEBRASKA PANHANDLE UNTIL 9 PM. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY ISOLATED STRONG STORMS MAY DEVELOP MAINLY NORTH OF A TORRINGTON TO ALLIANCE LINE ON FRIDAY. THERE IS ALSO A CHANCE OF THUNDERSTORMS ON SATURDAY AND EARLY NEXT WEEK. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED LATE THIS AFTERNOON AND TONIGHT. && THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT... HTTP://WEATHER.GOV/CHEYENNE WEILAND
In the hours before
Local storm report, Jun 30, 4:41 PM MDT, 34 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
441 PM MDT THU JUN 30 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0439 PM HAIL SIDNEY 41.13N 102.97W
06/30/2011 E0.25 INCH CHEYENNE NE TRAINED SPOTTER
HVY RAIN STRNG WNDS.
&&
BCHAPMANLocal storm report, Jun 30, 4:50 PM MDT, 25 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
450 PM MDT THU JUN 30 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0442 PM TSTM WND GST 2 SSW SIDNEY 41.10N 102.98W
06/30/2011 M60 MPH CHEYENNE NE ASOS
SIDNEY AIRPORT.
&&
MJAMSKILocal storm report, Jun 30, 4:55 PM MDT, 20 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
455 PM MDT THU JUN 30 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0445 PM HAIL SIDNEY 41.13N 102.97W
06/30/2011 E0.50 INCH CHEYENNE NE LAW ENFORCEMENT
&&
BCHAPMANLocal storm report, Jun 30, 5:06 PM MDT, 9 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
506 PM MDT THU JUN 30 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0500 PM TSTM WND GST 4 N WHEATLAND 42.11N 104.96W
06/30/2011 E60 MPH PLATTE WY CO-OP OBSERVER
HVY RAIN.
&&
BCHAPMANSpecial weather statement, Jun 30, 5:10 PM MDT, 5 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 510 PM MDT THU JUN 30 2011 WYZ106-107-010100- CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY- EAST PLATTE COUNTY- INCLUDING THE CITIES OF...BORDEAUX...GLENDO...WHEATLAND... CHUGWATER...GUERNSEY 510 PM MDT THU JUN 30 2011 ...GUSTY OUTFLOW WINDS TO CONTINUE ACROSS PLATTE COUNTY THROUGH 7 PM... A BAND OF COLLAPSING SHOWERS WILL CONTINUE TO PRODUCE WIND GUSTS TO NEAR 55 MPH TROUGH 7 PM. LOCALLY HIGHER WIND GUSTS WILL BE POSSIBLE. THESE STRONG AND ERRATIC WINDS WILL EFFECT INTERSTATE 25 THROUGH PLATTE COUNTY. MOTORISTS IN HIGH PROFILE VEHICLES TRAVELLING THROUGH THIS AREA SHOULD BE PREPARED TO ENCOUNTER THESE STRONG WINDS THIS EVENING. HAHN
Local storm report, Jun 30, 5:12 PM MDT, 3 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
512 PM MDT THU JUN 30 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0415 PM HAIL CHADRON 42.83N 103.00W
06/30/2011 M1.00 INCH DAWES NE TRAINED SPOTTER
&&
BCHAPMANThe office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 29, 7:16 PM MDT | Severe Thunderstorm Warning | CYS | Cheyenne, Morrill | 29 min |
| Jun 30, 2:03 PM MDT | Severe Thunderstorm Warning | CYS | Sioux | 24 min |
| Jun 30, 3:58 PM MDT | Severe Thunderstorm Warning | CYS | Banner, Kimball | 47 min |
| Jun 30, 4:01 PM MDT | Severe Thunderstorm Warning | CYS | Dawes | 29 min |
| Jun 30, 4:24 PM MDT | Severe Thunderstorm Warning | CYS | Cheyenne | 53 min |
Nearby
Severe Thunderstorm Warnings in Nebraska, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.