Alert archive / Nebraska / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 55, NWS Omaha, NE

May 3, 2015Cass County, Sarpy County, Saunders County, Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at May 3, 2015, 11:41 PM CDT for Cass County, Sarpy County, Saunders County, Nebraska. It was in force for 34 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: May 3, 2015, 11:41 PM CDT (04:41 UTC)
Expired: May 4, 2015, 12:15 AM CDT
In force: 34 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Cass County, NE, Sarpy County, NE, Saunders County, NE

The radar

The Omaha radar (KOAX), 27 km from the middle of the area, began a volume at 04:42 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

Omaha, NE (KOAX), launched 00:00Z, 4.7 hours before the alert went out and 27 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: 552 J/kg
Mixed-layer CIN: -245 J/kg
Mixed-layer LCL: 2278 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 113 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 severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Omaha, NE wrote its last area forecast discussion before this severe thunderstorm warning went out at May 3, 7:47 PM CDT, 3 hours 54 minutes earlier.

Area forecast discussion, May 3, 7:47 PM CDT, 3 hours 54 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
747 PM CDT SUN MAY 3 2015

.SHORT TERM...(TONIGHT THROUGH MONDAY NIGHT)
ISSUED AT 336 PM CDT SUN MAY 3 2015

A WEAK MID LEVEL VORT MAX CONTINUES TO DRIFT EAST ACROSS CENTRAL
NEBRASKA THIS AFTERNOON. THIS HAS SPARKED A FEW ISOLATED
THUNDERSTORMS OVER SOUTHEAST NEBRASKA WHICH CONTINUE TO STRUGGLE TO
HOLD TOGETHER. OTHERWISE...A MID LEVEL TROUGH CONTINUES TO SWING
EAST ACROSS THE SOUTHERN CANADIAN PRAIRIE PROVINCES WHILE A STRONGER
TROUGH DIGS OFF THE CALIFORNIA COAST. AT THE SURFACE...A COLD FRONT
EXTENDS FROM SWRN MN THROUGH SOUTHEASTERN SD AND INTO SOUTHWESTERN
NEBRASKA. AHEAD OF THIS IN THE WARM SECTOR...SFC DEWPOINTS REMAIN IN
THE MID TO UPPER 50S WITH SOME LOWER 60S POOLING ACROSS THE CWA.
WITH INCREASING INSTABILITY THIS AFTERNOON DUE TO HEATING...WE
CANNOT RULE OUT A FEW ISOLATED THUNDERSTORMS THROUGH THE LATE
AFTERNOON INTO THE EARLY EVENING. WE WILL BE LACKING DEEP LAYER
SHEAR SO WE DO NOT ANTICIPATED ANY REAL ORGANIZED SEVERE
WEATHER...MAINLY JUST A FEW ISOLATED STRONG STORMS.

THE SFC FRONT WILL STALL ACROSS NORTHERN KANSAS OVERNIGHT AND REMAIN
STATIONARY UNTIL MONDAY AFTERNOON AS IT BEGINS TO DRIFT NORTH. AT
THE SAME TIME..THE ABOVE MENTIONED MID LEVEL SHORTWAVE TROUGH OFF
THE CALIFORNIA COAST WILL BEGIN TO EJECT IMPULSES ACROSS THE
SOUTHWESTERN STATES AND TOWARD EASTERN COLORADO. STORMS MAY BE
ONGOING EARLY IN THE DAY ALONG THE FRONT BUT THE SEVERE RISK WILL
INCREASE WITH PEAK HEATING DURING THE AFTERNOON ALONG SFC
CONVERGENCE NEAR THE BOUNDARY. DEEP LAYER BULK SHEAR VALUES WILL
INCREASE TO NEAR 35 TO 40 KTS ACROSS SOUTHEAST NEBRASKA BY AFTERNOON
AS WELL. ALL OF SOUTHEAST NEB/SOUTHWEST IOWA HAVE BEEN OUTLOOKED IN
A SLIGHT RISK FOR DAY 2.

.LONG TERM...(TUESDAY THROUGH SUNDAY)
ISSUED AT 336 PM CDT SUN MAY 3 2015

THE BOUNDARY CONTINUES TO PUSH NORTH THROUGH THE DAY
TUESDAY...EXTENDING ACROSS THE NORTHERN CWA BY MID DAY GIVING THE
REGION A CONTINUE CHANCE FOR SHOWERS AND THUNDERSTORMS AS UPPER
LEVEL TROUGH BECOMES NEGATIVELY TILTED AS THE BASE MOVES THROUGH NEW
MEXICO/SOUTHERN COLORADO. STRONG WARM/MOIST LOW LEVEL FLOW AHEAD OF
THIS WILL BRING CONTINUED CHANCES FOR SHOWERS AND THUNDERSTORMS
THROUGH THE WEEK IN WARM AIR ADVECTION REGIME. THETA-E AXIS WILL
EXTEND THROUGH THE FORECAST AREA WITH PW'S AROUND 1.25 TO 1.50"
THROUGH THE EARLY PART OF THE WEEK. ANY OF THE STRONGER STORMS WILL
HAVE THE POTENTIAL TO PRODUCE MODERATE TO HEAVY RAINFALL.

AN ACTIVE REMAINDER OF THE WEEK AND NEXT WEEKEND LOOK ACTIVE AS WELL
WITH PIECES OF SHORTWAVE ENERGY EJECTING OUT INTO THE CENTRAL
PLAINS AS A SOUTHWESTERN TROUGH DIGS ACROSS THE FOUR CORNERS REGION.

