Alert archive / Nebraska / Flash Flood Watches in 2019

Flash Flood Watch 3, NWS Cheyenne, WY

July 4, 2019Goshen County, Niobrara County, Wyoming; 6 counties in Nebraska

NWS Cheyenne, WY issued this flash flood watch at Jul 4, 2019, 3:12 AM MDT for Goshen County, Niobrara County, Wyoming; 6 counties in Nebraska. It took effect at Jul 4, 2019, 3:00 PM MDT. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued
Jul 4, 2019, 3:12 AM MDT (09:12 UTC)
In effect from
Jul 4, 2019, 3:00 PM MDT
Expired
Jul 4, 2019, 11:57 PM MDT
In force
9 hr
Issued by
NWS Cheyenne, WY
Flood severity
None

Counties Banner County, NE, Box Butte County, NE, Dawes County, NE, Morrill County, NE, Scotts Bluff County, NE, Sioux County, NE, Goshen County, WY, Niobrara County, WY

The radar

The Cheyenne radar (KCYS), 152 km from the middle of the area, began a volume at 09:15 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.

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 9.2 hours before the alert went out and 281 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.

Skew-T log-pSkew-T log-p diagram, N. Platte/Lee Bi, NE at 00:00Z on 2019-07-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1248 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, N. Platte/Lee Bi, NE at 00:00Z on 2019-07-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 1 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1248 J/kg
Mixed-layer CIN
-89 J/kg
Mixed-layer LCL
1925 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
1 m²/s²
0-3 km storm-relative helicity
29 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 flash flood watch went out at Jul 4, 2:43 AM MDT, 29 minutes earlier.

Area forecast discussion, Jul 4, 2:43 AM MDT, 29 minutes before
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Hazardous weather outlook, Jul 3, 2:36 PM MDT, 12 hours 36 minutes before
Hazardous Weather Outlook
National Weather Service Cheyenne WY
236 PM MDT Wed Jul 3 2019

WYZ103>106-109>117-042045-
North Laramie Range-Ferris/Seminoe/Shirley Mountains-
Shirley Basin-Central Laramie Range and Southwest Platte 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-
236 PM MDT Wed Jul 3 2019

This hazardous weather outlook is for portions of south central
Wyoming and southeast Wyoming.

.DAY ONE...THIS AFTERNOON AND TONIGHT

Widely scattered marginally severe thunderstorms are expected this
afternoon, mainly between noon and 8 PM MDT. Some storms will be
capable of producing strong winds, small hail and heavy rain.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

Chances for afternoon and evening thunderstorms will continue each
day, with strong to severe thunderstorms possible on the Fourth
of July and into the weekend.

.Spotter information statement...

Spotter activation will not be needed.

NEZ002-003-019>021-054-055-095-096-WYZ101-102-107-108-118-119-
042045-
Dawes-Box Butte-Scotts Bluff-Banner-Morrill-Kimball-Cheyenne-
North Sioux-South Sioux-Converse County Lower Elevations-
Niobrara County-East Platte County-Goshen County-
Central Laramie County-East Laramie County-
236 PM MDT Wed Jul 3 2019

This hazardous weather outlook is for portions of western
Nebraska...east central Wyoming and southeast Wyoming.

.DAY ONE...THIS AFTERNOON AND TONIGHT

Widely scattered severe thunderstorms will be focused mainly
east of the northern Laramie Range and continue to the north and
east of a Chugwater-LaGrange-Scottsbluff-Alliance line this
afternoon. Storms will move off the Laramie Range around noon MDT
and continue east, ending by about 8 PM MDT.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

Severe thunderstorms expected again on the 4th over a similar are,
but extending south to the Colorado border. Timing will be similar
to today's. Chances for afternoon and evening thunderstorms will
continue into the weekend.

.Spotter information statement...

Spotter activation may be needed this afternoon and early evening.

In the hours before

Special weather statement, Jul 3, 11:24 PM MDT, 3 hours 48 minutes before
Special Weather Statement
National Weather Service Cheyenne WY
1124 PM MDT Wed Jul 3 2019

NEZ021-055-040600-
Cheyenne NE-Morrill NE-
1124 PM MDT Wed Jul 3 2019

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN CHEYENNE AND
SOUTHEASTERN MORRILL COUNTIES UNTIL MIDNIGHT MDT...

At 1124 PM MDT, Doppler radar was tracking a strong thunderstorm 12
miles south of Lisco, or 17 miles west of Oshkosh, moving east at 25
mph.

Penny size hail and winds in excess of 40 mph will be possible with
this storm.

