Alert archive / Nebraska / Special Weather Statements in 2012
Special Weather Statement, NWS Cheyenne, WY
NWS Cheyenne, WY issued this special weather statement at Jul 21, 2012, 5:29 PM MDT for Sioux County, Nebraska. It was in force for 61 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
- Jul 21, 2012, 5:29 PM MDT (23:29 UTC)
- Expired
- Jul 21, 2012, 6:30 PM MDT
- In force
- 61 min
- Issued by
- NWS Cheyenne, WY
County Sioux County, NE
The radar
The Rapid City radar (KUDX), 177 km from the middle of the area, began a volume at 23:28 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 (KDNR), launched 12:00Z, 11.5 hours before the alert went out and 323 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
- 3 J/kg
- Mixed-layer CIN
- -475 J/kg
- Mixed-layer LCL
- 2634 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 24 m²/s²
- 0-3 km storm-relative helicity
- 36 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>What forecasters said that day
The local office's own words before this special weather statement 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 special weather statement went out at Jul 21, 4:43 PM MDT, 46 minutes earlier.
Area forecast discussion, Jul 21, 4:43 PM MDT, 46 minutes before
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</html>Hazardous weather outlook, Jul 21, 4:52 PM MDT, 37 minutes before
HAZARDOUS WEATHER OUTLOOK...CORRECTED NATIONAL WEATHER SERVICE CHEYENNE WY 452 PM MDT SAT JUL 21 2012 WYZ101>119-221245- 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- 452 PM MDT SAT JUL 21 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST WYOMING. .DAY ONE...TONIGHT SCATTERED EVENING THUNDERSTORMS ARE POSSIBLE ACROSS THE AREA WITH GUSTY WINDS AND BRIEF HEAVY RAIN. A FEW STRONGER THUNDERSTORMS MAY CONTAIN SMALL HAIL. THE FREQUENT LIGHTNING FROM THESE STORMS MAY ALSO AID IN PRODUCING FIRES...DUE TO VERY DRY CONDITIONS. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY ISOLATED AFTERNOON AND EVENING THUNDERSTORMS WILL BE POSSIBLE EACH DAY AS MONSOON MOISTURE CONTINUES ACROSS THE AREA. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT. && THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT... HTTP://WEATHER.GOV/CHEYENNE NEZ002-003-019>021-054-055-095-096-221245- DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE- NORTH SIOUX-SOUTH SIOUX- 452 PM MDT SAT JUL 21 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA PANHANDLE. .DAY ONE...TONIGHT ISOLATED EVENING THUNDERSTORMS ARE POSSIBLE MAINLY IN THE NORTHERN PANHANDLE. GUSTY WINDS AND BRIEF HEAVY RAIN WILL BE POSSIBLE. A FEW STRONGER THUNDERSTORMS MAY CONTAIN SMALL HAIL. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY ISOLATED AFTERNOON AND EVENING THUNDERSTORMS WILL BE POSSIBLE EACH DAY AS MONSOON MOISTURE CONTINUES ACROSS THE AREA. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT. && THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT... HTTP://WEATHER.GOV/CHEYENNE COX
In the hours before
Special weather statement, Jul 21, 4:47 PM MDT, 42 minutes before
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</html>Special weather statement, Jul 21, 5:05 PM MDT, 24 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
505 PM MDT SAT JUL 21 2012
WYZ107-108-116>119-220000-
CENTRAL LARAMIE COUNTY WY-EAST LARAMIE COUNTY WY-EAST PLATTE COUNTY
WY-GOSHEN COUNTY WY-SOUTH LARAMIE RANGE WY-SOUTH LARAMIE RANGE
FOOTHILLS WY-
505 PM MDT SAT JUL 21 2012
...THUNDERSTORM OUTFLOW BOUNDARY MOVING EASTWARD ACROSS LARAMIE
COUNTY...
AT 503 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A THUNDERSTORM OUTFLOW BOUNDARY ALONG A LINE EXTENDING
FROM 5 MILES SOUTHEAST OF CHUGWATER TO 6 MILES NORTH OF WHITAKER TO
7 MILES SOUTHWEST OF WHITAKER TO 6 MILES EAST OF FEDERAL TO CRYSTAL
LAKE CAMPGROUND TO 7 MILES NORTHEAST OF VIRGINIA DALE TO VIRGINIA
DALE...AND MOVING EAST AT 25 MPH.
WIND GUSTS UP TO 50 MPH ARE EXPECTED AS THIS OUTFLOW BOUNDARY PASSES
ACROSS YOUR LOCATION. ISOLATED THUNDERSTORMS WILL DEVELOP ALONG THE
OUTFLOW BOUNDARY AND MAY AFFECT THE FRONTIER DAYS PARK AND
FESTIVITIES IN CHEYENNE AROUND 530 PM MDT PRODUCING WIND GUSTS TO 50
MPH AND LIGHT RAIN.
THE OUTFLOW BOUNDARY WILL BE NEAR...
WHITAKER AROUND 505 PM MDT.
NORTH CHEYENNE AROUND 525 PM MDT.
WARREN AF BASE AROUND 530 PM MDT.
FRONTIER PARK AROUND 535 PM MDT.
CHEYENNE AROUND 540 PM MDT.
SOUTH GREELEY HIGHWAY AND FOX FARM-COLLEGE AROUND 545 PM MDT.
