Alert archive / Nebraska / Special Weather Statements in 2021

Special Weather Statement, NWS Hastings, NE

August 7, 2021Polk County, Nebraska

NWS Hastings, NE issued this special weather statement at Aug 7, 2021, 10:03 PM CDT for Polk County, Nebraska. It was in force for 27 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 7, 2021, 10:03 PM CDT (03:03 UTC)
Expired: Aug 7, 2021, 10:30 PM CDT
In force: 27 min
Issued by: NWS Hastings, NE
Hail: 0.00 in
Wind: 40

County Polk County, NE

The radar

The Omaha radar (KOAX), 94 km from the middle of the area, began a volume at 03:02 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, 3.1 hours before the alert went out and 94 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: 2933 J/kg
Mixed-layer CIN: -124 J/kg
Mixed-layer LCL: 1327 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 149 m²/s²
0-3 km storm-relative helicity: 195 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 3.3

Open this sounding in Storm Lab

The text

As transmitted.

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Hastings, NE wrote its last area forecast discussion before this special weather statement went out at Aug 7, 6:24 PM CDT, 3 hours 39 minutes earlier.

Area forecast discussion, Aug 7, 6:24 PM CDT, 3 hours 39 minutes before

AREA FORECAST DISCUSSION
National Weather Service Hastings NE
624 PM CDT Sat Aug 7 2021

...Aviation Update...

.DISCUSSION...(This evening through Saturday)
Issued at 234 PM CDT Sat Aug 7 2021

The main focus in this forecast package is the threat for severe
convection this evening.

Currently, satellite and radar showers and non severe thunderstorms
continuing to percolate in areas near of just north of Interstate
80. Meanwhile areas to the south and west are mostly cloud-free
at this point, which should provide ample heating to promote
convective development late this afternoon and evening. MLCAPE
values are expected to be on the order of 2500-3500J/kg by 6pm.
Shear is not off the charts by any means, but 30-35kts will be
sufficient for organized severe updrafts.

Initially, we are still anticipating two areas for convective
development. Firstly, high-res CAMs suggest development along the
weak cold front setting along our western periphery...roughly from
McCook up to Broken Bow. This activity will likely be very slow to
move off of the front due to shear vectors remaining largely
parallel to the front. Secondly, many models, including the last
several runs of the HRRR, show convection developing near or just
south of the KS/NE state line then rapidly expanding into one or
more line segments across the southeastern half of the area. With
this area being mostly cloud-free currently, this certainly seems
like a reasonable solution.

Severe convection will likely push east of the area by around
midnight, with only a few lingering showers and storms into early
Sunday morning. The rest of the day on Sunday should be dry and high
temperatures should push back into the 90s as we see rising heights
aloft. The warm pattern then continues on Monday, with the NAM and
EC even showing some areas approaching 100 degrees. Heat index
values are currently forecast to be sub-advisory (105 degrees) for
most areas, but it will be close in our south and east.

Additional chances for thunderstorms arrive Monday evening as an
upper low moves over the northern Plains and a surface cold front is
pushed into the area. Chances for thunderstorms linger on Tuesday as
well before the front departs. Temperatures are expected to remain
above normal (though not excessively so) through the rest of the
week. Daily highs are forecast to be in the upper 80s to 90s. The
rest of the week is also expected to remain largely dry, although we
will have to monitor another frontal passage in the Thursday-
Friday timeframe.

&&

.AVIATION...(For the 00Z KGRI/KEAR TAFS through 00Z Monday)
Issued at 619 PM CDT Sat Aug 7 2021

Thunderstorms developing over northern Kansas will quickly spread
northeastward over the next 1-2 hours. This may briefly impact
the terminal vicinities...especially GRI in the 01-03Z timeframe.

Skies will clear out on Sunday morning, with mostly clear skies
expected through the afternoon with light/variable winds.

