Alert archive / Nebraska / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 32, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at May 18, 2018, 12:23 AM MDT for Cheyenne County, Nebraska. It was in force for 52 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
- May 18, 2018, 12:23 AM MDT (06:23 UTC)
- Expired
- May 18, 2018, 1:15 AM MDT
- In force
- 52 min
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 60.0 mph
County Cheyenne County, NE
The radar
The Cheyenne radar (KCYS), 130 km from the middle of the area, began a volume at 06:25 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.
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 nearest sounding before it
Denver, CO (KDEN), launched 00:00Z, 6.4 hours before the alert went out and 146 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
- 423 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 3826 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 24 m²/s²
- 0-3 km storm-relative helicity
- 84 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.9
The text
As transmitted.
696
WUUS55 KCYS 180623
SVRCYS
NEC033-180715-
/O.NEW.KCYS.SV.W.0032.180518T0623Z-180518T0715Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
1223 AM MDT FRI MAY 18 2018
The National Weather Service in Cheyenne has issued a
* Severe Thunderstorm Warning for...
Southwestern Cheyenne County in the Panhandle of Nebraska...
* Until 115 AM MDT
* At 1223 AM MDT, a severe thunderstorm was located over Potter, or
18 miles west of Sidney, moving east at 20 mph.
HAZARD...60 mph wind gusts and half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Locations impacted include...
Potter and Brownson.
This includes Interstate 80 in Nebraska between mile markers 36 and
54.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4108 10337 4123 10338 4129 10335 4130 10321
4127 10298 4104 10309
TIME...MOT...LOC 0623Z 286DEG 19KT 4119 10331
HAIL...1.25IN
WIND...60MPH
$$
Allen2 follow-up statements
525
WWUS55 KCYS 180643
SVSCYS
Severe Weather Statement
National Weather Service Cheyenne WY
1243 AM MDT FRI MAY 18 2018
NEC033-180715-
/O.CON.KCYS.SV.W.0032.000000T0000Z-180518T0715Z/
Cheyenne NE-
1243 AM MDT FRI MAY 18 2018
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 115 AM MDT
FOR SOUTHWESTERN CHEYENNE COUNTY...
At 1243 AM MDT, a severe thunderstorm was located near south
of Potter, or 18 miles west of Sidney, moving southeast at 10 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Potter.
This includes Interstate 80 in Nebraska between mile markers 36 and
51.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4108 10337 4123 10338 4126 10330 4125 10319
4116 10309 4105 10317
TIME...MOT...LOC 0643Z 296DEG 9KT 4114 10332
HAIL...1.00IN
WIND...60MPH
$$
Allen167
WWUS55 KCYS 180714
SVSCYS
Severe Weather Statement
National Weather Service Cheyenne WY
114 AM MDT FRI MAY 18 2018
NEC033-180724-
/O.EXP.KCYS.SV.W.0032.000000T0000Z-180518T0715Z/
Cheyenne NE-
114 AM MDT FRI MAY 18 2018
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN CHEYENNE COUNTY
WILL EXPIRE AT 115 AM MDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore the warning will be allowed to expire. However heavy rain
is still possible with this thunderstorm.
LAT...LON 4108 10337 4123 10338 4126 10330 4125 10319
4116 10309 4105 10317
TIME...MOT...LOC 0714Z 286DEG 19KT 4110 10312
$$
AllenWhat 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 May 17, 10:42 PM MDT, 1 hour 41 minutes earlier.