This storm will remain over mainly rural areas of northeastern
Cheyenne and southeastern Morrill Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4120 10280 4147 10283 4147 10264 4140 10263
      4139 10261 4120 10261
TIME...MOT...LOC 0524Z 266DEG 20KT 4133 10267

Trudel
Special weather statement, Jul 3, 11:49 PM MDT, 3 hours 23 minutes before
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Special weather statement, Jul 4, 12:25 AM MDT, 2 hours 47 minutes before
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Special weather statement, Jul 4, 12:30 AM MDT, 2 hours 42 minutes before
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Special weather statement, Jul 4, 12:39 AM MDT, 2 hours 33 minutes before
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Special weather statement, Jul 4, 1:23 AM MDT, 1 hour 49 minutes before
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The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 3, 6:29 PM MDTSpecial Weather StatementCYSLaramie46 min
Jul 3, 7:10 PM MDTSpecial Weather StatementCYSNiobrara50 min
Jul 3, 9:38 PM MDTSevere Thunderstorm WarningCYSConverse52 min
Jul 3, 10:13 PM MDTSevere Thunderstorm WarningCYSConverse, Niobrara47 min
Jul 3, 10:58 PM MDTSevere Thunderstorm WarningCYSNiobrara47 min
Jul 3, 11:12 PM MDTSpecial Weather StatementCYSConverse48 min
Jul 3, 11:21 PM MDTSevere Thunderstorm WarningCYSConverse24 min
Jul 3, 11:45 PM MDTSevere Thunderstorm WarningCYSConverse45 min
Jul 4, 12:25 AM MDTSpecial Weather StatementCYSNiobrara50 min
Jul 4, 1:23 AM MDTSpecial Weather StatementCYSNiobrara52 min
Jul 4, 6:30 AM MDTSpecial Weather StatementCYSConverse45 min
Jul 4, 3:06 PM MDTSpecial Weather StatementCYSLaramie54 min
Jul 4, 3:10 PM MDTSpecial Weather StatementCYSAlbany65 min
Jul 4, 3:19 PM MDTSpecial Weather StatementCYSConverse41 min
Jul 4, 3:21 PM MDTSevere Thunderstorm WarningCYSAlbany, Platte24 min
Jul 4, 3:37 PM MDTSevere Thunderstorm WarningCYSAlbany, Platte23 min
Jul 4, 3:54 PM MDTSevere Thunderstorm WarningCYSAlbany, Platte66 min
Jul 4, 3:55 PM MDTSpecial Weather StatementCYSConverse50 min
Jul 4, 4:01 PM MDTSpecial Weather StatementCYS44 min
Jul 4, 4:08 PM MDTSpecial Weather StatementCYSConverse52 min
Jul 4, 4:27 PM MDTSevere Thunderstorm WarningCYSCarbon21 min
Jul 4, 4:32 PM MDTTornado WarningCYSLaramie, Platte28 min
Jul 4, 4:49 PM MDTSpecial Weather StatementCYSConverse41 min
Jul 4, 4:57 PM MDTTornado WarningCYSPlatte48 min
Jul 4, 5:29 PM MDTSpecial Weather StatementCYSConverse46 min
Jul 4, 5:34 PM MDTSpecial Weather StatementCYSConverse41 min
Jul 4, 5:42 PM MDTSpecial Weather StatementCYSConverse48 min
Jul 4, 5:45 PM MDTSevere Thunderstorm WarningCYSConverse, Platte45 min
Jul 4, 5:47 PM MDTSpecial Weather StatementCYSGoshen43 min
Jul 4, 5:53 PM MDTSevere Thunderstorm WarningCYSGoshen, Laramie, Platte28 min
Jul 3, 6:12 PM MDTSpecial Weather StatementCYSBox Butte48 min
Jul 3, 6:25 PM MDTSevere Thunderstorm WarningCYSBox Butte, Morrill35 min
Jul 3, 7:00 PM MDTSpecial Weather StatementCYSBox Butte45 min
Jul 3, 8:30 PM MDTSpecial Weather StatementCYSKimball60 min
Jul 3, 9:32 PM MDTSpecial Weather StatementCYSSioux58 min
Jul 3, 9:58 PM MDTSevere Thunderstorm WarningCYSDawes32 min
Jul 3, 10:10 PM MDTSpecial Weather StatementCYSCheyenne50 min
Jul 3, 11:24 PM MDTSpecial Weather StatementCYSCheyenne36 min
Jul 4, 12:30 AM MDTSpecial Weather StatementCYSMorrill45 min
Jul 4, 12:39 AM MDTSpecial Weather StatementCYSDawes51 min
Jul 4, 12:35 PM MDTSpecial Weather StatementCYSScotts Bluff55 min

Nearby

Flash Flood Watches in Nebraska, 2019Flash Flood Watches in Wyoming, 2019Every flash flood watch in 2019

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.