THIS INCLUDES INTERSTATE 80 IN WYOMING BETWEEN MILE MARKERS 341 AND
368.
THIS INCLUDES INTERSTATE 25 IN WYOMING BETWEEN MILE MARKERS 0 AND 9.
&&
LAT...LON 4100 10530 4114 10517 4124 10503 4133 10501
4150 10494 4175 10480 4178 10428 4136 10452
4123 10456 4113 10471 4099 10486 4099 10530
TIME...MOT...LOC 2259Z 270DEG 20KT 4171 10472 4150 10487
4134 10495 4124 10497 4115 10510 4101 10522
4089 10538
RUBINSpecial weather statement, Jul 21, 5:11 PM MDT, 18 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 511 PM MDT SAT JUL 21 2012 WYZ117-118-220015- CENTRAL LARAMIE COUNTY WY-SOUTH LARAMIE RANGE FOOTHILLS WY- 511 PM MDT SAT JUL 21 2012 ...SIGNIFICANT WEATHER ADVISORY FOR WESTERN LARAMIE COUNTY UNTIL 615 PM MDT... AT 510 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR WHITAKER...OR 16 MILES NORTH OF CHEYENNE... MOVING NORTHEAST AT 15 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 55 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH FREQUENT DANGEROUS LIGHTNING. THIS STORM WILL BE NEAR... WHITAKER AROUND 515 PM MDT. THIS INCLUDES INTERSTATE 25 IN WYOMING BETWEEN MILE MARKERS 13 AND 43. IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. && LAT...LON 4162 10490 4142 10439 4115 10486 4120 10517 TIME...MOT...LOC 2312Z 223DEG 12KT 4137 10487 RUBIN
Special weather statement, Jul 21, 5:14 PM MDT, 15 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 514 PM MDT SAT JUL 21 2012 WYZ106>108-220015- CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY WY-EAST PLATTE COUNTY WY-GOSHEN COUNTY WY- 514 PM MDT SAT JUL 21 2012 ...SIGNIFICANT WEATHER ADVISORY FOR EASTERN PLATTE AND WESTERN GOSHEN COUNTIES UNTIL 615 PM MDT... AT 505 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 5 MILES SOUTHEAST OF WHEATLAND...MOVING NORTHEAST AT 20 MPH. HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING. THIS STORM WILL BE NEAR... GRAYROCKS RESERVOIR AROUND 540 PM MDT. FORT LARAMIE NATIONAL HISTORIC SITE AROUND 615 PM MDT. IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. HEAVY RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED ROADWAY. && LAT...LON 4239 10465 4197 10438 4194 10490 4204 10495 TIME...MOT...LOC 2314Z 240DEG 16KT 4203 10482 RUBIN
Special weather statement, Jul 21, 5:29 PM MDT, 0 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 529 PM MDT SAT JUL 21 2012 NEZ095-096-WYZ102-108-220030- GOSHEN COUNTY WY-NIOBRARA COUNTY WY-NORTH SIOUX NE-SOUTH SIOUX NE- 529 PM MDT SAT JUL 21 2012 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL SIOUX...SOUTHEASTERN NIOBRARA AND EXTREME NORTHEASTERN GOSHEN COUNTIES UNTIL 630 PM MDT... AT 524 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 10 MILES WEST OF HARRISON...OR 21 MILES EAST OF LUSK...MOVING EAST AT 15 MPH. HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH FREQUENT DANGEROUS LIGHTNING. THIS STORM WILL TRACK EAST ALONG HIGHWAY 20 BETWEEN VAN TASSELL AND HARRISON THROUGH 615 PM MDT. THIS STORM WILL BE NEAR... HARRISON AROUND 605 PM MDT. IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. && LAT...LON 4294 10372 4241 10371 4261 10416 4277 10417 TIME...MOT...LOC 2328Z 266DEG 12KT 4266 10405 RUBIN
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 3:09 PM MDT | Special Weather Statement | CYS | Niobrara | 66 min |
| Jul 21, 3:17 PM MDT | Special Weather Statement | CYS | Albany | 58 min |
| Jul 21, 3:31 PM MDT | Special Weather Statement | CYS | Albany | 59 min |
| Jul 21, 3:45 PM MDT | Special Weather Statement | CYS | Platte | 60 min |
| Jul 21, 3:51 PM MDT | Special Weather Statement | CYS | Albany | 54 min |
| Jul 21, 4:26 PM MDT | Special Weather Statement | CYS | Platte | 64 min |
| Jul 21, 4:30 PM MDT | Severe Thunderstorm Warning | CYS | Platte | 60 min |
| Jul 21, 4:47 PM MDT | Special Weather Statement | CYS | Platte | 58 min |
| Jul 21, 5:03 PM MDT | Special Weather Statement | CYS | Laramie | 57 min |
| Jul 21, 5:05 PM MDT | Special Weather Statement | CYS | Laramie | 55 min |
| Jul 21, 5:11 PM MDT | Special Weather Statement | CYS | Laramie | 64 min |
| Jul 21, 5:14 PM MDT | Special Weather Statement | CYS | Platte | 61 min |
| Jul 21, 5:54 PM MDT | Special Weather Statement | CYS | Goshen | 66 min |
Nearby
Special Weather Statements in Nebraska, 2012Every special weather statement in 2012
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.