Alert archive / Missouri / Heat Advisories in 2015

Heat Advisory 5, NWS St. Louis, MO

July 25, 20155 counties in Missouri

NWS St. Louis, MO issued this heat advisory at Jul 25, 2015, 4:05 PM CDT for 5 counties in Missouri. It took effect at Jul 26, 2015, 12:00 PM CDT. It was in force for 28 hr.

The area

The counties it named.

The facts

Issued
Jul 25, 2015, 4:05 PM CDT (21:05 UTC)
In effect from
Jul 26, 2015, 12:00 PM CDT
Expired
Jul 27, 2015, 3:40 PM CDT
In force
28 hr
Issued by
NWS St. Louis, MO

Counties Boone County, MO, Callaway County, MO, Cole County, MO, Moniteau County, MO, Osage County, MO

The radar

The St Louis radar (KLSX), 131 km from the middle of the area, began a volume at 21:07 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

Topeka, KS (KFOE), launched 12:00Z, 9.1 hours before the alert went out and 301 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-pSkew-T log-p diagram, Topeka, KS at 12:00Z on 2015-07-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 157 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Topeka, KS at 12:00Z on 2015-07-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -3 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
157 J/kg
Mixed-layer CIN
-456 J/kg
Mixed-layer LCL
1208 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
-3 m²/s²
0-3 km storm-relative helicity
-10 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this heat advisory 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 heat advisory went out at Jul 25, 3:52 PM CDT, 13 minutes earlier.

Area forecast discussion, Jul 25, 3:52 PM CDT, 13 minutes before
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Hazardous weather outlook, Jul 25, 5:57 AM CDT, 10 hours 8 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ST LOUIS MO
557 AM CDT SAT JUL 25 2015

ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027-
034>036-041-042-047>052-059>065-072>075-084-085-099-261100-
GREENE IL-MACOUPIN IL-MONTGOMERY IL-BOND IL-FAYETTE IL-CLINTON IL-
MARION IL-WASHINGTON IL-RANDOLPH IL-ADAMS IL-BROWN IL-PIKE IL-
CALHOUN IL-JERSEY IL-MADISON IL-ST. CLAIR IL-MONROE IL-KNOX MO-
LEWIS MO-SHELBY MO-MARION MO-MONROE MO-RALLS MO-PIKE MO-BOONE MO-
AUDRAIN MO-MONITEAU MO-COLE MO-OSAGE MO-CALLAWAY MO-MONTGOMERY MO-
LINCOLN MO-GASCONADE MO-WARREN MO-ST. CHARLES MO-FRANKLIN MO-
ST. LOUIS MO-ST. LOUIS CITY MO-JEFFERSON MO-CRAWFORD MO-
WASHINGTON MO-ST. FRANCOIS MO-STE. GENEVIEVE MO-IRON MO-
MADISON MO-REYNOLDS MO-
557 AM CDT SAT JUL 25 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN AND
CENTRAL MISSOURI AS WELL AS WEST CENTRAL AND SOUTHWEST ILLINOIS.

.DAY ONE...TODAY AND TONIGHT

SEVERAL ROUNDS OF THUNDERSTORMS ARE EXPECTED ACROSS THE REGION
TODAY AND TONIGHT. SOME OF THESE STORMS WILL BE STRONG TO
SEVERE...WITH THE MOST INTENSE STORMS PRODUCING HAIL AND STRONG
WINDS. HEAVY RAIN CAN ALSO BE EXPECTED.

HEAT INDEX VALUES OF AROUND 105 DEGREES ARE EXPECTED OVER PARTS OF
CENTRAL AND SOUTHEAST MISSOURI THIS AFTERNOON AND EARLY THIS
EVENING...AND A HEAT ADVISORY IS IN EFFECT FOR THESE AREAS. PLEASE
SEE THE HEAT ADVISORY PRODUCT FOR ADDITIONAL DETAILS.

MAJOR FLOODING IS ONGOING ALONG THE ILLINOIS RIVER FROM LA GRANGE
TO MEREDOSIA.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

THUNDERSTORMS ARE LIKELY OVER PARTS OF THE AREA SUNDAY
MORNING...WITH ADDITIONAL CHANCES FOR STORMS SUNDAY AFTERNOON INTO
SUNDAY NIGHT. SOME STRONG TO SEVERE STORMS ARE POSSIBLE. HEAVY
RAIN WILL ALSO REMAIN A POSSIBILITY...ESPECIALLY SUNDAY MORNING.

THERE IS A SLIGHT CHANCE FOR THUNDERSTORMS FOR MONDAY THROUGH
TUESDAY NIGHT....PRIMARILY ALONG AND EAST OF THE MISSISSIPPI
RIVER. A COLD FRONT WILL MOVE THROUGH THE REGION WEDNESDAY NIGHT
AND THURSDAY BRINGING A CHANCE FOR STORMS TO MUCH OF THE AREA.

HEAT INDEX READINGS OF 100 TO 105 WILL BE POSSIBLE ACROSS MUCH OF
THE AREA SUNDAY AND MONDAY...WITH READINGS POSSIBLY REACHING 110
DEGREES IN A FEW LOCATIONS BY TUESDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NECESSARY TODAY AND TONIGHT.

TRUETT

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 25, 2:16 AM CDTSpecial Weather StatementLSXAudrain, Boone, Monroe, Shelby44 min
Jul 25, 4:31 AM CDTFlash Flood WarningLSXMoniteau6 hr
Jul 25, 4:09 PM CDTFlash Flood WatchLSXAudrain, Boone, Callaway, Cole, Knox, Lewis and 8 more20 hr

Nearby

Heat Advisories in Missouri, 2015Every heat advisory 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.