&&

.GID WATCHES/WARNINGS/ADVISORIES...
NE...NONE.
KS...NONE.
&&

DISCUSSION...Mangels
AVIATION...Mangels

Hazardous weather outlook, Aug 7, 1:50 PM CDT, 8 hours 13 minutes before

Hazardous Weather Outlook
National Weather Service Hastings NE
150 PM CDT Sat Aug 7 2021

KSZ005>007-017>019-NEZ039>041-046>049-060>064-072>077-082>087-
081200-
Phillips-Smith-Jewell-Rooks-Osborne-Mitchell-Valley-Greeley-Nance-
Sherman-Howard-Merrick-Polk-Dawson-Buffalo-Hall-Hamilton-York-
Gosper-Phelps-Kearney-Adams-Clay-Fillmore-Furnas-Harlan-Franklin-
Webster-Nuckolls-Thayer-
150 PM CDT Sat Aug 7 2021

This Hazardous Weather Outlook is for south central Nebraska and
portions of north central Kansas.

.DAY ONE...This Afternoon and Tonight.

Scattered thunderstorms are expected to redevelop late this
afternoon and early evening, and some of these storms may be
severe with hail to the size of ping pong balls and damaging wind
gusts up to 70 MPH. The main timeframe for severe weather is 6PM
to 11PM.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Monday is expected to be the hottest day of the coming week, and
heat index values are expected to peak in the 100 to 105 degree
range in most spots.

There are additional chances for thunderstorms Monday evening
through Tuesday night.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this evening, mainly between 6PM
11PM.

&&

More information may be obtained at the following web page:
   https://www.weather.gov/hastings

Mangels

In the hours before

Local storm report, Aug 7, 8:44 PM CDT, 1 hour 19 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HASTINGS NE
844 PM CDT SAT AUG 7 2021

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

0842 PM     HAIL             1 N GRAND ISLAND        40.94N 98.37W
08/07/2021  E0.75 INCH       HALL               NE   LAW ENFORCEMENT

&&

JJW

Local storm report, Aug 7, 8:47 PM CDT, 1 hour 16 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HASTINGS NE
847 PM CDT SAT AUG 7 2021

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

0844 PM     HAIL             2 W GRAND ISLAND        40.92N 98.40W
08/07/2021  U0.75 INCH       HALL               NE   PUBLIC

            REPORT FROM MPING: DIME (0.75 IN.).

&&

MANGELS

Local storm report, Aug 7, 9:15 PM CDT, 48 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HASTINGS NE
915 PM CDT SAT AUG 7 2021

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

0848 PM     TSTM WND GST     3 NNW CHESTER           40.05N 97.63W
08/07/2021  E51 MPH          THAYER             NE   MESONET

&&

MH

Local storm report, Aug 7, 9:21 PM CDT, 42 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HASTINGS NE
921 PM CDT SAT AUG 7 2021

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

0917 PM     HAIL             1 NE GRAND ISLAND       40.94N 98.35W
08/07/2021  E0.70 INCH       HALL               NE   NWS EMPLOYEE

            ALSO MINOR STREET FLOODING OCCURRING AROUND
            GRAND ISLAND.

&&

MH

Local storm report, Aug 7, 9:27 PM CDT, 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HASTINGS NE
927 PM CDT SAT AUG 7 2021

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

0920 PM     FLOOD            2 WNW GRAND ISLAND      40.94N 98.40W
08/07/2021                   HALL               NE   TRAINED SPOTTER

            MINOR FLOODING ON CITY STREETS AND
            UNDERPASSES.

&&

MH

Special weather statement, Aug 7, 10:03 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service Hastings NE
1003 PM CDT Sat Aug 7 2021

NEZ049-064-080330-
York NE-Polk NE-
1003 PM CDT Sat Aug 7 2021

...Strong thunderstorms will impact portions of northeastern York and
southeastern Polk Counties through 1030 PM CDT...

At 1003 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Shelby to Waco. Movement was northeast at
35 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

These storms will remain over mainly rural areas of northeastern York
and southeastern Polk Counties, including the following locations...
Thayer.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 100 AM CDT for
east central Nebraska.