&&

.AVIATION...(00Z TAFS FOR KOFK...KLNK AND KOMA.)
ISSUED AT 729 PM CDT SUN MAY 3 2015

UNSETTLED WEATHER WILL CONTINUE THROUGH THE FORECAST PERIOD. WEAK
UPPER LEVEL DISTURBANCES WILL BE MOVING THROUGH THE AREA. A COLD
FRONT WILL MOVE SOUTHEAST AND STALL OVER NORTHERN KANSAS AND THEN
MOVE NORTHWARD AS A WARM FRONT ON MONDAY. THUNDERSTORMS ARE
EXPECTED AT KLNK THROUGH 10Z....AND THEN AGAIN AFTER 16Z.
THUNDERSTORMS ARE POSSIBLE AT KOMA AFTER 18Z ON MONDAY. KOFK IS
EXPECTED TO BE WELL BEHIND THE FRONT AND NOT EXPECT THUNDERSTORMS
THROUGH 05/00Z. HOWEVER CLOUD CEILINGS WILL LOWER TO OVC050 BY
04/21Z.

&&

.OAX WATCHES/WARNINGS/ADVISORIES...
NE...NONE.
IA...NONE.
&&

SHORT TERM...KERN
LONG TERM...KERN
AVIATION...SMITH

Hazardous weather outlook, May 3, 11:20 PM CDT, 21 minutes before

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In the hours before

Local storm report, May 3, 9:29 PM CDT, 2 hours 12 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
929 PM CDT SUN MAY 03 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0828 PM     HAIL             5 ESE AUBURN            40.36N 95.75W
05/03/2015  E1.00 INCH       NEMAHA             NE   CO-OP OBSERVER

            STARTED AS PEA SIZE HAIL AT 821 AND GREW TO QUARTER SIZE
            HAIL AT 828 AND CONTINUED HAILING UNTIL 832.

&&

LANDSVORK

Local storm report, May 3, 9:37 PM CDT, 2 hours 4 minutes before

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Local storm report, May 3, 9:40 PM CDT, 2 hours 1 minute before

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Local storm report, May 3, 9:41 PM CDT, 2 hours before

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Local storm report, May 3, 10:19 PM CDT, 1 hour 22 minutes before

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Special weather statement, May 3, 10:55 PM CDT, 46 minutes before

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The office that day

Everything else NWS Omaha, NE issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 3, 7:11 PM CDT	Severe Thunderstorm Warning	OAX	Colfax, Platte	17 min
May 3, 7:19 PM CDT	Severe Thunderstorm Warning	OAX	Cuming	19 min
May 3, 7:23 PM CDT	Severe Thunderstorm Warning	OAX	Cuming	37 min
May 3, 7:29 PM CDT	Severe Thunderstorm Warning	OAX	Johnson	31 min
May 3, 7:40 PM CDT	Severe Thunderstorm Warning	OAX	Cuming, Stanton	19 min
May 3, 7:44 PM CDT	Severe Thunderstorm Warning	OAX	Lancaster, Otoe	46 min
May 3, 7:46 PM CDT	Areal Flood Advisory	OAX	Cuming	3 hr
May 3, 7:55 PM CDT	Severe Thunderstorm Warning	OAX	Thurston	39 min
May 3, 7:59 PM CDT	Severe Thunderstorm Warning	OAX	Johnson, Nemaha, Otoe	31 min
May 3, 8:08 PM CDT	Severe Thunderstorm Warning	OAX	Lancaster, Otoe	37 min
May 3, 8:24 PM CDT	Special Weather Statement	OAX	Cuming	51 min
May 3, 8:30 PM CDT	Tornado Warning	OAX	Gage, Johnson, Lancaster	30 min
May 3, 8:31 PM CDT	Severe Thunderstorm Warning	OAX	Thurston	29 min
May 3, 8:33 PM CDT	Severe Thunderstorm Warning	OAX	Johnson, Nemaha, Otoe	42 min
May 3, 8:56 PM CDT	Tornado Warning	OAX	Nemaha	34 min
May 3, 9:01 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Johnson, Otoe	29 min
May 3, 9:02 PM CDT	Areal Flood Advisory	OAX	Johnson, Lancaster, Nemaha, Otoe	3 hr
May 3, 9:29 PM CDT	Severe Thunderstorm Warning	OAX	Johnson, Nemaha, Pawnee	46 min
May 3, 9:31 PM CDT	Severe Thunderstorm Warning	OAX	Nemaha	29 min
May 3, 10:04 PM CDT	Severe Thunderstorm Warning	OAX	Sarpy, Saunders	41 min
May 3, 10:06 PM CDT	Severe Thunderstorm Warning	OAX	Johnson, Nemaha	24 min
May 3, 10:15 PM CDT	Severe Thunderstorm Warning	OAX	Saunders	30 min
May 3, 10:55 PM CDT	Special Weather Statement	OAX	Gage	50 min
May 3, 11:23 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Pawnee	37 min
May 3, 11:53 PM CDT	Severe Thunderstorm Warning	OAX	Lancaster, Saunders	26 min
May 4, 12:17 AM CDT	Severe Thunderstorm Warning	OAX	Cass, Otoe	28 min
May 4, 12:25 AM CDT	Severe Thunderstorm Warning	OAX	Otoe	35 min
May 4, 1:11 AM CDT	Special Weather Statement	OAX	Nemaha, Otoe	49 min
May 4, 1:21 AM CDT	Severe Thunderstorm Warning	OAX	Johnson, Nemaha, Otoe	24 min
May 4, 2:35 AM CDT	Areal Flood Advisory	OAX	Johnson, Nemaha, Otoe	4 hr
May 4, 6:02 AM CDT	Special Weather Statement	OAX	Cass	43 min

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.