Alert archive / Nebraska / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 117, NWS Cheyenne, WY

July 18, 2008Dawes County, Sioux County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 18, 2008, 6:30 PM MDT for Dawes County, Sioux County, Nebraska. It was in force for 60 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 18, 2008, 6:30 PM MDT (00:30 UTC)
Expired: Jul 18, 2008, 7:30 PM MDT
In force: 60 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon

Counties Dawes County, NE, Sioux County, NE

The radar

The Rapid City radar (KUDX), 176 km from the middle of the area, began a volume at 00:32 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 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 18, 3:05 PM MDT, 3 hours 25 minutes earlier.

Area forecast discussion, Jul 18, 3:05 PM MDT, 3 hours 25 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
305 PM MDT FRI JUL 18 2008

.SHORT TERM...TONIGHT THROUGH SUNDAY...STRONGER CONVECTION THIS
AFTERNOON HAS BEEN NORTH AND SOUTH OF CWA WITH BETTER UPPER
DYNAMICS.  PER LAPS DATA AND SPC DAY1 OUTLOOK THOUGH...POTENTIAL
STILL EXISTS FOR SOME STRONG STORMS ALONG AND EAST OF A LINE FROM
KDGW TO KIMBALL NEBRASKA INTO MID EVENING.  MUCH OF THAT AREA WAS
HINDERED A BIT BY COOL OUTFLOW AIR AND SUBSIDENCE BEHIND EARLY
MORNING CONVECTION.  BEST COVERAGE OF TSTMS SHOULD BE OVER THE
NORTHERN CWA...AND ANOTHER MCS IS HINTED AT BY THE MODELS OVER
NERN WY/WESTERN SD LATER TONIGHT.  ON SATURDAY...RISING UPPER
HEIGHTS AND WESTERLY FLOW ALOFT WILL PREVAIL.  HAVE KEPT FORECAST
DRY ON SATURDAY AS AIR MASS WILL BE DRIER/LESS UNSTABLE.  UPPER
HEIGHTS CONTINUE TO RISE SUNDAY WITH AN UPPER HIGH BUILDING
OVER CO.  SOME MOISTURE AND INSTABILITY WILL BE PRESENT OVER
AND NEAR THE MOUNTAINS SUNDAY AFTERNOON...SO A LOW POP THERE
LOOKS GOOD.  KEPT THE REST OF CWA DRY INTO SUNDAY AFTERNOON.

.LONG TERM...SUNDAY NIGHT THROUGH FRI...
AN UPPER RIDGE WILL BE LOCATED OVER OR JUST SOUTH OF THE FORECAST
AREA...AND WILL BE THE PRIMARY INFLUENCE ON THE WEATHER MON THROUGH
FRI. MID AND UPPER LEVEL MONSOONAL MOISTURE WILL DRIFT NORTHWARD AND
NORTHEASTWARD ON THE BACK SIDE OF THE UPPER RIDGE...BUT THE BEST
MOISTURE WILL REMAIN LARGELY TO OUR SOUTH. ENOUGH MOISTURE WILL MAKE
IT OVER THE FORECAST AREA TO WARRANT A CHANCE OF MAINLY AFTERNOON
AND EVENING THUNDERSTORMS ALMOST DAILY. TEMPERATURES WILL BE ABOVE
AVERAGE MON THROUGH FRI.

&&

.AVIATION...OVERALL...VFR CONDITIONS EXPECTED TONIGHT THROUGH
SATURDAY NIGHT.  SOME TSTMS THIS EVENING MAY BRIEFLY REDUCE CEILINGS
AND VSBYS INTO MVFR CATEGORY...ESPECIALLY AT KDGW/LUSK AND KCDR.
THESE SAME LOCATIONS MAY ALSO HAVE A LOW CLOUD DECK AND SOME FOG
LATE TONIGHT AND EARLY SATURDAY MORNING.

&&

.FIRE WEATHER...SATURDAY WILL BRING HOT TEMPS AND LOW HUMIDITIES
WITH NEAR RED FLAG CONDITIONS DEVELOPING OVER ALBANY AND CARBON
COUNTIES.  WINDS WILL MAINLY STAY IN THE RANGE OF 15G25 MPH
THOUGH SO HELD OFF ON A WATCH FOR NOW.

&&

.CYS WATCHES/WARNINGS/ADVISORIES...
WY...NONE.
NE...NONE.

&&

JLH/JR

Hazardous weather outlook, Jul 18, 11:00 AM MDT, 7 hours 30 minutes before

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In the hours before

Special weather statement, Jul 18, 3:31 PM MDT, 2 hours 59 minutes before

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Special weather statement, Jul 18, 3:59 PM MDT, 2 hours 31 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
359 PM MDT FRI JUL 18 2008

WYZ059-060-190000-
CONVERSE-NIOBRARA-
INCLUDING THE CITIES OF...DOUGLAS...GLENROCK...LUSK
359 PM MDT FRI JUL 18 2008

...STRONG THUNDERSTORM MOVING ACROSS EASTERN CONVERSE COUNTY AND
NIOBRARA COUNTY...

AT 355 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF STRONG THUNDERSTORMS MOVING EAST-NORTHEAST ACROSS EASTERN
CONVERSE COUNTY AT AROUND 35 MPH. PEA SIZED HAIL...BRIEF HEAVY
RAIN AND WIND GUSTS TO AROUND 50 MPH CAN BE EXPECTED WITH THESE
THUNDERSTORMS AS THEY MOVE INTO AND ACROSS NIOBRARA COUNTY THROUGH
500 PM MDT.

CARPENTER

Special weather statement, Jul 18, 5:05 PM MDT, 1 hour 25 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 4:43 AM MDT	Red Flag Warning	CYS		14 hr

Nearby

Severe Thunderstorm Warnings in Nebraska, 2008 Every severe thunderstorm warning in 2008

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.