Alert archive / Nebraska / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 54, NWS Cheyenne, WY

July 1, 2001Morrill County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 1, 2001, 3:37 PM MDT for Morrill County, Nebraska. It was in force for 53 min. 2 reports came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: Jul 1, 2001, 3:37 PM MDT (21:37 UTC)
Expired: Jul 1, 2001, 4:30 PM MDT
In force: 53 min
Issued by: NWS Cheyenne, WY
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Morrill County, NE

What was reported inside it

Time	Report	Where	Remark
Jul 1, 4:25 PM MDT	Hail 1.5	Broadwater, NE
Jul 1, 4:31 PM MDT	Hail 2.75	Broadwater, NE

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 9.6 hours before the alert went out and 203 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 502 J/kg
Mixed-layer CIN: -238 J/kg
Mixed-layer LCL: 1256 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 153 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS55 KCYS 012137
SVRCYS

NEC123-012230-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
337 PM MDT SUN JUL 1 2001

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN MORRILL COUNTY IN THE PANHANDLE OF NEBRASKA

* UNTIL 430 PM MDT

* AT 334 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 20 MILES NORTH OF BROADWATER...OR ABOUT 15
  MILES SOUTH OF ALLIANCE...MOVING SOUTH AT 15 MPH.

IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER
AWAY FROM CREEK BEDS AND OTHER FLOOD-PRONE AREAS. REMEMBER...A SEVERE
THUNDERSTORM CAN PRODUCE LARGE DAMAGINKG HAIL...DAMAGING WINDS IN
EXCESS OF 55 MPH...DEADLY LIGHTNING...AND VERY HEAVY RAIN.

LAT...LON 4199 10277 4199 10310 4144 10306 4145 10268

DAUGHERTY

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 1, 1:45 PM MDT, 1 hour 52 minutes earlier.

Area forecast discussion, Jul 1, 1:45 PM MDT, 1 hour 52 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
145 PM MDT SUN JUL 1 2001

APPEARS TO BE ENOUGH SUBSIDENCE BEHIND UPPER FEATURE MOVING INTO
PLAINS THAT IT IS INHIBITING DEVELOPMENT THIS AFTERNOON.  STILL
EXPECT SOME STORMS TO FIRE ON WEAK BOUNDARIES...LIKE ONE FROM ARL TO
LAR AND ANOTHER ONE ACROSS W LARAMIE COUNTY.  AIRMASS ALSO REMAINS
STRONGLY CAPPED.  FRONT HAS RETREATED N...NOW NEAR S EDGE OF LOW
CLOUDS FROM LUSK TO N OF AIA.  NEXT S/WV TROF APPEARS TO BE THE ONE
BACK OVER CENTRAL UT TURNING NNE AROUND UPPER HIGH.  AVN LIKELY TOO
STRONG AND FAST WITH THIS FEATURE...WILL LEAN TOWARD MESOETA WHICH
DOES BRING IT INTO OUR AREA...MAINLY LATER THIS EVENING.  FEATURE
WEAKENS WITH TIME...BUT MAY BE ENOUGH FOR SOME TSTMS ON MON
AFTERNOON SE WY.  FRONT FCST TO REMAIN ABOUT WHERE IT IS NOW THROUGH
MON...WITH ANOTHER HOT DAY LIKELY ON MON S OF FRONT.  IN LONGER RANGE
...THE ETA IS STRONGEST WITH A FEATURE WHICH MOVES INTO THE REGION
ON MON EVENING.  AVN ALSO SUGGESTS IT IS THERE.  BOTH MODELS HAVE
DECENT RISING MOTION WITH FEATURE...WITH SOME RAIN...AND ALSO USE IT
TO HELP FORCE FRONT S AGAIN MON NIGHT.  TUE LOOKS TO BE A BIT COOLER
E OF MTNS WITH SFC HIGH BUILDING INTO MT/DAKS...BUT AGAIN CAN'T RULE
OUT A FEW LATE DAY STORMS.  IN EXTENDED...NOT MUCH CHANGES...UPPER
HIGH SHIFTS A LITTLE WNW INTO UT...THEN DROPS SE INTO CO...WHILE
FLOW ALOFT BECOMES A BIT MORE NW OVER REGION.  WILL GIVE UP ON IDEA
OF NOTICEABLY COOLER WEATHER SLIPPING INTO REGION...ALTHOUGH APPEARS
THAT WED/THU SHOULD BE A BIT COOLER...THEN WARMER AGAIN ON FRI/SAT.
HOWEVER...TEMPS NOT CHANGING BY MUCH MORE THAN 5 TO 8 DEGREES...NOT
REALLY WORTH BREAKING OUT SPECIFIC DAYS FOR.  THREAT OF LATE DAY
STORMS CONTINUES...ESPECIALLY E OF MTNS WHERE IT LOOKS LIKE DECENT
MOISTURE WILL CONTINUE TO BE IN PLACE.

.CYS...
WY...NONE.
NE...NONE.

JAD

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 8:22 PM MDT	Severe Thunderstorm Warning	CYS	Scotts Bluff	53 min
Jun 30, 9:13 PM MDT	Severe Thunderstorm Warning	CYS	Scotts Bluff	47 min
Jun 30, 9:34 PM MDT	Severe Thunderstorm Warning	CYS	Banner	56 min
Jul 1, 4:26 PM MDT	Severe Thunderstorm Warning	CYS	Morrill	64 min
Jul 1, 4:49 PM MDT	Severe Thunderstorm Warning	CYS	Cheyenne	41 min
Jul 1, 5:35 PM MDT	Severe Thunderstorm Warning	CYS	Cheyenne	25 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2001 Every severe thunderstorm warning in 2001

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.