&&

LAT...LON 4088 9751 4131 9745 4135 9737 4091 9737
TIME...MOT...LOC 0303Z 239DEG 31KT 4127 9740 4092 9746

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

Heinlein

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 7, 7:25 PM CDT	Special Weather Statement	GID	Polk	35 min
Aug 7, 7:28 PM CDT	Severe Thunderstorm Warning	GID	Adams, Clay, Nuckolls, Webster	32 min
Aug 7, 7:37 PM CDT	Special Weather Statement	GID	Webster	23 min
Aug 7, 7:46 PM CDT	Severe Thunderstorm Warning	GID	Polk	29 min
Aug 7, 7:54 PM CDT	Severe Thunderstorm Warning	GID	Clay, Fillmore, Hamilton, York	51 min
Aug 7, 7:59 PM CDT	Severe Thunderstorm Warning	GID	Adams, Clay, Hall, Hamilton, Kearney, Merrick	31 min
Aug 7, 8:10 PM CDT	Severe Thunderstorm Warning	GID	Hall, Hamilton, Merrick, Nance, Polk, York	50 min
Aug 7, 8:20 PM CDT	Special Weather Statement	GID	Franklin	25 min
Aug 7, 8:23 PM CDT	Severe Thunderstorm Warning	GID	Franklin, Harlan, Webster	52 min
Aug 7, 8:24 PM CDT	Severe Thunderstorm Warning	GID	Adams, Clay, Hall, Hamilton	29 min
Aug 7, 8:46 PM CDT	Severe Thunderstorm Warning	GID	Adams, Buffalo, Hall, Kearney	44 min
Aug 7, 8:57 PM CDT	Severe Thunderstorm Warning	GID	Hamilton, Merrick, Polk, York	33 min
Aug 7, 9:03 PM CDT	Severe Thunderstorm Warning	GID	Thayer	42 min
Aug 7, 9:27 PM CDT	Severe Thunderstorm Warning	GID	Hall, Hamilton, Howard, Merrick	33 min
Aug 7, 9:30 PM CDT	Areal Flood Advisory	GID	Hall, Hamilton, Merrick, Polk, York	9 hr
Aug 7, 9:30 PM CDT	Severe Thunderstorm Warning	GID	Merrick, Nance, Polk	30 min
Aug 7, 9:44 PM CDT	Flash Flood Warning	GID	Polk	6 hr
Aug 7, 9:55 PM CDT	Severe Thunderstorm Warning	GID	Hall, Howard, Merrick	17 min
Aug 8, 1:24 AM CDT	Special Weather Statement	GID	Webster	36 min
Aug 8, 1:32 AM CDT	Severe Thunderstorm Warning	GID	Webster	28 min
Aug 8, 2:05 AM CDT	Special Weather Statement	GID	Adams, Webster	25 min
Aug 8, 2:37 AM CDT	Special Weather Statement	GID	Hall	23 min
Aug 8, 3:04 AM CDT	Special Weather Statement	GID	Hall	26 min
Aug 8, 3:36 AM CDT	Areal Flood Warning	GID	Polk	7 hr
Aug 8, 2:09 PM CDT	Heat Advisory	GID	Adams, Buffalo, Clay, Fillmore, Franklin, Hall and 10 more	55 hr
Aug 7, 7:14 PM CDT	Severe Thunderstorm Warning	GID	Jewell, Mitchell, Osborne, Smith	46 min
Aug 7, 7:48 PM CDT	Special Weather Statement	GID	Jewell	27 min
Aug 7, 7:51 PM CDT	Severe Thunderstorm Warning	GID	Osborne, Phillips, Smith	39 min
Aug 7, 8:03 PM CDT	Severe Thunderstorm Warning	GID	Jewell	42 min

Nearby

Special Weather Statements in Nebraska, 2021 Every special weather statement in 2021

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.