Area forecast discussion, May 17, 10:42 PM MDT, 1 hour 41 minutes before
Area Forecast Discussion National Weather Service Cheyenne WY 1042 PM MDT Thu May 17 2018 .UPDATE... Issued at 515 PM MDT Thu May 17 2018 Severe Thunderstorm Watch has been issued for western Nebraska until 1100 PM tonight. Activity is rapidly developing at this hour and will continue to strengthen and push east into Cheyenne county, Morrill, and Box Butte counties. Updates have been sent. && .SHORT TERM...(This evening through Friday) Issued at 1248 PM MDT Thu May 17 2018 Latest surface analysis was showing the dry line about 10 miles west of Cheyenne. Through the morning the dewpoints have been 50 to 55 in Cheyenne with lower 40 degree dewpoints about 10 miles. Latest radar loop was showing elevated convection trying to develop around Horse Creek, but the cap is still pretty evident over this area based on the visible satellite loop. Meanwhile, Niobrara county is showing a bit more enhancement. LAPS data is showing very limited CINH over the area, so it probably will be another 1 to 2 hours before we start to see this convection become more prevalent. CAPES are very high especially over the panhandle where capes are running 3000-4000 j/kg with marginal effective shear around 30kts. This is sufficient instability to create supercells with large hail up to baseball size along with damaging downburst winds. The tornado threat cannot be ruled out, but the bulk of shear is in the mid layers. These supercells should begin to shift east this evening and evolve into clusters which will increase the threat for damaging winds. Things should begin to settle down towards midnight. The next round of convection is expected to develop once again Friday afternoon. This convection looks to have more effective shear with values around 40kts, but the instability is not expected to be as high as today. The severe convection will also most likely not linger much beyond the early part of the evening as the cold front dives south through the area. However, we may be faced with heavy rainfall/minor flooding potential along and behind the front through Saturday morning with 1 to 2 inches of rainfall possible. This is all in response to the mid/upper level low developing over northeast Colorado which will advect plenty of moisture into areas east of the Laramie Range along with good upslope flow. .LONG TERM...(Friday night through Thursday) Issued at 1248 PM MDT Thu May 17 2018 Upper trough situated over the central high plains Saturday night will progress slowly east-northeast toward the Upper Midwest through Sunday. Showers will gradually diminish Saturday night and Sunday morning along and east of I-25. Scattered showers/isolated tstorms will redevelop along and west of the Laramie Range Sunday afternoon with the passage of a weak disturbance in the SW flow aloft. High temperatures Sunday will be 10 degrees warmer compared to Saturday. For the Monday through Wednesday period, weak diffluent south- southwest flow aloft prevails as a upper low meanders over the Great Basin. Weak disturbances will periodically track across the CWA, producing isolated to scattered convection each day. Above normal temperatures are expected with highs in the 70s lower elevations. && .AVIATION...(For the 06Z TAFS through 06Z Friday night) Issued at 1035 PM MDT Thu May 17 2018 Wyoming TAFS...Becoming IFR at Cheyenne at 09Z, then MVFR until 18Z with isolated thunderstorms until 01Z, then IFR in rain and fog. Becoming MVFR at Laramie around 09Z, then VFR at 14Z, then MVFR at 18Z, then IFR at 01Z. VFR at Rawlins with thunderstorms nearby from 18Z to 01Z, and then IFR after 01Z in rain and fog. Nebraska TAFS...Becoming IFR and MVFR at 09Z at Chadron and Alliance, then VFR at 15Z, then IFR again after 01Z. Becoming IFR at Scottsbluff after 09Z, then MVFR after 15Z, then VFR after 19Z with isolated thunderstorms and localized MVFR until 00Z, then IFR after 00Z. Becoming IFR after 09Z at Sidney, then VFR after 15Z, with localized MVFR from 20Z to 00Z in thunderstorms, then IFR after 01Z. && .FIRE WEATHER... Issued at 150 PM MDT Thu May 17 2018 No major fire weather concerns during the next few days, due to greenup and persist chances of showers and thunderstorms through the period. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...None. NE...None. && UPDATE...TJT SHORT TERM...REC LONG TERM...REC AVIATION...RUBIN FIRE WEATHER...REC
