Alert archive / Missouri / Special Weather Statements in 2017

Special Weather Statement, NWS St. Louis, MO

March 1, 2017Saint Louis County, City of Saint Louis, Missouri

NWS St. Louis, MO issued this special weather statement at Mar 1, 2017, 1:56 AM CST for Saint Louis County, City of Saint Louis, Missouri. 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 outline as issued.

The facts

Issued: Mar 1, 2017, 1:56 AM CST (07:56 UTC)
Expired: Mar 1, 2017, 2:30 AM CST
In force: 34 min
Issued by: NWS St. Louis, MO

Counties City of Saint Louis, MO, Saint Louis County, MO

The radar

The St Louis radar (KLSX), 38 km from the middle of the area, began a volume at 07:57 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 text

As transmitted.

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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 St. Louis, MO wrote its last area forecast discussion before this special weather statement went out at Feb 28, 11:55 PM CST, 2 hours 1 minute earlier.

Area forecast discussion, Feb 28, 11:55 PM CST, 2 hours 1 minute before

Area Forecast Discussion...Updated Aviation
National Weather Service Saint Louis MO
1155 PM CST Tue Feb 28 2017

.SHORT TERM...  (Through Late Wednesday Afternoon)
Issued at 301 PM CST Tue Feb 28 2017

Cold front extends from a surface low over southeastern IA southwest
into the OK Panhandle.  A wind advisory is in effect across parts of
northeast and central MO and west central IL where very strong wind
gusts were occurring due to a tight surface pressure gradient and
momentum transfer to the surface underneath a strong southwest low
level jet.  Tornado watches have been issued for our forecast area
for the rest of the afternoon into the early evening hours.
Sufficient wind shear/instability exists for scattered supercells in
the warm sector capable of large hail, damaging winds and isolated
tornadoes late this afternoon and early this evening.  As an upper
level trough over the Plains approaches, the cold front will drop
southeastward through our forecast area tonight.  A greater coverage
of storms is expected along this front with the potential for more
severe storms late this evening and into the overnight hours.  The
primary threat with this second round of storms will be damaging
winds.  The threat of severe storms should end by early Wednesday
morning with lingering showers and a few storms across southeast MO
and southwest IL until late morning. Colder temperatures can be
expected tonight across northeast MO due to cold air advection
behind the cold front, then colder conditions for the entire area on
Wednesday with only a small diurnal rise in temperatures expected.
The sky should gradually clear out from southwest to northeast late
Tuesday morning and afternoon as a surface ridge builds
southeastward into our area behind the cold front, and as the upper
level trough begins to shift northeast of our area.

GKS

.LONG TERM...  (Wednesday Night through Next Tuesday)
Issued at 301 PM CST Tue Feb 28 2017

(Wednesday night - Next Monday night)

High pressure over the area begins to push east Wednesday night into
early Thursday morning ahead an approaching short wave trough. The
short wave trough will swing through NE MO/WC IL but will likely be
a dry passage. The dry weather will persist till late Sunday night
into Monday as another frontal boundary passes through the region
providing chances of showers and thunderstorms. The front departs
the area on Monday night and high pressure slides into the region
from the Northern Plains.

Temperatures will return to seasonal values on Thursday and Friday,
then once again go above seasonal norms for the reminder of the
forecast period.

Kelly
&&

.AVIATION...  (For the 06z TAFs through 06z Wednesday Night)
Issued at 1150 PM CST Tue Feb 28 2017

Cold front moving southeast through taf sites, already south of
UIN as of 05z. Showers and storms to persist through about 11z
Wednesday before coming to an end. Otherwise, VFR cigs to briefly
dip down to MVFR behind frontal boundary, then bounce back up to
VFR by mid to late morning. Other main issue will be the winds.
Winds to veer to the west to northwest behind boundary and become
gusty. Winds will diminish by sunset Wednesday evening.

SPECIFICS FOR KSTL:
Cold front moving southeast through region. Showers and storms to
persist through about 11z Wednesday before coming to an end.
Otherwise, VFR cigs to briefly dip down to MVFR behind frontal
boundary, then bounce back up to VFR by 16z Wednesday. Other main
issue will be the winds. Winds to veer to the west to northwest
behind boundary and become gusty, before diminishing by 03z
Thursday.

