Temps | Gusts | WU KORD KPWK

CLICK for this month's BIG night sky ...




Cardinal SAT


MOBILE DEVICE? Turn sideways. Weather conditions directly above are near Lakefront. Top tabs refer to O'Hare (official).

Archives for the SPC Convective Outlook are updated daily (approximately) with a live map at the beginning of each article. Follow the link at the end of the article to check for current updates on the NOAA/NWS Storm Prediction Center website. Also, see Archives for Chicago's hourly weather data on CARDINAL NEWS Magazine.


Saturday, July 6, 2024

SPC Jul 6, 2024 1630 UTC Day 1 Convective Outlook

LIVE MAP (ABOVE) ... SPC 1630Z Day 1 Outlook

Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1134 AM CDT Sat Jul 06 2024

Valid 061630Z - 071200Z


Scattered severe thunderstorms are expected across the central
Plains this afternoon into evening, including central/eastern
Nebraska and western/northern Kansas. Large to very large hail and
severe wind gusts are the primary hazards.

...Central/Southern Plains to Upper Midwest...
A shortwave trough over the western Dakotas will continue
southeastward, with a cyclonically curved belt of seasonally strong
westerlies (40+ kt) from the north-central High Plains to the
central Plains and middle/lower Missouri Valley. A weak area of low
pressure will migrate slowly eastward from northeast Colorado toward
the Nebraska/Kansas border vicinity as a weak front advances
southeastward across the central High Plains.

Moderate destabilization is expected near a surface trough across
western Kansas into southwest/south-central Nebraska, to the south
of ongoing showers/thunderstorms at midday generally I-80 and
northward. These initially elevated storms will probably
increasingly interface with a warming and modestly moist boundary
layer and trend increasingly surface-based this afternoon on their
southern periphery.

Steep 700-500 mb lapse rates from 7-8 C/km and a relatively strong
wind profile will support storm organization, potentially including
a couple of supercells capable of large to very large hail.
Relatively quick upscale growth into a couple of
southeastward-moving clusters is expected towards early evening.
Severe gusts will likely become more prevalent during this evolution
towards more outflow-dominant storms.

Further west, isolated thunderstorms will also be possible behind
the front from the central High Plains northeastward into southern
South Dakota. In this area, lower surface dewpoints and weaker
instability should keep the severe threat more isolated and
marginal. Some severe risk is also expected to develop southward
across parts of the southern High Plains, where a small or cluster
or two capable of strong/potentially severe wind gusts could occur.

...Northeast States...
Widely scattered thunderstorms are expected to develop and increase
this afternoon from the lower Hudson Valley and especially into
upstate eastern New York and northern New England, influenced by
higher terrain/differential heating as well as a wind shift/weak
eastward-moving front. Pre-convective MLCAPE may reach 1250-1500
J/kg, with relatively long/semi-straight hodographs with 50+ kt
effective shear. Sustained multicells are expected with some
possibility of a few transient/weak supercells. Localized 50-60 mph
gusts capable of wind damage are possible with the stronger storms
this afternoon through early evening.

..Guyer/Jewell.. 07/06/2024

SUNRISE AND SUNSET TIMES IN UTC (if you're not logged in to Google)
CHICAGO UTC-6 during CST (Central Standard Time, e.g., winter)
CHICAGO UTC-5 during CDT (Daylight Savings Time, e.g., summer)