Hazardous weather outlook, May 17, 5:12 PM MDT, 7 hours 11 minutes before
Hazardous Weather Outlook National Weather Service Cheyenne WY 512 PM MDT Thu May 17 2018 WYZ101>119-182315- 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- 512 PM MDT Thu May 17 2018 This hazardous weather outlook is for southeast Wyoming. .DAY ONE...TONIGHT Widely scattered thunderstorms are expected through this evening, mainly east of Interstate 25. A few thunderstorms may become strong with hail and strong gusty winds. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY Widespread showers and isolated non-severe thunderstorms are forecast Friday night and Saturday. Colder air on the backside of a low pressure system over eastern Colorado will drive snow levels down to around 9000 feet. Several inches of wet snow are possible over the higher elevations of the Snowy Range, with lesser accumulations for the Sierra Madre and north Laramie ranges. Widely scattered mainly afternoon and evening thunderstorms will be possible Sunday through Wednesday. Severe weather is not expected. .Spotter information statement... Spotter activation will not be required at this time. NEZ002-003-019>021-054-055-095-096-182315- Dawes-Box Butte-Scotts Bluff-Banner-Morrill-Kimball-Cheyenne- North Sioux-South Sioux- 512 PM MDT Thu May 17 2018 This hazardous weather outlook is for the western Nebraska Panhandle. .DAY ONE...LATE THIS AFTERNOON AND TONIGHT A Severe Thunderstorms Watch is in effect until 11 PM tonight. A line of thunderstorms will develop near the Wyoming border over the next hour or so and then move eastward through late this evening. The primary threats will be large hail and damaging wind gusts up to 70 mph, as well as locally heavy rainfall and frequent cloud to ground lightning. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY A cold front will move through the area Friday afternoon, with scattered thunderstorms expected. Some of the storms will be strong to severe with hail to ping pong ball size, wind gusts to 60 mph, and locally heavy rain. The greatest threat will be east and south of a line from Cheyenne to Torrington to Alliance. Widespread showers and isolated non-severe thunderstorms are forecast Friday night and Saturday. Widely scattered mainly afternoon and evening thunderstorms will be possible Sunday through Wednesday. Severe weather is not expected. .Spotter information statement... Spotters are urged to report severe weather to the National Weather Service.
In the hours before
Special weather statement, May 17, 9:05 PM MDT, 3 hours 18 minutes before
Special Weather Statement National Weather Service Cheyenne WY 905 PM MDT THU MAY 17 2018 NEZ020-021-054-055-180400- Kimball NE-Cheyenne NE-Morrill NE-Banner NE- 905 PM MDT THU MAY 17 2018 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN CHEYENNE... NORTHEASTERN KIMBALL...SOUTHWESTERN MORRILL AND SOUTHEASTERN BANNER COUNTIES UNTIL 1000 PM MDT... At 905 PM MDT, Doppler radar was tracking strong thunderstorms along a line extending from 10 miles west of Gurley to 7 miles southwest of Dix. Movement was northeast at 25 mph. Dime size hail and wind gusts of 50 to 55 mph will be possible with these storms. Strong thunderstorms will be near... Dalton around 930 PM MDT. Potter around 935 PM MDT. The Intersection Of Highway 385 And 92 around 955 PM MDT. This includes Interstate 80 in Nebraska between mile markers 29 and 44. A severe thunderstorm watch remains in effect until 1100 PM MDT for the Panhandle of Nebraska. LAT...LON 4168 10282 4157 10326 4110 10360 4124 10305 TIME...MOT...LOC 0305Z 220DEG 20KT 4136 10317 4114 10354 Rubin
Special weather statement, May 17, 9:40 PM MDT, 2 hours 43 minutes before
Special Weather Statement
National Weather Service Cheyenne WY
940 PM MDT THU MAY 17 2018
NEZ021-055-180445-
Cheyenne NE-Morrill NE-
940 PM MDT THU MAY 17 2018
...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN CHEYENNE AND
SOUTHEASTERN MORRILL COUNTIES UNTIL 1045 PM MDT...
At 940 PM MDT, Doppler radar was tracking a strong thunderstorm 7
miles east of Gurley, or 14 miles northeast of Sidney, moving
northeast at 50 mph.