Byrd
&&

.LSX WATCHES/WARNINGS/ADVISORIES...
MO...None.
IL...None.
&&

WFO LSX

In the hours before

Local storm report, Mar 1, 12:01 AM CST, 1 hour 55 minutes before

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Local storm report, Mar 1, 1:07 AM CST, 49 minutes before

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Local storm report, Mar 1, 1:30 AM CST, 26 minutes before

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Special weather statement, Mar 1, 1:43 AM CST, 13 minutes before

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Local storm report, Mar 1, 1:53 AM CST, 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
153 AM CST WED MAR 01 2017

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

0153 AM     HAIL             VILLA RIDGE             38.47N  90.88W
03/01/2017  E0.50 INCH       FRANKLIN           MO   TRAINED SPOTTER

&&

EVENT NUMBER LSX1700195

BRITT

Special weather statement, Mar 1, 1:56 AM CST, 0 minutes before

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The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 28, 6:14 PM CST	Tornado Warning	LSX	Reynolds	30 min
Feb 28, 6:16 PM CST	Severe Thunderstorm Warning	LSX	Iron, Reynolds	44 min
Feb 28, 6:56 PM CST	Tornado Warning	LSX	Iron, Madison, Reynolds, Saint Francois	34 min
Feb 28, 6:59 PM CST	Severe Thunderstorm Warning	LSX	Iron, Madison, Sainte Genevieve, Saint Francois	46 min
Feb 28, 7:30 PM CST	Tornado Warning	LSX	Madison, Sainte Genevieve, Saint Francois	19 min
Feb 28, 7:34 PM CST	Severe Thunderstorm Warning	LSX	Sainte Genevieve, Saint Francois	17 min
Feb 28, 7:57 PM CST	Severe Thunderstorm Warning	LSX	Marion, Monroe, Shelby	48 min
Feb 28, 8:29 PM CST	Severe Thunderstorm Warning	LSX	Marion, Ralls	33 min
Feb 28, 8:37 PM CST	Tornado Warning	LSX	Marion, Ralls	27 min
Feb 28, 9:19 PM CST	Severe Thunderstorm Warning	LSX	Madison	17 min
Feb 28, 9:23 PM CST	Tornado Warning	LSX	Madison	11 min
Feb 28, 11:04 PM CST	Severe Thunderstorm Warning	LSX	Boone, Moniteau	41 min
Mar 1, 1:43 AM CST	Special Weather Statement	LSX	Crawford, Franklin, Washington	47 min
Mar 1, 2:15 AM CST	Severe Thunderstorm Warning	LSX	Saint Louis, City of Saint Louis	34 min
Mar 1, 2:17 AM CST	Special Weather Statement	LSX	Iron, Sainte Genevieve, Saint Francois, Washington	43 min
Mar 1, 3:11 AM CST	Severe Thunderstorm Warning	LSX	Iron, Reynolds	36 min
Mar 1, 3:37 AM CST	Special Weather Statement	LSX	Madison	23 min
Feb 28, 6:14 PM CST	Severe Thunderstorm Warning	LSX	Monroe, Randolph, Saint Clair, Washington	46 min
Feb 28, 6:22 PM CST	Severe Thunderstorm Warning	LSX	Fayette	23 min
Feb 28, 6:57 PM CST	Severe Thunderstorm Warning	LSX	Clinton, Marion, Washington	48 min
Feb 28, 8:08 PM CST	Tornado Warning Tornado observed	LSX	Randolph	14 min
Feb 28, 9:07 PM CST	Severe Thunderstorm Warning	LSX	Adams, Brown, Pike	38 min
Feb 28, 9:23 PM CST	Tornado Warning	LSX	Brown, Pike	22 min
Mar 1, 2:39 AM CST	Severe Thunderstorm Warning	LSX	Clinton, Washington	25 min

Nearby

Special Weather Statements in Missouri, 2017 Every special weather statement in 2017

Sources

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