Alert archive / Nebraska / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 45, NWS Omaha, NE
NWS Omaha, NE issued this severe thunderstorm warning at May 25, 2018, 3:35 PM CDT for Washington County, Nebraska; Harrison County, Iowa. It was in force for 25 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 25, 2018, 3:35 PM CDT (20:35 UTC)
- Expired
- May 25, 2018, 4:00 PM CDT
- In force
- 25 min
- Issued by
- NWS Omaha, NE
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Harrison County, IA, Washington County, NE
The radar
The Omaha radar (KOAX), 43 km from the middle of the area, began a volume at 20:35 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 12:00Z, 8.6 hours before the alert went out and 43 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.
- Mixed-layer CAPE
- 502 J/kg
- Mixed-layer CIN
- -278 J/kg
- Mixed-layer LCL
- 1260 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 135 m²/s²
- 0-3 km storm-relative helicity
- 133 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 25, 2:45 PM CDT, 50 minutes earlier.
Area forecast discussion, May 25, 2:45 PM CDT, 50 minutes before
Area Forecast Discussion
National Weather Service Omaha/Valley NE
245 PM CDT Fri May 25 2018
.SHORT TERM...(Tonight through Monday)
Issued at 241 PM CDT Fri May 25 2018
There is very weak trough moving through the area currently, which
has triggered a lone thundershower between Fremont and Blair. There
is also a secondary weak surface trough moving into north central
NE with a couple of showers developing within a towering cu field
south of Valentine. A few of the high res models, including ESRL
HRRR/HRRR/Rap and the GFS hint at a small chance of storms along
these troughs as they moves into our area through the evening,
but there isn't really any upper level support. Will continue to
monitor near term trends, but except for a couple of showers or
storms, most of the area could remain dry tonight.
The bigger picture this weekend will be hot and dry conditions
developing as upper level ridging builds onto the Plains out of
the Rockies. This will result in highs reaching the mid to upper
90s the next couple of days, which would tie or break records in
some locations both Saturday and Sunday (see Climate section for
details). Highs still in the lower 90s on Memorial Day, but not
warm enough to break records this day. The upper ridge also shifts
slightly east by Monday, which could allow isolated storms to
impact eastern NE, but otherwise, we're looking at dry holiday
Memorial Day weekend, which hasn't happened in recent memory.
Welcome to Summer.
.LONG TERM...(Monday night through Friday)
Issued at 241 PM CDT Fri May 25 2018
Active weather returns Tuesday night into early Wednesday as an
upper trough moves into the area. Thunderstorms become likely
during this time, some of which could be strong Tuesday
afternoon and evening. Low confidence in the remainder of the
forecast as ECMWF suggests storms on Thursday, but GFS is dry.
Well above normal temperatures continue through the extended
period.
&&
.AVIATION...(For the 18Z TAFS through 18Z Saturday afternoon)
Issued at 1221 PM CDT Fri May 25 2018
VFR conditions will prevail thru the fcst pd.
&&
.CLIMATE...
Issued at 241 PM CDT Fri May 25 2018
Max temp records next few days:
OMAHA LINCOLN NORFOLK
=================================
Friday, May 25 97/1967 98/1967 103/1967
Saturday, May 26 96/1912* 98/1912 95/1914*
Sunday, May 27 94/2012* 95/1966* 93/2006*
Monday, May 28 97/1895 98/1895 100/1974
* Record could be tied or broken based on the upcoming forecast.
Based on the upcoming forecast, we also have the chance of tying
the record of consecutive highs 90 or higher for the Month of May,
which is 6 from May 20-25, 1921.
&&
.OAX WATCHES/WARNINGS/ADVISORIES...
NE...None.
IA...None.
&&
SHORT TERM...DeWald
LONG TERM...DeWald
AVIATION...DEE
CLIMATE...DeWaldHazardous weather outlook, May 25, 11:41 AM CDT, 3 hours 54 minutes before
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</html>In the hours before
Special weather statement, May 25, 3:19 PM CDT, 16 minutes before
Special Weather Statement National Weather Service Omaha/Valley Nebraska 319 PM CDT FRI MAY 25 2018 IAZ055-069-NEZ044-045-052-252045- Pottawattamie IA-Harrison IA-Washington NE-Douglas NE-Dodge NE- 319 PM CDT FRI MAY 25 2018 ...SPECIAL WEATHER STATEMENT... At 318 PM CDT, Doppler radar was tracking a strong thunderstorm near Kennard, or 14 miles northwest of Omaha, moving east at 25 mph. Half inch hail and winds in excess of 30 mph will be possible with this storm. Locations impacted include... Northern Omaha, Blair, Missouri Valley, Arlington, Underwood, Fort Calhoun, Kennard, Bennington, Crescent, McClelland, Washington, Wilson Island State Park, Desoto Bend National Wildlife Refuge and Hitchcock Nature Center. PRECAUTIONARY/PREPAREDNESS ACTIONS... To report severe weather, contact your nearest law enforcement agency. They will relay your report to the National Weather Service office in Omaha. && LAT...LON 4139 9637 4151 9639 4157 9567 4130 9566 TIME...MOT...LOC 2018Z 269DEG 24KT 4143 9618 DEE
Special weather statement, May 25, 3:26 PM CDT, 9 minutes before
Special Weather Statement National Weather Service Omaha/Valley Nebraska 326 PM CDT FRI MAY 25 2018 IAZ055-069-NEZ034-045-252100- Pottawattamie IA-Harrison IA-Burt NE-Washington NE- 326 PM CDT FRI MAY 25 2018 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN POTTAWATTAMIE... SOUTHWESTERN HARRISON...SOUTHEASTERN BURT AND CENTRAL WASHINGTON COUNTIES UNTIL 400 PM CDT... At 326 PM CDT, Doppler radar was tracking a strong thunderstorm 7 miles west of Blair, or 25 miles northwest of Omaha, moving northeast at 10 mph. Dime size hail and winds in excess of 40 mph will be possible with this storm. Locations impacted include... Blair, Missouri Valley, Fort Calhoun, Mondamin, Kennard, Modale, Herman, Desoto Bend National Wildlife Refuge and Wilson Island State Park. 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. && LAT...LON 4145 9630 4161 9641 4184 9609 4147 9584 TIME...MOT...LOC 2026Z 241DEG 6KT 4157 9628 KERN
The office that day
Everything else NWS Omaha, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 25, 3:19 PM CDT | Special Weather Statement | OAX | Douglas | 26 min |
| May 25, 3:26 PM CDT | Special Weather Statement | OAX | Washington | 34 min |
| May 25, 3:58 PM CDT | Special Weather Statement | OAX | Washington | 32 min |
| May 25, 4:25 PM CDT | Special Weather Statement | OAX | Boone | 50 min |
| May 25, 4:30 PM CDT | Special Weather Statement | OAX | Washington | 45 min |
| May 25, 4:56 PM CDT | Special Weather Statement | OAX | Colfax | 49 min |
| May 25, 5:26 PM CDT | Special Weather Statement | OAX | Boone | 49 min |
| May 25, 5:38 PM CDT | Tornado Warning | OAX | Boone | 37 min |
| May 25, 6:10 PM CDT | Special Weather Statement | OAX | Colfax | 50 min |
| May 25, 6:53 PM CDT | Special Weather Statement | OAX | Colfax | 52 min |
Nearby
Severe Thunderstorm Warnings in Nebraska, 2018Severe Thunderstorm Warnings in Iowa, 2018Every severe thunderstorm warning in 2018
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.