Nickel size hail and wind gusts of 50 to 55 mph will be possible with
this storm.
This storm will remain over mainly rural areas of northeastern
Cheyenne and southeastern Morrill Counties.
A severe thunderstorm watch remains in effect until 1100 PM MDT for
the Panhandle of Nebraska.
LAT...LON 4123 10277 4130 10297 4174 10266 4174 10264
4140 10263 4139 10261 4137 10261
TIME...MOT...LOC 0340Z 205DEG 45KT 4132 10283
RubinLocal storm report, May 17, 9:50 PM MDT, 2 hours 33 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
950 PM MDT THU MAY 17 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0918 PM HAIL 5 N SIDNEY 41.21N 102.97W
05/17/2018 E2.50 INCH CHEYENNE NE PUBLIC
REPORT SENT VIA SOCIAL MEDIA
&&
TTRUDELLocal storm report, May 17, 10:22 PM MDT, 2 hours 1 minute before
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE CHEYENNE WY
1022 PM MDT THU MAY 17 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0649 PM TSTM WND GST 2 S SIDNEY 41.10N 102.97W
05/17/2018 M66.00 MPH CHEYENNE NE ASOS
0658 PM HAIL 15 NNE CRAWFORD 42.89N 103.30W
05/17/2018 E1.00 INCH DAWES NE TRAINED SPOTTER
0709 PM TSTM WND GST 5 SE ALLIANCE 42.05N 102.81W
05/17/2018 M56.00 MPH BOX BUTTE NE ASOS
0726 PM HAIL CHADRON 42.83N 103.00W
05/17/2018 E1.00 INCH DAWES NE LAW ENFORCEMENT
0738 PM TSTM WND DMG ALLIANCE 42.10N 102.87W
05/17/2018 BOX BUTTE NE LAW ENFORCEMENT
POWER OUTAGES AND UPROOTED TREES REPORTED IN ALLIANCE.
PEAK GUST AT ALLIANCE AIRPORT WAS 56 MPH.
0836 PM HAIL 4 W SIDNEY 41.13N 103.05W
05/17/2018 M1.00 INCH CHEYENNE NE TRAINED SPOTTER
0845 PM HAIL 3 W SIDNEY 41.13N 103.03W
05/17/2018 M2.00 INCH CHEYENNE NE TRAINED SPOTTER
REPORTED ON INTERSTATE 80 AT THE REST AREA WEST OF SIDNEY
NEBRASKA.
0848 PM HAIL SIDNEY 41.13N 102.97W
05/17/2018 E1.00 INCH CHEYENNE NE TRAINED SPOTTER
0849 PM HAIL SIDNEY 41.13N 102.97W
05/17/2018 E1.00 INCH CHEYENNE NE PUBLIC
MOST WERE PEA TO DIME SIZE. A FEW QUARTER SIZE.
