Alert archive / Missouri / Areal Flood Advisories in 2011
Areal Flood Advisory 13, NWS St. Louis, MO
NWS St. Louis, MO issued this areal flood advisory at May 20, 2011, 5:35 PM CDT for Cole County, Missouri. It was in force for 4 hr.
The area
The counties it named.
The facts
- Issued
- May 20, 2011, 5:35 PM CDT (22:35 UTC)
- Expired
- May 20, 2011, 10:00 PM CDT
- In force
- 4 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
County Cole County, MO
The radar
The St Louis radar (KLSX), 141 km from the middle of the area, began a volume at 22:35 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
Springfield, MO (KSGF), launched 12:00Z, 10.6 hours before the alert went out and 223 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
- 537 J/kg
- Mixed-layer CIN
- -280 J/kg
- Mixed-layer LCL
- 940 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 222 m²/s²
- 0-3 km storm-relative helicity
- 161 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.6
What forecasters said that day
The local office's own words before this areal flood 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 areal flood advisory went out at May 20, 3:55 PM CDT, 1 hour 40 minutes earlier.
Area forecast discussion, May 20, 3:55 PM CDT, 1 hour 40 minutes before
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</html>Hazardous weather outlook, May 20, 4:01 PM CDT, 1 hour 34 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 401 PM CDT FRI MAY 20 2011 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-211130- 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- 401 PM CDT FRI MAY 20 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN AND CENTRAL MISSOURI AS WELL AS WEST CENTRAL AND SOUTHWEST ILLINOIS. .DAY ONE...TONIGHT THUNDERSTORMS ARE EXPECTED ACROSS THE AREA TONIGHT. SOME OF THE STORMS COULD PRODUCE LOCALLY HEAVY RAINFALL. A FEW STORMS ACROSS SOUTHEAST MISSOURI AND SOUTHWEST ILLINOIS COULD BE SEVERE AND CAPABLE OF PRODUCING HAIL AND DAMAGING WIND GUSTS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THUNDERSTORMS ARE LIKELY ON SATURDAY. SOME OF THE STORMS COULD BE STRONG TO SEVERE AND CAPABLE OF PRODUCING LARGE HAIL AND DAMAGING WIND GUSTS. THERE IS A CHANCE FOR THUNDERSTORMS FOR MUCH OF THE PERIOD FROM SATURDAY NIGHT THROUGH WEDNESDAY NIGHT. SOME OF THE STORMS ON SUNDAY AFTERNOON AND EVENING MAY BE STRONG TO SEVERE. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE ASKED TO REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE IN ST. LOUIS. KANOFSKY
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 4:09 AM CDT | River Flood Warning | LSX | Osage | 33 hr |
| May 20, 10:55 AM CDT | River Flood Warning | LSX | Callaway, Osage | 104 days |
| May 20, 10:55 AM CDT | River Flood Warning | LSX | Gasconade, Montgomery | 106 days |
| May 20, 10:55 AM CDT | River Flood Warning | LSX | Gasconade, Montgomery | 102 days |
| May 20, 1:18 PM CDT | Flash Flood Warning | LSX | Moniteau | 4 hr |
| May 20, 4:56 PM CDT | Flash Flood Warning | LSX | Moniteau | 5 hr |
Nearby
Areal Flood Advisories in Missouri, 2011Every areal flood advisory in 2011
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.