Alert archive / Nebraska / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 13, NWS Cheyenne, WY

May 15, 2015Morrill County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at May 15, 2015, 6:19 PM MDT for Morrill County, Nebraska. It was in force for 56 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 15, 2015, 6:19 PM MDT (00:19 UTC)
Expired: May 15, 2015, 7:15 PM MDT
In force: 56 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Morrill County, NE

The radar

The North Platte radar (KLNX), 182 km from the middle of the area, began a volume at 00:19 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 was reported inside it

Time	Report	Where	Remark
May 15, 6:28 PM MDT	HAIL 1.75	6 Wnw Broadwater, NE	MOSTLY PEA TO NICKEL SIZE HAIL WITH LARGEST GOLFBALL.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 15, 12:58 PM MDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 0.3 hours before the alert went out and 193 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: 766 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 1526 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 283 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 5.9

Open this sounding in Storm Lab

The text

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

225 
WUUS55 KCYS 160019
SVRCYS
NEC123-160115-
/O.NEW.KCYS.SV.W.0013.150516T0019Z-150516T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
619 PM MDT FRI MAY 15 2015

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

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

* UNTIL 715 PM MDT

* AT 618 PM MDT...A SEVERE THUNDERSTORM WAS LOCATED OVER THE
  INTERSECTION OF HIGHWAY 385 AND 92...OR 29 MILES NORTH OF SIDNEY...
  MOVING NORTH AT 40 MPH.

  HAZARD...QUARTER SIZE HAIL AND 60 MPH WIND GUSTS. 

  SOURCE...RADAR INDICATED. 

  IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE 
           TO ROOFS...SIDING AND TREES. 

* THIS SEVERE THUNDERSTORM WILL REMAIN OVER MAINLY RURAL AREAS OF
  EASTERN MORRILL COUNTY...INCLUDING THE FOLLOWING LOCATIONS...
  BROADWATER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

TO REPORT SEVERE WEATHER CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY.
THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE OFFICE IN
CHEYENNE.

&&

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM MDT FOR CENTRAL
NEBRASKA.

LAT...LON 4170 10264 4146 10296 4151 10305 4199 10294
      4199 10271 4198 10269 4191 10267 4179 10268
      4175 10267 4174 10265
TIME...MOT...LOC 0018Z 195DEG 37KT 4157 10297 

HAIL...1.00IN
WIND...60MPH

$$

RUBIN

2 follow-up statements

519 
WWUS55 KCYS 160041
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
641 PM MDT FRI MAY 15 2015

NEC123-160115-
/O.CON.KCYS.SV.W.0013.000000T0000Z-150516T0115Z/
MORRILL NE-
641 PM MDT FRI MAY 15 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM MDT
FOR EASTERN MORRILL COUNTY...

AT 639 PM MDT...A SEVERE THUNDERSTORM WAS LOCATED 12 MILES SOUTHEAST
OF ANGORA...OR 21 MILES SOUTH OF ALLIANCE...MOVING NORTH AT 45 MPH.

HAZARD...QUARTER SIZE HAIL AND 60 MPH WIND GUSTS. 

SOURCE...RADAR INDICATED. AT 628 PM MDT...GOLFBALL SIZE HAIL WAS 
         REPORTED 6 MILES WEST NORTHWEST OF BROADWATER. 

IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE TO 
         ROOFS...SIDING AND TREES. 

THIS SEVERE THUNDERSTORM WILL REMAIN OVER MAINLY RURAL AREAS OF
EASTERN MORRILL COUNTY...INCLUDING THE FOLLOWING LOCATIONS...
BROADWATER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF A TORNADO OR OTHER SEVERE WEATHER IS SPOTTED...REPORT IT TO THE
NATIONAL WEATHER SERVICE OR YOUR LOCAL AUTHORITY WHO WILL SEND YOUR
REPORT. THIS ACT MAY SAVE LIVES OF OTHERS IN THE PATH OF DANGEROUS
WEATHER.

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

TO REPORT SEVERE WEATHER CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY.
THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE OFFICE IN
CHEYENNE.

&&

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM MDT FOR CENTRAL
NEBRASKA.

LAT...LON 4170 10264 4146 10296 4151 10305 4199 10294
      4199 10271 4198 10269 4191 10267 4179 10268
      4175 10267 4174 10265
TIME...MOT...LOC 0039Z 195DEG 37KT 4179 10289 

HAIL...1.00IN
WIND...60MPH

$$

RUBIN

890 
WWUS55 KCYS 160110
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
710 PM MDT FRI MAY 15 2015

NEC123-160119-
/O.EXP.KCYS.SV.W.0013.000000T0000Z-150516T0115Z/
MORRILL NE-
710 PM MDT FRI MAY 15 2015

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN MORRILL COUNTY WILL
EXPIRE AT 715 PM MDT...
                
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSE AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.  HOWEVER SMALL
HAIL....GUSTY WINDS AND HEAVY RAIN ARE STILL POSSIBLE WITH THIS
THUNDERSTORM.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM MDT FOR CENTRAL
NEBRASKA.

LAT...LON 4170 10264 4146 10296 4151 10305 4199 10294
      4199 10271 4198 10269 4191 10267 4179 10268
      4175 10267 4174 10265
TIME...MOT...LOC 0107Z 195DEG 37KT 4179 10289 

$$

RUBIN

The office that day

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

Issued	Product	Office	Counties	Lasted
May 15, 6:09 PM MDT	Special Weather Statement	CYS	Morrill	66 min
May 15, 6:15 PM MDT	Special Weather Statement	CYS	Morrill	45 min
May 15, 6:28 PM MDT	Areal Flood Advisory	CYS	Morrill	3 hr

Nearby

Severe Thunderstorm Warnings in Nebraska, 2015 Every severe thunderstorm warning in 2015

Sources

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