0856 PM HAIL 3 NW SIDNEY 41.16N 103.01W
05/17/2018 M2.50 INCH CHEYENNE NE STORM CHASER
0918 PM HAIL 5 N SIDNEY 41.21N 102.97W
05/17/2018 E2.50 INCH CHEYENNE NE PUBLIC
REPORT SENT VIA SOCIAL MEDIA
&&
TTRUDELSpecial weather statement, May 17, 11:09 PM MDT, 1 hour 14 minutes before
Special Weather Statement National Weather Service Cheyenne WY 1109 PM MDT THU MAY 17 2018 NEZ020-021-054-055-180600- Kimball NE-Cheyenne NE-Morrill NE-Banner NE- 1109 PM MDT THU MAY 17 2018 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN CHEYENNE... NORTHEASTERN KIMBALL...SOUTHWESTERN MORRILL AND EASTERN BANNER COUNTIES UNTIL MIDNIGHT MDT... At 1108 PM MDT, Doppler radar was tracking a strong thunderstorm near Kimball, moving northeast at 25 mph. Nickel size hail and wind gusts of 50 to 55 mph will be possible with this storm. This storm will remain over mainly rural areas of northwestern Cheyenne...northeastern Kimball...southwestern Morrill and eastern Banner Counties, including the following locations: Bushnell. This includes Interstate 80 in Nebraska between mile markers 9 and 14. LAT...LON 4116 10389 4154 10390 4176 10315 4137 10312 TIME...MOT...LOC 0508Z 245DEG 21KT 4132 10370 Rubin
Special weather statement, May 17, 11:29 PM MDT, 54 minutes before
Special Weather Statement National Weather Service Cheyenne WY 1129 PM MDT THU MAY 17 2018 NEZ021-055-180630- Cheyenne NE-Morrill NE- 1129 PM MDT THU MAY 17 2018 ...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL CHEYENNE AND SOUTHEASTERN MORRILL COUNTIES UNTIL 1230 AM MDT... At 1129 PM MDT, Doppler radar was tracking a strong thunderstorm 7 miles west of Gurley, or 15 miles northwest of Sidney, moving north at 20 mph. Nickel size hail and wind gusts of 50 to 55 mph will be possible with this storm. This strong thunderstorm will be near... Dalton around 1155 PM MDT. Court House And Jail Rocks around 1225 AM MDT. LAT...LON 4126 10307 4128 10320 4164 10321 4154 10274 TIME...MOT...LOC 0529Z 198DEG 16KT 4133 10312 Rubin
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 17, 6:14 PM MDT | Special Weather Statement | CYS | Scotts Bluff | 61 min |
| May 17, 6:23 PM MDT | Special Weather Statement | CYS | Dawes | 67 min |
| May 17, 6:36 PM MDT | Special Weather Statement | CYS | Box Butte | 54 min |
| May 17, 6:41 PM MDT | Severe Thunderstorm Warning | CYS | Dawes | 51 min |
| May 17, 6:42 PM MDT | Severe Thunderstorm Warning | CYS | Cheyenne, Morrill | 48 min |
| May 17, 7:15 PM MDT | Severe Thunderstorm Warning | CYS | Box Butte, Dawes | 37 min |
| May 17, 7:25 PM MDT | Severe Thunderstorm Warning | CYS | Dawes | 24 min |
| May 17, 7:52 PM MDT | Special Weather Statement | CYS | Cheyenne | 23 min |
| May 17, 8:03 PM MDT | Severe Thunderstorm Warning | CYS | Cheyenne | 42 min |
| May 17, 8:42 PM MDT | Severe Thunderstorm Warning | CYS | Cheyenne | 48 min |
| May 17, 9:05 PM MDT | Special Weather Statement | CYS | Cheyenne | 55 min |
| May 17, 9:26 PM MDT | Severe Thunderstorm Warning | CYS | Banner, Cheyenne, Kimball, Morrill | 64 min |
| May 17, 9:40 PM MDT | Special Weather Statement | CYS | Morrill | 65 min |
| May 17, 9:52 PM MDT | Severe Thunderstorm Warning | CYS | Cheyenne, Morrill | 40 min |
| May 17, 10:08 PM MDT | Areal Flood Advisory | CYS | Cheyenne, Kimball | 10 hr |
| May 17, 10:28 PM MDT | Severe Thunderstorm Warning | CYS | Cheyenne, Morrill | 62 min |
| May 17, 11:09 PM MDT | Special Weather Statement | CYS | Banner | 51 min |
| May 17, 11:22 PM MDT | Severe Thunderstorm Warning | CYS | Banner, Cheyenne, Kimball, Morrill | 53 min |
| May 17, 11:29 PM MDT | Special Weather Statement | CYS | Cheyenne | 61 min |
| May 18, 3:50 AM MDT | Flood Watch | CYS | Banner, Cheyenne, Kimball, Morrill, Scotts Bluff | 38 hr |
| May 18, 5:48 PM MDT | Special Weather Statement | CYS | Sioux | 57 min |
Nearby
Severe Thunderstorm Warnings in Nebraska, 2018Every severe thunderstorm warning in 2018
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.